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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"
Per Lidenb97bf3f2006-01-02 19:04:38 +010046
Ying Xue796c75d2013-06-17 10:54:48 -040047#include <linux/pkt_sched.h>
48
Jon Paul Maloy38206d52015-11-19 14:30:46 -050049struct tipc_stats {
50 u32 sent_info; /* used in counting # sent packets */
51 u32 recv_info; /* used in counting # recv'd packets */
52 u32 sent_states;
53 u32 recv_states;
54 u32 sent_probes;
55 u32 recv_probes;
56 u32 sent_nacks;
57 u32 recv_nacks;
58 u32 sent_acks;
59 u32 sent_bundled;
60 u32 sent_bundles;
61 u32 recv_bundled;
62 u32 recv_bundles;
63 u32 retransmitted;
64 u32 sent_fragmented;
65 u32 sent_fragments;
66 u32 recv_fragmented;
67 u32 recv_fragments;
68 u32 link_congs; /* # port sends blocked by congestion */
69 u32 deferred_recv;
70 u32 duplicates;
71 u32 max_queue_sz; /* send queue size high water mark */
72 u32 accu_queue_sz; /* used for send queue size profiling */
73 u32 queue_sz_counts; /* used for send queue size profiling */
74 u32 msg_length_counts; /* used for message length profiling */
75 u32 msg_lengths_total; /* used for message length profiling */
76 u32 msg_length_profile[7]; /* used for msg. length profiling */
77};
78
79/**
80 * struct tipc_link - TIPC link data structure
81 * @addr: network address of link's peer node
82 * @name: link name character string
83 * @media_addr: media address to use when sending messages over link
84 * @timer: link timer
85 * @net: pointer to namespace struct
86 * @refcnt: reference counter for permanent references (owner node & timer)
87 * @peer_session: link session # being used by peer end of link
88 * @peer_bearer_id: bearer id used by link's peer endpoint
89 * @bearer_id: local bearer id used by link
90 * @tolerance: minimum link continuity loss needed to reset link [in ms]
Jon Paul Maloy38206d52015-11-19 14:30:46 -050091 * @abort_limit: # of unacknowledged continuity probes needed to reset link
92 * @state: current state of link FSM
93 * @peer_caps: bitmap describing capabilities of peer node
94 * @silent_intv_cnt: # of timer intervals without any reception from peer
95 * @proto_msg: template for control messages generated by link
96 * @pmsg: convenience pointer to "proto_msg" field
97 * @priority: current link priority
98 * @net_plane: current link network plane ('A' through 'H')
Jon Paul Maloy35c55c92016-06-13 20:46:22 -040099 * @mon_state: cookie with information needed by link monitor
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500100 * @backlog_limit: backlog queue congestion thresholds (indexed by importance)
101 * @exp_msg_count: # of tunnelled messages expected during link changeover
102 * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset
103 * @mtu: current maximum packet size for this link
104 * @advertised_mtu: advertised own mtu when link is being established
105 * @transmitq: queue for sent, non-acked messages
106 * @backlogq: queue for messages waiting to be sent
107 * @snt_nxt: next sequence number to use for outbound messages
108 * @last_retransmitted: sequence number of most recently retransmitted message
109 * @stale_count: # of identical retransmit requests made by peer
110 * @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
123 */
124struct tipc_link {
125 u32 addr;
126 char name[TIPC_MAX_LINK_NAME];
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500127 struct net *net;
128
129 /* Management and link supervision data */
130 u32 peer_session;
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500131 u32 session;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500132 u32 peer_bearer_id;
133 u32 bearer_id;
134 u32 tolerance;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500135 u32 abort_limit;
136 u32 state;
137 u16 peer_caps;
138 bool active;
139 u32 silent_intv_cnt;
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500140 char if_name[TIPC_MAX_IF_NAME];
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500141 u32 priority;
142 char net_plane;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -0400143 struct tipc_mon_state mon_state;
Jon Paul Maloy88e8ac72016-04-15 13:33:04 -0400144 u16 rst_cnt;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500145
146 /* Failover/synch */
147 u16 drop_point;
148 struct sk_buff *failover_reasm_skb;
149
150 /* Max packet negotiation */
151 u16 mtu;
152 u16 advertised_mtu;
153
154 /* Sending */
155 struct sk_buff_head transmq;
156 struct sk_buff_head backlogq;
157 struct {
158 u16 len;
159 u16 limit;
160 } backlog[5];
161 u16 snd_nxt;
162 u16 last_retransm;
163 u16 window;
164 u32 stale_count;
165
166 /* Reception */
167 u16 rcv_nxt;
168 u32 rcv_unacked;
169 struct sk_buff_head deferdq;
170 struct sk_buff_head *inputq;
171 struct sk_buff_head *namedq;
172
173 /* Congestion handling */
174 struct sk_buff_head wakeupq;
175
176 /* Fragmentation/reassembly */
177 struct sk_buff *reasm_buf;
178
179 /* Broadcast */
180 u16 ackers;
181 u16 acked;
182 struct tipc_link *bc_rcvlink;
183 struct tipc_link *bc_sndlink;
Jon Paul Maloy7c4a54b2016-09-01 13:52:50 -0400184 unsigned long prev_retr;
185 u16 prev_from;
186 u16 prev_to;
187 u8 nack_state;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500188 bool bc_peer_is_up;
189
190 /* Statistics */
191 struct tipc_stats stats;
192};
193
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400194/*
195 * Error message prefixes
196 */
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400197static const char *link_co_err = "Link tunneling error, ";
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400198static const char *link_rst_msg = "Resetting link ";
Richard Alpe7be57fc2014-11-20 10:29:12 +0100199
Jon Paul Maloy52666982015-10-22 08:51:41 -0400200/* Send states for broadcast NACKs
201 */
202enum {
203 BC_NACK_SND_CONDITIONAL,
204 BC_NACK_SND_UNCONDITIONAL,
205 BC_NACK_SND_SUPPRESS,
206};
207
Jon Paul Maloy7c4a54b2016-09-01 13:52:50 -0400208#define TIPC_BC_RETR_LIMIT 10 /* [ms] */
209
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900210/*
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400211 * Interval between NACKs when packets arrive out of order
212 */
213#define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2)
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500214
215/* Wildcard value for link session numbers. When it is known that
216 * peer endpoint is down, any session number must be accepted.
Allan Stephensa686e682008-06-04 17:29:39 -0700217 */
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500218#define ANY_SESSION 0x10000
Allan Stephensa686e682008-06-04 17:29:39 -0700219
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400220/* Link FSM states:
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400221 */
222enum {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400223 LINK_ESTABLISHED = 0xe,
224 LINK_ESTABLISHING = 0xe << 4,
225 LINK_RESET = 0x1 << 8,
226 LINK_RESETTING = 0x2 << 12,
227 LINK_PEER_RESET = 0xd << 16,
228 LINK_FAILINGOVER = 0xf << 20,
229 LINK_SYNCHING = 0xc << 24
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400230};
231
232/* Link FSM state checking routines
233 */
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400234static int link_is_up(struct tipc_link *l)
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400235{
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400236 return l->state & (LINK_ESTABLISHED | LINK_SYNCHING);
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400237}
238
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400239static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
240 struct sk_buff_head *xmitq);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -0400241static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
242 u16 rcvgap, int tolerance, int priority,
243 struct sk_buff_head *xmitq);
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500244static void link_print(struct tipc_link *l, const char *str);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400245static void tipc_link_build_nack_msg(struct tipc_link *l,
246 struct sk_buff_head *xmitq);
247static void tipc_link_build_bc_init_msg(struct tipc_link *l,
248 struct sk_buff_head *xmitq);
249static bool tipc_link_release_pkts(struct tipc_link *l, u16 to);
Jon Paul Maloy8b4ed862015-03-25 12:07:26 -0400250
Per Lidenb97bf3f2006-01-02 19:04:38 +0100251/*
Sam Ravnborg05790c62006-03-20 22:37:04 -0800252 * Simple non-static link routines (i.e. referenced outside this file)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100253 */
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400254bool tipc_link_is_up(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100255{
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400256 return link_is_up(l);
257}
258
Jon Paul Maloyc8199302015-10-15 14:52:46 -0400259bool tipc_link_peer_is_down(struct tipc_link *l)
260{
261 return l->state == LINK_PEER_RESET;
262}
263
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400264bool tipc_link_is_reset(struct tipc_link *l)
265{
266 return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING);
267}
268
Jon Paul Maloy73f646c2015-10-15 14:52:44 -0400269bool tipc_link_is_establishing(struct tipc_link *l)
270{
271 return l->state == LINK_ESTABLISHING;
272}
273
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400274bool tipc_link_is_synching(struct tipc_link *l)
275{
276 return l->state == LINK_SYNCHING;
277}
278
279bool tipc_link_is_failingover(struct tipc_link *l)
280{
281 return l->state == LINK_FAILINGOVER;
282}
283
284bool tipc_link_is_blocked(struct tipc_link *l)
285{
286 return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100287}
288
Wu Fengguang742e0382015-10-24 22:56:01 +0800289static bool link_is_bc_sndlink(struct tipc_link *l)
Jon Paul Maloy52666982015-10-22 08:51:41 -0400290{
291 return !l->bc_sndlink;
292}
293
Wu Fengguang742e0382015-10-24 22:56:01 +0800294static bool link_is_bc_rcvlink(struct tipc_link *l)
Jon Paul Maloy52666982015-10-22 08:51:41 -0400295{
296 return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l));
297}
298
Jon Paul Maloy9d13ec62015-07-16 16:54:19 -0400299int tipc_link_is_active(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100300{
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400301 return l->active;
302}
Jon Paul Maloy9d13ec62015-07-16 16:54:19 -0400303
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400304void tipc_link_set_active(struct tipc_link *l, bool active)
305{
306 l->active = active;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100307}
308
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500309u32 tipc_link_id(struct tipc_link *l)
310{
311 return l->peer_bearer_id << 16 | l->bearer_id;
312}
313
314int tipc_link_window(struct tipc_link *l)
315{
316 return l->window;
317}
318
319int tipc_link_prio(struct tipc_link *l)
320{
321 return l->priority;
322}
323
324unsigned long tipc_link_tolerance(struct tipc_link *l)
325{
326 return l->tolerance;
327}
328
329struct sk_buff_head *tipc_link_inputq(struct tipc_link *l)
330{
331 return l->inputq;
332}
333
334char tipc_link_plane(struct tipc_link *l)
335{
336 return l->net_plane;
337}
338
Jon Paul Maloy52666982015-10-22 08:51:41 -0400339void tipc_link_add_bc_peer(struct tipc_link *snd_l,
340 struct tipc_link *uc_l,
341 struct sk_buff_head *xmitq)
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400342{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400343 struct tipc_link *rcv_l = uc_l->bc_rcvlink;
344
345 snd_l->ackers++;
346 rcv_l->acked = snd_l->snd_nxt - 1;
Jon Paul Maloy9a650832015-11-19 14:12:50 -0500347 snd_l->state = LINK_ESTABLISHED;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400348 tipc_link_build_bc_init_msg(uc_l, xmitq);
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400349}
350
Jon Paul Maloy52666982015-10-22 08:51:41 -0400351void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
352 struct tipc_link *rcv_l,
353 struct sk_buff_head *xmitq)
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400354{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400355 u16 ack = snd_l->snd_nxt - 1;
356
357 snd_l->ackers--;
Jon Paul Maloya71eb722016-07-11 16:08:36 -0400358 rcv_l->bc_peer_is_up = true;
359 rcv_l->state = LINK_ESTABLISHED;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400360 tipc_link_bc_ack_rcv(rcv_l, ack, xmitq);
361 tipc_link_reset(rcv_l);
362 rcv_l->state = LINK_RESET;
363 if (!snd_l->ackers) {
364 tipc_link_reset(snd_l);
Jon Paul Maloy9a650832015-11-19 14:12:50 -0500365 snd_l->state = LINK_RESET;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400366 __skb_queue_purge(xmitq);
367 }
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400368}
369
370int tipc_link_bc_peers(struct tipc_link *l)
371{
372 return l->ackers;
373}
374
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -0400375u16 link_bc_rcv_gap(struct tipc_link *l)
376{
377 struct sk_buff *skb = skb_peek(&l->deferdq);
378 u16 gap = 0;
379
380 if (more(l->snd_nxt, l->rcv_nxt))
381 gap = l->snd_nxt - l->rcv_nxt;
382 if (skb)
383 gap = buf_seqno(skb) - l->rcv_nxt;
384 return gap;
385}
386
Jon Paul Maloy959e1782015-10-22 08:51:43 -0400387void tipc_link_set_mtu(struct tipc_link *l, int mtu)
388{
389 l->mtu = mtu;
390}
391
392int tipc_link_mtu(struct tipc_link *l)
393{
394 return l->mtu;
395}
396
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500397u16 tipc_link_rcv_nxt(struct tipc_link *l)
398{
399 return l->rcv_nxt;
400}
401
402u16 tipc_link_acked(struct tipc_link *l)
403{
404 return l->acked;
405}
406
407char *tipc_link_name(struct tipc_link *l)
408{
409 return l->name;
410}
411
Per Lidenb97bf3f2006-01-02 19:04:38 +0100412/**
Per Liden4323add2006-01-18 00:38:21 +0100413 * tipc_link_create - create a new link
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400414 * @n: pointer to associated node
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400415 * @if_name: associated interface name
416 * @bearer_id: id (index) of associated bearer
417 * @tolerance: link tolerance to be used by link
418 * @net_plane: network plane (A,B,c..) this link belongs to
419 * @mtu: mtu to be advertised by link
420 * @priority: priority to be used by link
421 * @window: send window to be used by link
422 * @session: session to be used by link
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400423 * @ownnode: identity of own node
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400424 * @peer: node id of peer node
Jon Paul Maloyfd556f22015-10-22 08:51:40 -0400425 * @peer_caps: bitmap describing peer node capabilities
Jon Paul Maloy52666982015-10-22 08:51:41 -0400426 * @bc_sndlink: the namespace global link used for broadcast sending
427 * @bc_rcvlink: the peer specific link used for broadcast reception
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400428 * @inputq: queue to put messages ready for delivery
429 * @namedq: queue to put binding table update messages ready for delivery
430 * @link: return value, pointer to put the created link
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900431 *
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400432 * Returns true if link was created, otherwise false
Per Lidenb97bf3f2006-01-02 19:04:38 +0100433 */
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400434bool tipc_link_create(struct net *net, char *if_name, int bearer_id,
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400435 int tolerance, char net_plane, u32 mtu, int priority,
436 int window, u32 session, u32 ownnode, u32 peer,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400437 u16 peer_caps,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400438 struct tipc_link *bc_sndlink,
439 struct tipc_link *bc_rcvlink,
440 struct sk_buff_head *inputq,
441 struct sk_buff_head *namedq,
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400442 struct tipc_link **link)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100443{
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400444 struct tipc_link *l;
Allan Stephens37b9c082011-02-28 11:32:27 -0500445
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400446 l = kzalloc(sizeof(*l), GFP_ATOMIC);
447 if (!l)
448 return false;
449 *link = l;
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500450 l->session = session;
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400451
452 /* Note: peer i/f name is completed by reset/activate message */
453 sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
454 tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode),
455 if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500456 strcpy(l->if_name, if_name);
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400457 l->addr = peer;
Jon Paul Maloyfd556f22015-10-22 08:51:40 -0400458 l->peer_caps = peer_caps;
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400459 l->net = net;
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500460 l->peer_session = ANY_SESSION;
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400461 l->bearer_id = bearer_id;
462 l->tolerance = tolerance;
463 l->net_plane = net_plane;
464 l->advertised_mtu = mtu;
465 l->mtu = mtu;
466 l->priority = priority;
467 tipc_link_set_queue_limits(l, window);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400468 l->ackers = 1;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400469 l->bc_sndlink = bc_sndlink;
470 l->bc_rcvlink = bc_rcvlink;
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400471 l->inputq = inputq;
472 l->namedq = namedq;
473 l->state = LINK_RESETTING;
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400474 __skb_queue_head_init(&l->transmq);
475 __skb_queue_head_init(&l->backlogq);
476 __skb_queue_head_init(&l->deferdq);
477 skb_queue_head_init(&l->wakeupq);
478 skb_queue_head_init(l->inputq);
479 return true;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100480}
481
Jon Paul Maloy32301902015-10-22 08:51:37 -0400482/**
483 * tipc_link_bc_create - create new link to be used for broadcast
484 * @n: pointer to associated node
485 * @mtu: mtu to be used
486 * @window: send window to be used
487 * @inputq: queue to put messages ready for delivery
488 * @namedq: queue to put binding table update messages ready for delivery
489 * @link: return value, pointer to put the created link
490 *
491 * Returns true if link was created, otherwise false
492 */
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400493bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400494 int mtu, int window, u16 peer_caps,
Jon Paul Maloy32301902015-10-22 08:51:37 -0400495 struct sk_buff_head *inputq,
496 struct sk_buff_head *namedq,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400497 struct tipc_link *bc_sndlink,
Jon Paul Maloy32301902015-10-22 08:51:37 -0400498 struct tipc_link **link)
499{
500 struct tipc_link *l;
501
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400502 if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window,
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400503 0, ownnode, peer, peer_caps, bc_sndlink,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400504 NULL, inputq, namedq, link))
Jon Paul Maloy32301902015-10-22 08:51:37 -0400505 return false;
506
507 l = *link;
508 strcpy(l->name, tipc_bclink_name);
509 tipc_link_reset(l);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400510 l->state = LINK_RESET;
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400511 l->ackers = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400512 l->bc_rcvlink = l;
513
514 /* Broadcast send link is always up */
515 if (link_is_bc_sndlink(l))
516 l->state = LINK_ESTABLISHED;
517
Jon Paul Maloy32301902015-10-22 08:51:37 -0400518 return true;
519}
520
Per Lidenb97bf3f2006-01-02 19:04:38 +0100521/**
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400522 * tipc_link_fsm_evt - link finite state machine
523 * @l: pointer to link
524 * @evt: state machine event to be processed
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400525 */
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400526int tipc_link_fsm_evt(struct tipc_link *l, int evt)
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400527{
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400528 int rc = 0;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400529
530 switch (l->state) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400531 case LINK_RESETTING:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400532 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400533 case LINK_PEER_RESET_EVT:
534 l->state = LINK_PEER_RESET;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400535 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400536 case LINK_RESET_EVT:
537 l->state = LINK_RESET;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400538 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400539 case LINK_FAILURE_EVT:
540 case LINK_FAILOVER_BEGIN_EVT:
541 case LINK_ESTABLISH_EVT:
542 case LINK_FAILOVER_END_EVT:
543 case LINK_SYNCH_BEGIN_EVT:
544 case LINK_SYNCH_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400545 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400546 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400547 }
548 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400549 case LINK_RESET:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400550 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400551 case LINK_PEER_RESET_EVT:
552 l->state = LINK_ESTABLISHING;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400553 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400554 case LINK_FAILOVER_BEGIN_EVT:
555 l->state = LINK_FAILINGOVER;
556 case LINK_FAILURE_EVT:
557 case LINK_RESET_EVT:
558 case LINK_ESTABLISH_EVT:
559 case LINK_FAILOVER_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400560 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400561 case LINK_SYNCH_BEGIN_EVT:
562 case LINK_SYNCH_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400563 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400564 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400565 }
566 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400567 case LINK_PEER_RESET:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400568 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400569 case LINK_RESET_EVT:
570 l->state = LINK_ESTABLISHING;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400571 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400572 case LINK_PEER_RESET_EVT:
573 case LINK_ESTABLISH_EVT:
574 case LINK_FAILURE_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400575 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400576 case LINK_SYNCH_BEGIN_EVT:
577 case LINK_SYNCH_END_EVT:
578 case LINK_FAILOVER_BEGIN_EVT:
579 case LINK_FAILOVER_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400580 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400581 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400582 }
583 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400584 case LINK_FAILINGOVER:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400585 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400586 case LINK_FAILOVER_END_EVT:
587 l->state = LINK_RESET;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400588 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400589 case LINK_PEER_RESET_EVT:
590 case LINK_RESET_EVT:
591 case LINK_ESTABLISH_EVT:
592 case LINK_FAILURE_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400593 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400594 case LINK_FAILOVER_BEGIN_EVT:
595 case LINK_SYNCH_BEGIN_EVT:
596 case LINK_SYNCH_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400597 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400598 goto illegal_evt;
599 }
600 break;
601 case LINK_ESTABLISHING:
602 switch (evt) {
603 case LINK_ESTABLISH_EVT:
604 l->state = LINK_ESTABLISHED;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400605 break;
606 case LINK_FAILOVER_BEGIN_EVT:
607 l->state = LINK_FAILINGOVER;
608 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400609 case LINK_RESET_EVT:
Jon Paul Maloy73f646c2015-10-15 14:52:44 -0400610 l->state = LINK_RESET;
611 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400612 case LINK_FAILURE_EVT:
Jon Paul Maloy73f646c2015-10-15 14:52:44 -0400613 case LINK_PEER_RESET_EVT:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400614 case LINK_SYNCH_BEGIN_EVT:
615 case LINK_FAILOVER_END_EVT:
616 break;
617 case LINK_SYNCH_END_EVT:
618 default:
619 goto illegal_evt;
620 }
621 break;
622 case LINK_ESTABLISHED:
623 switch (evt) {
624 case LINK_PEER_RESET_EVT:
625 l->state = LINK_PEER_RESET;
626 rc |= TIPC_LINK_DOWN_EVT;
627 break;
628 case LINK_FAILURE_EVT:
629 l->state = LINK_RESETTING;
630 rc |= TIPC_LINK_DOWN_EVT;
631 break;
632 case LINK_RESET_EVT:
633 l->state = LINK_RESET;
634 break;
635 case LINK_ESTABLISH_EVT:
Jon Paul Maloy5ae2f8e2015-08-20 02:12:55 -0400636 case LINK_SYNCH_END_EVT:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400637 break;
638 case LINK_SYNCH_BEGIN_EVT:
639 l->state = LINK_SYNCHING;
640 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400641 case LINK_FAILOVER_BEGIN_EVT:
642 case LINK_FAILOVER_END_EVT:
643 default:
644 goto illegal_evt;
645 }
646 break;
647 case LINK_SYNCHING:
648 switch (evt) {
649 case LINK_PEER_RESET_EVT:
650 l->state = LINK_PEER_RESET;
651 rc |= TIPC_LINK_DOWN_EVT;
652 break;
653 case LINK_FAILURE_EVT:
654 l->state = LINK_RESETTING;
655 rc |= TIPC_LINK_DOWN_EVT;
656 break;
657 case LINK_RESET_EVT:
658 l->state = LINK_RESET;
659 break;
660 case LINK_ESTABLISH_EVT:
661 case LINK_SYNCH_BEGIN_EVT:
662 break;
663 case LINK_SYNCH_END_EVT:
664 l->state = LINK_ESTABLISHED;
665 break;
666 case LINK_FAILOVER_BEGIN_EVT:
667 case LINK_FAILOVER_END_EVT:
668 default:
669 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400670 }
671 break;
672 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400673 pr_err("Unknown FSM state %x in %s\n", l->state, l->name);
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400674 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400675 return rc;
676illegal_evt:
677 pr_err("Illegal FSM event %x in state %x on link %s\n",
678 evt, l->state, l->name);
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400679 return rc;
680}
681
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400682/* link_profile_stats - update statistical profiling of traffic
683 */
684static void link_profile_stats(struct tipc_link *l)
685{
686 struct sk_buff *skb;
687 struct tipc_msg *msg;
688 int length;
689
690 /* Update counters used in statistical profiling of send traffic */
691 l->stats.accu_queue_sz += skb_queue_len(&l->transmq);
692 l->stats.queue_sz_counts++;
693
694 skb = skb_peek(&l->transmq);
695 if (!skb)
696 return;
697 msg = buf_msg(skb);
698 length = msg_size(msg);
699
700 if (msg_user(msg) == MSG_FRAGMENTER) {
701 if (msg_type(msg) != FIRST_FRAGMENT)
702 return;
703 length = msg_size(msg_get_wrapped(msg));
704 }
705 l->stats.msg_lengths_total += length;
706 l->stats.msg_length_counts++;
707 if (length <= 64)
708 l->stats.msg_length_profile[0]++;
709 else if (length <= 256)
710 l->stats.msg_length_profile[1]++;
711 else if (length <= 1024)
712 l->stats.msg_length_profile[2]++;
713 else if (length <= 4096)
714 l->stats.msg_length_profile[3]++;
715 else if (length <= 16384)
716 l->stats.msg_length_profile[4]++;
717 else if (length <= 32768)
718 l->stats.msg_length_profile[5]++;
719 else
720 l->stats.msg_length_profile[6]++;
721}
722
723/* tipc_link_timeout - perform periodic task as instructed from node timeout
724 */
725int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
726{
Ying Xuec91522f2016-06-15 14:11:31 +0800727 int mtyp = 0;
728 int rc = 0;
Jon Paul Maloy42b18f62016-04-15 13:33:05 -0400729 bool state = false;
730 bool probe = false;
731 bool setup = false;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400732 u16 bc_snt = l->bc_sndlink->snd_nxt - 1;
733 u16 bc_acked = l->bc_rcvlink->acked;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -0400734 struct tipc_mon_state *mstate = &l->mon_state;
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400735
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400736 switch (l->state) {
737 case LINK_ESTABLISHED:
738 case LINK_SYNCHING:
Jon Paul Maloy42b18f62016-04-15 13:33:05 -0400739 mtyp = STATE_MSG;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -0400740 link_profile_stats(l);
741 tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id);
742 if (mstate->reset || (l->silent_intv_cnt > l->abort_limit))
743 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloy42b18f62016-04-15 13:33:05 -0400744 state = bc_acked != bc_snt;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -0400745 state |= l->bc_rcvlink->rcv_unacked;
746 state |= l->rcv_unacked;
747 state |= !skb_queue_empty(&l->transmq);
748 state |= !skb_queue_empty(&l->deferdq);
749 probe = mstate->probing;
750 probe |= l->silent_intv_cnt;
751 if (probe || mstate->monitoring)
752 l->silent_intv_cnt++;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400753 break;
754 case LINK_RESET:
Jon Paul Maloy42b18f62016-04-15 13:33:05 -0400755 setup = l->rst_cnt++ <= 4;
756 setup |= !(l->rst_cnt % 16);
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400757 mtyp = RESET_MSG;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400758 break;
759 case LINK_ESTABLISHING:
Jon Paul Maloy42b18f62016-04-15 13:33:05 -0400760 setup = true;
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400761 mtyp = ACTIVATE_MSG;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400762 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400763 case LINK_PEER_RESET:
Jon Paul Maloy598411d2015-07-30 18:24:23 -0400764 case LINK_RESETTING:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400765 case LINK_FAILINGOVER:
766 break;
767 default:
768 break;
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400769 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400770
Jon Paul Maloy42b18f62016-04-15 13:33:05 -0400771 if (state || probe || setup)
772 tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, xmitq);
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400773
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400774 return rc;
775}
776
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400777/**
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400778 * link_schedule_user - schedule a message sender for wakeup after congestion
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400779 * @link: congested link
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400780 * @list: message that was attempted sent
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400781 * Create pseudo msg to send back to user when congestion abates
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400782 * Does not consume buffer list
Per Lidenb97bf3f2006-01-02 19:04:38 +0100783 */
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400784static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100785{
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400786 struct tipc_msg *msg = buf_msg(skb_peek(list));
787 int imp = msg_importance(msg);
788 u32 oport = msg_origport(msg);
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500789 u32 addr = tipc_own_addr(link->net);
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400790 struct sk_buff *skb;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100791
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400792 /* This really cannot happen... */
793 if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) {
794 pr_warn("%s<%s>, send queue full", link_rst_msg, link->name);
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400795 return -ENOBUFS;
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400796 }
797 /* Non-blocking sender: */
798 if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending)
799 return -ELINKCONG;
800
801 /* Create and schedule wakeup pseudo message */
802 skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0,
803 addr, addr, oport, 0, 0);
804 if (!skb)
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400805 return -ENOBUFS;
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400806 TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list);
807 TIPC_SKB_CB(skb)->chain_imp = imp;
808 skb_queue_tail(&link->wakeupq, skb);
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400809 link->stats.link_congs++;
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400810 return -ELINKCONG;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100811}
812
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400813/**
814 * link_prepare_wakeup - prepare users for wakeup after congestion
815 * @link: congested link
816 * Move a number of waiting users, as permitted by available space in
817 * the send queue, from link wait queue to node wait queue for wakeup
818 */
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400819void link_prepare_wakeup(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100820{
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400821 int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,};
822 int imp, lim;
Ying Xue58d78b32014-11-26 11:41:51 +0800823 struct sk_buff *skb, *tmp;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100824
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400825 skb_queue_walk_safe(&l->wakeupq, skb, tmp) {
826 imp = TIPC_SKB_CB(skb)->chain_imp;
Jon Paul Maloy5a0950c2016-08-16 11:53:51 -0400827 lim = l->backlog[imp].limit;
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400828 pnd[imp] += TIPC_SKB_CB(skb)->chain_sz;
829 if ((pnd[imp] + l->backlog[imp].len) >= lim)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100830 break;
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400831 skb_unlink(skb, &l->wakeupq);
Jon Paul Maloyd39bbd42015-07-16 16:54:21 -0400832 skb_queue_tail(l->inputq, skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100833 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100834}
835
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400836void tipc_link_reset(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100837{
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500838 l->peer_session = ANY_SESSION;
839 l->session++;
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400840 l->mtu = l->advertised_mtu;
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400841 __skb_queue_purge(&l->transmq);
842 __skb_queue_purge(&l->deferdq);
Jon Paul Maloy23d83352015-07-30 18:24:24 -0400843 skb_queue_splice_init(&l->wakeupq, l->inputq);
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400844 __skb_queue_purge(&l->backlogq);
845 l->backlog[TIPC_LOW_IMPORTANCE].len = 0;
846 l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0;
847 l->backlog[TIPC_HIGH_IMPORTANCE].len = 0;
848 l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0;
849 l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400850 kfree_skb(l->reasm_buf);
851 kfree_skb(l->failover_reasm_skb);
852 l->reasm_buf = NULL;
853 l->failover_reasm_skb = NULL;
854 l->rcv_unacked = 0;
855 l->snd_nxt = 1;
856 l->rcv_nxt = 1;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400857 l->acked = 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400858 l->silent_intv_cnt = 0;
Jon Paul Maloy88e8ac72016-04-15 13:33:04 -0400859 l->rst_cnt = 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400860 l->stats.recv_info = 0;
861 l->stale_count = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400862 l->bc_peer_is_up = false;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -0400863 memset(&l->mon_state, 0, sizeof(l->mon_state));
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500864 tipc_link_reset_stats(l);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100865}
866
Per Lidenb97bf3f2006-01-02 19:04:38 +0100867/**
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400868 * tipc_link_xmit(): enqueue buffer list according to queue situation
869 * @link: link to use
870 * @list: chain of buffers containing message
871 * @xmitq: returned list of packets to be sent by caller
872 *
873 * Consumes the buffer chain, except when returning -ELINKCONG,
874 * since the caller then may want to make more send attempts.
875 * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
876 * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
877 */
878int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
879 struct sk_buff_head *xmitq)
880{
881 struct tipc_msg *hdr = buf_msg(skb_peek(list));
882 unsigned int maxwin = l->window;
883 unsigned int i, imp = msg_importance(hdr);
884 unsigned int mtu = l->mtu;
885 u16 ack = l->rcv_nxt - 1;
886 u16 seqno = l->snd_nxt;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400887 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400888 struct sk_buff_head *transmq = &l->transmq;
889 struct sk_buff_head *backlogq = &l->backlogq;
890 struct sk_buff *skb, *_skb, *bskb;
891
892 /* Match msg importance against this and all higher backlog limits: */
Jon Paul Maloy5a0950c2016-08-16 11:53:51 -0400893 if (!skb_queue_empty(backlogq)) {
894 for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) {
895 if (unlikely(l->backlog[i].len >= l->backlog[i].limit))
896 return link_schedule_user(l, list);
897 }
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400898 }
Richard Alpe4952cd32016-02-11 10:43:15 +0100899 if (unlikely(msg_size(hdr) > mtu)) {
900 skb_queue_purge(list);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400901 return -EMSGSIZE;
Richard Alpe4952cd32016-02-11 10:43:15 +0100902 }
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400903
904 /* Prepare each packet for sending, and add to relevant queue: */
905 while (skb_queue_len(list)) {
906 skb = skb_peek(list);
907 hdr = buf_msg(skb);
908 msg_set_seqno(hdr, seqno);
909 msg_set_ack(hdr, ack);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400910 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400911
912 if (likely(skb_queue_len(transmq) < maxwin)) {
913 _skb = skb_clone(skb, GFP_ATOMIC);
Richard Alpe4952cd32016-02-11 10:43:15 +0100914 if (!_skb) {
915 skb_queue_purge(list);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400916 return -ENOBUFS;
Richard Alpe4952cd32016-02-11 10:43:15 +0100917 }
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400918 __skb_dequeue(list);
919 __skb_queue_tail(transmq, skb);
920 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400921 TIPC_SKB_CB(skb)->ackers = l->ackers;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400922 l->rcv_unacked = 0;
923 seqno++;
924 continue;
925 }
926 if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) {
927 kfree_skb(__skb_dequeue(list));
928 l->stats.sent_bundled++;
929 continue;
930 }
931 if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) {
932 kfree_skb(__skb_dequeue(list));
933 __skb_queue_tail(backlogq, bskb);
934 l->backlog[msg_importance(buf_msg(bskb))].len++;
935 l->stats.sent_bundled++;
936 l->stats.sent_bundles++;
937 continue;
938 }
939 l->backlog[imp].len += skb_queue_len(list);
940 skb_queue_splice_tail_init(list, backlogq);
941 }
942 l->snd_nxt = seqno;
943 return 0;
944}
945
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400946void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq)
947{
948 struct sk_buff *skb, *_skb;
949 struct tipc_msg *hdr;
950 u16 seqno = l->snd_nxt;
951 u16 ack = l->rcv_nxt - 1;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400952 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400953
954 while (skb_queue_len(&l->transmq) < l->window) {
955 skb = skb_peek(&l->backlogq);
956 if (!skb)
957 break;
958 _skb = skb_clone(skb, GFP_ATOMIC);
959 if (!_skb)
960 break;
961 __skb_dequeue(&l->backlogq);
962 hdr = buf_msg(skb);
963 l->backlog[msg_importance(hdr)].len--;
964 __skb_queue_tail(&l->transmq, skb);
965 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400966 TIPC_SKB_CB(skb)->ackers = l->ackers;
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400967 msg_set_seqno(hdr, seqno);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400968 msg_set_ack(hdr, ack);
969 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400970 l->rcv_unacked = 0;
971 seqno++;
972 }
973 l->snd_nxt = seqno;
974}
975
Jon Paul Maloy52666982015-10-22 08:51:41 -0400976static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb)
Allan Stephensd356eeb2006-06-25 23:40:01 -0700977{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400978 struct tipc_msg *hdr = buf_msg(skb);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700979
Jon Paul Maloy52666982015-10-22 08:51:41 -0400980 pr_warn("Retransmission failure on link <%s>\n", l->name);
981 link_print(l, "Resetting link ");
982 pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
983 msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr));
984 pr_info("sqno %u, prev: %x, src: %x\n",
985 msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr));
Allan Stephensd356eeb2006-06-25 23:40:01 -0700986}
987
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400988int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to,
989 struct sk_buff_head *xmitq)
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400990{
991 struct sk_buff *_skb, *skb = skb_peek(&l->transmq);
992 struct tipc_msg *hdr;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400993 u16 ack = l->rcv_nxt - 1;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400994 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400995
996 if (!skb)
997 return 0;
998
999 /* Detect repeated retransmit failures on same packet */
1000 if (likely(l->last_retransm != buf_seqno(skb))) {
1001 l->last_retransm = buf_seqno(skb);
1002 l->stale_count = 1;
1003 } else if (++l->stale_count > 100) {
1004 link_retransmit_failure(l, skb);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001005 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001006 }
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001007
1008 /* Move forward to where retransmission should start */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001009 skb_queue_walk(&l->transmq, skb) {
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001010 if (!less(buf_seqno(skb), from))
1011 break;
1012 }
1013
1014 skb_queue_walk_from(&l->transmq, skb) {
1015 if (more(buf_seqno(skb), to))
1016 break;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001017 hdr = buf_msg(skb);
1018 _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC);
1019 if (!_skb)
1020 return 0;
1021 hdr = buf_msg(_skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001022 msg_set_ack(hdr, ack);
1023 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001024 _skb->priority = TC_PRIO_CONTROL;
1025 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001026 l->stats.retransmitted++;
1027 }
1028 return 0;
1029}
1030
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001031/* tipc_data_input - deliver data and name distr msgs to upper layer
Erik Hugne7ae934b2014-07-01 10:22:40 +02001032 *
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001033 * Consumes buffer if message is of right type
Erik Hugne7ae934b2014-07-01 10:22:40 +02001034 * Node lock must be held
1035 */
Jon Paul Maloy52666982015-10-22 08:51:41 -04001036static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb,
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001037 struct sk_buff_head *inputq)
Erik Hugne7ae934b2014-07-01 10:22:40 +02001038{
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001039 switch (msg_user(buf_msg(skb))) {
Erik Hugne7ae934b2014-07-01 10:22:40 +02001040 case TIPC_LOW_IMPORTANCE:
1041 case TIPC_MEDIUM_IMPORTANCE:
1042 case TIPC_HIGH_IMPORTANCE:
1043 case TIPC_CRITICAL_IMPORTANCE:
1044 case CONN_MANAGER:
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001045 skb_queue_tail(inputq, skb);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001046 return true;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001047 case NAME_DISTRIBUTOR:
Jon Paul Maloy52666982015-10-22 08:51:41 -04001048 l->bc_rcvlink->state = LINK_ESTABLISHED;
1049 skb_queue_tail(l->namedq, skb);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001050 return true;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001051 case MSG_BUNDLER:
Jon Paul Maloydff29b12015-04-02 09:33:01 -04001052 case TUNNEL_PROTOCOL:
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001053 case MSG_FRAGMENTER:
1054 case BCAST_PROTOCOL:
1055 return false;
1056 default:
1057 pr_warn("Dropping received illegal msg type\n");
1058 kfree_skb(skb);
1059 return false;
1060 };
1061}
1062
1063/* tipc_link_input - process packet that has passed link protocol check
1064 *
1065 * Consumes buffer
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001066 */
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001067static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,
1068 struct sk_buff_head *inputq)
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001069{
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001070 struct tipc_msg *hdr = buf_msg(skb);
1071 struct sk_buff **reasm_skb = &l->reasm_buf;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001072 struct sk_buff *iskb;
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001073 struct sk_buff_head tmpq;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001074 int usr = msg_user(hdr);
Jon Paul Maloy6144a992015-07-30 18:24:16 -04001075 int rc = 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001076 int pos = 0;
1077 int ipos = 0;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001078
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001079 if (unlikely(usr == TUNNEL_PROTOCOL)) {
1080 if (msg_type(hdr) == SYNCH_MSG) {
1081 __skb_queue_purge(&l->deferdq);
1082 goto drop;
Jon Paul Maloy8b4ed862015-03-25 12:07:26 -04001083 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001084 if (!tipc_msg_extract(skb, &iskb, &ipos))
1085 return rc;
1086 kfree_skb(skb);
1087 skb = iskb;
1088 hdr = buf_msg(skb);
1089 if (less(msg_seqno(hdr), l->drop_point))
1090 goto drop;
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001091 if (tipc_data_input(l, skb, inputq))
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001092 return rc;
1093 usr = msg_user(hdr);
1094 reasm_skb = &l->failover_reasm_skb;
1095 }
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001096
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001097 if (usr == MSG_BUNDLER) {
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001098 skb_queue_head_init(&tmpq);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001099 l->stats.recv_bundles++;
1100 l->stats.recv_bundled += msg_msgcnt(hdr);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001101 while (tipc_msg_extract(skb, &iskb, &pos))
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001102 tipc_data_input(l, iskb, &tmpq);
1103 tipc_skb_queue_splice_tail(&tmpq, inputq);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001104 return 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001105 } else if (usr == MSG_FRAGMENTER) {
1106 l->stats.recv_fragments++;
1107 if (tipc_buf_append(reasm_skb, &skb)) {
1108 l->stats.recv_fragmented++;
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001109 tipc_data_input(l, skb, inputq);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001110 } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) {
1111 pr_warn_ratelimited("Unable to build fragment list\n");
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001112 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001113 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001114 return 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001115 } else if (usr == BCAST_PROTOCOL) {
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001116 tipc_bcast_lock(l->net);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001117 tipc_link_bc_init_rcv(l->bc_rcvlink, hdr);
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001118 tipc_bcast_unlock(l->net);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001119 }
1120drop:
1121 kfree_skb(skb);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001122 return 0;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001123}
1124
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001125static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
1126{
1127 bool released = false;
1128 struct sk_buff *skb, *tmp;
1129
1130 skb_queue_walk_safe(&l->transmq, skb, tmp) {
1131 if (more(buf_seqno(skb), acked))
1132 break;
1133 __skb_unlink(skb, &l->transmq);
1134 kfree_skb(skb);
1135 released = true;
1136 }
1137 return released;
1138}
1139
Jon Paul Maloy34b9cd62016-04-15 13:33:07 -04001140/* tipc_link_build_state_msg: prepare link state message for transmission
Jon Paul Maloy52666982015-10-22 08:51:41 -04001141 *
1142 * Note that sending of broadcast ack is coordinated among nodes, to reduce
1143 * risk of ack storms towards the sender
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001144 */
Jon Paul Maloy34b9cd62016-04-15 13:33:07 -04001145int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001146{
Jon Paul Maloy52666982015-10-22 08:51:41 -04001147 if (!l)
1148 return 0;
1149
1150 /* Broadcast ACK must be sent via a unicast link => defer to caller */
1151 if (link_is_bc_rcvlink(l)) {
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001152 if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf)
Jon Paul Maloy52666982015-10-22 08:51:41 -04001153 return 0;
1154 l->rcv_unacked = 0;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001155
1156 /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */
1157 l->snd_nxt = l->rcv_nxt;
1158 return TIPC_LINK_SND_STATE;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001159 }
1160
1161 /* Unicast ACK */
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001162 l->rcv_unacked = 0;
1163 l->stats.sent_acks++;
1164 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001165 return 0;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001166}
1167
Jon Paul Maloy282b3a02015-10-15 14:52:45 -04001168/* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message
1169 */
1170void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
1171{
1172 int mtyp = RESET_MSG;
Jon Paul Maloy634696b2016-04-15 13:33:03 -04001173 struct sk_buff *skb;
Jon Paul Maloy282b3a02015-10-15 14:52:45 -04001174
1175 if (l->state == LINK_ESTABLISHING)
1176 mtyp = ACTIVATE_MSG;
1177
1178 tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq);
Jon Paul Maloy634696b2016-04-15 13:33:03 -04001179
1180 /* Inform peer that this endpoint is going down if applicable */
1181 skb = skb_peek_tail(xmitq);
1182 if (skb && (l->state == LINK_RESET))
1183 msg_set_peer_stopping(buf_msg(skb), 1);
Jon Paul Maloy282b3a02015-10-15 14:52:45 -04001184}
1185
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001186/* tipc_link_build_nack_msg: prepare link nack message for transmission
1187 */
1188static void tipc_link_build_nack_msg(struct tipc_link *l,
1189 struct sk_buff_head *xmitq)
1190{
1191 u32 def_cnt = ++l->stats.deferred_recv;
1192
Jon Paul Maloy52666982015-10-22 08:51:41 -04001193 if (link_is_bc_rcvlink(l))
1194 return;
1195
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001196 if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV))
1197 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
1198}
1199
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001200/* tipc_link_rcv - process TIPC packets/messages arriving from off-node
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001201 * @l: the link that should handle the message
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001202 * @skb: TIPC packet
1203 * @xmitq: queue to place packets to be sent after this call
1204 */
1205int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
1206 struct sk_buff_head *xmitq)
1207{
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001208 struct sk_buff_head *defq = &l->deferdq;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001209 struct tipc_msg *hdr;
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001210 u16 seqno, rcv_nxt, win_lim;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001211 int rc = 0;
1212
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001213 do {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001214 hdr = buf_msg(skb);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001215 seqno = msg_seqno(hdr);
1216 rcv_nxt = l->rcv_nxt;
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001217 win_lim = rcv_nxt + TIPC_MAX_LINK_WIN;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001218
1219 /* Verify and update link state */
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001220 if (unlikely(msg_user(hdr) == LINK_PROTOCOL))
1221 return tipc_link_proto_rcv(l, skb, xmitq);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001222
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001223 if (unlikely(!link_is_up(l))) {
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001224 if (l->state == LINK_ESTABLISHING)
1225 rc = TIPC_LINK_UP_EVT;
1226 goto drop;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001227 }
1228
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001229 /* Don't send probe at next timeout expiration */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001230 l->silent_intv_cnt = 0;
1231
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001232 /* Drop if outside receive window */
1233 if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) {
1234 l->stats.duplicates++;
1235 goto drop;
1236 }
1237
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001238 /* Forward queues and wake up waiting users */
1239 if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) {
1240 tipc_link_advance_backlog(l, xmitq);
1241 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1242 link_prepare_wakeup(l);
1243 }
1244
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001245 /* Defer delivery if sequence gap */
1246 if (unlikely(seqno != rcv_nxt)) {
Jon Paul Maloy8306f992015-10-15 14:52:43 -04001247 __tipc_skb_queue_sorted(defq, seqno, skb);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001248 tipc_link_build_nack_msg(l, xmitq);
1249 break;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001250 }
1251
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001252 /* Deliver packet */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001253 l->rcv_nxt++;
1254 l->stats.recv_info++;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001255 if (!tipc_data_input(l, skb, l->inputq))
Jon Paul Maloy52666982015-10-22 08:51:41 -04001256 rc |= tipc_link_input(l, skb, l->inputq);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001257 if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN))
Jon Paul Maloy34b9cd62016-04-15 13:33:07 -04001258 rc |= tipc_link_build_state_msg(l, xmitq);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001259 if (unlikely(rc & ~TIPC_LINK_SND_STATE))
Jon Paul Maloy52666982015-10-22 08:51:41 -04001260 break;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001261 } while ((skb = __skb_dequeue(defq)));
1262
1263 return rc;
1264drop:
1265 kfree_skb(skb);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001266 return rc;
1267}
1268
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001269static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
1270 u16 rcvgap, int tolerance, int priority,
1271 struct sk_buff_head *xmitq)
1272{
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001273 struct tipc_link *bcl = l->bc_rcvlink;
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001274 struct sk_buff *skb;
1275 struct tipc_msg *hdr;
1276 struct sk_buff_head *dfq = &l->deferdq;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001277 bool node_up = link_is_up(bcl);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001278 struct tipc_mon_state *mstate = &l->mon_state;
1279 int dlen = 0;
1280 void *data;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001281
1282 /* Don't send protocol message during reset or link failover */
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001283 if (tipc_link_is_blocked(l))
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001284 return;
1285
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001286 if (!tipc_link_is_up(l) && (mtyp == STATE_MSG))
1287 return;
1288
1289 if (!skb_queue_empty(dfq))
1290 rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt;
1291
1292 skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE,
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001293 tipc_max_domain_size, l->addr,
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001294 tipc_own_addr(l->net), 0, 0, 0);
1295 if (!skb)
1296 return;
1297
1298 hdr = buf_msg(skb);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001299 data = msg_data(hdr);
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001300 msg_set_session(hdr, l->session);
1301 msg_set_bearer_id(hdr, l->bearer_id);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001302 msg_set_net_plane(hdr, l->net_plane);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001303 msg_set_next_sent(hdr, l->snd_nxt);
1304 msg_set_ack(hdr, l->rcv_nxt - 1);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001305 msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001306 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001307 msg_set_link_tolerance(hdr, tolerance);
1308 msg_set_linkprio(hdr, priority);
1309 msg_set_redundant_link(hdr, node_up);
1310 msg_set_seq_gap(hdr, 0);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001311 msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001312
1313 if (mtyp == STATE_MSG) {
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001314 msg_set_seq_gap(hdr, rcvgap);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001315 msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl));
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001316 msg_set_probe(hdr, probe);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001317 tipc_mon_prep(l->net, data, &dlen, mstate, l->bearer_id);
1318 msg_set_size(hdr, INT_H_SIZE + dlen);
1319 skb_trim(skb, INT_H_SIZE + dlen);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001320 l->stats.sent_states++;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001321 l->rcv_unacked = 0;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001322 } else {
1323 /* RESET_MSG or ACTIVATE_MSG */
1324 msg_set_max_pkt(hdr, l->advertised_mtu);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001325 strcpy(data, l->if_name);
1326 msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME);
1327 skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001328 }
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001329 if (probe)
1330 l->stats.sent_probes++;
1331 if (rcvgap)
1332 l->stats.sent_nacks++;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001333 skb->priority = TC_PRIO_CONTROL;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001334 __skb_queue_tail(xmitq, skb);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001335}
Per Lidenb97bf3f2006-01-02 19:04:38 +01001336
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001337/* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001338 * with contents of the link's transmit and backlog queues.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001339 */
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001340void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
1341 int mtyp, struct sk_buff_head *xmitq)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001342{
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001343 struct sk_buff *skb, *tnlskb;
1344 struct tipc_msg *hdr, tnlhdr;
1345 struct sk_buff_head *queue = &l->transmq;
1346 struct sk_buff_head tmpxq, tnlq;
1347 u16 pktlen, pktcnt, seqno = l->snd_nxt;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001348
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001349 if (!tnl)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001350 return;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001351
1352 skb_queue_head_init(&tnlq);
1353 skb_queue_head_init(&tmpxq);
1354
1355 /* At least one packet required for safe algorithm => add dummy */
1356 skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001357 BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net),
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001358 0, 0, TIPC_ERR_NO_PORT);
Ying Xuea6ca1092014-11-26 11:41:55 +08001359 if (!skb) {
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001360 pr_warn("%sunable to create tunnel packet\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001361 return;
Allan Stephens5392d642006-06-25 23:52:50 -07001362 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001363 skb_queue_tail(&tnlq, skb);
1364 tipc_link_xmit(l, &tnlq, &tmpxq);
1365 __skb_queue_purge(&tmpxq);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001366
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001367 /* Initialize reusable tunnel packet header */
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001368 tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL,
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001369 mtyp, INT_H_SIZE, l->addr);
1370 pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq);
1371 msg_set_msgcnt(&tnlhdr, pktcnt);
1372 msg_set_bearer_id(&tnlhdr, l->peer_bearer_id);
1373tnl:
1374 /* Wrap each packet into a tunnel packet */
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -04001375 skb_queue_walk(queue, skb) {
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001376 hdr = buf_msg(skb);
1377 if (queue == &l->backlogq)
1378 msg_set_seqno(hdr, seqno++);
1379 pktlen = msg_size(hdr);
1380 msg_set_size(&tnlhdr, pktlen + INT_H_SIZE);
1381 tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE);
1382 if (!tnlskb) {
1383 pr_warn("%sunable to send packet\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001384 return;
1385 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001386 skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE);
1387 skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen);
1388 __skb_queue_tail(&tnlq, tnlskb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001389 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001390 if (queue != &l->backlogq) {
1391 queue = &l->backlogq;
1392 goto tnl;
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -04001393 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001394
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001395 tipc_link_xmit(tnl, &tnlq, xmitq);
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001396
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001397 if (mtyp == FAILOVER_MSG) {
1398 tnl->drop_point = l->rcv_nxt;
1399 tnl->failover_reasm_skb = l->reasm_buf;
1400 l->reasm_buf = NULL;
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001401 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001402}
1403
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001404/* tipc_link_proto_rcv(): receive link level protocol message :
1405 * Note that network plane id propagates through the network, and may
1406 * change at any time. The node with lowest numerical id determines
1407 * network plane
1408 */
1409static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
1410 struct sk_buff_head *xmitq)
1411{
1412 struct tipc_msg *hdr = buf_msg(skb);
1413 u16 rcvgap = 0;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001414 u16 ack = msg_ack(hdr);
1415 u16 gap = msg_seq_gap(hdr);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001416 u16 peers_snd_nxt = msg_next_sent(hdr);
1417 u16 peers_tol = msg_link_tolerance(hdr);
1418 u16 peers_prio = msg_linkprio(hdr);
Jon Paul Maloy2be80c22015-08-20 02:12:56 -04001419 u16 rcv_nxt = l->rcv_nxt;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001420 u16 dlen = msg_data_sz(hdr);
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001421 int mtyp = msg_type(hdr);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001422 void *data;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001423 char *if_name;
1424 int rc = 0;
1425
Jon Paul Maloy52666982015-10-22 08:51:41 -04001426 if (tipc_link_is_blocked(l) || !xmitq)
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001427 goto exit;
1428
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001429 if (tipc_own_addr(l->net) > msg_prevnode(hdr))
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001430 l->net_plane = msg_net_plane(hdr);
1431
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001432 skb_linearize(skb);
1433 hdr = buf_msg(skb);
1434 data = msg_data(hdr);
1435
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001436 switch (mtyp) {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001437 case RESET_MSG:
1438
1439 /* Ignore duplicate RESET with old session number */
1440 if ((less_eq(msg_session(hdr), l->peer_session)) &&
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001441 (l->peer_session != ANY_SESSION))
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001442 break;
1443 /* fall thru' */
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001444
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001445 case ACTIVATE_MSG:
1446
1447 /* Complete own link name with peer's interface name */
1448 if_name = strrchr(l->name, ':') + 1;
1449 if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME)
1450 break;
1451 if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
1452 break;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001453 strncpy(if_name, data, TIPC_MAX_IF_NAME);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001454
1455 /* Update own tolerance if peer indicates a non-zero value */
1456 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
1457 l->tolerance = peers_tol;
1458
1459 /* Update own priority if peer's priority is higher */
1460 if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
1461 l->priority = peers_prio;
1462
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001463 /* ACTIVATE_MSG serves as PEER_RESET if link is already down */
Jon Paul Maloy634696b2016-04-15 13:33:03 -04001464 if (msg_peer_stopping(hdr))
1465 rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1466 else if ((mtyp == RESET_MSG) || !link_is_up(l))
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001467 rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
1468
1469 /* ACTIVATE_MSG takes up link if it was already locally reset */
1470 if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING))
1471 rc = TIPC_LINK_UP_EVT;
1472
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001473 l->peer_session = msg_session(hdr);
1474 l->peer_bearer_id = msg_bearer_id(hdr);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001475 if (l->mtu > msg_max_pkt(hdr))
1476 l->mtu = msg_max_pkt(hdr);
1477 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001478
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001479 case STATE_MSG:
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001480
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001481 /* Update own tolerance if peer indicates a non-zero value */
1482 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
1483 l->tolerance = peers_tol;
1484
Richard Alpe81729812016-02-01 08:19:57 +01001485 if (peers_prio && in_range(peers_prio, TIPC_MIN_LINK_PRI,
1486 TIPC_MAX_LINK_PRI)) {
1487 l->priority = peers_prio;
1488 rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1489 }
1490
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001491 l->silent_intv_cnt = 0;
1492 l->stats.recv_states++;
1493 if (msg_probe(hdr))
1494 l->stats.recv_probes++;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001495
1496 if (!link_is_up(l)) {
1497 if (l->state == LINK_ESTABLISHING)
1498 rc = TIPC_LINK_UP_EVT;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001499 break;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001500 }
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001501 tipc_mon_rcv(l->net, data, dlen, l->addr,
1502 &l->mon_state, l->bearer_id);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001503
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001504 /* Send NACK if peer has sent pkts we haven't received yet */
Jon Paul Maloy2be80c22015-08-20 02:12:56 -04001505 if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l))
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001506 rcvgap = peers_snd_nxt - l->rcv_nxt;
1507 if (rcvgap || (msg_probe(hdr)))
1508 tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap,
Jon Paul Maloy16040892015-07-21 06:42:28 -04001509 0, 0, xmitq);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001510 tipc_link_release_pkts(l, ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001511
1512 /* If NACK, retransmit will now start at right position */
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001513 if (gap) {
1514 rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001515 l->stats.recv_nacks++;
1516 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001517
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001518 tipc_link_advance_backlog(l, xmitq);
1519 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1520 link_prepare_wakeup(l);
1521 }
1522exit:
1523 kfree_skb(skb);
1524 return rc;
1525}
1526
Jon Paul Maloy52666982015-10-22 08:51:41 -04001527/* tipc_link_build_bc_proto_msg() - create broadcast protocol message
1528 */
1529static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast,
1530 u16 peers_snd_nxt,
1531 struct sk_buff_head *xmitq)
1532{
1533 struct sk_buff *skb;
1534 struct tipc_msg *hdr;
1535 struct sk_buff *dfrd_skb = skb_peek(&l->deferdq);
1536 u16 ack = l->rcv_nxt - 1;
1537 u16 gap_to = peers_snd_nxt - 1;
1538
1539 skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001540 0, l->addr, tipc_own_addr(l->net), 0, 0, 0);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001541 if (!skb)
1542 return false;
1543 hdr = buf_msg(skb);
1544 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
1545 msg_set_bcast_ack(hdr, ack);
1546 msg_set_bcgap_after(hdr, ack);
1547 if (dfrd_skb)
1548 gap_to = buf_seqno(dfrd_skb) - 1;
1549 msg_set_bcgap_to(hdr, gap_to);
1550 msg_set_non_seq(hdr, bcast);
1551 __skb_queue_tail(xmitq, skb);
1552 return true;
1553}
1554
1555/* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints.
1556 *
1557 * Give a newly added peer node the sequence number where it should
1558 * start receiving and acking broadcast packets.
1559 */
Wu Fengguang742e0382015-10-24 22:56:01 +08001560static void tipc_link_build_bc_init_msg(struct tipc_link *l,
1561 struct sk_buff_head *xmitq)
Jon Paul Maloy52666982015-10-22 08:51:41 -04001562{
1563 struct sk_buff_head list;
1564
1565 __skb_queue_head_init(&list);
1566 if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list))
1567 return;
1568 tipc_link_xmit(l, &list, xmitq);
1569}
1570
1571/* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer
1572 */
1573void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr)
1574{
1575 int mtyp = msg_type(hdr);
1576 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
1577
1578 if (link_is_up(l))
1579 return;
1580
1581 if (msg_user(hdr) == BCAST_PROTOCOL) {
1582 l->rcv_nxt = peers_snd_nxt;
1583 l->state = LINK_ESTABLISHED;
1584 return;
1585 }
1586
1587 if (l->peer_caps & TIPC_BCAST_SYNCH)
1588 return;
1589
1590 if (msg_peer_node_is_up(hdr))
1591 return;
1592
1593 /* Compatibility: accept older, less safe initial synch data */
1594 if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG))
1595 l->rcv_nxt = peers_snd_nxt;
1596}
1597
Jon Paul Maloy7c4a54b2016-09-01 13:52:50 -04001598/* link_bc_retr eval()- check if the indicated range can be retransmitted now
1599 * - Adjust permitted range if there is overlap with previous retransmission
1600 */
1601static bool link_bc_retr_eval(struct tipc_link *l, u16 *from, u16 *to)
1602{
1603 unsigned long elapsed = jiffies_to_msecs(jiffies - l->prev_retr);
1604
1605 if (less(*to, *from))
1606 return false;
1607
1608 /* New retransmission request */
1609 if ((elapsed > TIPC_BC_RETR_LIMIT) ||
1610 less(*to, l->prev_from) || more(*from, l->prev_to)) {
1611 l->prev_from = *from;
1612 l->prev_to = *to;
1613 l->prev_retr = jiffies;
1614 return true;
1615 }
1616
1617 /* Inside range of previous retransmit */
1618 if (!less(*from, l->prev_from) && !more(*to, l->prev_to))
1619 return false;
1620
1621 /* Fully or partially outside previous range => exclude overlap */
1622 if (less(*from, l->prev_from)) {
1623 *to = l->prev_from - 1;
1624 l->prev_from = *from;
1625 }
1626 if (more(*to, l->prev_to)) {
1627 *from = l->prev_to + 1;
1628 l->prev_to = *to;
1629 }
1630 l->prev_retr = jiffies;
1631 return true;
1632}
1633
Jon Paul Maloy52666982015-10-22 08:51:41 -04001634/* tipc_link_bc_sync_rcv - update rcv link according to peer's send state
1635 */
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001636int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
1637 struct sk_buff_head *xmitq)
Jon Paul Maloy52666982015-10-22 08:51:41 -04001638{
Jon Paul Maloy7c4a54b2016-09-01 13:52:50 -04001639 struct tipc_link *snd_l = l->bc_sndlink;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001640 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001641 u16 from = msg_bcast_ack(hdr) + 1;
1642 u16 to = from + msg_bc_gap(hdr) - 1;
1643 int rc = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001644
1645 if (!link_is_up(l))
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001646 return rc;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001647
1648 if (!msg_peer_node_is_up(hdr))
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001649 return rc;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001650
Jon Paul Maloy2d18ac42016-07-11 16:08:35 -04001651 /* Open when peer ackowledges our bcast init msg (pkt #1) */
1652 if (msg_ack(hdr))
1653 l->bc_peer_is_up = true;
1654
1655 if (!l->bc_peer_is_up)
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001656 return rc;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001657
Jon Paul Maloy7c4a54b2016-09-01 13:52:50 -04001658 l->stats.recv_nacks++;
1659
Jon Paul Maloy52666982015-10-22 08:51:41 -04001660 /* Ignore if peers_snd_nxt goes beyond receive window */
1661 if (more(peers_snd_nxt, l->rcv_nxt + l->window))
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001662 return rc;
1663
Jon Paul Maloy7c4a54b2016-09-01 13:52:50 -04001664 if (link_bc_retr_eval(snd_l, &from, &to))
1665 rc = tipc_link_retrans(snd_l, from, to, xmitq);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001666
1667 l->snd_nxt = peers_snd_nxt;
1668 if (link_bc_rcv_gap(l))
1669 rc |= TIPC_LINK_SND_STATE;
1670
1671 /* Return now if sender supports nack via STATE messages */
1672 if (l->peer_caps & TIPC_BCAST_STATE_NACK)
1673 return rc;
1674
1675 /* Otherwise, be backwards compatible */
Jon Paul Maloy52666982015-10-22 08:51:41 -04001676
1677 if (!more(peers_snd_nxt, l->rcv_nxt)) {
1678 l->nack_state = BC_NACK_SND_CONDITIONAL;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001679 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001680 }
1681
1682 /* Don't NACK if one was recently sent or peeked */
1683 if (l->nack_state == BC_NACK_SND_SUPPRESS) {
1684 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001685 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001686 }
1687
1688 /* Conditionally delay NACK sending until next synch rcv */
1689 if (l->nack_state == BC_NACK_SND_CONDITIONAL) {
1690 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
1691 if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN)
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001692 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001693 }
1694
1695 /* Send NACK now but suppress next one */
1696 tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq);
1697 l->nack_state = BC_NACK_SND_SUPPRESS;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001698 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001699}
1700
1701void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked,
1702 struct sk_buff_head *xmitq)
1703{
1704 struct sk_buff *skb, *tmp;
1705 struct tipc_link *snd_l = l->bc_sndlink;
1706
1707 if (!link_is_up(l) || !l->bc_peer_is_up)
1708 return;
1709
1710 if (!more(acked, l->acked))
1711 return;
1712
1713 /* Skip over packets peer has already acked */
1714 skb_queue_walk(&snd_l->transmq, skb) {
1715 if (more(buf_seqno(skb), l->acked))
1716 break;
1717 }
1718
1719 /* Update/release the packets peer is acking now */
1720 skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) {
1721 if (more(buf_seqno(skb), acked))
1722 break;
1723 if (!--TIPC_SKB_CB(skb)->ackers) {
1724 __skb_unlink(skb, &snd_l->transmq);
1725 kfree_skb(skb);
1726 }
1727 }
1728 l->acked = acked;
1729 tipc_link_advance_backlog(snd_l, xmitq);
1730 if (unlikely(!skb_queue_empty(&snd_l->wakeupq)))
1731 link_prepare_wakeup(snd_l);
1732}
1733
1734/* tipc_link_bc_nack_rcv(): receive broadcast nack message
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001735 * This function is here for backwards compatibility, since
1736 * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5.
Jon Paul Maloy52666982015-10-22 08:51:41 -04001737 */
1738int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
1739 struct sk_buff_head *xmitq)
1740{
1741 struct tipc_msg *hdr = buf_msg(skb);
1742 u32 dnode = msg_destnode(hdr);
1743 int mtyp = msg_type(hdr);
1744 u16 acked = msg_bcast_ack(hdr);
1745 u16 from = acked + 1;
1746 u16 to = msg_bcgap_to(hdr);
1747 u16 peers_snd_nxt = to + 1;
1748 int rc = 0;
1749
1750 kfree_skb(skb);
1751
1752 if (!tipc_link_is_up(l) || !l->bc_peer_is_up)
1753 return 0;
1754
1755 if (mtyp != STATE_MSG)
1756 return 0;
1757
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001758 if (dnode == tipc_own_addr(l->net)) {
Jon Paul Maloy52666982015-10-22 08:51:41 -04001759 tipc_link_bc_ack_rcv(l, acked, xmitq);
1760 rc = tipc_link_retrans(l->bc_sndlink, from, to, xmitq);
1761 l->stats.recv_nacks++;
1762 return rc;
1763 }
1764
1765 /* Msg for other node => suppress own NACK at next sync if applicable */
1766 if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from))
1767 l->nack_state = BC_NACK_SND_SUPPRESS;
1768
1769 return 0;
1770}
1771
Jon Paul Maloye3eea1e2015-03-13 16:08:11 -04001772void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001773{
Jon Paul Maloyed193ec2015-04-02 09:33:02 -04001774 int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE);
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -04001775
Jon Paul Maloye3eea1e2015-03-13 16:08:11 -04001776 l->window = win;
Jon Paul Maloy5a0950c2016-08-16 11:53:51 -04001777 l->backlog[TIPC_LOW_IMPORTANCE].limit = max_t(u16, 50, win);
1778 l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = max_t(u16, 100, win * 2);
1779 l->backlog[TIPC_HIGH_IMPORTANCE].limit = max_t(u16, 150, win * 3);
1780 l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = max_t(u16, 200, win * 4);
Jon Paul Maloy1f66d162015-03-25 12:07:24 -04001781 l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001782}
1783
Allan Stephens5c216e12011-10-18 11:34:29 -04001784/**
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001785 * link_reset_stats - reset link statistics
Jon Paul Maloy1a906322015-11-19 14:30:47 -05001786 * @l: pointer to link
Per Lidenb97bf3f2006-01-02 19:04:38 +01001787 */
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001788void tipc_link_reset_stats(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001789{
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001790 memset(&l->stats, 0, sizeof(l->stats));
1791 if (!link_is_bc_sndlink(l)) {
1792 l->stats.sent_info = l->snd_nxt;
1793 l->stats.recv_info = l->rcv_nxt;
1794 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001795}
1796
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001797static void link_print(struct tipc_link *l, const char *str)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001798{
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001799 struct sk_buff *hskb = skb_peek(&l->transmq);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001800 u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1;
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001801 u16 tail = l->snd_nxt - 1;
Ying Xue7a2f7d12014-04-21 10:55:46 +08001802
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001803 pr_info("%s Link <%s> state %x\n", str, l->name, l->state);
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001804 pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n",
1805 skb_queue_len(&l->transmq), head, tail,
1806 skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001807}
Richard Alpe0655f6a2014-11-20 10:29:07 +01001808
1809/* Parse and validate nested (link) properties valid for media, bearer and link
1810 */
1811int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
1812{
1813 int err;
1814
1815 err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop,
1816 tipc_nl_prop_policy);
1817 if (err)
1818 return err;
1819
1820 if (props[TIPC_NLA_PROP_PRIO]) {
1821 u32 prio;
1822
1823 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1824 if (prio > TIPC_MAX_LINK_PRI)
1825 return -EINVAL;
1826 }
1827
1828 if (props[TIPC_NLA_PROP_TOL]) {
1829 u32 tol;
1830
1831 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1832 if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
1833 return -EINVAL;
1834 }
1835
1836 if (props[TIPC_NLA_PROP_WIN]) {
1837 u32 win;
1838
1839 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1840 if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN))
1841 return -EINVAL;
1842 }
1843
1844 return 0;
1845}
Richard Alpe7be57fc2014-11-20 10:29:12 +01001846
Richard Alped8182802014-11-24 11:10:29 +01001847static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
Richard Alpe7be57fc2014-11-20 10:29:12 +01001848{
1849 int i;
1850 struct nlattr *stats;
1851
1852 struct nla_map {
1853 u32 key;
1854 u32 val;
1855 };
1856
1857 struct nla_map map[] = {
1858 {TIPC_NLA_STATS_RX_INFO, s->recv_info},
1859 {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments},
1860 {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented},
1861 {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles},
1862 {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled},
1863 {TIPC_NLA_STATS_TX_INFO, s->sent_info},
1864 {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments},
1865 {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented},
1866 {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles},
1867 {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled},
1868 {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ?
1869 s->msg_length_counts : 1},
1870 {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts},
1871 {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total},
1872 {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]},
1873 {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]},
1874 {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]},
1875 {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]},
1876 {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]},
1877 {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]},
1878 {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]},
1879 {TIPC_NLA_STATS_RX_STATES, s->recv_states},
1880 {TIPC_NLA_STATS_RX_PROBES, s->recv_probes},
1881 {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks},
1882 {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv},
1883 {TIPC_NLA_STATS_TX_STATES, s->sent_states},
1884 {TIPC_NLA_STATS_TX_PROBES, s->sent_probes},
1885 {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks},
1886 {TIPC_NLA_STATS_TX_ACKS, s->sent_acks},
1887 {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted},
1888 {TIPC_NLA_STATS_DUPLICATES, s->duplicates},
1889 {TIPC_NLA_STATS_LINK_CONGS, s->link_congs},
1890 {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz},
1891 {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ?
1892 (s->accu_queue_sz / s->queue_sz_counts) : 0}
1893 };
1894
1895 stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
1896 if (!stats)
1897 return -EMSGSIZE;
1898
1899 for (i = 0; i < ARRAY_SIZE(map); i++)
1900 if (nla_put_u32(skb, map[i].key, map[i].val))
1901 goto msg_full;
1902
1903 nla_nest_end(skb, stats);
1904
1905 return 0;
1906msg_full:
1907 nla_nest_cancel(skb, stats);
1908
1909 return -EMSGSIZE;
1910}
1911
1912/* Caller should hold appropriate locks to protect the link */
Jon Paul Maloy5be9c082015-11-19 14:30:45 -05001913int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
1914 struct tipc_link *link, int nlflags)
Richard Alpe7be57fc2014-11-20 10:29:12 +01001915{
1916 int err;
1917 void *hdr;
1918 struct nlattr *attrs;
1919 struct nlattr *prop;
Ying Xue34747532015-01-09 15:27:10 +08001920 struct tipc_net *tn = net_generic(net, tipc_net_id);
Richard Alpe7be57fc2014-11-20 10:29:12 +01001921
Richard Alpebfb3e5d2015-02-09 09:50:03 +01001922 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
Nicolas Dichtelf2f67392015-04-28 18:33:50 +02001923 nlflags, TIPC_NL_LINK_GET);
Richard Alpe7be57fc2014-11-20 10:29:12 +01001924 if (!hdr)
1925 return -EMSGSIZE;
1926
1927 attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
1928 if (!attrs)
1929 goto msg_full;
1930
1931 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name))
1932 goto attr_msg_full;
1933 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST,
Ying Xue34747532015-01-09 15:27:10 +08001934 tipc_cluster_mask(tn->own_addr)))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001935 goto attr_msg_full;
Jon Paul Maloyed193ec2015-04-02 09:33:02 -04001936 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001937 goto attr_msg_full;
Jon Paul Maloya97b9d32015-05-14 10:46:15 -04001938 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001939 goto attr_msg_full;
Jon Paul Maloya97b9d32015-05-14 10:46:15 -04001940 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001941 goto attr_msg_full;
1942
1943 if (tipc_link_is_up(link))
1944 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
1945 goto attr_msg_full;
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001946 if (link->active)
Richard Alpe7be57fc2014-11-20 10:29:12 +01001947 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE))
1948 goto attr_msg_full;
1949
1950 prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
1951 if (!prop)
1952 goto attr_msg_full;
1953 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
1954 goto prop_msg_full;
1955 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance))
1956 goto prop_msg_full;
1957 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN,
Jon Paul Maloy1f66d162015-03-25 12:07:24 -04001958 link->window))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001959 goto prop_msg_full;
1960 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
1961 goto prop_msg_full;
1962 nla_nest_end(msg->skb, prop);
1963
1964 err = __tipc_nl_add_stats(msg->skb, &link->stats);
1965 if (err)
1966 goto attr_msg_full;
1967
1968 nla_nest_end(msg->skb, attrs);
1969 genlmsg_end(msg->skb, hdr);
1970
1971 return 0;
1972
1973prop_msg_full:
1974 nla_nest_cancel(msg->skb, prop);
1975attr_msg_full:
1976 nla_nest_cancel(msg->skb, attrs);
1977msg_full:
1978 genlmsg_cancel(msg->skb, hdr);
1979
1980 return -EMSGSIZE;
1981}
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001982
1983static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb,
1984 struct tipc_stats *stats)
1985{
1986 int i;
1987 struct nlattr *nest;
1988
1989 struct nla_map {
1990 __u32 key;
1991 __u32 val;
1992 };
1993
1994 struct nla_map map[] = {
1995 {TIPC_NLA_STATS_RX_INFO, stats->recv_info},
1996 {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments},
1997 {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented},
1998 {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles},
1999 {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled},
2000 {TIPC_NLA_STATS_TX_INFO, stats->sent_info},
2001 {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments},
2002 {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented},
2003 {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles},
2004 {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled},
2005 {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks},
2006 {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv},
2007 {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks},
2008 {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks},
2009 {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted},
2010 {TIPC_NLA_STATS_DUPLICATES, stats->duplicates},
2011 {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs},
2012 {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz},
2013 {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ?
2014 (stats->accu_queue_sz / stats->queue_sz_counts) : 0}
2015 };
2016
2017 nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
2018 if (!nest)
2019 return -EMSGSIZE;
2020
2021 for (i = 0; i < ARRAY_SIZE(map); i++)
2022 if (nla_put_u32(skb, map[i].key, map[i].val))
2023 goto msg_full;
2024
2025 nla_nest_end(skb, nest);
2026
2027 return 0;
2028msg_full:
2029 nla_nest_cancel(skb, nest);
2030
2031 return -EMSGSIZE;
2032}
2033
2034int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg)
2035{
2036 int err;
2037 void *hdr;
2038 struct nlattr *attrs;
2039 struct nlattr *prop;
2040 struct tipc_net *tn = net_generic(net, tipc_net_id);
2041 struct tipc_link *bcl = tn->bcl;
2042
2043 if (!bcl)
2044 return 0;
2045
2046 tipc_bcast_lock(net);
2047
2048 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2049 NLM_F_MULTI, TIPC_NL_LINK_GET);
Insu Yunb53ce3e2016-02-17 11:47:35 -05002050 if (!hdr) {
2051 tipc_bcast_unlock(net);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002052 return -EMSGSIZE;
Insu Yunb53ce3e2016-02-17 11:47:35 -05002053 }
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002054
2055 attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
2056 if (!attrs)
2057 goto msg_full;
2058
2059 /* The broadcast link is always up */
2060 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
2061 goto attr_msg_full;
2062
2063 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST))
2064 goto attr_msg_full;
2065 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name))
2066 goto attr_msg_full;
2067 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, bcl->rcv_nxt))
2068 goto attr_msg_full;
2069 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, bcl->snd_nxt))
2070 goto attr_msg_full;
2071
2072 prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
2073 if (!prop)
2074 goto attr_msg_full;
2075 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window))
2076 goto prop_msg_full;
2077 nla_nest_end(msg->skb, prop);
2078
2079 err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats);
2080 if (err)
2081 goto attr_msg_full;
2082
2083 tipc_bcast_unlock(net);
2084 nla_nest_end(msg->skb, attrs);
2085 genlmsg_end(msg->skb, hdr);
2086
2087 return 0;
2088
2089prop_msg_full:
2090 nla_nest_cancel(msg->skb, prop);
2091attr_msg_full:
2092 nla_nest_cancel(msg->skb, attrs);
2093msg_full:
2094 tipc_bcast_unlock(net);
2095 genlmsg_cancel(msg->skb, hdr);
2096
2097 return -EMSGSIZE;
2098}
2099
Richard Alped01332f2016-02-01 08:19:56 +01002100void tipc_link_set_tolerance(struct tipc_link *l, u32 tol,
2101 struct sk_buff_head *xmitq)
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002102{
2103 l->tolerance = tol;
Richard Alped01332f2016-02-01 08:19:56 +01002104 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, tol, 0, xmitq);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002105}
2106
Richard Alped01332f2016-02-01 08:19:56 +01002107void tipc_link_set_prio(struct tipc_link *l, u32 prio,
2108 struct sk_buff_head *xmitq)
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002109{
2110 l->priority = prio;
Richard Alped01332f2016-02-01 08:19:56 +01002111 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, prio, xmitq);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002112}
2113
2114void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit)
2115{
2116 l->abort_limit = limit;
2117}