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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 {
Jon Paul Maloy95901122016-11-25 10:35:02 -050050 u32 sent_pkts;
51 u32 recv_pkts;
Jon Paul Maloy38206d52015-11-19 14:30:46 -050052 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 Maloye0a05eb2016-09-01 13:52:51 -0400245static int tipc_link_build_nack_msg(struct tipc_link *l,
246 struct sk_buff_head *xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400247static 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->stale_count = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400861 l->bc_peer_is_up = false;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -0400862 memset(&l->mon_state, 0, sizeof(l->mon_state));
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500863 tipc_link_reset_stats(l);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100864}
865
Per Lidenb97bf3f2006-01-02 19:04:38 +0100866/**
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400867 * tipc_link_xmit(): enqueue buffer list according to queue situation
868 * @link: link to use
869 * @list: chain of buffers containing message
870 * @xmitq: returned list of packets to be sent by caller
871 *
872 * Consumes the buffer chain, except when returning -ELINKCONG,
873 * since the caller then may want to make more send attempts.
874 * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
875 * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
876 */
877int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
878 struct sk_buff_head *xmitq)
879{
880 struct tipc_msg *hdr = buf_msg(skb_peek(list));
881 unsigned int maxwin = l->window;
882 unsigned int i, imp = msg_importance(hdr);
883 unsigned int mtu = l->mtu;
884 u16 ack = l->rcv_nxt - 1;
885 u16 seqno = l->snd_nxt;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400886 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400887 struct sk_buff_head *transmq = &l->transmq;
888 struct sk_buff_head *backlogq = &l->backlogq;
889 struct sk_buff *skb, *_skb, *bskb;
Jon Paul Maloy95901122016-11-25 10:35:02 -0500890 int pkt_cnt = skb_queue_len(list);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400891
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
Jon Paul Maloy95901122016-11-25 10:35:02 -0500904 if (pkt_cnt > 1) {
905 l->stats.sent_fragmented++;
906 l->stats.sent_fragments += pkt_cnt;
907 }
908
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400909 /* Prepare each packet for sending, and add to relevant queue: */
910 while (skb_queue_len(list)) {
911 skb = skb_peek(list);
912 hdr = buf_msg(skb);
913 msg_set_seqno(hdr, seqno);
914 msg_set_ack(hdr, ack);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400915 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400916
917 if (likely(skb_queue_len(transmq) < maxwin)) {
918 _skb = skb_clone(skb, GFP_ATOMIC);
Richard Alpe4952cd32016-02-11 10:43:15 +0100919 if (!_skb) {
920 skb_queue_purge(list);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400921 return -ENOBUFS;
Richard Alpe4952cd32016-02-11 10:43:15 +0100922 }
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400923 __skb_dequeue(list);
924 __skb_queue_tail(transmq, skb);
925 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400926 TIPC_SKB_CB(skb)->ackers = l->ackers;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400927 l->rcv_unacked = 0;
Jon Paul Maloy95901122016-11-25 10:35:02 -0500928 l->stats.sent_pkts++;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400929 seqno++;
930 continue;
931 }
932 if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) {
933 kfree_skb(__skb_dequeue(list));
934 l->stats.sent_bundled++;
935 continue;
936 }
937 if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) {
938 kfree_skb(__skb_dequeue(list));
939 __skb_queue_tail(backlogq, bskb);
940 l->backlog[msg_importance(buf_msg(bskb))].len++;
941 l->stats.sent_bundled++;
942 l->stats.sent_bundles++;
943 continue;
944 }
945 l->backlog[imp].len += skb_queue_len(list);
946 skb_queue_splice_tail_init(list, backlogq);
947 }
948 l->snd_nxt = seqno;
949 return 0;
950}
951
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400952void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq)
953{
954 struct sk_buff *skb, *_skb;
955 struct tipc_msg *hdr;
956 u16 seqno = l->snd_nxt;
957 u16 ack = l->rcv_nxt - 1;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400958 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400959
960 while (skb_queue_len(&l->transmq) < l->window) {
961 skb = skb_peek(&l->backlogq);
962 if (!skb)
963 break;
964 _skb = skb_clone(skb, GFP_ATOMIC);
965 if (!_skb)
966 break;
967 __skb_dequeue(&l->backlogq);
968 hdr = buf_msg(skb);
969 l->backlog[msg_importance(hdr)].len--;
970 __skb_queue_tail(&l->transmq, skb);
971 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400972 TIPC_SKB_CB(skb)->ackers = l->ackers;
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400973 msg_set_seqno(hdr, seqno);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400974 msg_set_ack(hdr, ack);
975 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400976 l->rcv_unacked = 0;
Jon Paul Maloy95901122016-11-25 10:35:02 -0500977 l->stats.sent_pkts++;
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400978 seqno++;
979 }
980 l->snd_nxt = seqno;
981}
982
Jon Paul Maloy52666982015-10-22 08:51:41 -0400983static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb)
Allan Stephensd356eeb2006-06-25 23:40:01 -0700984{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400985 struct tipc_msg *hdr = buf_msg(skb);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700986
Jon Paul Maloy52666982015-10-22 08:51:41 -0400987 pr_warn("Retransmission failure on link <%s>\n", l->name);
988 link_print(l, "Resetting link ");
989 pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
990 msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr));
991 pr_info("sqno %u, prev: %x, src: %x\n",
992 msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr));
Allan Stephensd356eeb2006-06-25 23:40:01 -0700993}
994
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400995int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to,
996 struct sk_buff_head *xmitq)
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400997{
998 struct sk_buff *_skb, *skb = skb_peek(&l->transmq);
999 struct tipc_msg *hdr;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001000 u16 ack = l->rcv_nxt - 1;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001001 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001002
1003 if (!skb)
1004 return 0;
1005
1006 /* Detect repeated retransmit failures on same packet */
1007 if (likely(l->last_retransm != buf_seqno(skb))) {
1008 l->last_retransm = buf_seqno(skb);
1009 l->stale_count = 1;
1010 } else if (++l->stale_count > 100) {
1011 link_retransmit_failure(l, skb);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001012 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001013 }
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001014
1015 /* Move forward to where retransmission should start */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001016 skb_queue_walk(&l->transmq, skb) {
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001017 if (!less(buf_seqno(skb), from))
1018 break;
1019 }
1020
1021 skb_queue_walk_from(&l->transmq, skb) {
1022 if (more(buf_seqno(skb), to))
1023 break;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001024 hdr = buf_msg(skb);
1025 _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC);
1026 if (!_skb)
1027 return 0;
1028 hdr = buf_msg(_skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001029 msg_set_ack(hdr, ack);
1030 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001031 _skb->priority = TC_PRIO_CONTROL;
1032 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001033 l->stats.retransmitted++;
1034 }
1035 return 0;
1036}
1037
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001038/* tipc_data_input - deliver data and name distr msgs to upper layer
Erik Hugne7ae934b2014-07-01 10:22:40 +02001039 *
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001040 * Consumes buffer if message is of right type
Erik Hugne7ae934b2014-07-01 10:22:40 +02001041 * Node lock must be held
1042 */
Jon Paul Maloy52666982015-10-22 08:51:41 -04001043static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb,
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001044 struct sk_buff_head *inputq)
Erik Hugne7ae934b2014-07-01 10:22:40 +02001045{
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001046 switch (msg_user(buf_msg(skb))) {
Erik Hugne7ae934b2014-07-01 10:22:40 +02001047 case TIPC_LOW_IMPORTANCE:
1048 case TIPC_MEDIUM_IMPORTANCE:
1049 case TIPC_HIGH_IMPORTANCE:
1050 case TIPC_CRITICAL_IMPORTANCE:
1051 case CONN_MANAGER:
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001052 skb_queue_tail(inputq, skb);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001053 return true;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001054 case NAME_DISTRIBUTOR:
Jon Paul Maloy52666982015-10-22 08:51:41 -04001055 l->bc_rcvlink->state = LINK_ESTABLISHED;
1056 skb_queue_tail(l->namedq, skb);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001057 return true;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001058 case MSG_BUNDLER:
Jon Paul Maloydff29b12015-04-02 09:33:01 -04001059 case TUNNEL_PROTOCOL:
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001060 case MSG_FRAGMENTER:
1061 case BCAST_PROTOCOL:
1062 return false;
1063 default:
1064 pr_warn("Dropping received illegal msg type\n");
1065 kfree_skb(skb);
1066 return false;
1067 };
1068}
1069
1070/* tipc_link_input - process packet that has passed link protocol check
1071 *
1072 * Consumes buffer
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001073 */
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001074static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,
1075 struct sk_buff_head *inputq)
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001076{
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001077 struct tipc_msg *hdr = buf_msg(skb);
1078 struct sk_buff **reasm_skb = &l->reasm_buf;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001079 struct sk_buff *iskb;
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001080 struct sk_buff_head tmpq;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001081 int usr = msg_user(hdr);
Jon Paul Maloy6144a992015-07-30 18:24:16 -04001082 int rc = 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001083 int pos = 0;
1084 int ipos = 0;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001085
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001086 if (unlikely(usr == TUNNEL_PROTOCOL)) {
1087 if (msg_type(hdr) == SYNCH_MSG) {
1088 __skb_queue_purge(&l->deferdq);
1089 goto drop;
Jon Paul Maloy8b4ed862015-03-25 12:07:26 -04001090 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001091 if (!tipc_msg_extract(skb, &iskb, &ipos))
1092 return rc;
1093 kfree_skb(skb);
1094 skb = iskb;
1095 hdr = buf_msg(skb);
1096 if (less(msg_seqno(hdr), l->drop_point))
1097 goto drop;
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001098 if (tipc_data_input(l, skb, inputq))
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001099 return rc;
1100 usr = msg_user(hdr);
1101 reasm_skb = &l->failover_reasm_skb;
1102 }
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001103
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001104 if (usr == MSG_BUNDLER) {
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001105 skb_queue_head_init(&tmpq);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001106 l->stats.recv_bundles++;
1107 l->stats.recv_bundled += msg_msgcnt(hdr);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001108 while (tipc_msg_extract(skb, &iskb, &pos))
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001109 tipc_data_input(l, iskb, &tmpq);
1110 tipc_skb_queue_splice_tail(&tmpq, inputq);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001111 return 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001112 } else if (usr == MSG_FRAGMENTER) {
1113 l->stats.recv_fragments++;
1114 if (tipc_buf_append(reasm_skb, &skb)) {
1115 l->stats.recv_fragmented++;
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001116 tipc_data_input(l, skb, inputq);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001117 } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) {
1118 pr_warn_ratelimited("Unable to build fragment list\n");
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001119 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001120 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001121 return 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001122 } else if (usr == BCAST_PROTOCOL) {
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001123 tipc_bcast_lock(l->net);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001124 tipc_link_bc_init_rcv(l->bc_rcvlink, hdr);
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001125 tipc_bcast_unlock(l->net);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001126 }
1127drop:
1128 kfree_skb(skb);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001129 return 0;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001130}
1131
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001132static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
1133{
1134 bool released = false;
1135 struct sk_buff *skb, *tmp;
1136
1137 skb_queue_walk_safe(&l->transmq, skb, tmp) {
1138 if (more(buf_seqno(skb), acked))
1139 break;
1140 __skb_unlink(skb, &l->transmq);
1141 kfree_skb(skb);
1142 released = true;
1143 }
1144 return released;
1145}
1146
Jon Paul Maloy34b9cd62016-04-15 13:33:07 -04001147/* tipc_link_build_state_msg: prepare link state message for transmission
Jon Paul Maloy52666982015-10-22 08:51:41 -04001148 *
1149 * Note that sending of broadcast ack is coordinated among nodes, to reduce
1150 * risk of ack storms towards the sender
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001151 */
Jon Paul Maloy34b9cd62016-04-15 13:33:07 -04001152int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001153{
Jon Paul Maloy52666982015-10-22 08:51:41 -04001154 if (!l)
1155 return 0;
1156
1157 /* Broadcast ACK must be sent via a unicast link => defer to caller */
1158 if (link_is_bc_rcvlink(l)) {
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001159 if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf)
Jon Paul Maloy52666982015-10-22 08:51:41 -04001160 return 0;
1161 l->rcv_unacked = 0;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001162
1163 /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */
1164 l->snd_nxt = l->rcv_nxt;
1165 return TIPC_LINK_SND_STATE;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001166 }
1167
1168 /* Unicast ACK */
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001169 l->rcv_unacked = 0;
1170 l->stats.sent_acks++;
1171 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001172 return 0;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001173}
1174
Jon Paul Maloy282b3a02015-10-15 14:52:45 -04001175/* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message
1176 */
1177void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
1178{
1179 int mtyp = RESET_MSG;
Jon Paul Maloy634696b2016-04-15 13:33:03 -04001180 struct sk_buff *skb;
Jon Paul Maloy282b3a02015-10-15 14:52:45 -04001181
1182 if (l->state == LINK_ESTABLISHING)
1183 mtyp = ACTIVATE_MSG;
1184
1185 tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq);
Jon Paul Maloy634696b2016-04-15 13:33:03 -04001186
1187 /* Inform peer that this endpoint is going down if applicable */
1188 skb = skb_peek_tail(xmitq);
1189 if (skb && (l->state == LINK_RESET))
1190 msg_set_peer_stopping(buf_msg(skb), 1);
Jon Paul Maloy282b3a02015-10-15 14:52:45 -04001191}
1192
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001193/* tipc_link_build_nack_msg: prepare link nack message for transmission
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -04001194 * Note that sending of broadcast NACK is coordinated among nodes, to
1195 * reduce the risk of NACK storms towards the sender
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001196 */
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -04001197static int tipc_link_build_nack_msg(struct tipc_link *l,
1198 struct sk_buff_head *xmitq)
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001199{
1200 u32 def_cnt = ++l->stats.deferred_recv;
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -04001201 int match1, match2;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001202
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -04001203 if (link_is_bc_rcvlink(l)) {
1204 match1 = def_cnt & 0xf;
1205 match2 = tipc_own_addr(l->net) & 0xf;
1206 if (match1 == match2)
1207 return TIPC_LINK_SND_STATE;
1208 return 0;
1209 }
Jon Paul Maloy52666982015-10-22 08:51:41 -04001210
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001211 if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV))
1212 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -04001213 return 0;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001214}
1215
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001216/* tipc_link_rcv - process TIPC packets/messages arriving from off-node
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001217 * @l: the link that should handle the message
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001218 * @skb: TIPC packet
1219 * @xmitq: queue to place packets to be sent after this call
1220 */
1221int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
1222 struct sk_buff_head *xmitq)
1223{
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001224 struct sk_buff_head *defq = &l->deferdq;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001225 struct tipc_msg *hdr;
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001226 u16 seqno, rcv_nxt, win_lim;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001227 int rc = 0;
1228
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001229 do {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001230 hdr = buf_msg(skb);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001231 seqno = msg_seqno(hdr);
1232 rcv_nxt = l->rcv_nxt;
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001233 win_lim = rcv_nxt + TIPC_MAX_LINK_WIN;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001234
1235 /* Verify and update link state */
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001236 if (unlikely(msg_user(hdr) == LINK_PROTOCOL))
1237 return tipc_link_proto_rcv(l, skb, xmitq);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001238
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001239 if (unlikely(!link_is_up(l))) {
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001240 if (l->state == LINK_ESTABLISHING)
1241 rc = TIPC_LINK_UP_EVT;
1242 goto drop;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001243 }
1244
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001245 /* Don't send probe at next timeout expiration */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001246 l->silent_intv_cnt = 0;
1247
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001248 /* Drop if outside receive window */
1249 if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) {
1250 l->stats.duplicates++;
1251 goto drop;
1252 }
1253
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001254 /* Forward queues and wake up waiting users */
1255 if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) {
1256 tipc_link_advance_backlog(l, xmitq);
1257 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1258 link_prepare_wakeup(l);
1259 }
1260
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001261 /* Defer delivery if sequence gap */
1262 if (unlikely(seqno != rcv_nxt)) {
Jon Paul Maloy8306f992015-10-15 14:52:43 -04001263 __tipc_skb_queue_sorted(defq, seqno, skb);
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -04001264 rc |= tipc_link_build_nack_msg(l, xmitq);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001265 break;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001266 }
1267
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001268 /* Deliver packet */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001269 l->rcv_nxt++;
Jon Paul Maloy95901122016-11-25 10:35:02 -05001270 l->stats.recv_pkts++;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001271 if (!tipc_data_input(l, skb, l->inputq))
Jon Paul Maloy52666982015-10-22 08:51:41 -04001272 rc |= tipc_link_input(l, skb, l->inputq);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001273 if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN))
Jon Paul Maloy34b9cd62016-04-15 13:33:07 -04001274 rc |= tipc_link_build_state_msg(l, xmitq);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001275 if (unlikely(rc & ~TIPC_LINK_SND_STATE))
Jon Paul Maloy52666982015-10-22 08:51:41 -04001276 break;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001277 } while ((skb = __skb_dequeue(defq)));
1278
1279 return rc;
1280drop:
1281 kfree_skb(skb);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001282 return rc;
1283}
1284
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001285static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
1286 u16 rcvgap, int tolerance, int priority,
1287 struct sk_buff_head *xmitq)
1288{
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001289 struct tipc_link *bcl = l->bc_rcvlink;
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001290 struct sk_buff *skb;
1291 struct tipc_msg *hdr;
1292 struct sk_buff_head *dfq = &l->deferdq;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001293 bool node_up = link_is_up(bcl);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001294 struct tipc_mon_state *mstate = &l->mon_state;
1295 int dlen = 0;
1296 void *data;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001297
1298 /* Don't send protocol message during reset or link failover */
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001299 if (tipc_link_is_blocked(l))
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001300 return;
1301
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001302 if (!tipc_link_is_up(l) && (mtyp == STATE_MSG))
1303 return;
1304
1305 if (!skb_queue_empty(dfq))
1306 rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt;
1307
1308 skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE,
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001309 tipc_max_domain_size, l->addr,
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001310 tipc_own_addr(l->net), 0, 0, 0);
1311 if (!skb)
1312 return;
1313
1314 hdr = buf_msg(skb);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001315 data = msg_data(hdr);
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001316 msg_set_session(hdr, l->session);
1317 msg_set_bearer_id(hdr, l->bearer_id);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001318 msg_set_net_plane(hdr, l->net_plane);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001319 msg_set_next_sent(hdr, l->snd_nxt);
1320 msg_set_ack(hdr, l->rcv_nxt - 1);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001321 msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1);
Jon Paul Maloy06bd2b12016-10-27 18:51:55 -04001322 msg_set_bc_ack_invalid(hdr, !node_up);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001323 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001324 msg_set_link_tolerance(hdr, tolerance);
1325 msg_set_linkprio(hdr, priority);
1326 msg_set_redundant_link(hdr, node_up);
1327 msg_set_seq_gap(hdr, 0);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001328 msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001329
1330 if (mtyp == STATE_MSG) {
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001331 msg_set_seq_gap(hdr, rcvgap);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001332 msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl));
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001333 msg_set_probe(hdr, probe);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001334 tipc_mon_prep(l->net, data, &dlen, mstate, l->bearer_id);
1335 msg_set_size(hdr, INT_H_SIZE + dlen);
1336 skb_trim(skb, INT_H_SIZE + dlen);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001337 l->stats.sent_states++;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001338 l->rcv_unacked = 0;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001339 } else {
1340 /* RESET_MSG or ACTIVATE_MSG */
1341 msg_set_max_pkt(hdr, l->advertised_mtu);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001342 strcpy(data, l->if_name);
1343 msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME);
1344 skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001345 }
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001346 if (probe)
1347 l->stats.sent_probes++;
1348 if (rcvgap)
1349 l->stats.sent_nacks++;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001350 skb->priority = TC_PRIO_CONTROL;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001351 __skb_queue_tail(xmitq, skb);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001352}
Per Lidenb97bf3f2006-01-02 19:04:38 +01001353
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001354/* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001355 * with contents of the link's transmit and backlog queues.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001356 */
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001357void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
1358 int mtyp, struct sk_buff_head *xmitq)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001359{
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001360 struct sk_buff *skb, *tnlskb;
1361 struct tipc_msg *hdr, tnlhdr;
1362 struct sk_buff_head *queue = &l->transmq;
1363 struct sk_buff_head tmpxq, tnlq;
1364 u16 pktlen, pktcnt, seqno = l->snd_nxt;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001365
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001366 if (!tnl)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001367 return;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001368
1369 skb_queue_head_init(&tnlq);
1370 skb_queue_head_init(&tmpxq);
1371
1372 /* At least one packet required for safe algorithm => add dummy */
1373 skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001374 BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net),
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001375 0, 0, TIPC_ERR_NO_PORT);
Ying Xuea6ca1092014-11-26 11:41:55 +08001376 if (!skb) {
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001377 pr_warn("%sunable to create tunnel packet\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001378 return;
Allan Stephens5392d642006-06-25 23:52:50 -07001379 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001380 skb_queue_tail(&tnlq, skb);
1381 tipc_link_xmit(l, &tnlq, &tmpxq);
1382 __skb_queue_purge(&tmpxq);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001383
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001384 /* Initialize reusable tunnel packet header */
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001385 tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL,
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001386 mtyp, INT_H_SIZE, l->addr);
1387 pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq);
1388 msg_set_msgcnt(&tnlhdr, pktcnt);
1389 msg_set_bearer_id(&tnlhdr, l->peer_bearer_id);
1390tnl:
1391 /* Wrap each packet into a tunnel packet */
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -04001392 skb_queue_walk(queue, skb) {
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001393 hdr = buf_msg(skb);
1394 if (queue == &l->backlogq)
1395 msg_set_seqno(hdr, seqno++);
1396 pktlen = msg_size(hdr);
1397 msg_set_size(&tnlhdr, pktlen + INT_H_SIZE);
1398 tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE);
1399 if (!tnlskb) {
1400 pr_warn("%sunable to send packet\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001401 return;
1402 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001403 skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE);
1404 skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen);
1405 __skb_queue_tail(&tnlq, tnlskb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001406 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001407 if (queue != &l->backlogq) {
1408 queue = &l->backlogq;
1409 goto tnl;
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -04001410 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001411
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001412 tipc_link_xmit(tnl, &tnlq, xmitq);
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001413
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001414 if (mtyp == FAILOVER_MSG) {
1415 tnl->drop_point = l->rcv_nxt;
1416 tnl->failover_reasm_skb = l->reasm_buf;
1417 l->reasm_buf = NULL;
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001418 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001419}
1420
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001421/* tipc_link_proto_rcv(): receive link level protocol message :
1422 * Note that network plane id propagates through the network, and may
1423 * change at any time. The node with lowest numerical id determines
1424 * network plane
1425 */
1426static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
1427 struct sk_buff_head *xmitq)
1428{
1429 struct tipc_msg *hdr = buf_msg(skb);
1430 u16 rcvgap = 0;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001431 u16 ack = msg_ack(hdr);
1432 u16 gap = msg_seq_gap(hdr);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001433 u16 peers_snd_nxt = msg_next_sent(hdr);
1434 u16 peers_tol = msg_link_tolerance(hdr);
1435 u16 peers_prio = msg_linkprio(hdr);
Jon Paul Maloy2be80c22015-08-20 02:12:56 -04001436 u16 rcv_nxt = l->rcv_nxt;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001437 u16 dlen = msg_data_sz(hdr);
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001438 int mtyp = msg_type(hdr);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001439 void *data;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001440 char *if_name;
1441 int rc = 0;
1442
Jon Paul Maloy52666982015-10-22 08:51:41 -04001443 if (tipc_link_is_blocked(l) || !xmitq)
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001444 goto exit;
1445
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001446 if (tipc_own_addr(l->net) > msg_prevnode(hdr))
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001447 l->net_plane = msg_net_plane(hdr);
1448
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001449 skb_linearize(skb);
1450 hdr = buf_msg(skb);
1451 data = msg_data(hdr);
1452
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001453 switch (mtyp) {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001454 case RESET_MSG:
1455
1456 /* Ignore duplicate RESET with old session number */
1457 if ((less_eq(msg_session(hdr), l->peer_session)) &&
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001458 (l->peer_session != ANY_SESSION))
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001459 break;
1460 /* fall thru' */
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001461
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001462 case ACTIVATE_MSG:
1463
1464 /* Complete own link name with peer's interface name */
1465 if_name = strrchr(l->name, ':') + 1;
1466 if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME)
1467 break;
1468 if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
1469 break;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001470 strncpy(if_name, data, TIPC_MAX_IF_NAME);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001471
1472 /* Update own tolerance if peer indicates a non-zero value */
1473 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
1474 l->tolerance = peers_tol;
1475
1476 /* Update own priority if peer's priority is higher */
1477 if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
1478 l->priority = peers_prio;
1479
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001480 /* ACTIVATE_MSG serves as PEER_RESET if link is already down */
Jon Paul Maloy634696b2016-04-15 13:33:03 -04001481 if (msg_peer_stopping(hdr))
1482 rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1483 else if ((mtyp == RESET_MSG) || !link_is_up(l))
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001484 rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
1485
1486 /* ACTIVATE_MSG takes up link if it was already locally reset */
1487 if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING))
1488 rc = TIPC_LINK_UP_EVT;
1489
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001490 l->peer_session = msg_session(hdr);
1491 l->peer_bearer_id = msg_bearer_id(hdr);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001492 if (l->mtu > msg_max_pkt(hdr))
1493 l->mtu = msg_max_pkt(hdr);
1494 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001495
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001496 case STATE_MSG:
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001497
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001498 /* Update own tolerance if peer indicates a non-zero value */
1499 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
1500 l->tolerance = peers_tol;
1501
Jon Paul Maloyf7967552016-11-23 21:05:26 -05001502 /* Update own prio if peer indicates a different value */
1503 if ((peers_prio != l->priority) &&
1504 in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) {
Richard Alpe81729812016-02-01 08:19:57 +01001505 l->priority = peers_prio;
1506 rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1507 }
1508
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001509 l->silent_intv_cnt = 0;
1510 l->stats.recv_states++;
1511 if (msg_probe(hdr))
1512 l->stats.recv_probes++;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001513
1514 if (!link_is_up(l)) {
1515 if (l->state == LINK_ESTABLISHING)
1516 rc = TIPC_LINK_UP_EVT;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001517 break;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001518 }
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001519 tipc_mon_rcv(l->net, data, dlen, l->addr,
1520 &l->mon_state, l->bearer_id);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001521
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001522 /* Send NACK if peer has sent pkts we haven't received yet */
Jon Paul Maloy2be80c22015-08-20 02:12:56 -04001523 if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l))
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001524 rcvgap = peers_snd_nxt - l->rcv_nxt;
1525 if (rcvgap || (msg_probe(hdr)))
1526 tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap,
Jon Paul Maloy16040892015-07-21 06:42:28 -04001527 0, 0, xmitq);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001528 tipc_link_release_pkts(l, ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001529
1530 /* If NACK, retransmit will now start at right position */
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001531 if (gap) {
1532 rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001533 l->stats.recv_nacks++;
1534 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001535
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001536 tipc_link_advance_backlog(l, xmitq);
1537 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1538 link_prepare_wakeup(l);
1539 }
1540exit:
1541 kfree_skb(skb);
1542 return rc;
1543}
1544
Jon Paul Maloy52666982015-10-22 08:51:41 -04001545/* tipc_link_build_bc_proto_msg() - create broadcast protocol message
1546 */
1547static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast,
1548 u16 peers_snd_nxt,
1549 struct sk_buff_head *xmitq)
1550{
1551 struct sk_buff *skb;
1552 struct tipc_msg *hdr;
1553 struct sk_buff *dfrd_skb = skb_peek(&l->deferdq);
1554 u16 ack = l->rcv_nxt - 1;
1555 u16 gap_to = peers_snd_nxt - 1;
1556
1557 skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001558 0, l->addr, tipc_own_addr(l->net), 0, 0, 0);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001559 if (!skb)
1560 return false;
1561 hdr = buf_msg(skb);
1562 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
1563 msg_set_bcast_ack(hdr, ack);
1564 msg_set_bcgap_after(hdr, ack);
1565 if (dfrd_skb)
1566 gap_to = buf_seqno(dfrd_skb) - 1;
1567 msg_set_bcgap_to(hdr, gap_to);
1568 msg_set_non_seq(hdr, bcast);
1569 __skb_queue_tail(xmitq, skb);
1570 return true;
1571}
1572
1573/* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints.
1574 *
1575 * Give a newly added peer node the sequence number where it should
1576 * start receiving and acking broadcast packets.
1577 */
Wu Fengguang742e0382015-10-24 22:56:01 +08001578static void tipc_link_build_bc_init_msg(struct tipc_link *l,
1579 struct sk_buff_head *xmitq)
Jon Paul Maloy52666982015-10-22 08:51:41 -04001580{
1581 struct sk_buff_head list;
1582
1583 __skb_queue_head_init(&list);
1584 if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list))
1585 return;
Jon Paul Maloy06bd2b12016-10-27 18:51:55 -04001586 msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001587 tipc_link_xmit(l, &list, xmitq);
1588}
1589
1590/* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer
1591 */
1592void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr)
1593{
1594 int mtyp = msg_type(hdr);
1595 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
1596
1597 if (link_is_up(l))
1598 return;
1599
1600 if (msg_user(hdr) == BCAST_PROTOCOL) {
1601 l->rcv_nxt = peers_snd_nxt;
1602 l->state = LINK_ESTABLISHED;
1603 return;
1604 }
1605
1606 if (l->peer_caps & TIPC_BCAST_SYNCH)
1607 return;
1608
1609 if (msg_peer_node_is_up(hdr))
1610 return;
1611
1612 /* Compatibility: accept older, less safe initial synch data */
1613 if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG))
1614 l->rcv_nxt = peers_snd_nxt;
1615}
1616
Jon Paul Maloy7c4a54b2016-09-01 13:52:50 -04001617/* link_bc_retr eval()- check if the indicated range can be retransmitted now
1618 * - Adjust permitted range if there is overlap with previous retransmission
1619 */
1620static bool link_bc_retr_eval(struct tipc_link *l, u16 *from, u16 *to)
1621{
1622 unsigned long elapsed = jiffies_to_msecs(jiffies - l->prev_retr);
1623
1624 if (less(*to, *from))
1625 return false;
1626
1627 /* New retransmission request */
1628 if ((elapsed > TIPC_BC_RETR_LIMIT) ||
1629 less(*to, l->prev_from) || more(*from, l->prev_to)) {
1630 l->prev_from = *from;
1631 l->prev_to = *to;
1632 l->prev_retr = jiffies;
1633 return true;
1634 }
1635
1636 /* Inside range of previous retransmit */
1637 if (!less(*from, l->prev_from) && !more(*to, l->prev_to))
1638 return false;
1639
1640 /* Fully or partially outside previous range => exclude overlap */
1641 if (less(*from, l->prev_from)) {
1642 *to = l->prev_from - 1;
1643 l->prev_from = *from;
1644 }
1645 if (more(*to, l->prev_to)) {
1646 *from = l->prev_to + 1;
1647 l->prev_to = *to;
1648 }
1649 l->prev_retr = jiffies;
1650 return true;
1651}
1652
Jon Paul Maloy52666982015-10-22 08:51:41 -04001653/* tipc_link_bc_sync_rcv - update rcv link according to peer's send state
1654 */
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001655int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
1656 struct sk_buff_head *xmitq)
Jon Paul Maloy52666982015-10-22 08:51:41 -04001657{
Jon Paul Maloy7c4a54b2016-09-01 13:52:50 -04001658 struct tipc_link *snd_l = l->bc_sndlink;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001659 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001660 u16 from = msg_bcast_ack(hdr) + 1;
1661 u16 to = from + msg_bc_gap(hdr) - 1;
1662 int rc = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001663
1664 if (!link_is_up(l))
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001665 return rc;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001666
1667 if (!msg_peer_node_is_up(hdr))
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001668 return rc;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001669
Jon Paul Maloy2d18ac42016-07-11 16:08:35 -04001670 /* Open when peer ackowledges our bcast init msg (pkt #1) */
1671 if (msg_ack(hdr))
1672 l->bc_peer_is_up = true;
1673
1674 if (!l->bc_peer_is_up)
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001675 return rc;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001676
Jon Paul Maloy7c4a54b2016-09-01 13:52:50 -04001677 l->stats.recv_nacks++;
1678
Jon Paul Maloy52666982015-10-22 08:51:41 -04001679 /* Ignore if peers_snd_nxt goes beyond receive window */
1680 if (more(peers_snd_nxt, l->rcv_nxt + l->window))
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001681 return rc;
1682
Jon Paul Maloy7c4a54b2016-09-01 13:52:50 -04001683 if (link_bc_retr_eval(snd_l, &from, &to))
1684 rc = tipc_link_retrans(snd_l, from, to, xmitq);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001685
1686 l->snd_nxt = peers_snd_nxt;
1687 if (link_bc_rcv_gap(l))
1688 rc |= TIPC_LINK_SND_STATE;
1689
1690 /* Return now if sender supports nack via STATE messages */
1691 if (l->peer_caps & TIPC_BCAST_STATE_NACK)
1692 return rc;
1693
1694 /* Otherwise, be backwards compatible */
Jon Paul Maloy52666982015-10-22 08:51:41 -04001695
1696 if (!more(peers_snd_nxt, l->rcv_nxt)) {
1697 l->nack_state = BC_NACK_SND_CONDITIONAL;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001698 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001699 }
1700
1701 /* Don't NACK if one was recently sent or peeked */
1702 if (l->nack_state == BC_NACK_SND_SUPPRESS) {
1703 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001704 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001705 }
1706
1707 /* Conditionally delay NACK sending until next synch rcv */
1708 if (l->nack_state == BC_NACK_SND_CONDITIONAL) {
1709 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
1710 if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN)
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001711 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001712 }
1713
1714 /* Send NACK now but suppress next one */
1715 tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq);
1716 l->nack_state = BC_NACK_SND_SUPPRESS;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001717 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001718}
1719
1720void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked,
1721 struct sk_buff_head *xmitq)
1722{
1723 struct sk_buff *skb, *tmp;
1724 struct tipc_link *snd_l = l->bc_sndlink;
1725
1726 if (!link_is_up(l) || !l->bc_peer_is_up)
1727 return;
1728
1729 if (!more(acked, l->acked))
1730 return;
1731
1732 /* Skip over packets peer has already acked */
1733 skb_queue_walk(&snd_l->transmq, skb) {
1734 if (more(buf_seqno(skb), l->acked))
1735 break;
1736 }
1737
1738 /* Update/release the packets peer is acking now */
1739 skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) {
1740 if (more(buf_seqno(skb), acked))
1741 break;
1742 if (!--TIPC_SKB_CB(skb)->ackers) {
1743 __skb_unlink(skb, &snd_l->transmq);
1744 kfree_skb(skb);
1745 }
1746 }
1747 l->acked = acked;
1748 tipc_link_advance_backlog(snd_l, xmitq);
1749 if (unlikely(!skb_queue_empty(&snd_l->wakeupq)))
1750 link_prepare_wakeup(snd_l);
1751}
1752
1753/* tipc_link_bc_nack_rcv(): receive broadcast nack message
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001754 * This function is here for backwards compatibility, since
1755 * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5.
Jon Paul Maloy52666982015-10-22 08:51:41 -04001756 */
1757int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
1758 struct sk_buff_head *xmitq)
1759{
1760 struct tipc_msg *hdr = buf_msg(skb);
1761 u32 dnode = msg_destnode(hdr);
1762 int mtyp = msg_type(hdr);
1763 u16 acked = msg_bcast_ack(hdr);
1764 u16 from = acked + 1;
1765 u16 to = msg_bcgap_to(hdr);
1766 u16 peers_snd_nxt = to + 1;
1767 int rc = 0;
1768
1769 kfree_skb(skb);
1770
1771 if (!tipc_link_is_up(l) || !l->bc_peer_is_up)
1772 return 0;
1773
1774 if (mtyp != STATE_MSG)
1775 return 0;
1776
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001777 if (dnode == tipc_own_addr(l->net)) {
Jon Paul Maloy52666982015-10-22 08:51:41 -04001778 tipc_link_bc_ack_rcv(l, acked, xmitq);
1779 rc = tipc_link_retrans(l->bc_sndlink, from, to, xmitq);
1780 l->stats.recv_nacks++;
1781 return rc;
1782 }
1783
1784 /* Msg for other node => suppress own NACK at next sync if applicable */
1785 if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from))
1786 l->nack_state = BC_NACK_SND_SUPPRESS;
1787
1788 return 0;
1789}
1790
Jon Paul Maloye3eea1e2015-03-13 16:08:11 -04001791void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001792{
Jon Paul Maloyed193ec2015-04-02 09:33:02 -04001793 int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE);
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -04001794
Jon Paul Maloye3eea1e2015-03-13 16:08:11 -04001795 l->window = win;
Jon Paul Maloy5a0950c2016-08-16 11:53:51 -04001796 l->backlog[TIPC_LOW_IMPORTANCE].limit = max_t(u16, 50, win);
1797 l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = max_t(u16, 100, win * 2);
1798 l->backlog[TIPC_HIGH_IMPORTANCE].limit = max_t(u16, 150, win * 3);
1799 l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = max_t(u16, 200, win * 4);
Jon Paul Maloy1f66d162015-03-25 12:07:24 -04001800 l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001801}
1802
Allan Stephens5c216e12011-10-18 11:34:29 -04001803/**
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001804 * link_reset_stats - reset link statistics
Jon Paul Maloy1a906322015-11-19 14:30:47 -05001805 * @l: pointer to link
Per Lidenb97bf3f2006-01-02 19:04:38 +01001806 */
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001807void tipc_link_reset_stats(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001808{
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001809 memset(&l->stats, 0, sizeof(l->stats));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001810}
1811
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001812static void link_print(struct tipc_link *l, const char *str)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001813{
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001814 struct sk_buff *hskb = skb_peek(&l->transmq);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001815 u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1;
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001816 u16 tail = l->snd_nxt - 1;
Ying Xue7a2f7d12014-04-21 10:55:46 +08001817
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001818 pr_info("%s Link <%s> state %x\n", str, l->name, l->state);
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001819 pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n",
1820 skb_queue_len(&l->transmq), head, tail,
1821 skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001822}
Richard Alpe0655f6a2014-11-20 10:29:07 +01001823
1824/* Parse and validate nested (link) properties valid for media, bearer and link
1825 */
1826int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
1827{
1828 int err;
1829
1830 err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop,
1831 tipc_nl_prop_policy);
1832 if (err)
1833 return err;
1834
1835 if (props[TIPC_NLA_PROP_PRIO]) {
1836 u32 prio;
1837
1838 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1839 if (prio > TIPC_MAX_LINK_PRI)
1840 return -EINVAL;
1841 }
1842
1843 if (props[TIPC_NLA_PROP_TOL]) {
1844 u32 tol;
1845
1846 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1847 if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
1848 return -EINVAL;
1849 }
1850
1851 if (props[TIPC_NLA_PROP_WIN]) {
1852 u32 win;
1853
1854 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1855 if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN))
1856 return -EINVAL;
1857 }
1858
1859 return 0;
1860}
Richard Alpe7be57fc2014-11-20 10:29:12 +01001861
Richard Alped8182802014-11-24 11:10:29 +01001862static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
Richard Alpe7be57fc2014-11-20 10:29:12 +01001863{
1864 int i;
1865 struct nlattr *stats;
1866
1867 struct nla_map {
1868 u32 key;
1869 u32 val;
1870 };
1871
1872 struct nla_map map[] = {
Jon Paul Maloy95901122016-11-25 10:35:02 -05001873 {TIPC_NLA_STATS_RX_INFO, 0},
Richard Alpe7be57fc2014-11-20 10:29:12 +01001874 {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments},
1875 {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented},
1876 {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles},
1877 {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled},
Jon Paul Maloy95901122016-11-25 10:35:02 -05001878 {TIPC_NLA_STATS_TX_INFO, 0},
Richard Alpe7be57fc2014-11-20 10:29:12 +01001879 {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments},
1880 {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented},
1881 {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles},
1882 {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled},
1883 {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ?
1884 s->msg_length_counts : 1},
1885 {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts},
1886 {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total},
1887 {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]},
1888 {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]},
1889 {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]},
1890 {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]},
1891 {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]},
1892 {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]},
1893 {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]},
1894 {TIPC_NLA_STATS_RX_STATES, s->recv_states},
1895 {TIPC_NLA_STATS_RX_PROBES, s->recv_probes},
1896 {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks},
1897 {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv},
1898 {TIPC_NLA_STATS_TX_STATES, s->sent_states},
1899 {TIPC_NLA_STATS_TX_PROBES, s->sent_probes},
1900 {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks},
1901 {TIPC_NLA_STATS_TX_ACKS, s->sent_acks},
1902 {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted},
1903 {TIPC_NLA_STATS_DUPLICATES, s->duplicates},
1904 {TIPC_NLA_STATS_LINK_CONGS, s->link_congs},
1905 {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz},
1906 {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ?
1907 (s->accu_queue_sz / s->queue_sz_counts) : 0}
1908 };
1909
1910 stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
1911 if (!stats)
1912 return -EMSGSIZE;
1913
1914 for (i = 0; i < ARRAY_SIZE(map); i++)
1915 if (nla_put_u32(skb, map[i].key, map[i].val))
1916 goto msg_full;
1917
1918 nla_nest_end(skb, stats);
1919
1920 return 0;
1921msg_full:
1922 nla_nest_cancel(skb, stats);
1923
1924 return -EMSGSIZE;
1925}
1926
1927/* Caller should hold appropriate locks to protect the link */
Jon Paul Maloy5be9c082015-11-19 14:30:45 -05001928int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
1929 struct tipc_link *link, int nlflags)
Richard Alpe7be57fc2014-11-20 10:29:12 +01001930{
1931 int err;
1932 void *hdr;
1933 struct nlattr *attrs;
1934 struct nlattr *prop;
Ying Xue34747532015-01-09 15:27:10 +08001935 struct tipc_net *tn = net_generic(net, tipc_net_id);
Richard Alpe7be57fc2014-11-20 10:29:12 +01001936
Richard Alpebfb3e5d2015-02-09 09:50:03 +01001937 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
Nicolas Dichtelf2f67392015-04-28 18:33:50 +02001938 nlflags, TIPC_NL_LINK_GET);
Richard Alpe7be57fc2014-11-20 10:29:12 +01001939 if (!hdr)
1940 return -EMSGSIZE;
1941
1942 attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
1943 if (!attrs)
1944 goto msg_full;
1945
1946 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name))
1947 goto attr_msg_full;
1948 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST,
Ying Xue34747532015-01-09 15:27:10 +08001949 tipc_cluster_mask(tn->own_addr)))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001950 goto attr_msg_full;
Jon Paul Maloyed193ec2015-04-02 09:33:02 -04001951 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001952 goto attr_msg_full;
Jon Paul Maloy95901122016-11-25 10:35:02 -05001953 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001954 goto attr_msg_full;
Jon Paul Maloy95901122016-11-25 10:35:02 -05001955 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001956 goto attr_msg_full;
1957
1958 if (tipc_link_is_up(link))
1959 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
1960 goto attr_msg_full;
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001961 if (link->active)
Richard Alpe7be57fc2014-11-20 10:29:12 +01001962 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE))
1963 goto attr_msg_full;
1964
1965 prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
1966 if (!prop)
1967 goto attr_msg_full;
1968 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
1969 goto prop_msg_full;
1970 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance))
1971 goto prop_msg_full;
1972 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN,
Jon Paul Maloy1f66d162015-03-25 12:07:24 -04001973 link->window))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001974 goto prop_msg_full;
1975 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
1976 goto prop_msg_full;
1977 nla_nest_end(msg->skb, prop);
1978
1979 err = __tipc_nl_add_stats(msg->skb, &link->stats);
1980 if (err)
1981 goto attr_msg_full;
1982
1983 nla_nest_end(msg->skb, attrs);
1984 genlmsg_end(msg->skb, hdr);
1985
1986 return 0;
1987
1988prop_msg_full:
1989 nla_nest_cancel(msg->skb, prop);
1990attr_msg_full:
1991 nla_nest_cancel(msg->skb, attrs);
1992msg_full:
1993 genlmsg_cancel(msg->skb, hdr);
1994
1995 return -EMSGSIZE;
1996}
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001997
1998static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb,
1999 struct tipc_stats *stats)
2000{
2001 int i;
2002 struct nlattr *nest;
2003
2004 struct nla_map {
2005 __u32 key;
2006 __u32 val;
2007 };
2008
2009 struct nla_map map[] = {
Jon Paul Maloy95901122016-11-25 10:35:02 -05002010 {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts},
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002011 {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments},
2012 {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented},
2013 {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles},
2014 {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled},
Jon Paul Maloy95901122016-11-25 10:35:02 -05002015 {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts},
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002016 {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments},
2017 {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented},
2018 {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles},
2019 {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled},
2020 {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks},
2021 {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv},
2022 {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks},
2023 {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks},
2024 {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted},
2025 {TIPC_NLA_STATS_DUPLICATES, stats->duplicates},
2026 {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs},
2027 {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz},
2028 {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ?
2029 (stats->accu_queue_sz / stats->queue_sz_counts) : 0}
2030 };
2031
2032 nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
2033 if (!nest)
2034 return -EMSGSIZE;
2035
2036 for (i = 0; i < ARRAY_SIZE(map); i++)
2037 if (nla_put_u32(skb, map[i].key, map[i].val))
2038 goto msg_full;
2039
2040 nla_nest_end(skb, nest);
2041
2042 return 0;
2043msg_full:
2044 nla_nest_cancel(skb, nest);
2045
2046 return -EMSGSIZE;
2047}
2048
2049int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg)
2050{
2051 int err;
2052 void *hdr;
2053 struct nlattr *attrs;
2054 struct nlattr *prop;
2055 struct tipc_net *tn = net_generic(net, tipc_net_id);
2056 struct tipc_link *bcl = tn->bcl;
2057
2058 if (!bcl)
2059 return 0;
2060
2061 tipc_bcast_lock(net);
2062
2063 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2064 NLM_F_MULTI, TIPC_NL_LINK_GET);
Insu Yunb53ce3e2016-02-17 11:47:35 -05002065 if (!hdr) {
2066 tipc_bcast_unlock(net);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002067 return -EMSGSIZE;
Insu Yunb53ce3e2016-02-17 11:47:35 -05002068 }
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002069
2070 attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
2071 if (!attrs)
2072 goto msg_full;
2073
2074 /* The broadcast link is always up */
2075 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
2076 goto attr_msg_full;
2077
2078 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST))
2079 goto attr_msg_full;
2080 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name))
2081 goto attr_msg_full;
Jon Paul Maloy95901122016-11-25 10:35:02 -05002082 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0))
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002083 goto attr_msg_full;
Jon Paul Maloy95901122016-11-25 10:35:02 -05002084 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0))
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002085 goto attr_msg_full;
2086
2087 prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
2088 if (!prop)
2089 goto attr_msg_full;
2090 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window))
2091 goto prop_msg_full;
2092 nla_nest_end(msg->skb, prop);
2093
2094 err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats);
2095 if (err)
2096 goto attr_msg_full;
2097
2098 tipc_bcast_unlock(net);
2099 nla_nest_end(msg->skb, attrs);
2100 genlmsg_end(msg->skb, hdr);
2101
2102 return 0;
2103
2104prop_msg_full:
2105 nla_nest_cancel(msg->skb, prop);
2106attr_msg_full:
2107 nla_nest_cancel(msg->skb, attrs);
2108msg_full:
2109 tipc_bcast_unlock(net);
2110 genlmsg_cancel(msg->skb, hdr);
2111
2112 return -EMSGSIZE;
2113}
2114
Richard Alped01332f2016-02-01 08:19:56 +01002115void tipc_link_set_tolerance(struct tipc_link *l, u32 tol,
2116 struct sk_buff_head *xmitq)
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002117{
2118 l->tolerance = tol;
Richard Alped01332f2016-02-01 08:19:56 +01002119 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, tol, 0, xmitq);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002120}
2121
Richard Alped01332f2016-02-01 08:19:56 +01002122void tipc_link_set_prio(struct tipc_link *l, u32 prio,
2123 struct sk_buff_head *xmitq)
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002124{
2125 l->priority = prio;
Richard Alped01332f2016-02-01 08:19:56 +01002126 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, prio, xmitq);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002127}
2128
2129void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit)
2130{
2131 l->abort_limit = limit;
2132}