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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 Maloyc1336ee2015-03-13 16:08:08 -04004 * Copyright (c) 1996-2007, 2012-2015, 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"
Per Lidenb97bf3f2006-01-02 19:04:38 +010045
Ying Xue796c75d2013-06-17 10:54:48 -040046#include <linux/pkt_sched.h>
47
Jon Paul Maloy38206d52015-11-19 14:30:46 -050048struct tipc_stats {
49 u32 sent_info; /* used in counting # sent packets */
50 u32 recv_info; /* used in counting # recv'd packets */
51 u32 sent_states;
52 u32 recv_states;
53 u32 sent_probes;
54 u32 recv_probes;
55 u32 sent_nacks;
56 u32 recv_nacks;
57 u32 sent_acks;
58 u32 sent_bundled;
59 u32 sent_bundles;
60 u32 recv_bundled;
61 u32 recv_bundles;
62 u32 retransmitted;
63 u32 sent_fragmented;
64 u32 sent_fragments;
65 u32 recv_fragmented;
66 u32 recv_fragments;
67 u32 link_congs; /* # port sends blocked by congestion */
68 u32 deferred_recv;
69 u32 duplicates;
70 u32 max_queue_sz; /* send queue size high water mark */
71 u32 accu_queue_sz; /* used for send queue size profiling */
72 u32 queue_sz_counts; /* used for send queue size profiling */
73 u32 msg_length_counts; /* used for message length profiling */
74 u32 msg_lengths_total; /* used for message length profiling */
75 u32 msg_length_profile[7]; /* used for msg. length profiling */
76};
77
78/**
79 * struct tipc_link - TIPC link data structure
80 * @addr: network address of link's peer node
81 * @name: link name character string
82 * @media_addr: media address to use when sending messages over link
83 * @timer: link timer
84 * @net: pointer to namespace struct
85 * @refcnt: reference counter for permanent references (owner node & timer)
86 * @peer_session: link session # being used by peer end of link
87 * @peer_bearer_id: bearer id used by link's peer endpoint
88 * @bearer_id: local bearer id used by link
89 * @tolerance: minimum link continuity loss needed to reset link [in ms]
90 * @keepalive_intv: link keepalive timer interval
91 * @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')
99 * @backlog_limit: backlog queue congestion thresholds (indexed by importance)
100 * @exp_msg_count: # of tunnelled messages expected during link changeover
101 * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset
102 * @mtu: current maximum packet size for this link
103 * @advertised_mtu: advertised own mtu when link is being established
104 * @transmitq: queue for sent, non-acked messages
105 * @backlogq: queue for messages waiting to be sent
106 * @snt_nxt: next sequence number to use for outbound messages
107 * @last_retransmitted: sequence number of most recently retransmitted message
108 * @stale_count: # of identical retransmit requests made by peer
109 * @ackers: # of peers that needs to ack each packet before it can be released
110 * @acked: # last packet acked by a certain peer. Used for broadcast.
111 * @rcv_nxt: next sequence number to expect for inbound messages
112 * @deferred_queue: deferred queue saved OOS b'cast message received from node
113 * @unacked_window: # of inbound messages rx'd without ack'ing back to peer
114 * @inputq: buffer queue for messages to be delivered upwards
115 * @namedq: buffer queue for name table messages to be delivered upwards
116 * @next_out: ptr to first unsent outbound message in queue
117 * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate
118 * @long_msg_seq_no: next identifier to use for outbound fragmented messages
119 * @reasm_buf: head of partially reassembled inbound message fragments
120 * @bc_rcvr: marks that this is a broadcast receiver link
121 * @stats: collects statistics regarding link activity
122 */
123struct tipc_link {
124 u32 addr;
125 char name[TIPC_MAX_LINK_NAME];
126 struct tipc_media_addr *media_addr;
127 struct net *net;
128
129 /* Management and link supervision data */
130 u32 peer_session;
131 u32 peer_bearer_id;
132 u32 bearer_id;
133 u32 tolerance;
134 unsigned long keepalive_intv;
135 u32 abort_limit;
136 u32 state;
137 u16 peer_caps;
138 bool active;
139 u32 silent_intv_cnt;
140 struct {
141 unchar hdr[INT_H_SIZE];
142 unchar body[TIPC_MAX_IF_NAME];
143 } proto_msg;
144 struct tipc_msg *pmsg;
145 u32 priority;
146 char net_plane;
147
148 /* Failover/synch */
149 u16 drop_point;
150 struct sk_buff *failover_reasm_skb;
151
152 /* Max packet negotiation */
153 u16 mtu;
154 u16 advertised_mtu;
155
156 /* Sending */
157 struct sk_buff_head transmq;
158 struct sk_buff_head backlogq;
159 struct {
160 u16 len;
161 u16 limit;
162 } backlog[5];
163 u16 snd_nxt;
164 u16 last_retransm;
165 u16 window;
166 u32 stale_count;
167
168 /* Reception */
169 u16 rcv_nxt;
170 u32 rcv_unacked;
171 struct sk_buff_head deferdq;
172 struct sk_buff_head *inputq;
173 struct sk_buff_head *namedq;
174
175 /* Congestion handling */
176 struct sk_buff_head wakeupq;
177
178 /* Fragmentation/reassembly */
179 struct sk_buff *reasm_buf;
180
181 /* Broadcast */
182 u16 ackers;
183 u16 acked;
184 struct tipc_link *bc_rcvlink;
185 struct tipc_link *bc_sndlink;
186 int nack_state;
187 bool bc_peer_is_up;
188
189 /* Statistics */
190 struct tipc_stats stats;
191};
192
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400193/*
194 * Error message prefixes
195 */
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400196static const char *link_co_err = "Link tunneling error, ";
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400197static const char *link_rst_msg = "Resetting link ";
Richard Alpe7be57fc2014-11-20 10:29:12 +0100198
Richard Alpe0655f6a2014-11-20 10:29:07 +0100199/* Properties valid for media, bearar and link */
200static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
201 [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC },
202 [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 },
203 [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 },
204 [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 }
205};
206
Jon Paul Maloy52666982015-10-22 08:51:41 -0400207/* Send states for broadcast NACKs
208 */
209enum {
210 BC_NACK_SND_CONDITIONAL,
211 BC_NACK_SND_UNCONDITIONAL,
212 BC_NACK_SND_SUPPRESS,
213};
214
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900215/*
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400216 * Interval between NACKs when packets arrive out of order
217 */
218#define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2)
219/*
Allan Stephensa686e682008-06-04 17:29:39 -0700220 * Out-of-range value for link session numbers
221 */
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400222#define WILDCARD_SESSION 0x10000
Allan Stephensa686e682008-06-04 17:29:39 -0700223
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400224/* Link FSM states:
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400225 */
226enum {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400227 LINK_ESTABLISHED = 0xe,
228 LINK_ESTABLISHING = 0xe << 4,
229 LINK_RESET = 0x1 << 8,
230 LINK_RESETTING = 0x2 << 12,
231 LINK_PEER_RESET = 0xd << 16,
232 LINK_FAILINGOVER = 0xf << 20,
233 LINK_SYNCHING = 0xc << 24
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400234};
235
236/* Link FSM state checking routines
237 */
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400238static int link_is_up(struct tipc_link *l)
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400239{
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400240 return l->state & (LINK_ESTABLISHED | LINK_SYNCHING);
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400241}
242
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400243static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
244 struct sk_buff_head *xmitq);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -0400245static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
246 u16 rcvgap, int tolerance, int priority,
247 struct sk_buff_head *xmitq);
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500248static void link_print(struct tipc_link *l, const char *str);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400249static void tipc_link_build_nack_msg(struct tipc_link *l,
250 struct sk_buff_head *xmitq);
251static void tipc_link_build_bc_init_msg(struct tipc_link *l,
252 struct sk_buff_head *xmitq);
253static bool tipc_link_release_pkts(struct tipc_link *l, u16 to);
Jon Paul Maloy8b4ed862015-03-25 12:07:26 -0400254
Per Lidenb97bf3f2006-01-02 19:04:38 +0100255/*
Sam Ravnborg05790c62006-03-20 22:37:04 -0800256 * Simple non-static link routines (i.e. referenced outside this file)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100257 */
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400258bool tipc_link_is_up(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100259{
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400260 return link_is_up(l);
261}
262
Jon Paul Maloyc8199302015-10-15 14:52:46 -0400263bool tipc_link_peer_is_down(struct tipc_link *l)
264{
265 return l->state == LINK_PEER_RESET;
266}
267
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400268bool tipc_link_is_reset(struct tipc_link *l)
269{
270 return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING);
271}
272
Jon Paul Maloy73f646c2015-10-15 14:52:44 -0400273bool tipc_link_is_establishing(struct tipc_link *l)
274{
275 return l->state == LINK_ESTABLISHING;
276}
277
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400278bool tipc_link_is_synching(struct tipc_link *l)
279{
280 return l->state == LINK_SYNCHING;
281}
282
283bool tipc_link_is_failingover(struct tipc_link *l)
284{
285 return l->state == LINK_FAILINGOVER;
286}
287
288bool tipc_link_is_blocked(struct tipc_link *l)
289{
290 return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100291}
292
Wu Fengguang742e0382015-10-24 22:56:01 +0800293static bool link_is_bc_sndlink(struct tipc_link *l)
Jon Paul Maloy52666982015-10-22 08:51:41 -0400294{
295 return !l->bc_sndlink;
296}
297
Wu Fengguang742e0382015-10-24 22:56:01 +0800298static bool link_is_bc_rcvlink(struct tipc_link *l)
Jon Paul Maloy52666982015-10-22 08:51:41 -0400299{
300 return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l));
301}
302
Jon Paul Maloy9d13ec62015-07-16 16:54:19 -0400303int tipc_link_is_active(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100304{
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400305 return l->active;
306}
Jon Paul Maloy9d13ec62015-07-16 16:54:19 -0400307
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400308void tipc_link_set_active(struct tipc_link *l, bool active)
309{
310 l->active = active;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100311}
312
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500313u32 tipc_link_id(struct tipc_link *l)
314{
315 return l->peer_bearer_id << 16 | l->bearer_id;
316}
317
318int tipc_link_window(struct tipc_link *l)
319{
320 return l->window;
321}
322
323int tipc_link_prio(struct tipc_link *l)
324{
325 return l->priority;
326}
327
328unsigned long tipc_link_tolerance(struct tipc_link *l)
329{
330 return l->tolerance;
331}
332
333struct sk_buff_head *tipc_link_inputq(struct tipc_link *l)
334{
335 return l->inputq;
336}
337
338char tipc_link_plane(struct tipc_link *l)
339{
340 return l->net_plane;
341}
342
Jon Paul Maloy52666982015-10-22 08:51:41 -0400343void tipc_link_add_bc_peer(struct tipc_link *snd_l,
344 struct tipc_link *uc_l,
345 struct sk_buff_head *xmitq)
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400346{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400347 struct tipc_link *rcv_l = uc_l->bc_rcvlink;
348
349 snd_l->ackers++;
350 rcv_l->acked = snd_l->snd_nxt - 1;
Jon Paul Maloy9a650832015-11-19 14:12:50 -0500351 snd_l->state = LINK_ESTABLISHED;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400352 tipc_link_build_bc_init_msg(uc_l, xmitq);
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400353}
354
Jon Paul Maloy52666982015-10-22 08:51:41 -0400355void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
356 struct tipc_link *rcv_l,
357 struct sk_buff_head *xmitq)
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400358{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400359 u16 ack = snd_l->snd_nxt - 1;
360
361 snd_l->ackers--;
362 tipc_link_bc_ack_rcv(rcv_l, ack, xmitq);
363 tipc_link_reset(rcv_l);
364 rcv_l->state = LINK_RESET;
365 if (!snd_l->ackers) {
366 tipc_link_reset(snd_l);
Jon Paul Maloy9a650832015-11-19 14:12:50 -0500367 snd_l->state = LINK_RESET;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400368 __skb_queue_purge(xmitq);
369 }
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400370}
371
372int tipc_link_bc_peers(struct tipc_link *l)
373{
374 return l->ackers;
375}
376
Jon Paul Maloy959e1782015-10-22 08:51:43 -0400377void tipc_link_set_mtu(struct tipc_link *l, int mtu)
378{
379 l->mtu = mtu;
380}
381
382int tipc_link_mtu(struct tipc_link *l)
383{
384 return l->mtu;
385}
386
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500387u16 tipc_link_rcv_nxt(struct tipc_link *l)
388{
389 return l->rcv_nxt;
390}
391
392u16 tipc_link_acked(struct tipc_link *l)
393{
394 return l->acked;
395}
396
397char *tipc_link_name(struct tipc_link *l)
398{
399 return l->name;
400}
401
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400402static u32 link_own_addr(struct tipc_link *l)
403{
404 return msg_prevnode(l->pmsg);
405}
406
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500407void tipc_link_reinit(struct tipc_link *l, u32 addr)
408{
409 msg_set_prevnode(l->pmsg, addr);
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;
445 struct tipc_msg *hdr;
Allan Stephens37b9c082011-02-28 11:32:27 -0500446
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400447 l = kzalloc(sizeof(*l), GFP_ATOMIC);
448 if (!l)
449 return false;
450 *link = l;
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400451 l->pmsg = (struct tipc_msg *)&l->proto_msg;
452 hdr = l->pmsg;
453 tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer);
454 msg_set_size(hdr, sizeof(l->proto_msg));
455 msg_set_session(hdr, session);
456 msg_set_bearer_id(hdr, l->bearer_id);
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400457
458 /* Note: peer i/f name is completed by reset/activate message */
459 sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
460 tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode),
461 if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400462 strcpy((char *)msg_data(hdr), if_name);
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400463
464 l->addr = peer;
Jon Paul Maloyfd556f22015-10-22 08:51:40 -0400465 l->peer_caps = peer_caps;
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400466 l->net = net;
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400467 l->peer_session = WILDCARD_SESSION;
468 l->bearer_id = bearer_id;
469 l->tolerance = tolerance;
470 l->net_plane = net_plane;
471 l->advertised_mtu = mtu;
472 l->mtu = mtu;
473 l->priority = priority;
474 tipc_link_set_queue_limits(l, window);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400475 l->ackers = 1;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400476 l->bc_sndlink = bc_sndlink;
477 l->bc_rcvlink = bc_rcvlink;
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400478 l->inputq = inputq;
479 l->namedq = namedq;
480 l->state = LINK_RESETTING;
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400481 __skb_queue_head_init(&l->transmq);
482 __skb_queue_head_init(&l->backlogq);
483 __skb_queue_head_init(&l->deferdq);
484 skb_queue_head_init(&l->wakeupq);
485 skb_queue_head_init(l->inputq);
486 return true;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100487}
488
Jon Paul Maloy32301902015-10-22 08:51:37 -0400489/**
490 * tipc_link_bc_create - create new link to be used for broadcast
491 * @n: pointer to associated node
492 * @mtu: mtu to be used
493 * @window: send window to be used
494 * @inputq: queue to put messages ready for delivery
495 * @namedq: queue to put binding table update messages ready for delivery
496 * @link: return value, pointer to put the created link
497 *
498 * Returns true if link was created, otherwise false
499 */
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400500bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400501 int mtu, int window, u16 peer_caps,
Jon Paul Maloy32301902015-10-22 08:51:37 -0400502 struct sk_buff_head *inputq,
503 struct sk_buff_head *namedq,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400504 struct tipc_link *bc_sndlink,
Jon Paul Maloy32301902015-10-22 08:51:37 -0400505 struct tipc_link **link)
506{
507 struct tipc_link *l;
508
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400509 if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window,
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400510 0, ownnode, peer, peer_caps, bc_sndlink,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400511 NULL, inputq, namedq, link))
Jon Paul Maloy32301902015-10-22 08:51:37 -0400512 return false;
513
514 l = *link;
515 strcpy(l->name, tipc_bclink_name);
516 tipc_link_reset(l);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400517 l->state = LINK_RESET;
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400518 l->ackers = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400519 l->bc_rcvlink = l;
520
521 /* Broadcast send link is always up */
522 if (link_is_bc_sndlink(l))
523 l->state = LINK_ESTABLISHED;
524
Jon Paul Maloy32301902015-10-22 08:51:37 -0400525 return true;
526}
527
Per Lidenb97bf3f2006-01-02 19:04:38 +0100528/**
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400529 * tipc_link_fsm_evt - link finite state machine
530 * @l: pointer to link
531 * @evt: state machine event to be processed
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400532 */
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400533int tipc_link_fsm_evt(struct tipc_link *l, int evt)
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400534{
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400535 int rc = 0;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400536
537 switch (l->state) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400538 case LINK_RESETTING:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400539 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400540 case LINK_PEER_RESET_EVT:
541 l->state = LINK_PEER_RESET;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400542 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400543 case LINK_RESET_EVT:
544 l->state = LINK_RESET;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400545 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400546 case LINK_FAILURE_EVT:
547 case LINK_FAILOVER_BEGIN_EVT:
548 case LINK_ESTABLISH_EVT:
549 case LINK_FAILOVER_END_EVT:
550 case LINK_SYNCH_BEGIN_EVT:
551 case LINK_SYNCH_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400552 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400553 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400554 }
555 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400556 case LINK_RESET:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400557 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400558 case LINK_PEER_RESET_EVT:
559 l->state = LINK_ESTABLISHING;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400560 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400561 case LINK_FAILOVER_BEGIN_EVT:
562 l->state = LINK_FAILINGOVER;
563 case LINK_FAILURE_EVT:
564 case LINK_RESET_EVT:
565 case LINK_ESTABLISH_EVT:
566 case LINK_FAILOVER_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400567 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400568 case LINK_SYNCH_BEGIN_EVT:
569 case LINK_SYNCH_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400570 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400571 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400572 }
573 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400574 case LINK_PEER_RESET:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400575 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400576 case LINK_RESET_EVT:
577 l->state = LINK_ESTABLISHING;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400578 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400579 case LINK_PEER_RESET_EVT:
580 case LINK_ESTABLISH_EVT:
581 case LINK_FAILURE_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400582 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400583 case LINK_SYNCH_BEGIN_EVT:
584 case LINK_SYNCH_END_EVT:
585 case LINK_FAILOVER_BEGIN_EVT:
586 case LINK_FAILOVER_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400587 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400588 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400589 }
590 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400591 case LINK_FAILINGOVER:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400592 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400593 case LINK_FAILOVER_END_EVT:
594 l->state = LINK_RESET;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400595 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400596 case LINK_PEER_RESET_EVT:
597 case LINK_RESET_EVT:
598 case LINK_ESTABLISH_EVT:
599 case LINK_FAILURE_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400600 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400601 case LINK_FAILOVER_BEGIN_EVT:
602 case LINK_SYNCH_BEGIN_EVT:
603 case LINK_SYNCH_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400604 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400605 goto illegal_evt;
606 }
607 break;
608 case LINK_ESTABLISHING:
609 switch (evt) {
610 case LINK_ESTABLISH_EVT:
611 l->state = LINK_ESTABLISHED;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400612 break;
613 case LINK_FAILOVER_BEGIN_EVT:
614 l->state = LINK_FAILINGOVER;
615 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400616 case LINK_RESET_EVT:
Jon Paul Maloy73f646c2015-10-15 14:52:44 -0400617 l->state = LINK_RESET;
618 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400619 case LINK_FAILURE_EVT:
Jon Paul Maloy73f646c2015-10-15 14:52:44 -0400620 case LINK_PEER_RESET_EVT:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400621 case LINK_SYNCH_BEGIN_EVT:
622 case LINK_FAILOVER_END_EVT:
623 break;
624 case LINK_SYNCH_END_EVT:
625 default:
626 goto illegal_evt;
627 }
628 break;
629 case LINK_ESTABLISHED:
630 switch (evt) {
631 case LINK_PEER_RESET_EVT:
632 l->state = LINK_PEER_RESET;
633 rc |= TIPC_LINK_DOWN_EVT;
634 break;
635 case LINK_FAILURE_EVT:
636 l->state = LINK_RESETTING;
637 rc |= TIPC_LINK_DOWN_EVT;
638 break;
639 case LINK_RESET_EVT:
640 l->state = LINK_RESET;
641 break;
642 case LINK_ESTABLISH_EVT:
Jon Paul Maloy5ae2f8e2015-08-20 02:12:55 -0400643 case LINK_SYNCH_END_EVT:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400644 break;
645 case LINK_SYNCH_BEGIN_EVT:
646 l->state = LINK_SYNCHING;
647 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400648 case LINK_FAILOVER_BEGIN_EVT:
649 case LINK_FAILOVER_END_EVT:
650 default:
651 goto illegal_evt;
652 }
653 break;
654 case LINK_SYNCHING:
655 switch (evt) {
656 case LINK_PEER_RESET_EVT:
657 l->state = LINK_PEER_RESET;
658 rc |= TIPC_LINK_DOWN_EVT;
659 break;
660 case LINK_FAILURE_EVT:
661 l->state = LINK_RESETTING;
662 rc |= TIPC_LINK_DOWN_EVT;
663 break;
664 case LINK_RESET_EVT:
665 l->state = LINK_RESET;
666 break;
667 case LINK_ESTABLISH_EVT:
668 case LINK_SYNCH_BEGIN_EVT:
669 break;
670 case LINK_SYNCH_END_EVT:
671 l->state = LINK_ESTABLISHED;
672 break;
673 case LINK_FAILOVER_BEGIN_EVT:
674 case LINK_FAILOVER_END_EVT:
675 default:
676 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400677 }
678 break;
679 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400680 pr_err("Unknown FSM state %x in %s\n", l->state, l->name);
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400681 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400682 return rc;
683illegal_evt:
684 pr_err("Illegal FSM event %x in state %x on link %s\n",
685 evt, l->state, l->name);
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400686 return rc;
687}
688
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400689/* link_profile_stats - update statistical profiling of traffic
690 */
691static void link_profile_stats(struct tipc_link *l)
692{
693 struct sk_buff *skb;
694 struct tipc_msg *msg;
695 int length;
696
697 /* Update counters used in statistical profiling of send traffic */
698 l->stats.accu_queue_sz += skb_queue_len(&l->transmq);
699 l->stats.queue_sz_counts++;
700
701 skb = skb_peek(&l->transmq);
702 if (!skb)
703 return;
704 msg = buf_msg(skb);
705 length = msg_size(msg);
706
707 if (msg_user(msg) == MSG_FRAGMENTER) {
708 if (msg_type(msg) != FIRST_FRAGMENT)
709 return;
710 length = msg_size(msg_get_wrapped(msg));
711 }
712 l->stats.msg_lengths_total += length;
713 l->stats.msg_length_counts++;
714 if (length <= 64)
715 l->stats.msg_length_profile[0]++;
716 else if (length <= 256)
717 l->stats.msg_length_profile[1]++;
718 else if (length <= 1024)
719 l->stats.msg_length_profile[2]++;
720 else if (length <= 4096)
721 l->stats.msg_length_profile[3]++;
722 else if (length <= 16384)
723 l->stats.msg_length_profile[4]++;
724 else if (length <= 32768)
725 l->stats.msg_length_profile[5]++;
726 else
727 l->stats.msg_length_profile[6]++;
728}
729
730/* tipc_link_timeout - perform periodic task as instructed from node timeout
731 */
Jon Paul Maloy52666982015-10-22 08:51:41 -0400732/* tipc_link_timeout - perform periodic task as instructed from node timeout
733 */
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400734int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
735{
736 int rc = 0;
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400737 int mtyp = STATE_MSG;
738 bool xmit = false;
739 bool prb = false;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400740 u16 bc_snt = l->bc_sndlink->snd_nxt - 1;
741 u16 bc_acked = l->bc_rcvlink->acked;
742 bool bc_up = link_is_up(l->bc_rcvlink);
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400743
744 link_profile_stats(l);
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400745
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400746 switch (l->state) {
747 case LINK_ESTABLISHED:
748 case LINK_SYNCHING:
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400749 if (!l->silent_intv_cnt) {
Jon Paul Maloy52666982015-10-22 08:51:41 -0400750 if (bc_up && (bc_acked != bc_snt))
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400751 xmit = true;
752 } else if (l->silent_intv_cnt <= l->abort_limit) {
753 xmit = true;
754 prb = true;
755 } else {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400756 rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400757 }
758 l->silent_intv_cnt++;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400759 break;
760 case LINK_RESET:
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400761 xmit = true;
762 mtyp = RESET_MSG;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400763 break;
764 case LINK_ESTABLISHING:
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400765 xmit = true;
766 mtyp = ACTIVATE_MSG;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400767 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400768 case LINK_PEER_RESET:
Jon Paul Maloy598411d2015-07-30 18:24:23 -0400769 case LINK_RESETTING:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400770 case LINK_FAILINGOVER:
771 break;
772 default:
773 break;
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400774 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400775
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400776 if (xmit)
777 tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq);
778
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400779 return rc;
780}
781
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400782/**
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400783 * link_schedule_user - schedule a message sender for wakeup after congestion
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400784 * @link: congested link
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400785 * @list: message that was attempted sent
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400786 * Create pseudo msg to send back to user when congestion abates
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400787 * Does not consume buffer list
Per Lidenb97bf3f2006-01-02 19:04:38 +0100788 */
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400789static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100790{
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400791 struct tipc_msg *msg = buf_msg(skb_peek(list));
792 int imp = msg_importance(msg);
793 u32 oport = msg_origport(msg);
794 u32 addr = link_own_addr(link);
795 struct sk_buff *skb;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100796
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400797 /* This really cannot happen... */
798 if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) {
799 pr_warn("%s<%s>, send queue full", link_rst_msg, link->name);
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400800 return -ENOBUFS;
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400801 }
802 /* Non-blocking sender: */
803 if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending)
804 return -ELINKCONG;
805
806 /* Create and schedule wakeup pseudo message */
807 skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0,
808 addr, addr, oport, 0, 0);
809 if (!skb)
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400810 return -ENOBUFS;
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400811 TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list);
812 TIPC_SKB_CB(skb)->chain_imp = imp;
813 skb_queue_tail(&link->wakeupq, skb);
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400814 link->stats.link_congs++;
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400815 return -ELINKCONG;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100816}
817
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400818/**
819 * link_prepare_wakeup - prepare users for wakeup after congestion
820 * @link: congested link
821 * Move a number of waiting users, as permitted by available space in
822 * the send queue, from link wait queue to node wait queue for wakeup
823 */
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400824void link_prepare_wakeup(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100825{
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400826 int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,};
827 int imp, lim;
Ying Xue58d78b32014-11-26 11:41:51 +0800828 struct sk_buff *skb, *tmp;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100829
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400830 skb_queue_walk_safe(&l->wakeupq, skb, tmp) {
831 imp = TIPC_SKB_CB(skb)->chain_imp;
832 lim = l->window + l->backlog[imp].limit;
833 pnd[imp] += TIPC_SKB_CB(skb)->chain_sz;
834 if ((pnd[imp] + l->backlog[imp].len) >= lim)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100835 break;
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400836 skb_unlink(skb, &l->wakeupq);
Jon Paul Maloyd39bbd42015-07-16 16:54:21 -0400837 skb_queue_tail(l->inputq, skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100838 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100839}
840
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400841void tipc_link_reset(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100842{
Allan Stephensa686e682008-06-04 17:29:39 -0700843 /* Link is down, accept any session */
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400844 l->peer_session = WILDCARD_SESSION;
845
846 /* If peer is up, it only accepts an incremented session number */
847 msg_set_session(l->pmsg, msg_session(l->pmsg) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100848
Jon Paul Maloyed193ec2015-04-02 09:33:02 -0400849 /* Prepare for renewed mtu size negotiation */
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400850 l->mtu = l->advertised_mtu;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900851
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400852 /* Clean up all queues and counters: */
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400853 __skb_queue_purge(&l->transmq);
854 __skb_queue_purge(&l->deferdq);
Jon Paul Maloy23d83352015-07-30 18:24:24 -0400855 skb_queue_splice_init(&l->wakeupq, l->inputq);
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400856 __skb_queue_purge(&l->backlogq);
857 l->backlog[TIPC_LOW_IMPORTANCE].len = 0;
858 l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0;
859 l->backlog[TIPC_HIGH_IMPORTANCE].len = 0;
860 l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0;
861 l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400862 kfree_skb(l->reasm_buf);
863 kfree_skb(l->failover_reasm_skb);
864 l->reasm_buf = NULL;
865 l->failover_reasm_skb = NULL;
866 l->rcv_unacked = 0;
867 l->snd_nxt = 1;
868 l->rcv_nxt = 1;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400869 l->acked = 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400870 l->silent_intv_cnt = 0;
871 l->stats.recv_info = 0;
872 l->stale_count = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400873 l->bc_peer_is_up = false;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500874 tipc_link_reset_stats(l);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100875}
876
Per Lidenb97bf3f2006-01-02 19:04:38 +0100877/**
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400878 * tipc_link_xmit(): enqueue buffer list according to queue situation
879 * @link: link to use
880 * @list: chain of buffers containing message
881 * @xmitq: returned list of packets to be sent by caller
882 *
883 * Consumes the buffer chain, except when returning -ELINKCONG,
884 * since the caller then may want to make more send attempts.
885 * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
886 * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
887 */
888int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
889 struct sk_buff_head *xmitq)
890{
891 struct tipc_msg *hdr = buf_msg(skb_peek(list));
892 unsigned int maxwin = l->window;
893 unsigned int i, imp = msg_importance(hdr);
894 unsigned int mtu = l->mtu;
895 u16 ack = l->rcv_nxt - 1;
896 u16 seqno = l->snd_nxt;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400897 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400898 struct sk_buff_head *transmq = &l->transmq;
899 struct sk_buff_head *backlogq = &l->backlogq;
900 struct sk_buff *skb, *_skb, *bskb;
901
902 /* Match msg importance against this and all higher backlog limits: */
903 for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) {
904 if (unlikely(l->backlog[i].len >= l->backlog[i].limit))
905 return link_schedule_user(l, list);
906 }
907 if (unlikely(msg_size(hdr) > mtu))
908 return -EMSGSIZE;
909
910 /* Prepare each packet for sending, and add to relevant queue: */
911 while (skb_queue_len(list)) {
912 skb = skb_peek(list);
913 hdr = buf_msg(skb);
914 msg_set_seqno(hdr, seqno);
915 msg_set_ack(hdr, ack);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400916 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400917
918 if (likely(skb_queue_len(transmq) < maxwin)) {
919 _skb = skb_clone(skb, GFP_ATOMIC);
920 if (!_skb)
921 return -ENOBUFS;
922 __skb_dequeue(list);
923 __skb_queue_tail(transmq, skb);
924 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400925 TIPC_SKB_CB(skb)->ackers = l->ackers;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400926 l->rcv_unacked = 0;
927 seqno++;
928 continue;
929 }
930 if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) {
931 kfree_skb(__skb_dequeue(list));
932 l->stats.sent_bundled++;
933 continue;
934 }
935 if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) {
936 kfree_skb(__skb_dequeue(list));
937 __skb_queue_tail(backlogq, bskb);
938 l->backlog[msg_importance(buf_msg(bskb))].len++;
939 l->stats.sent_bundled++;
940 l->stats.sent_bundles++;
941 continue;
942 }
943 l->backlog[imp].len += skb_queue_len(list);
944 skb_queue_splice_tail_init(list, backlogq);
945 }
946 l->snd_nxt = seqno;
947 return 0;
948}
949
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400950void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq)
951{
952 struct sk_buff *skb, *_skb;
953 struct tipc_msg *hdr;
954 u16 seqno = l->snd_nxt;
955 u16 ack = l->rcv_nxt - 1;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400956 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400957
958 while (skb_queue_len(&l->transmq) < l->window) {
959 skb = skb_peek(&l->backlogq);
960 if (!skb)
961 break;
962 _skb = skb_clone(skb, GFP_ATOMIC);
963 if (!_skb)
964 break;
965 __skb_dequeue(&l->backlogq);
966 hdr = buf_msg(skb);
967 l->backlog[msg_importance(hdr)].len--;
968 __skb_queue_tail(&l->transmq, skb);
969 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400970 TIPC_SKB_CB(skb)->ackers = l->ackers;
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400971 msg_set_seqno(hdr, seqno);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400972 msg_set_ack(hdr, ack);
973 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400974 l->rcv_unacked = 0;
975 seqno++;
976 }
977 l->snd_nxt = seqno;
978}
979
Jon Paul Maloy52666982015-10-22 08:51:41 -0400980static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb)
Allan Stephensd356eeb2006-06-25 23:40:01 -0700981{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400982 struct tipc_msg *hdr = buf_msg(skb);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700983
Jon Paul Maloy52666982015-10-22 08:51:41 -0400984 pr_warn("Retransmission failure on link <%s>\n", l->name);
985 link_print(l, "Resetting link ");
986 pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
987 msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr));
988 pr_info("sqno %u, prev: %x, src: %x\n",
989 msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr));
Allan Stephensd356eeb2006-06-25 23:40:01 -0700990}
991
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400992int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to,
993 struct sk_buff_head *xmitq)
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400994{
995 struct sk_buff *_skb, *skb = skb_peek(&l->transmq);
996 struct tipc_msg *hdr;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400997 u16 ack = l->rcv_nxt - 1;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400998 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400999
1000 if (!skb)
1001 return 0;
1002
1003 /* Detect repeated retransmit failures on same packet */
1004 if (likely(l->last_retransm != buf_seqno(skb))) {
1005 l->last_retransm = buf_seqno(skb);
1006 l->stale_count = 1;
1007 } else if (++l->stale_count > 100) {
1008 link_retransmit_failure(l, skb);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001009 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001010 }
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001011
1012 /* Move forward to where retransmission should start */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001013 skb_queue_walk(&l->transmq, skb) {
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001014 if (!less(buf_seqno(skb), from))
1015 break;
1016 }
1017
1018 skb_queue_walk_from(&l->transmq, skb) {
1019 if (more(buf_seqno(skb), to))
1020 break;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001021 hdr = buf_msg(skb);
1022 _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC);
1023 if (!_skb)
1024 return 0;
1025 hdr = buf_msg(_skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001026 msg_set_ack(hdr, ack);
1027 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001028 _skb->priority = TC_PRIO_CONTROL;
1029 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001030 l->stats.retransmitted++;
1031 }
1032 return 0;
1033}
1034
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001035/* tipc_data_input - deliver data and name distr msgs to upper layer
Erik Hugne7ae934b2014-07-01 10:22:40 +02001036 *
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001037 * Consumes buffer if message is of right type
Erik Hugne7ae934b2014-07-01 10:22:40 +02001038 * Node lock must be held
1039 */
Jon Paul Maloy52666982015-10-22 08:51:41 -04001040static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb,
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001041 struct sk_buff_head *inputq)
Erik Hugne7ae934b2014-07-01 10:22:40 +02001042{
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001043 switch (msg_user(buf_msg(skb))) {
Erik Hugne7ae934b2014-07-01 10:22:40 +02001044 case TIPC_LOW_IMPORTANCE:
1045 case TIPC_MEDIUM_IMPORTANCE:
1046 case TIPC_HIGH_IMPORTANCE:
1047 case TIPC_CRITICAL_IMPORTANCE:
1048 case CONN_MANAGER:
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001049 skb_queue_tail(inputq, skb);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001050 return true;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001051 case NAME_DISTRIBUTOR:
Jon Paul Maloy52666982015-10-22 08:51:41 -04001052 l->bc_rcvlink->state = LINK_ESTABLISHED;
1053 skb_queue_tail(l->namedq, skb);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001054 return true;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001055 case MSG_BUNDLER:
Jon Paul Maloydff29b12015-04-02 09:33:01 -04001056 case TUNNEL_PROTOCOL:
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001057 case MSG_FRAGMENTER:
1058 case BCAST_PROTOCOL:
1059 return false;
1060 default:
1061 pr_warn("Dropping received illegal msg type\n");
1062 kfree_skb(skb);
1063 return false;
1064 };
1065}
1066
1067/* tipc_link_input - process packet that has passed link protocol check
1068 *
1069 * Consumes buffer
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001070 */
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001071static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,
1072 struct sk_buff_head *inputq)
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001073{
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001074 struct tipc_msg *hdr = buf_msg(skb);
1075 struct sk_buff **reasm_skb = &l->reasm_buf;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001076 struct sk_buff *iskb;
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001077 struct sk_buff_head tmpq;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001078 int usr = msg_user(hdr);
Jon Paul Maloy6144a992015-07-30 18:24:16 -04001079 int rc = 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001080 int pos = 0;
1081 int ipos = 0;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001082
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001083 if (unlikely(usr == TUNNEL_PROTOCOL)) {
1084 if (msg_type(hdr) == SYNCH_MSG) {
1085 __skb_queue_purge(&l->deferdq);
1086 goto drop;
Jon Paul Maloy8b4ed862015-03-25 12:07:26 -04001087 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001088 if (!tipc_msg_extract(skb, &iskb, &ipos))
1089 return rc;
1090 kfree_skb(skb);
1091 skb = iskb;
1092 hdr = buf_msg(skb);
1093 if (less(msg_seqno(hdr), l->drop_point))
1094 goto drop;
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001095 if (tipc_data_input(l, skb, inputq))
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001096 return rc;
1097 usr = msg_user(hdr);
1098 reasm_skb = &l->failover_reasm_skb;
1099 }
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001100
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001101 if (usr == MSG_BUNDLER) {
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001102 skb_queue_head_init(&tmpq);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001103 l->stats.recv_bundles++;
1104 l->stats.recv_bundled += msg_msgcnt(hdr);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001105 while (tipc_msg_extract(skb, &iskb, &pos))
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001106 tipc_data_input(l, iskb, &tmpq);
1107 tipc_skb_queue_splice_tail(&tmpq, inputq);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001108 return 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001109 } else if (usr == MSG_FRAGMENTER) {
1110 l->stats.recv_fragments++;
1111 if (tipc_buf_append(reasm_skb, &skb)) {
1112 l->stats.recv_fragmented++;
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001113 tipc_data_input(l, skb, inputq);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001114 } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) {
1115 pr_warn_ratelimited("Unable to build fragment list\n");
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001116 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001117 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001118 return 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001119 } else if (usr == BCAST_PROTOCOL) {
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001120 tipc_bcast_lock(l->net);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001121 tipc_link_bc_init_rcv(l->bc_rcvlink, hdr);
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001122 tipc_bcast_unlock(l->net);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001123 }
1124drop:
1125 kfree_skb(skb);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001126 return 0;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001127}
1128
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001129static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
1130{
1131 bool released = false;
1132 struct sk_buff *skb, *tmp;
1133
1134 skb_queue_walk_safe(&l->transmq, skb, tmp) {
1135 if (more(buf_seqno(skb), acked))
1136 break;
1137 __skb_unlink(skb, &l->transmq);
1138 kfree_skb(skb);
1139 released = true;
1140 }
1141 return released;
1142}
1143
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001144/* tipc_link_build_ack_msg: prepare link acknowledge message for transmission
Jon Paul Maloy52666982015-10-22 08:51:41 -04001145 *
1146 * Note that sending of broadcast ack is coordinated among nodes, to reduce
1147 * risk of ack storms towards the sender
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001148 */
Jon Paul Maloy52666982015-10-22 08:51:41 -04001149int tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001150{
Jon Paul Maloy52666982015-10-22 08:51:41 -04001151 if (!l)
1152 return 0;
1153
1154 /* Broadcast ACK must be sent via a unicast link => defer to caller */
1155 if (link_is_bc_rcvlink(l)) {
1156 if (((l->rcv_nxt ^ link_own_addr(l)) & 0xf) != 0xf)
1157 return 0;
1158 l->rcv_unacked = 0;
1159 return TIPC_LINK_SND_BC_ACK;
1160 }
1161
1162 /* Unicast ACK */
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001163 l->rcv_unacked = 0;
1164 l->stats.sent_acks++;
1165 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001166 return 0;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001167}
1168
Jon Paul Maloy282b3a02015-10-15 14:52:45 -04001169/* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message
1170 */
1171void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
1172{
1173 int mtyp = RESET_MSG;
1174
1175 if (l->state == LINK_ESTABLISHING)
1176 mtyp = ACTIVATE_MSG;
1177
1178 tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq);
1179}
1180
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001181/* tipc_link_build_nack_msg: prepare link nack message for transmission
1182 */
1183static void tipc_link_build_nack_msg(struct tipc_link *l,
1184 struct sk_buff_head *xmitq)
1185{
1186 u32 def_cnt = ++l->stats.deferred_recv;
1187
Jon Paul Maloy52666982015-10-22 08:51:41 -04001188 if (link_is_bc_rcvlink(l))
1189 return;
1190
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001191 if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV))
1192 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
1193}
1194
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001195/* tipc_link_rcv - process TIPC packets/messages arriving from off-node
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001196 * @l: the link that should handle the message
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001197 * @skb: TIPC packet
1198 * @xmitq: queue to place packets to be sent after this call
1199 */
1200int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
1201 struct sk_buff_head *xmitq)
1202{
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001203 struct sk_buff_head *defq = &l->deferdq;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001204 struct tipc_msg *hdr;
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001205 u16 seqno, rcv_nxt, win_lim;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001206 int rc = 0;
1207
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001208 do {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001209 hdr = buf_msg(skb);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001210 seqno = msg_seqno(hdr);
1211 rcv_nxt = l->rcv_nxt;
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001212 win_lim = rcv_nxt + TIPC_MAX_LINK_WIN;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001213
1214 /* Verify and update link state */
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001215 if (unlikely(msg_user(hdr) == LINK_PROTOCOL))
1216 return tipc_link_proto_rcv(l, skb, xmitq);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001217
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001218 if (unlikely(!link_is_up(l))) {
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001219 if (l->state == LINK_ESTABLISHING)
1220 rc = TIPC_LINK_UP_EVT;
1221 goto drop;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001222 }
1223
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001224 /* Don't send probe at next timeout expiration */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001225 l->silent_intv_cnt = 0;
1226
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001227 /* Drop if outside receive window */
1228 if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) {
1229 l->stats.duplicates++;
1230 goto drop;
1231 }
1232
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001233 /* Forward queues and wake up waiting users */
1234 if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) {
1235 tipc_link_advance_backlog(l, xmitq);
1236 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1237 link_prepare_wakeup(l);
1238 }
1239
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001240 /* Defer delivery if sequence gap */
1241 if (unlikely(seqno != rcv_nxt)) {
Jon Paul Maloy8306f992015-10-15 14:52:43 -04001242 __tipc_skb_queue_sorted(defq, seqno, skb);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001243 tipc_link_build_nack_msg(l, xmitq);
1244 break;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001245 }
1246
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001247 /* Deliver packet */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001248 l->rcv_nxt++;
1249 l->stats.recv_info++;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001250 if (!tipc_data_input(l, skb, l->inputq))
Jon Paul Maloy52666982015-10-22 08:51:41 -04001251 rc |= tipc_link_input(l, skb, l->inputq);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001252 if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN))
Jon Paul Maloy52666982015-10-22 08:51:41 -04001253 rc |= tipc_link_build_ack_msg(l, xmitq);
1254 if (unlikely(rc & ~TIPC_LINK_SND_BC_ACK))
1255 break;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001256 } while ((skb = __skb_dequeue(defq)));
1257
1258 return rc;
1259drop:
1260 kfree_skb(skb);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001261 return rc;
1262}
1263
Allan Stephens8809b252011-10-25 10:44:35 -04001264/*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001265 * Send protocol message to the other endpoint.
1266 */
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001267static void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ,
1268 int probe_msg, u32 gap, u32 tolerance,
1269 u32 priority)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001270{
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001271 struct sk_buff *skb = NULL;
1272 struct sk_buff_head xmitq;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001273
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001274 __skb_queue_head_init(&xmitq);
1275 tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap,
1276 tolerance, priority, &xmitq);
1277 skb = __skb_dequeue(&xmitq);
1278 if (!skb)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001279 return;
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001280 tipc_bearer_xmit_skb(l->net, l->bearer_id, skb, l->media_addr);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001281 l->rcv_unacked = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001282}
1283
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001284static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
1285 u16 rcvgap, int tolerance, int priority,
1286 struct sk_buff_head *xmitq)
1287{
1288 struct sk_buff *skb = NULL;
1289 struct tipc_msg *hdr = l->pmsg;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001290 bool node_up = link_is_up(l->bc_rcvlink);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001291
1292 /* Don't send protocol message during reset or link failover */
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001293 if (tipc_link_is_blocked(l))
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001294 return;
1295
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001296 msg_set_type(hdr, mtyp);
1297 msg_set_net_plane(hdr, l->net_plane);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001298 msg_set_next_sent(hdr, l->snd_nxt);
1299 msg_set_ack(hdr, l->rcv_nxt - 1);
1300 msg_set_bcast_ack(hdr, l->bc_rcvlink->rcv_nxt - 1);
1301 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001302 msg_set_link_tolerance(hdr, tolerance);
1303 msg_set_linkprio(hdr, priority);
1304 msg_set_redundant_link(hdr, node_up);
1305 msg_set_seq_gap(hdr, 0);
1306
1307 /* Compatibility: created msg must not be in sequence with pkt flow */
Jon Paul Maloy52666982015-10-22 08:51:41 -04001308 msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001309
1310 if (mtyp == STATE_MSG) {
1311 if (!tipc_link_is_up(l))
1312 return;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001313
1314 /* Override rcvgap if there are packets in deferred queue */
1315 if (!skb_queue_empty(&l->deferdq))
Jon Paul Maloy52666982015-10-22 08:51:41 -04001316 rcvgap = buf_seqno(skb_peek(&l->deferdq)) - l->rcv_nxt;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001317 if (rcvgap) {
1318 msg_set_seq_gap(hdr, rcvgap);
1319 l->stats.sent_nacks++;
1320 }
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001321 msg_set_probe(hdr, probe);
1322 if (probe)
1323 l->stats.sent_probes++;
1324 l->stats.sent_states++;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001325 l->rcv_unacked = 0;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001326 } else {
1327 /* RESET_MSG or ACTIVATE_MSG */
1328 msg_set_max_pkt(hdr, l->advertised_mtu);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001329 msg_set_ack(hdr, l->rcv_nxt - 1);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001330 msg_set_next_sent(hdr, 1);
1331 }
1332 skb = tipc_buf_acquire(msg_size(hdr));
1333 if (!skb)
1334 return;
1335 skb_copy_to_linear_data(skb, hdr, msg_size(hdr));
1336 skb->priority = TC_PRIO_CONTROL;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001337 __skb_queue_tail(xmitq, skb);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001338}
Per Lidenb97bf3f2006-01-02 19:04:38 +01001339
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001340/* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001341 * with contents of the link's transmit and backlog queues.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001342 */
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001343void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
1344 int mtyp, struct sk_buff_head *xmitq)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001345{
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001346 struct sk_buff *skb, *tnlskb;
1347 struct tipc_msg *hdr, tnlhdr;
1348 struct sk_buff_head *queue = &l->transmq;
1349 struct sk_buff_head tmpxq, tnlq;
1350 u16 pktlen, pktcnt, seqno = l->snd_nxt;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001351
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001352 if (!tnl)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001353 return;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001354
1355 skb_queue_head_init(&tnlq);
1356 skb_queue_head_init(&tmpxq);
1357
1358 /* At least one packet required for safe algorithm => add dummy */
1359 skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
1360 BASIC_H_SIZE, 0, l->addr, link_own_addr(l),
1361 0, 0, TIPC_ERR_NO_PORT);
Ying Xuea6ca1092014-11-26 11:41:55 +08001362 if (!skb) {
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001363 pr_warn("%sunable to create tunnel packet\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001364 return;
Allan Stephens5392d642006-06-25 23:52:50 -07001365 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001366 skb_queue_tail(&tnlq, skb);
1367 tipc_link_xmit(l, &tnlq, &tmpxq);
1368 __skb_queue_purge(&tmpxq);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001369
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001370 /* Initialize reusable tunnel packet header */
1371 tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL,
1372 mtyp, INT_H_SIZE, l->addr);
1373 pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq);
1374 msg_set_msgcnt(&tnlhdr, pktcnt);
1375 msg_set_bearer_id(&tnlhdr, l->peer_bearer_id);
1376tnl:
1377 /* Wrap each packet into a tunnel packet */
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -04001378 skb_queue_walk(queue, skb) {
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001379 hdr = buf_msg(skb);
1380 if (queue == &l->backlogq)
1381 msg_set_seqno(hdr, seqno++);
1382 pktlen = msg_size(hdr);
1383 msg_set_size(&tnlhdr, pktlen + INT_H_SIZE);
1384 tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE);
1385 if (!tnlskb) {
1386 pr_warn("%sunable to send packet\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001387 return;
1388 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001389 skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE);
1390 skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen);
1391 __skb_queue_tail(&tnlq, tnlskb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001392 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001393 if (queue != &l->backlogq) {
1394 queue = &l->backlogq;
1395 goto tnl;
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -04001396 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001397
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001398 tipc_link_xmit(tnl, &tnlq, xmitq);
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001399
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001400 if (mtyp == FAILOVER_MSG) {
1401 tnl->drop_point = l->rcv_nxt;
1402 tnl->failover_reasm_skb = l->reasm_buf;
1403 l->reasm_buf = NULL;
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001404 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001405}
1406
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001407/* tipc_link_proto_rcv(): receive link level protocol message :
1408 * Note that network plane id propagates through the network, and may
1409 * change at any time. The node with lowest numerical id determines
1410 * network plane
1411 */
1412static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
1413 struct sk_buff_head *xmitq)
1414{
1415 struct tipc_msg *hdr = buf_msg(skb);
1416 u16 rcvgap = 0;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001417 u16 ack = msg_ack(hdr);
1418 u16 gap = msg_seq_gap(hdr);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001419 u16 peers_snd_nxt = msg_next_sent(hdr);
1420 u16 peers_tol = msg_link_tolerance(hdr);
1421 u16 peers_prio = msg_linkprio(hdr);
Jon Paul Maloy2be80c22015-08-20 02:12:56 -04001422 u16 rcv_nxt = l->rcv_nxt;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001423 int mtyp = msg_type(hdr);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001424 char *if_name;
1425 int rc = 0;
1426
Jon Paul Maloy52666982015-10-22 08:51:41 -04001427 if (tipc_link_is_blocked(l) || !xmitq)
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001428 goto exit;
1429
1430 if (link_own_addr(l) > msg_prevnode(hdr))
1431 l->net_plane = msg_net_plane(hdr);
1432
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001433 switch (mtyp) {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001434 case RESET_MSG:
1435
1436 /* Ignore duplicate RESET with old session number */
1437 if ((less_eq(msg_session(hdr), l->peer_session)) &&
1438 (l->peer_session != WILDCARD_SESSION))
1439 break;
1440 /* fall thru' */
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001441
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001442 case ACTIVATE_MSG:
Jon Paul Maloyc7cad0d2015-11-19 14:30:40 -05001443 skb_linearize(skb);
1444 hdr = buf_msg(skb);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001445
1446 /* Complete own link name with peer's interface name */
1447 if_name = strrchr(l->name, ':') + 1;
1448 if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME)
1449 break;
1450 if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
1451 break;
1452 strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME);
1453
1454 /* Update own tolerance if peer indicates a non-zero value */
1455 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
1456 l->tolerance = peers_tol;
1457
1458 /* Update own priority if peer's priority is higher */
1459 if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
1460 l->priority = peers_prio;
1461
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001462 /* ACTIVATE_MSG serves as PEER_RESET if link is already down */
1463 if ((mtyp == RESET_MSG) || !link_is_up(l))
1464 rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
1465
1466 /* ACTIVATE_MSG takes up link if it was already locally reset */
1467 if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING))
1468 rc = TIPC_LINK_UP_EVT;
1469
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001470 l->peer_session = msg_session(hdr);
1471 l->peer_bearer_id = msg_bearer_id(hdr);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001472 if (l->mtu > msg_max_pkt(hdr))
1473 l->mtu = msg_max_pkt(hdr);
1474 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001475
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001476 case STATE_MSG:
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001477
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001478 /* Update own tolerance if peer indicates a non-zero value */
1479 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
1480 l->tolerance = peers_tol;
1481
1482 l->silent_intv_cnt = 0;
1483 l->stats.recv_states++;
1484 if (msg_probe(hdr))
1485 l->stats.recv_probes++;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001486
1487 if (!link_is_up(l)) {
1488 if (l->state == LINK_ESTABLISHING)
1489 rc = TIPC_LINK_UP_EVT;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001490 break;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001491 }
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001492
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001493 /* Send NACK if peer has sent pkts we haven't received yet */
Jon Paul Maloy2be80c22015-08-20 02:12:56 -04001494 if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l))
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001495 rcvgap = peers_snd_nxt - l->rcv_nxt;
1496 if (rcvgap || (msg_probe(hdr)))
1497 tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap,
Jon Paul Maloy16040892015-07-21 06:42:28 -04001498 0, 0, xmitq);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001499 tipc_link_release_pkts(l, ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001500
1501 /* If NACK, retransmit will now start at right position */
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001502 if (gap) {
1503 rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001504 l->stats.recv_nacks++;
1505 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001506
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001507 tipc_link_advance_backlog(l, xmitq);
1508 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1509 link_prepare_wakeup(l);
1510 }
1511exit:
1512 kfree_skb(skb);
1513 return rc;
1514}
1515
Jon Paul Maloy52666982015-10-22 08:51:41 -04001516/* tipc_link_build_bc_proto_msg() - create broadcast protocol message
1517 */
1518static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast,
1519 u16 peers_snd_nxt,
1520 struct sk_buff_head *xmitq)
1521{
1522 struct sk_buff *skb;
1523 struct tipc_msg *hdr;
1524 struct sk_buff *dfrd_skb = skb_peek(&l->deferdq);
1525 u16 ack = l->rcv_nxt - 1;
1526 u16 gap_to = peers_snd_nxt - 1;
1527
1528 skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
1529 0, l->addr, link_own_addr(l), 0, 0, 0);
1530 if (!skb)
1531 return false;
1532 hdr = buf_msg(skb);
1533 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
1534 msg_set_bcast_ack(hdr, ack);
1535 msg_set_bcgap_after(hdr, ack);
1536 if (dfrd_skb)
1537 gap_to = buf_seqno(dfrd_skb) - 1;
1538 msg_set_bcgap_to(hdr, gap_to);
1539 msg_set_non_seq(hdr, bcast);
1540 __skb_queue_tail(xmitq, skb);
1541 return true;
1542}
1543
1544/* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints.
1545 *
1546 * Give a newly added peer node the sequence number where it should
1547 * start receiving and acking broadcast packets.
1548 */
Wu Fengguang742e0382015-10-24 22:56:01 +08001549static void tipc_link_build_bc_init_msg(struct tipc_link *l,
1550 struct sk_buff_head *xmitq)
Jon Paul Maloy52666982015-10-22 08:51:41 -04001551{
1552 struct sk_buff_head list;
1553
1554 __skb_queue_head_init(&list);
1555 if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list))
1556 return;
1557 tipc_link_xmit(l, &list, xmitq);
1558}
1559
1560/* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer
1561 */
1562void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr)
1563{
1564 int mtyp = msg_type(hdr);
1565 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
1566
1567 if (link_is_up(l))
1568 return;
1569
1570 if (msg_user(hdr) == BCAST_PROTOCOL) {
1571 l->rcv_nxt = peers_snd_nxt;
1572 l->state = LINK_ESTABLISHED;
1573 return;
1574 }
1575
1576 if (l->peer_caps & TIPC_BCAST_SYNCH)
1577 return;
1578
1579 if (msg_peer_node_is_up(hdr))
1580 return;
1581
1582 /* Compatibility: accept older, less safe initial synch data */
1583 if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG))
1584 l->rcv_nxt = peers_snd_nxt;
1585}
1586
1587/* tipc_link_bc_sync_rcv - update rcv link according to peer's send state
1588 */
1589void tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
1590 struct sk_buff_head *xmitq)
1591{
1592 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
1593
1594 if (!link_is_up(l))
1595 return;
1596
1597 if (!msg_peer_node_is_up(hdr))
1598 return;
1599
1600 l->bc_peer_is_up = true;
1601
1602 /* Ignore if peers_snd_nxt goes beyond receive window */
1603 if (more(peers_snd_nxt, l->rcv_nxt + l->window))
1604 return;
1605
1606 if (!more(peers_snd_nxt, l->rcv_nxt)) {
1607 l->nack_state = BC_NACK_SND_CONDITIONAL;
1608 return;
1609 }
1610
1611 /* Don't NACK if one was recently sent or peeked */
1612 if (l->nack_state == BC_NACK_SND_SUPPRESS) {
1613 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
1614 return;
1615 }
1616
1617 /* Conditionally delay NACK sending until next synch rcv */
1618 if (l->nack_state == BC_NACK_SND_CONDITIONAL) {
1619 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
1620 if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN)
1621 return;
1622 }
1623
1624 /* Send NACK now but suppress next one */
1625 tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq);
1626 l->nack_state = BC_NACK_SND_SUPPRESS;
1627}
1628
1629void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked,
1630 struct sk_buff_head *xmitq)
1631{
1632 struct sk_buff *skb, *tmp;
1633 struct tipc_link *snd_l = l->bc_sndlink;
1634
1635 if (!link_is_up(l) || !l->bc_peer_is_up)
1636 return;
1637
1638 if (!more(acked, l->acked))
1639 return;
1640
1641 /* Skip over packets peer has already acked */
1642 skb_queue_walk(&snd_l->transmq, skb) {
1643 if (more(buf_seqno(skb), l->acked))
1644 break;
1645 }
1646
1647 /* Update/release the packets peer is acking now */
1648 skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) {
1649 if (more(buf_seqno(skb), acked))
1650 break;
1651 if (!--TIPC_SKB_CB(skb)->ackers) {
1652 __skb_unlink(skb, &snd_l->transmq);
1653 kfree_skb(skb);
1654 }
1655 }
1656 l->acked = acked;
1657 tipc_link_advance_backlog(snd_l, xmitq);
1658 if (unlikely(!skb_queue_empty(&snd_l->wakeupq)))
1659 link_prepare_wakeup(snd_l);
1660}
1661
1662/* tipc_link_bc_nack_rcv(): receive broadcast nack message
1663 */
1664int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
1665 struct sk_buff_head *xmitq)
1666{
1667 struct tipc_msg *hdr = buf_msg(skb);
1668 u32 dnode = msg_destnode(hdr);
1669 int mtyp = msg_type(hdr);
1670 u16 acked = msg_bcast_ack(hdr);
1671 u16 from = acked + 1;
1672 u16 to = msg_bcgap_to(hdr);
1673 u16 peers_snd_nxt = to + 1;
1674 int rc = 0;
1675
1676 kfree_skb(skb);
1677
1678 if (!tipc_link_is_up(l) || !l->bc_peer_is_up)
1679 return 0;
1680
1681 if (mtyp != STATE_MSG)
1682 return 0;
1683
1684 if (dnode == link_own_addr(l)) {
1685 tipc_link_bc_ack_rcv(l, acked, xmitq);
1686 rc = tipc_link_retrans(l->bc_sndlink, from, to, xmitq);
1687 l->stats.recv_nacks++;
1688 return rc;
1689 }
1690
1691 /* Msg for other node => suppress own NACK at next sync if applicable */
1692 if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from))
1693 l->nack_state = BC_NACK_SND_SUPPRESS;
1694
1695 return 0;
1696}
1697
Jon Paul Maloye3eea1e2015-03-13 16:08:11 -04001698void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001699{
Jon Paul Maloyed193ec2015-04-02 09:33:02 -04001700 int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE);
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -04001701
Jon Paul Maloye3eea1e2015-03-13 16:08:11 -04001702 l->window = win;
Jon Paul Maloy1f66d162015-03-25 12:07:24 -04001703 l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2;
1704 l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win;
1705 l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3;
1706 l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2;
1707 l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001708}
1709
Allan Stephens5c216e12011-10-18 11:34:29 -04001710/**
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001711 * link_reset_stats - reset link statistics
Jon Paul Maloy1a906322015-11-19 14:30:47 -05001712 * @l: pointer to link
Per Lidenb97bf3f2006-01-02 19:04:38 +01001713 */
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001714void tipc_link_reset_stats(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001715{
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001716 memset(&l->stats, 0, sizeof(l->stats));
1717 if (!link_is_bc_sndlink(l)) {
1718 l->stats.sent_info = l->snd_nxt;
1719 l->stats.recv_info = l->rcv_nxt;
1720 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001721}
1722
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001723static void link_print(struct tipc_link *l, const char *str)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001724{
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001725 struct sk_buff *hskb = skb_peek(&l->transmq);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001726 u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1;
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001727 u16 tail = l->snd_nxt - 1;
Ying Xue7a2f7d12014-04-21 10:55:46 +08001728
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001729 pr_info("%s Link <%s> state %x\n", str, l->name, l->state);
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001730 pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n",
1731 skb_queue_len(&l->transmq), head, tail,
1732 skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001733}
Richard Alpe0655f6a2014-11-20 10:29:07 +01001734
1735/* Parse and validate nested (link) properties valid for media, bearer and link
1736 */
1737int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
1738{
1739 int err;
1740
1741 err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop,
1742 tipc_nl_prop_policy);
1743 if (err)
1744 return err;
1745
1746 if (props[TIPC_NLA_PROP_PRIO]) {
1747 u32 prio;
1748
1749 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1750 if (prio > TIPC_MAX_LINK_PRI)
1751 return -EINVAL;
1752 }
1753
1754 if (props[TIPC_NLA_PROP_TOL]) {
1755 u32 tol;
1756
1757 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1758 if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
1759 return -EINVAL;
1760 }
1761
1762 if (props[TIPC_NLA_PROP_WIN]) {
1763 u32 win;
1764
1765 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1766 if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN))
1767 return -EINVAL;
1768 }
1769
1770 return 0;
1771}
Richard Alpe7be57fc2014-11-20 10:29:12 +01001772
Richard Alped8182802014-11-24 11:10:29 +01001773static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
Richard Alpe7be57fc2014-11-20 10:29:12 +01001774{
1775 int i;
1776 struct nlattr *stats;
1777
1778 struct nla_map {
1779 u32 key;
1780 u32 val;
1781 };
1782
1783 struct nla_map map[] = {
1784 {TIPC_NLA_STATS_RX_INFO, s->recv_info},
1785 {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments},
1786 {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented},
1787 {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles},
1788 {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled},
1789 {TIPC_NLA_STATS_TX_INFO, s->sent_info},
1790 {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments},
1791 {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented},
1792 {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles},
1793 {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled},
1794 {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ?
1795 s->msg_length_counts : 1},
1796 {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts},
1797 {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total},
1798 {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]},
1799 {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]},
1800 {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]},
1801 {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]},
1802 {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]},
1803 {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]},
1804 {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]},
1805 {TIPC_NLA_STATS_RX_STATES, s->recv_states},
1806 {TIPC_NLA_STATS_RX_PROBES, s->recv_probes},
1807 {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks},
1808 {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv},
1809 {TIPC_NLA_STATS_TX_STATES, s->sent_states},
1810 {TIPC_NLA_STATS_TX_PROBES, s->sent_probes},
1811 {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks},
1812 {TIPC_NLA_STATS_TX_ACKS, s->sent_acks},
1813 {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted},
1814 {TIPC_NLA_STATS_DUPLICATES, s->duplicates},
1815 {TIPC_NLA_STATS_LINK_CONGS, s->link_congs},
1816 {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz},
1817 {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ?
1818 (s->accu_queue_sz / s->queue_sz_counts) : 0}
1819 };
1820
1821 stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
1822 if (!stats)
1823 return -EMSGSIZE;
1824
1825 for (i = 0; i < ARRAY_SIZE(map); i++)
1826 if (nla_put_u32(skb, map[i].key, map[i].val))
1827 goto msg_full;
1828
1829 nla_nest_end(skb, stats);
1830
1831 return 0;
1832msg_full:
1833 nla_nest_cancel(skb, stats);
1834
1835 return -EMSGSIZE;
1836}
1837
1838/* Caller should hold appropriate locks to protect the link */
Jon Paul Maloy5be9c082015-11-19 14:30:45 -05001839int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
1840 struct tipc_link *link, int nlflags)
Richard Alpe7be57fc2014-11-20 10:29:12 +01001841{
1842 int err;
1843 void *hdr;
1844 struct nlattr *attrs;
1845 struct nlattr *prop;
Ying Xue34747532015-01-09 15:27:10 +08001846 struct tipc_net *tn = net_generic(net, tipc_net_id);
Richard Alpe7be57fc2014-11-20 10:29:12 +01001847
Richard Alpebfb3e5d2015-02-09 09:50:03 +01001848 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
Nicolas Dichtelf2f67392015-04-28 18:33:50 +02001849 nlflags, TIPC_NL_LINK_GET);
Richard Alpe7be57fc2014-11-20 10:29:12 +01001850 if (!hdr)
1851 return -EMSGSIZE;
1852
1853 attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
1854 if (!attrs)
1855 goto msg_full;
1856
1857 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name))
1858 goto attr_msg_full;
1859 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST,
Ying Xue34747532015-01-09 15:27:10 +08001860 tipc_cluster_mask(tn->own_addr)))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001861 goto attr_msg_full;
Jon Paul Maloyed193ec2015-04-02 09:33:02 -04001862 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001863 goto attr_msg_full;
Jon Paul Maloya97b9d32015-05-14 10:46:15 -04001864 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001865 goto attr_msg_full;
Jon Paul Maloya97b9d32015-05-14 10:46:15 -04001866 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001867 goto attr_msg_full;
1868
1869 if (tipc_link_is_up(link))
1870 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
1871 goto attr_msg_full;
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001872 if (link->active)
Richard Alpe7be57fc2014-11-20 10:29:12 +01001873 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE))
1874 goto attr_msg_full;
1875
1876 prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
1877 if (!prop)
1878 goto attr_msg_full;
1879 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
1880 goto prop_msg_full;
1881 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance))
1882 goto prop_msg_full;
1883 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN,
Jon Paul Maloy1f66d162015-03-25 12:07:24 -04001884 link->window))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001885 goto prop_msg_full;
1886 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
1887 goto prop_msg_full;
1888 nla_nest_end(msg->skb, prop);
1889
1890 err = __tipc_nl_add_stats(msg->skb, &link->stats);
1891 if (err)
1892 goto attr_msg_full;
1893
1894 nla_nest_end(msg->skb, attrs);
1895 genlmsg_end(msg->skb, hdr);
1896
1897 return 0;
1898
1899prop_msg_full:
1900 nla_nest_cancel(msg->skb, prop);
1901attr_msg_full:
1902 nla_nest_cancel(msg->skb, attrs);
1903msg_full:
1904 genlmsg_cancel(msg->skb, hdr);
1905
1906 return -EMSGSIZE;
1907}
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001908
1909static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb,
1910 struct tipc_stats *stats)
1911{
1912 int i;
1913 struct nlattr *nest;
1914
1915 struct nla_map {
1916 __u32 key;
1917 __u32 val;
1918 };
1919
1920 struct nla_map map[] = {
1921 {TIPC_NLA_STATS_RX_INFO, stats->recv_info},
1922 {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments},
1923 {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented},
1924 {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles},
1925 {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled},
1926 {TIPC_NLA_STATS_TX_INFO, stats->sent_info},
1927 {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments},
1928 {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented},
1929 {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles},
1930 {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled},
1931 {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks},
1932 {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv},
1933 {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks},
1934 {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks},
1935 {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted},
1936 {TIPC_NLA_STATS_DUPLICATES, stats->duplicates},
1937 {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs},
1938 {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz},
1939 {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ?
1940 (stats->accu_queue_sz / stats->queue_sz_counts) : 0}
1941 };
1942
1943 nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
1944 if (!nest)
1945 return -EMSGSIZE;
1946
1947 for (i = 0; i < ARRAY_SIZE(map); i++)
1948 if (nla_put_u32(skb, map[i].key, map[i].val))
1949 goto msg_full;
1950
1951 nla_nest_end(skb, nest);
1952
1953 return 0;
1954msg_full:
1955 nla_nest_cancel(skb, nest);
1956
1957 return -EMSGSIZE;
1958}
1959
1960int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg)
1961{
1962 int err;
1963 void *hdr;
1964 struct nlattr *attrs;
1965 struct nlattr *prop;
1966 struct tipc_net *tn = net_generic(net, tipc_net_id);
1967 struct tipc_link *bcl = tn->bcl;
1968
1969 if (!bcl)
1970 return 0;
1971
1972 tipc_bcast_lock(net);
1973
1974 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1975 NLM_F_MULTI, TIPC_NL_LINK_GET);
1976 if (!hdr)
1977 return -EMSGSIZE;
1978
1979 attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
1980 if (!attrs)
1981 goto msg_full;
1982
1983 /* The broadcast link is always up */
1984 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
1985 goto attr_msg_full;
1986
1987 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST))
1988 goto attr_msg_full;
1989 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name))
1990 goto attr_msg_full;
1991 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, bcl->rcv_nxt))
1992 goto attr_msg_full;
1993 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, bcl->snd_nxt))
1994 goto attr_msg_full;
1995
1996 prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
1997 if (!prop)
1998 goto attr_msg_full;
1999 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window))
2000 goto prop_msg_full;
2001 nla_nest_end(msg->skb, prop);
2002
2003 err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats);
2004 if (err)
2005 goto attr_msg_full;
2006
2007 tipc_bcast_unlock(net);
2008 nla_nest_end(msg->skb, attrs);
2009 genlmsg_end(msg->skb, hdr);
2010
2011 return 0;
2012
2013prop_msg_full:
2014 nla_nest_cancel(msg->skb, prop);
2015attr_msg_full:
2016 nla_nest_cancel(msg->skb, attrs);
2017msg_full:
2018 tipc_bcast_unlock(net);
2019 genlmsg_cancel(msg->skb, hdr);
2020
2021 return -EMSGSIZE;
2022}
2023
2024void tipc_link_set_tolerance(struct tipc_link *l, u32 tol)
2025{
2026 l->tolerance = tol;
2027 tipc_link_proto_xmit(l, STATE_MSG, 0, 0, tol, 0);
2028}
2029
2030void tipc_link_set_prio(struct tipc_link *l, u32 prio)
2031{
2032 l->priority = prio;
2033 tipc_link_proto_xmit(l, STATE_MSG, 0, 0, 0, prio);
2034}
2035
2036void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit)
2037{
2038 l->abort_limit = limit;
2039}