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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
Erik Hugne2cf8aa12012-06-29 00:16:37 -040048/*
49 * Error message prefixes
50 */
Jon Paul Maloy6e498152015-07-30 18:24:19 -040051static const char *link_co_err = "Link tunneling error, ";
Erik Hugne2cf8aa12012-06-29 00:16:37 -040052static const char *link_rst_msg = "Resetting link ";
Jon Paul Maloy32301902015-10-22 08:51:37 -040053static const char tipc_bclink_name[] = "broadcast-link";
Per Lidenb97bf3f2006-01-02 19:04:38 +010054
Richard Alpe7be57fc2014-11-20 10:29:12 +010055static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
56 [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC },
57 [TIPC_NLA_LINK_NAME] = {
58 .type = NLA_STRING,
59 .len = TIPC_MAX_LINK_NAME
60 },
61 [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 },
62 [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG },
63 [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG },
64 [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG },
65 [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED },
66 [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED },
67 [TIPC_NLA_LINK_RX] = { .type = NLA_U32 },
68 [TIPC_NLA_LINK_TX] = { .type = NLA_U32 }
69};
70
Richard Alpe0655f6a2014-11-20 10:29:07 +010071/* Properties valid for media, bearar and link */
72static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
73 [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC },
74 [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 },
75 [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 },
76 [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 }
77};
78
Jon Paul Maloy52666982015-10-22 08:51:41 -040079/* Send states for broadcast NACKs
80 */
81enum {
82 BC_NACK_SND_CONDITIONAL,
83 BC_NACK_SND_UNCONDITIONAL,
84 BC_NACK_SND_SUPPRESS,
85};
86
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090087/*
Jon Paul Maloyd9992972015-07-16 16:54:31 -040088 * Interval between NACKs when packets arrive out of order
89 */
90#define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2)
91/*
Allan Stephensa686e682008-06-04 17:29:39 -070092 * Out-of-range value for link session numbers
93 */
Jon Paul Maloyd3504c32015-07-16 16:54:25 -040094#define WILDCARD_SESSION 0x10000
Allan Stephensa686e682008-06-04 17:29:39 -070095
Jon Paul Maloy662921c2015-07-30 18:24:21 -040096/* Link FSM states:
Jon Paul Maloyd3504c32015-07-16 16:54:25 -040097 */
98enum {
Jon Paul Maloy662921c2015-07-30 18:24:21 -040099 LINK_ESTABLISHED = 0xe,
100 LINK_ESTABLISHING = 0xe << 4,
101 LINK_RESET = 0x1 << 8,
102 LINK_RESETTING = 0x2 << 12,
103 LINK_PEER_RESET = 0xd << 16,
104 LINK_FAILINGOVER = 0xf << 20,
105 LINK_SYNCHING = 0xc << 24
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400106};
107
108/* Link FSM state checking routines
109 */
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400110static int link_is_up(struct tipc_link *l)
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400111{
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400112 return l->state & (LINK_ESTABLISHED | LINK_SYNCHING);
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400113}
114
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400115static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
116 struct sk_buff_head *xmitq);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -0400117static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
118 u16 rcvgap, int tolerance, int priority,
119 struct sk_buff_head *xmitq);
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500120static void link_reset_statistics(struct tipc_link *l_ptr);
121static void link_print(struct tipc_link *l_ptr, const char *str);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400122static void tipc_link_build_nack_msg(struct tipc_link *l,
123 struct sk_buff_head *xmitq);
124static void tipc_link_build_bc_init_msg(struct tipc_link *l,
125 struct sk_buff_head *xmitq);
126static bool tipc_link_release_pkts(struct tipc_link *l, u16 to);
Jon Paul Maloy8b4ed862015-03-25 12:07:26 -0400127
Per Lidenb97bf3f2006-01-02 19:04:38 +0100128/*
Sam Ravnborg05790c62006-03-20 22:37:04 -0800129 * Simple non-static link routines (i.e. referenced outside this file)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100130 */
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400131bool tipc_link_is_up(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100132{
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400133 return link_is_up(l);
134}
135
Jon Paul Maloyc8199302015-10-15 14:52:46 -0400136bool tipc_link_peer_is_down(struct tipc_link *l)
137{
138 return l->state == LINK_PEER_RESET;
139}
140
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400141bool tipc_link_is_reset(struct tipc_link *l)
142{
143 return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING);
144}
145
Jon Paul Maloy73f646c2015-10-15 14:52:44 -0400146bool tipc_link_is_establishing(struct tipc_link *l)
147{
148 return l->state == LINK_ESTABLISHING;
149}
150
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400151bool tipc_link_is_synching(struct tipc_link *l)
152{
153 return l->state == LINK_SYNCHING;
154}
155
156bool tipc_link_is_failingover(struct tipc_link *l)
157{
158 return l->state == LINK_FAILINGOVER;
159}
160
161bool tipc_link_is_blocked(struct tipc_link *l)
162{
163 return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100164}
165
Jon Paul Maloy52666982015-10-22 08:51:41 -0400166bool link_is_bc_sndlink(struct tipc_link *l)
167{
168 return !l->bc_sndlink;
169}
170
171bool link_is_bc_rcvlink(struct tipc_link *l)
172{
173 return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l));
174}
175
Jon Paul Maloy9d13ec62015-07-16 16:54:19 -0400176int tipc_link_is_active(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100177{
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400178 return l->active;
179}
Jon Paul Maloy9d13ec62015-07-16 16:54:19 -0400180
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400181void tipc_link_set_active(struct tipc_link *l, bool active)
182{
183 l->active = active;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100184}
185
Jon Paul Maloy52666982015-10-22 08:51:41 -0400186void tipc_link_add_bc_peer(struct tipc_link *snd_l,
187 struct tipc_link *uc_l,
188 struct sk_buff_head *xmitq)
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400189{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400190 struct tipc_link *rcv_l = uc_l->bc_rcvlink;
191
192 snd_l->ackers++;
193 rcv_l->acked = snd_l->snd_nxt - 1;
194 tipc_link_build_bc_init_msg(uc_l, xmitq);
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400195}
196
Jon Paul Maloy52666982015-10-22 08:51:41 -0400197void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
198 struct tipc_link *rcv_l,
199 struct sk_buff_head *xmitq)
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400200{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400201 u16 ack = snd_l->snd_nxt - 1;
202
203 snd_l->ackers--;
204 tipc_link_bc_ack_rcv(rcv_l, ack, xmitq);
205 tipc_link_reset(rcv_l);
206 rcv_l->state = LINK_RESET;
207 if (!snd_l->ackers) {
208 tipc_link_reset(snd_l);
209 __skb_queue_purge(xmitq);
210 }
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400211}
212
213int tipc_link_bc_peers(struct tipc_link *l)
214{
215 return l->ackers;
216}
217
Jon Paul Maloy959e1782015-10-22 08:51:43 -0400218void tipc_link_set_mtu(struct tipc_link *l, int mtu)
219{
220 l->mtu = mtu;
221}
222
223int tipc_link_mtu(struct tipc_link *l)
224{
225 return l->mtu;
226}
227
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400228static u32 link_own_addr(struct tipc_link *l)
229{
230 return msg_prevnode(l->pmsg);
231}
232
Per Lidenb97bf3f2006-01-02 19:04:38 +0100233/**
Per Liden4323add2006-01-18 00:38:21 +0100234 * tipc_link_create - create a new link
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400235 * @n: pointer to associated node
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400236 * @if_name: associated interface name
237 * @bearer_id: id (index) of associated bearer
238 * @tolerance: link tolerance to be used by link
239 * @net_plane: network plane (A,B,c..) this link belongs to
240 * @mtu: mtu to be advertised by link
241 * @priority: priority to be used by link
242 * @window: send window to be used by link
243 * @session: session to be used by link
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400244 * @ownnode: identity of own node
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400245 * @peer: node id of peer node
Jon Paul Maloyfd556f22015-10-22 08:51:40 -0400246 * @peer_caps: bitmap describing peer node capabilities
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400247 * @maddr: media address to be used
Jon Paul Maloy52666982015-10-22 08:51:41 -0400248 * @bc_sndlink: the namespace global link used for broadcast sending
249 * @bc_rcvlink: the peer specific link used for broadcast reception
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400250 * @inputq: queue to put messages ready for delivery
251 * @namedq: queue to put binding table update messages ready for delivery
252 * @link: return value, pointer to put the created link
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900253 *
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400254 * Returns true if link was created, otherwise false
Per Lidenb97bf3f2006-01-02 19:04:38 +0100255 */
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400256bool tipc_link_create(struct net *net, char *if_name, int bearer_id,
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400257 int tolerance, char net_plane, u32 mtu, int priority,
258 int window, u32 session, u32 ownnode, u32 peer,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400259 u16 peer_caps,
260 struct tipc_media_addr *maddr,
261 struct tipc_link *bc_sndlink,
262 struct tipc_link *bc_rcvlink,
263 struct sk_buff_head *inputq,
264 struct sk_buff_head *namedq,
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400265 struct tipc_link **link)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100266{
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400267 struct tipc_link *l;
268 struct tipc_msg *hdr;
Allan Stephens37b9c082011-02-28 11:32:27 -0500269
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400270 l = kzalloc(sizeof(*l), GFP_ATOMIC);
271 if (!l)
272 return false;
273 *link = l;
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400274 l->pmsg = (struct tipc_msg *)&l->proto_msg;
275 hdr = l->pmsg;
276 tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer);
277 msg_set_size(hdr, sizeof(l->proto_msg));
278 msg_set_session(hdr, session);
279 msg_set_bearer_id(hdr, l->bearer_id);
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400280
281 /* Note: peer i/f name is completed by reset/activate message */
282 sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
283 tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode),
284 if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400285 strcpy((char *)msg_data(hdr), if_name);
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400286
287 l->addr = peer;
Jon Paul Maloyfd556f22015-10-22 08:51:40 -0400288 l->peer_caps = peer_caps;
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400289 l->media_addr = maddr;
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400290 l->net = net;
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400291 l->peer_session = WILDCARD_SESSION;
292 l->bearer_id = bearer_id;
293 l->tolerance = tolerance;
294 l->net_plane = net_plane;
295 l->advertised_mtu = mtu;
296 l->mtu = mtu;
297 l->priority = priority;
298 tipc_link_set_queue_limits(l, window);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400299 l->ackers = 1;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400300 l->bc_sndlink = bc_sndlink;
301 l->bc_rcvlink = bc_rcvlink;
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400302 l->inputq = inputq;
303 l->namedq = namedq;
304 l->state = LINK_RESETTING;
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400305 __skb_queue_head_init(&l->transmq);
306 __skb_queue_head_init(&l->backlogq);
307 __skb_queue_head_init(&l->deferdq);
308 skb_queue_head_init(&l->wakeupq);
309 skb_queue_head_init(l->inputq);
310 return true;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100311}
312
Jon Paul Maloy32301902015-10-22 08:51:37 -0400313/**
314 * tipc_link_bc_create - create new link to be used for broadcast
315 * @n: pointer to associated node
316 * @mtu: mtu to be used
317 * @window: send window to be used
318 * @inputq: queue to put messages ready for delivery
319 * @namedq: queue to put binding table update messages ready for delivery
320 * @link: return value, pointer to put the created link
321 *
322 * Returns true if link was created, otherwise false
323 */
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400324bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400325 int mtu, int window, u16 peer_caps,
Jon Paul Maloy32301902015-10-22 08:51:37 -0400326 struct sk_buff_head *inputq,
327 struct sk_buff_head *namedq,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400328 struct tipc_link *bc_sndlink,
Jon Paul Maloy32301902015-10-22 08:51:37 -0400329 struct tipc_link **link)
330{
331 struct tipc_link *l;
332
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400333 if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400334 0, ownnode, peer, peer_caps, NULL, bc_sndlink,
335 NULL, inputq, namedq, link))
Jon Paul Maloy32301902015-10-22 08:51:37 -0400336 return false;
337
338 l = *link;
339 strcpy(l->name, tipc_bclink_name);
340 tipc_link_reset(l);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400341 l->state = LINK_RESET;
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400342 l->ackers = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400343 l->bc_rcvlink = l;
344
345 /* Broadcast send link is always up */
346 if (link_is_bc_sndlink(l))
347 l->state = LINK_ESTABLISHED;
348
Jon Paul Maloy32301902015-10-22 08:51:37 -0400349 return true;
350}
351
Per Lidenb97bf3f2006-01-02 19:04:38 +0100352/**
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400353 * tipc_link_fsm_evt - link finite state machine
354 * @l: pointer to link
355 * @evt: state machine event to be processed
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400356 */
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400357int tipc_link_fsm_evt(struct tipc_link *l, int evt)
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400358{
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400359 int rc = 0;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400360
361 switch (l->state) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400362 case LINK_RESETTING:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400363 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400364 case LINK_PEER_RESET_EVT:
365 l->state = LINK_PEER_RESET;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400366 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400367 case LINK_RESET_EVT:
368 l->state = LINK_RESET;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400369 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400370 case LINK_FAILURE_EVT:
371 case LINK_FAILOVER_BEGIN_EVT:
372 case LINK_ESTABLISH_EVT:
373 case LINK_FAILOVER_END_EVT:
374 case LINK_SYNCH_BEGIN_EVT:
375 case LINK_SYNCH_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400376 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400377 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400378 }
379 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400380 case LINK_RESET:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400381 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400382 case LINK_PEER_RESET_EVT:
383 l->state = LINK_ESTABLISHING;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400384 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400385 case LINK_FAILOVER_BEGIN_EVT:
386 l->state = LINK_FAILINGOVER;
387 case LINK_FAILURE_EVT:
388 case LINK_RESET_EVT:
389 case LINK_ESTABLISH_EVT:
390 case LINK_FAILOVER_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400391 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400392 case LINK_SYNCH_BEGIN_EVT:
393 case LINK_SYNCH_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400394 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400395 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400396 }
397 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400398 case LINK_PEER_RESET:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400399 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400400 case LINK_RESET_EVT:
401 l->state = LINK_ESTABLISHING;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400402 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400403 case LINK_PEER_RESET_EVT:
404 case LINK_ESTABLISH_EVT:
405 case LINK_FAILURE_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400406 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400407 case LINK_SYNCH_BEGIN_EVT:
408 case LINK_SYNCH_END_EVT:
409 case LINK_FAILOVER_BEGIN_EVT:
410 case LINK_FAILOVER_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400411 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400412 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400413 }
414 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400415 case LINK_FAILINGOVER:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400416 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400417 case LINK_FAILOVER_END_EVT:
418 l->state = LINK_RESET;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400419 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400420 case LINK_PEER_RESET_EVT:
421 case LINK_RESET_EVT:
422 case LINK_ESTABLISH_EVT:
423 case LINK_FAILURE_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400424 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400425 case LINK_FAILOVER_BEGIN_EVT:
426 case LINK_SYNCH_BEGIN_EVT:
427 case LINK_SYNCH_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400428 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400429 goto illegal_evt;
430 }
431 break;
432 case LINK_ESTABLISHING:
433 switch (evt) {
434 case LINK_ESTABLISH_EVT:
435 l->state = LINK_ESTABLISHED;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400436 break;
437 case LINK_FAILOVER_BEGIN_EVT:
438 l->state = LINK_FAILINGOVER;
439 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400440 case LINK_RESET_EVT:
Jon Paul Maloy73f646c2015-10-15 14:52:44 -0400441 l->state = LINK_RESET;
442 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400443 case LINK_FAILURE_EVT:
Jon Paul Maloy73f646c2015-10-15 14:52:44 -0400444 case LINK_PEER_RESET_EVT:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400445 case LINK_SYNCH_BEGIN_EVT:
446 case LINK_FAILOVER_END_EVT:
447 break;
448 case LINK_SYNCH_END_EVT:
449 default:
450 goto illegal_evt;
451 }
452 break;
453 case LINK_ESTABLISHED:
454 switch (evt) {
455 case LINK_PEER_RESET_EVT:
456 l->state = LINK_PEER_RESET;
457 rc |= TIPC_LINK_DOWN_EVT;
458 break;
459 case LINK_FAILURE_EVT:
460 l->state = LINK_RESETTING;
461 rc |= TIPC_LINK_DOWN_EVT;
462 break;
463 case LINK_RESET_EVT:
464 l->state = LINK_RESET;
465 break;
466 case LINK_ESTABLISH_EVT:
Jon Paul Maloy5ae2f8e2015-08-20 02:12:55 -0400467 case LINK_SYNCH_END_EVT:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400468 break;
469 case LINK_SYNCH_BEGIN_EVT:
470 l->state = LINK_SYNCHING;
471 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400472 case LINK_FAILOVER_BEGIN_EVT:
473 case LINK_FAILOVER_END_EVT:
474 default:
475 goto illegal_evt;
476 }
477 break;
478 case LINK_SYNCHING:
479 switch (evt) {
480 case LINK_PEER_RESET_EVT:
481 l->state = LINK_PEER_RESET;
482 rc |= TIPC_LINK_DOWN_EVT;
483 break;
484 case LINK_FAILURE_EVT:
485 l->state = LINK_RESETTING;
486 rc |= TIPC_LINK_DOWN_EVT;
487 break;
488 case LINK_RESET_EVT:
489 l->state = LINK_RESET;
490 break;
491 case LINK_ESTABLISH_EVT:
492 case LINK_SYNCH_BEGIN_EVT:
493 break;
494 case LINK_SYNCH_END_EVT:
495 l->state = LINK_ESTABLISHED;
496 break;
497 case LINK_FAILOVER_BEGIN_EVT:
498 case LINK_FAILOVER_END_EVT:
499 default:
500 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400501 }
502 break;
503 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400504 pr_err("Unknown FSM state %x in %s\n", l->state, l->name);
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400505 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400506 return rc;
507illegal_evt:
508 pr_err("Illegal FSM event %x in state %x on link %s\n",
509 evt, l->state, l->name);
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400510 return rc;
511}
512
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400513/* link_profile_stats - update statistical profiling of traffic
514 */
515static void link_profile_stats(struct tipc_link *l)
516{
517 struct sk_buff *skb;
518 struct tipc_msg *msg;
519 int length;
520
521 /* Update counters used in statistical profiling of send traffic */
522 l->stats.accu_queue_sz += skb_queue_len(&l->transmq);
523 l->stats.queue_sz_counts++;
524
525 skb = skb_peek(&l->transmq);
526 if (!skb)
527 return;
528 msg = buf_msg(skb);
529 length = msg_size(msg);
530
531 if (msg_user(msg) == MSG_FRAGMENTER) {
532 if (msg_type(msg) != FIRST_FRAGMENT)
533 return;
534 length = msg_size(msg_get_wrapped(msg));
535 }
536 l->stats.msg_lengths_total += length;
537 l->stats.msg_length_counts++;
538 if (length <= 64)
539 l->stats.msg_length_profile[0]++;
540 else if (length <= 256)
541 l->stats.msg_length_profile[1]++;
542 else if (length <= 1024)
543 l->stats.msg_length_profile[2]++;
544 else if (length <= 4096)
545 l->stats.msg_length_profile[3]++;
546 else if (length <= 16384)
547 l->stats.msg_length_profile[4]++;
548 else if (length <= 32768)
549 l->stats.msg_length_profile[5]++;
550 else
551 l->stats.msg_length_profile[6]++;
552}
553
554/* tipc_link_timeout - perform periodic task as instructed from node timeout
555 */
Jon Paul Maloy52666982015-10-22 08:51:41 -0400556/* tipc_link_timeout - perform periodic task as instructed from node timeout
557 */
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400558int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
559{
560 int rc = 0;
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400561 int mtyp = STATE_MSG;
562 bool xmit = false;
563 bool prb = false;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400564 u16 bc_snt = l->bc_sndlink->snd_nxt - 1;
565 u16 bc_acked = l->bc_rcvlink->acked;
566 bool bc_up = link_is_up(l->bc_rcvlink);
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400567
568 link_profile_stats(l);
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400569
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400570 switch (l->state) {
571 case LINK_ESTABLISHED:
572 case LINK_SYNCHING:
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400573 if (!l->silent_intv_cnt) {
Jon Paul Maloy52666982015-10-22 08:51:41 -0400574 if (bc_up && (bc_acked != bc_snt))
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400575 xmit = true;
576 } else if (l->silent_intv_cnt <= l->abort_limit) {
577 xmit = true;
578 prb = true;
579 } else {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400580 rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400581 }
582 l->silent_intv_cnt++;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400583 break;
584 case LINK_RESET:
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400585 xmit = true;
586 mtyp = RESET_MSG;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400587 break;
588 case LINK_ESTABLISHING:
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400589 xmit = true;
590 mtyp = ACTIVATE_MSG;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400591 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400592 case LINK_PEER_RESET:
Jon Paul Maloy598411d2015-07-30 18:24:23 -0400593 case LINK_RESETTING:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400594 case LINK_FAILINGOVER:
595 break;
596 default:
597 break;
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400598 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400599
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400600 if (xmit)
601 tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq);
602
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400603 return rc;
604}
605
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400606/**
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400607 * link_schedule_user - schedule a message sender for wakeup after congestion
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400608 * @link: congested link
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400609 * @list: message that was attempted sent
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400610 * Create pseudo msg to send back to user when congestion abates
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400611 * Does not consume buffer list
Per Lidenb97bf3f2006-01-02 19:04:38 +0100612 */
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400613static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100614{
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400615 struct tipc_msg *msg = buf_msg(skb_peek(list));
616 int imp = msg_importance(msg);
617 u32 oport = msg_origport(msg);
618 u32 addr = link_own_addr(link);
619 struct sk_buff *skb;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100620
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400621 /* This really cannot happen... */
622 if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) {
623 pr_warn("%s<%s>, send queue full", link_rst_msg, link->name);
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400624 return -ENOBUFS;
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400625 }
626 /* Non-blocking sender: */
627 if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending)
628 return -ELINKCONG;
629
630 /* Create and schedule wakeup pseudo message */
631 skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0,
632 addr, addr, oport, 0, 0);
633 if (!skb)
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400634 return -ENOBUFS;
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400635 TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list);
636 TIPC_SKB_CB(skb)->chain_imp = imp;
637 skb_queue_tail(&link->wakeupq, skb);
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400638 link->stats.link_congs++;
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400639 return -ELINKCONG;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100640}
641
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400642/**
643 * link_prepare_wakeup - prepare users for wakeup after congestion
644 * @link: congested link
645 * Move a number of waiting users, as permitted by available space in
646 * the send queue, from link wait queue to node wait queue for wakeup
647 */
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400648void link_prepare_wakeup(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100649{
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400650 int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,};
651 int imp, lim;
Ying Xue58d78b32014-11-26 11:41:51 +0800652 struct sk_buff *skb, *tmp;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100653
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400654 skb_queue_walk_safe(&l->wakeupq, skb, tmp) {
655 imp = TIPC_SKB_CB(skb)->chain_imp;
656 lim = l->window + l->backlog[imp].limit;
657 pnd[imp] += TIPC_SKB_CB(skb)->chain_sz;
658 if ((pnd[imp] + l->backlog[imp].len) >= lim)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100659 break;
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400660 skb_unlink(skb, &l->wakeupq);
Jon Paul Maloyd39bbd42015-07-16 16:54:21 -0400661 skb_queue_tail(l->inputq, skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100662 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100663}
664
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900665/**
Per Liden4323add2006-01-18 00:38:21 +0100666 * tipc_link_reset_fragments - purge link's inbound message fragments queue
Per Lidenb97bf3f2006-01-02 19:04:38 +0100667 * @l_ptr: pointer to link
668 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500669void tipc_link_reset_fragments(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100670{
Jon Paul Maloy37e22162014-05-14 05:39:12 -0400671 kfree_skb(l_ptr->reasm_buf);
672 l_ptr->reasm_buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100673}
674
Jon Paul Maloy7d967b62015-06-28 09:44:44 -0400675void tipc_link_purge_backlog(struct tipc_link *l)
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400676{
677 __skb_queue_purge(&l->backlogq);
678 l->backlog[TIPC_LOW_IMPORTANCE].len = 0;
679 l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0;
680 l->backlog[TIPC_HIGH_IMPORTANCE].len = 0;
681 l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0;
682 l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0;
683}
684
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900685/**
Jon Paul Maloy581465f2014-01-07 17:02:44 -0500686 * tipc_link_purge_queues - purge all pkt queues associated with link
Per Lidenb97bf3f2006-01-02 19:04:38 +0100687 * @l_ptr: pointer to link
688 */
Jon Paul Maloy581465f2014-01-07 17:02:44 -0500689void tipc_link_purge_queues(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100690{
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400691 __skb_queue_purge(&l_ptr->deferdq);
692 __skb_queue_purge(&l_ptr->transmq);
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400693 tipc_link_purge_backlog(l_ptr);
Per Liden4323add2006-01-18 00:38:21 +0100694 tipc_link_reset_fragments(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100695}
696
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400697void tipc_link_reset(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100698{
Allan Stephensa686e682008-06-04 17:29:39 -0700699 /* Link is down, accept any session */
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400700 l->peer_session = WILDCARD_SESSION;
701
702 /* If peer is up, it only accepts an incremented session number */
703 msg_set_session(l->pmsg, msg_session(l->pmsg) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100704
Jon Paul Maloyed193ec2015-04-02 09:33:02 -0400705 /* Prepare for renewed mtu size negotiation */
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400706 l->mtu = l->advertised_mtu;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900707
Jon Paul Maloy23d83352015-07-30 18:24:24 -0400708 /* Clean up all queues: */
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400709 __skb_queue_purge(&l->transmq);
710 __skb_queue_purge(&l->deferdq);
Jon Paul Maloy23d83352015-07-30 18:24:24 -0400711 skb_queue_splice_init(&l->wakeupq, l->inputq);
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400712
713 tipc_link_purge_backlog(l);
714 kfree_skb(l->reasm_buf);
715 kfree_skb(l->failover_reasm_skb);
716 l->reasm_buf = NULL;
717 l->failover_reasm_skb = NULL;
718 l->rcv_unacked = 0;
719 l->snd_nxt = 1;
720 l->rcv_nxt = 1;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400721 l->acked = 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400722 l->silent_intv_cnt = 0;
723 l->stats.recv_info = 0;
724 l->stale_count = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400725 l->bc_peer_is_up = false;
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400726 link_reset_statistics(l);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100727}
728
Per Lidenb97bf3f2006-01-02 19:04:38 +0100729/**
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -0400730 * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500731 * @link: link to use
Ying Xuea6ca1092014-11-26 11:41:55 +0800732 * @list: chain of buffers containing message
733 *
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400734 * Consumes the buffer chain, except when returning an error code,
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400735 * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
736 * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500737 */
Ying Xue7f9f95d2015-01-09 15:27:06 +0800738int __tipc_link_xmit(struct net *net, struct tipc_link *link,
739 struct sk_buff_head *list)
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500740{
Ying Xuea6ca1092014-11-26 11:41:55 +0800741 struct tipc_msg *msg = buf_msg(skb_peek(list));
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400742 unsigned int maxwin = link->window;
Jon Paul Maloyf21e8972015-05-14 10:46:17 -0400743 unsigned int i, imp = msg_importance(msg);
Jon Paul Maloyed193ec2015-04-02 09:33:02 -0400744 uint mtu = link->mtu;
Jon Paul Maloya97b9d32015-05-14 10:46:15 -0400745 u16 ack = mod(link->rcv_nxt - 1);
746 u16 seqno = link->snd_nxt;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400747 u16 bc_ack = link->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400748 struct tipc_media_addr *addr = link->media_addr;
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400749 struct sk_buff_head *transmq = &link->transmq;
750 struct sk_buff_head *backlogq = &link->backlogq;
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -0400751 struct sk_buff *skb, *bskb;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500752
Jon Paul Maloyf21e8972015-05-14 10:46:17 -0400753 /* Match msg importance against this and all higher backlog limits: */
754 for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) {
755 if (unlikely(link->backlog[i].len >= link->backlog[i].limit))
756 return link_schedule_user(link, list);
757 }
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400758 if (unlikely(msg_size(msg) > mtu))
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500759 return -EMSGSIZE;
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400760
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400761 /* Prepare each packet for sending, and add to relevant queue: */
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -0400762 while (skb_queue_len(list)) {
763 skb = skb_peek(list);
Ying Xue58dc55f2014-11-26 11:41:52 +0800764 msg = buf_msg(skb);
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400765 msg_set_seqno(msg, seqno);
766 msg_set_ack(msg, ack);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400767 msg_set_bcast_ack(msg, bc_ack);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500768
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400769 if (likely(skb_queue_len(transmq) < maxwin)) {
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -0400770 __skb_dequeue(list);
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400771 __skb_queue_tail(transmq, skb);
772 tipc_bearer_send(net, link->bearer_id, skb, addr);
773 link->rcv_unacked = 0;
774 seqno++;
775 continue;
776 }
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -0400777 if (tipc_msg_bundle(skb_peek_tail(backlogq), msg, mtu)) {
778 kfree_skb(__skb_dequeue(list));
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500779 link->stats.sent_bundled++;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500780 continue;
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400781 }
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -0400782 if (tipc_msg_make_bundle(&bskb, msg, mtu, link->addr)) {
783 kfree_skb(__skb_dequeue(list));
784 __skb_queue_tail(backlogq, bskb);
785 link->backlog[msg_importance(buf_msg(bskb))].len++;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500786 link->stats.sent_bundled++;
787 link->stats.sent_bundles++;
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -0400788 continue;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500789 }
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -0400790 link->backlog[imp].len += skb_queue_len(list);
791 skb_queue_splice_tail_init(list, backlogq);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500792 }
Jon Paul Maloya97b9d32015-05-14 10:46:15 -0400793 link->snd_nxt = seqno;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500794 return 0;
795}
796
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400797/**
798 * tipc_link_xmit(): enqueue buffer list according to queue situation
799 * @link: link to use
800 * @list: chain of buffers containing message
801 * @xmitq: returned list of packets to be sent by caller
802 *
803 * Consumes the buffer chain, except when returning -ELINKCONG,
804 * since the caller then may want to make more send attempts.
805 * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
806 * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
807 */
808int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
809 struct sk_buff_head *xmitq)
810{
811 struct tipc_msg *hdr = buf_msg(skb_peek(list));
812 unsigned int maxwin = l->window;
813 unsigned int i, imp = msg_importance(hdr);
814 unsigned int mtu = l->mtu;
815 u16 ack = l->rcv_nxt - 1;
816 u16 seqno = l->snd_nxt;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400817 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400818 struct sk_buff_head *transmq = &l->transmq;
819 struct sk_buff_head *backlogq = &l->backlogq;
820 struct sk_buff *skb, *_skb, *bskb;
821
822 /* Match msg importance against this and all higher backlog limits: */
823 for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) {
824 if (unlikely(l->backlog[i].len >= l->backlog[i].limit))
825 return link_schedule_user(l, list);
826 }
827 if (unlikely(msg_size(hdr) > mtu))
828 return -EMSGSIZE;
829
830 /* Prepare each packet for sending, and add to relevant queue: */
831 while (skb_queue_len(list)) {
832 skb = skb_peek(list);
833 hdr = buf_msg(skb);
834 msg_set_seqno(hdr, seqno);
835 msg_set_ack(hdr, ack);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400836 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400837
838 if (likely(skb_queue_len(transmq) < maxwin)) {
839 _skb = skb_clone(skb, GFP_ATOMIC);
840 if (!_skb)
841 return -ENOBUFS;
842 __skb_dequeue(list);
843 __skb_queue_tail(transmq, skb);
844 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400845 TIPC_SKB_CB(skb)->ackers = l->ackers;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400846 l->rcv_unacked = 0;
847 seqno++;
848 continue;
849 }
850 if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) {
851 kfree_skb(__skb_dequeue(list));
852 l->stats.sent_bundled++;
853 continue;
854 }
855 if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) {
856 kfree_skb(__skb_dequeue(list));
857 __skb_queue_tail(backlogq, bskb);
858 l->backlog[msg_importance(buf_msg(bskb))].len++;
859 l->stats.sent_bundled++;
860 l->stats.sent_bundles++;
861 continue;
862 }
863 l->backlog[imp].len += skb_queue_len(list);
864 skb_queue_splice_tail_init(list, backlogq);
865 }
866 l->snd_nxt = seqno;
867 return 0;
868}
869
Jon Maloyc64f7a62012-11-16 13:51:31 +0800870/*
Ying Xue47b4c9a2014-11-26 11:41:48 +0800871 * tipc_link_push_packets - push unsent packets to bearer
872 *
873 * Push out the unsent messages of a link where congestion
874 * has abated. Node is locked.
875 *
876 * Called with node locked
Per Lidenb97bf3f2006-01-02 19:04:38 +0100877 */
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400878void tipc_link_push_packets(struct tipc_link *link)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100879{
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400880 struct sk_buff *skb;
Ying Xue47b4c9a2014-11-26 11:41:48 +0800881 struct tipc_msg *msg;
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -0400882 u16 seqno = link->snd_nxt;
Jon Paul Maloya97b9d32015-05-14 10:46:15 -0400883 u16 ack = mod(link->rcv_nxt - 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100884
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400885 while (skb_queue_len(&link->transmq) < link->window) {
886 skb = __skb_dequeue(&link->backlogq);
887 if (!skb)
Ying Xue47b4c9a2014-11-26 11:41:48 +0800888 break;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400889 TIPC_SKB_CB(skb)->ackers = link->ackers;
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400890 msg = buf_msg(skb);
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400891 link->backlog[msg_importance(msg)].len--;
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400892 msg_set_ack(msg, ack);
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -0400893 msg_set_seqno(msg, seqno);
894 seqno = mod(seqno + 1);
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400895 /* msg_set_bcast_ack(msg, link->owner->bclink.last_in); */
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400896 link->rcv_unacked = 0;
897 __skb_queue_tail(&link->transmq, skb);
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400898 tipc_bearer_send(link->net, link->bearer_id,
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400899 skb, link->media_addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100900 }
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -0400901 link->snd_nxt = seqno;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100902}
903
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400904void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq)
905{
906 struct sk_buff *skb, *_skb;
907 struct tipc_msg *hdr;
908 u16 seqno = l->snd_nxt;
909 u16 ack = l->rcv_nxt - 1;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400910 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400911
912 while (skb_queue_len(&l->transmq) < l->window) {
913 skb = skb_peek(&l->backlogq);
914 if (!skb)
915 break;
916 _skb = skb_clone(skb, GFP_ATOMIC);
917 if (!_skb)
918 break;
919 __skb_dequeue(&l->backlogq);
920 hdr = buf_msg(skb);
921 l->backlog[msg_importance(hdr)].len--;
922 __skb_queue_tail(&l->transmq, skb);
923 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400924 TIPC_SKB_CB(skb)->ackers = l->ackers;
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400925 msg_set_seqno(hdr, seqno);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400926 msg_set_ack(hdr, ack);
927 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400928 l->rcv_unacked = 0;
929 seqno++;
930 }
931 l->snd_nxt = seqno;
932}
933
Jon Paul Maloy52666982015-10-22 08:51:41 -0400934static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb)
Allan Stephensd356eeb2006-06-25 23:40:01 -0700935{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400936 struct tipc_msg *hdr = buf_msg(skb);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700937
Jon Paul Maloy52666982015-10-22 08:51:41 -0400938 pr_warn("Retransmission failure on link <%s>\n", l->name);
939 link_print(l, "Resetting link ");
940 pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
941 msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr));
942 pr_info("sqno %u, prev: %x, src: %x\n",
943 msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr));
Allan Stephensd356eeb2006-06-25 23:40:01 -0700944}
945
Ying Xue58dc55f2014-11-26 11:41:52 +0800946void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb,
Per Liden4323add2006-01-18 00:38:21 +0100947 u32 retransmits)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100948{
949 struct tipc_msg *msg;
950
Ying Xue58dc55f2014-11-26 11:41:52 +0800951 if (!skb)
Allan Stephensd356eeb2006-06-25 23:40:01 -0700952 return;
953
Ying Xue58dc55f2014-11-26 11:41:52 +0800954 msg = buf_msg(skb);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900955
Erik Hugne512137e2013-12-06 10:08:00 -0500956 /* Detect repeated retransmit failures */
Jon Paul Maloya97b9d32015-05-14 10:46:15 -0400957 if (l_ptr->last_retransm == msg_seqno(msg)) {
Erik Hugne512137e2013-12-06 10:08:00 -0500958 if (++l_ptr->stale_count > 100) {
Ying Xue58dc55f2014-11-26 11:41:52 +0800959 link_retransmit_failure(l_ptr, skb);
Erik Hugne512137e2013-12-06 10:08:00 -0500960 return;
Allan Stephensd356eeb2006-06-25 23:40:01 -0700961 }
962 } else {
Jon Paul Maloya97b9d32015-05-14 10:46:15 -0400963 l_ptr->last_retransm = msg_seqno(msg);
Erik Hugne512137e2013-12-06 10:08:00 -0500964 l_ptr->stale_count = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100965 }
Allan Stephensd356eeb2006-06-25 23:40:01 -0700966
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -0400967 skb_queue_walk_from(&l_ptr->transmq, skb) {
968 if (!retransmits)
Ying Xue58dc55f2014-11-26 11:41:52 +0800969 break;
970 msg = buf_msg(skb);
Jon Paul Maloya97b9d32015-05-14 10:46:15 -0400971 msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1));
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400972 /* msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); */
973 tipc_bearer_send(l_ptr->net, l_ptr->bearer_id, skb,
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400974 l_ptr->media_addr);
Ying Xue3c294cb2012-11-15 11:34:45 +0800975 retransmits--;
976 l_ptr->stats.retransmitted++;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100977 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100978}
979
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400980int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to,
981 struct sk_buff_head *xmitq)
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400982{
983 struct sk_buff *_skb, *skb = skb_peek(&l->transmq);
984 struct tipc_msg *hdr;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400985 u16 ack = l->rcv_nxt - 1;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400986 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400987
988 if (!skb)
989 return 0;
990
991 /* Detect repeated retransmit failures on same packet */
992 if (likely(l->last_retransm != buf_seqno(skb))) {
993 l->last_retransm = buf_seqno(skb);
994 l->stale_count = 1;
995 } else if (++l->stale_count > 100) {
996 link_retransmit_failure(l, skb);
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400997 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400998 }
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400999
1000 /* Move forward to where retransmission should start */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001001 skb_queue_walk(&l->transmq, skb) {
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001002 if (!less(buf_seqno(skb), from))
1003 break;
1004 }
1005
1006 skb_queue_walk_from(&l->transmq, skb) {
1007 if (more(buf_seqno(skb), to))
1008 break;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001009 hdr = buf_msg(skb);
1010 _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC);
1011 if (!_skb)
1012 return 0;
1013 hdr = buf_msg(_skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001014 msg_set_ack(hdr, ack);
1015 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001016 _skb->priority = TC_PRIO_CONTROL;
1017 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001018 l->stats.retransmitted++;
1019 }
1020 return 0;
1021}
1022
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001023/* tipc_data_input - deliver data and name distr msgs to upper layer
Erik Hugne7ae934b2014-07-01 10:22:40 +02001024 *
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001025 * Consumes buffer if message is of right type
Erik Hugne7ae934b2014-07-01 10:22:40 +02001026 * Node lock must be held
1027 */
Jon Paul Maloy52666982015-10-22 08:51:41 -04001028static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb,
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001029 struct sk_buff_head *inputq)
Erik Hugne7ae934b2014-07-01 10:22:40 +02001030{
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001031 switch (msg_user(buf_msg(skb))) {
Erik Hugne7ae934b2014-07-01 10:22:40 +02001032 case TIPC_LOW_IMPORTANCE:
1033 case TIPC_MEDIUM_IMPORTANCE:
1034 case TIPC_HIGH_IMPORTANCE:
1035 case TIPC_CRITICAL_IMPORTANCE:
1036 case CONN_MANAGER:
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001037 skb_queue_tail(inputq, skb);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001038 return true;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001039 case NAME_DISTRIBUTOR:
Jon Paul Maloy52666982015-10-22 08:51:41 -04001040 l->bc_rcvlink->state = LINK_ESTABLISHED;
1041 skb_queue_tail(l->namedq, skb);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001042 return true;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001043 case MSG_BUNDLER:
Jon Paul Maloydff29b12015-04-02 09:33:01 -04001044 case TUNNEL_PROTOCOL:
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001045 case MSG_FRAGMENTER:
1046 case BCAST_PROTOCOL:
1047 return false;
1048 default:
1049 pr_warn("Dropping received illegal msg type\n");
1050 kfree_skb(skb);
1051 return false;
1052 };
1053}
1054
1055/* tipc_link_input - process packet that has passed link protocol check
1056 *
1057 * Consumes buffer
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001058 */
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001059static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,
1060 struct sk_buff_head *inputq)
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001061{
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001062 struct tipc_msg *hdr = buf_msg(skb);
1063 struct sk_buff **reasm_skb = &l->reasm_buf;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001064 struct sk_buff *iskb;
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001065 struct sk_buff_head tmpq;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001066 int usr = msg_user(hdr);
Jon Paul Maloy6144a992015-07-30 18:24:16 -04001067 int rc = 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001068 int pos = 0;
1069 int ipos = 0;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001070
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001071 if (unlikely(usr == TUNNEL_PROTOCOL)) {
1072 if (msg_type(hdr) == SYNCH_MSG) {
1073 __skb_queue_purge(&l->deferdq);
1074 goto drop;
Jon Paul Maloy8b4ed862015-03-25 12:07:26 -04001075 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001076 if (!tipc_msg_extract(skb, &iskb, &ipos))
1077 return rc;
1078 kfree_skb(skb);
1079 skb = iskb;
1080 hdr = buf_msg(skb);
1081 if (less(msg_seqno(hdr), l->drop_point))
1082 goto drop;
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001083 if (tipc_data_input(l, skb, inputq))
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001084 return rc;
1085 usr = msg_user(hdr);
1086 reasm_skb = &l->failover_reasm_skb;
1087 }
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001088
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001089 if (usr == MSG_BUNDLER) {
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001090 skb_queue_head_init(&tmpq);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001091 l->stats.recv_bundles++;
1092 l->stats.recv_bundled += msg_msgcnt(hdr);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001093 while (tipc_msg_extract(skb, &iskb, &pos))
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001094 tipc_data_input(l, iskb, &tmpq);
1095 tipc_skb_queue_splice_tail(&tmpq, inputq);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001096 return 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001097 } else if (usr == MSG_FRAGMENTER) {
1098 l->stats.recv_fragments++;
1099 if (tipc_buf_append(reasm_skb, &skb)) {
1100 l->stats.recv_fragmented++;
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001101 tipc_data_input(l, skb, inputq);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001102 } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) {
1103 pr_warn_ratelimited("Unable to build fragment list\n");
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001104 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001105 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001106 return 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001107 } else if (usr == BCAST_PROTOCOL) {
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001108 tipc_bcast_lock(l->net);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001109 tipc_link_bc_init_rcv(l->bc_rcvlink, hdr);
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001110 tipc_bcast_unlock(l->net);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001111 }
1112drop:
1113 kfree_skb(skb);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001114 return 0;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001115}
1116
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001117static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
1118{
1119 bool released = false;
1120 struct sk_buff *skb, *tmp;
1121
1122 skb_queue_walk_safe(&l->transmq, skb, tmp) {
1123 if (more(buf_seqno(skb), acked))
1124 break;
1125 __skb_unlink(skb, &l->transmq);
1126 kfree_skb(skb);
1127 released = true;
1128 }
1129 return released;
1130}
1131
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001132/* tipc_link_build_ack_msg: prepare link acknowledge message for transmission
Jon Paul Maloy52666982015-10-22 08:51:41 -04001133 *
1134 * Note that sending of broadcast ack is coordinated among nodes, to reduce
1135 * risk of ack storms towards the sender
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001136 */
Jon Paul Maloy52666982015-10-22 08:51:41 -04001137int tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001138{
Jon Paul Maloy52666982015-10-22 08:51:41 -04001139 if (!l)
1140 return 0;
1141
1142 /* Broadcast ACK must be sent via a unicast link => defer to caller */
1143 if (link_is_bc_rcvlink(l)) {
1144 if (((l->rcv_nxt ^ link_own_addr(l)) & 0xf) != 0xf)
1145 return 0;
1146 l->rcv_unacked = 0;
1147 return TIPC_LINK_SND_BC_ACK;
1148 }
1149
1150 /* Unicast ACK */
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001151 l->rcv_unacked = 0;
1152 l->stats.sent_acks++;
1153 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001154 return 0;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001155}
1156
Jon Paul Maloy282b3a02015-10-15 14:52:45 -04001157/* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message
1158 */
1159void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
1160{
1161 int mtyp = RESET_MSG;
1162
1163 if (l->state == LINK_ESTABLISHING)
1164 mtyp = ACTIVATE_MSG;
1165
1166 tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq);
1167}
1168
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001169/* tipc_link_build_nack_msg: prepare link nack message for transmission
1170 */
1171static void tipc_link_build_nack_msg(struct tipc_link *l,
1172 struct sk_buff_head *xmitq)
1173{
1174 u32 def_cnt = ++l->stats.deferred_recv;
1175
Jon Paul Maloy52666982015-10-22 08:51:41 -04001176 if (link_is_bc_rcvlink(l))
1177 return;
1178
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001179 if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV))
1180 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
1181}
1182
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001183/* tipc_link_rcv - process TIPC packets/messages arriving from off-node
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001184 * @l: the link that should handle the message
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001185 * @skb: TIPC packet
1186 * @xmitq: queue to place packets to be sent after this call
1187 */
1188int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
1189 struct sk_buff_head *xmitq)
1190{
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001191 struct sk_buff_head *defq = &l->deferdq;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001192 struct tipc_msg *hdr;
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001193 u16 seqno, rcv_nxt, win_lim;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001194 int rc = 0;
1195
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001196 do {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001197 hdr = buf_msg(skb);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001198 seqno = msg_seqno(hdr);
1199 rcv_nxt = l->rcv_nxt;
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001200 win_lim = rcv_nxt + TIPC_MAX_LINK_WIN;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001201
1202 /* Verify and update link state */
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001203 if (unlikely(msg_user(hdr) == LINK_PROTOCOL))
1204 return tipc_link_proto_rcv(l, skb, xmitq);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001205
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001206 if (unlikely(!link_is_up(l))) {
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001207 if (l->state == LINK_ESTABLISHING)
1208 rc = TIPC_LINK_UP_EVT;
1209 goto drop;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001210 }
1211
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001212 /* Don't send probe at next timeout expiration */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001213 l->silent_intv_cnt = 0;
1214
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001215 /* Drop if outside receive window */
1216 if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) {
1217 l->stats.duplicates++;
1218 goto drop;
1219 }
1220
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001221 /* Forward queues and wake up waiting users */
1222 if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) {
1223 tipc_link_advance_backlog(l, xmitq);
1224 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1225 link_prepare_wakeup(l);
1226 }
1227
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001228 /* Defer delivery if sequence gap */
1229 if (unlikely(seqno != rcv_nxt)) {
Jon Paul Maloy8306f992015-10-15 14:52:43 -04001230 __tipc_skb_queue_sorted(defq, seqno, skb);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001231 tipc_link_build_nack_msg(l, xmitq);
1232 break;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001233 }
1234
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001235 /* Deliver packet */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001236 l->rcv_nxt++;
1237 l->stats.recv_info++;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001238 if (!tipc_data_input(l, skb, l->inputq))
Jon Paul Maloy52666982015-10-22 08:51:41 -04001239 rc |= tipc_link_input(l, skb, l->inputq);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001240 if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN))
Jon Paul Maloy52666982015-10-22 08:51:41 -04001241 rc |= tipc_link_build_ack_msg(l, xmitq);
1242 if (unlikely(rc & ~TIPC_LINK_SND_BC_ACK))
1243 break;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001244 } while ((skb = __skb_dequeue(defq)));
1245
1246 return rc;
1247drop:
1248 kfree_skb(skb);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001249 return rc;
1250}
1251
Erik Hugne7ae934b2014-07-01 10:22:40 +02001252/**
Allan Stephens8809b252011-10-25 10:44:35 -04001253 * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue
1254 *
1255 * Returns increase in queue length (i.e. 0 or 1)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001256 */
Ying Xuebc6fecd2014-11-26 11:41:53 +08001257u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001258{
Ying Xuebc6fecd2014-11-26 11:41:53 +08001259 struct sk_buff *skb1;
Jon Paul Maloye4bf4f72015-05-14 10:46:14 -04001260 u16 seq_no = buf_seqno(skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001261
1262 /* Empty queue ? */
Ying Xuebc6fecd2014-11-26 11:41:53 +08001263 if (skb_queue_empty(list)) {
1264 __skb_queue_tail(list, skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001265 return 1;
1266 }
1267
1268 /* Last ? */
Ying Xuebc6fecd2014-11-26 11:41:53 +08001269 if (less(buf_seqno(skb_peek_tail(list)), seq_no)) {
1270 __skb_queue_tail(list, skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001271 return 1;
1272 }
1273
Allan Stephens8809b252011-10-25 10:44:35 -04001274 /* Locate insertion point in queue, then insert; discard if duplicate */
Ying Xuebc6fecd2014-11-26 11:41:53 +08001275 skb_queue_walk(list, skb1) {
Jon Paul Maloye4bf4f72015-05-14 10:46:14 -04001276 u16 curr_seqno = buf_seqno(skb1);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001277
Allan Stephens8809b252011-10-25 10:44:35 -04001278 if (seq_no == curr_seqno) {
Ying Xuebc6fecd2014-11-26 11:41:53 +08001279 kfree_skb(skb);
Allan Stephens8809b252011-10-25 10:44:35 -04001280 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001281 }
Allan Stephens8809b252011-10-25 10:44:35 -04001282
1283 if (less(seq_no, curr_seqno))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001284 break;
Allan Stephens8809b252011-10-25 10:44:35 -04001285 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001286
Ying Xuebc6fecd2014-11-26 11:41:53 +08001287 __skb_queue_before(list, skb1, skb);
Allan Stephens8809b252011-10-25 10:44:35 -04001288 return 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001289}
1290
Allan Stephens8809b252011-10-25 10:44:35 -04001291/*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001292 * Send protocol message to the other endpoint.
1293 */
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001294void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg,
Jon Paul Maloyed193ec2015-04-02 09:33:02 -04001295 u32 gap, u32 tolerance, u32 priority)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001296{
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001297 struct sk_buff *skb = NULL;
1298 struct sk_buff_head xmitq;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001299
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001300 __skb_queue_head_init(&xmitq);
1301 tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap,
1302 tolerance, priority, &xmitq);
1303 skb = __skb_dequeue(&xmitq);
1304 if (!skb)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001305 return;
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001306 tipc_bearer_xmit_skb(l->net, l->bearer_id, skb, l->media_addr);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001307 l->rcv_unacked = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001308}
1309
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001310static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
1311 u16 rcvgap, int tolerance, int priority,
1312 struct sk_buff_head *xmitq)
1313{
1314 struct sk_buff *skb = NULL;
1315 struct tipc_msg *hdr = l->pmsg;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001316 bool node_up = link_is_up(l->bc_rcvlink);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001317
1318 /* Don't send protocol message during reset or link failover */
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001319 if (tipc_link_is_blocked(l))
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001320 return;
1321
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001322 msg_set_type(hdr, mtyp);
1323 msg_set_net_plane(hdr, l->net_plane);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001324 msg_set_next_sent(hdr, l->snd_nxt);
1325 msg_set_ack(hdr, l->rcv_nxt - 1);
1326 msg_set_bcast_ack(hdr, l->bc_rcvlink->rcv_nxt - 1);
1327 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001328 msg_set_link_tolerance(hdr, tolerance);
1329 msg_set_linkprio(hdr, priority);
1330 msg_set_redundant_link(hdr, node_up);
1331 msg_set_seq_gap(hdr, 0);
1332
1333 /* Compatibility: created msg must not be in sequence with pkt flow */
Jon Paul Maloy52666982015-10-22 08:51:41 -04001334 msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001335
1336 if (mtyp == STATE_MSG) {
1337 if (!tipc_link_is_up(l))
1338 return;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001339
1340 /* Override rcvgap if there are packets in deferred queue */
1341 if (!skb_queue_empty(&l->deferdq))
Jon Paul Maloy52666982015-10-22 08:51:41 -04001342 rcvgap = buf_seqno(skb_peek(&l->deferdq)) - l->rcv_nxt;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001343 if (rcvgap) {
1344 msg_set_seq_gap(hdr, rcvgap);
1345 l->stats.sent_nacks++;
1346 }
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001347 msg_set_probe(hdr, probe);
1348 if (probe)
1349 l->stats.sent_probes++;
1350 l->stats.sent_states++;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001351 l->rcv_unacked = 0;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001352 } else {
1353 /* RESET_MSG or ACTIVATE_MSG */
1354 msg_set_max_pkt(hdr, l->advertised_mtu);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001355 msg_set_ack(hdr, l->rcv_nxt - 1);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001356 msg_set_next_sent(hdr, 1);
1357 }
1358 skb = tipc_buf_acquire(msg_size(hdr));
1359 if (!skb)
1360 return;
1361 skb_copy_to_linear_data(skb, hdr, msg_size(hdr));
1362 skb->priority = TC_PRIO_CONTROL;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001363 __skb_queue_tail(xmitq, skb);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001364}
Per Lidenb97bf3f2006-01-02 19:04:38 +01001365
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001366/* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001367 * with contents of the link's transmit and backlog queues.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001368 */
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001369void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
1370 int mtyp, struct sk_buff_head *xmitq)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001371{
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001372 struct sk_buff *skb, *tnlskb;
1373 struct tipc_msg *hdr, tnlhdr;
1374 struct sk_buff_head *queue = &l->transmq;
1375 struct sk_buff_head tmpxq, tnlq;
1376 u16 pktlen, pktcnt, seqno = l->snd_nxt;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001377
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001378 if (!tnl)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001379 return;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001380
1381 skb_queue_head_init(&tnlq);
1382 skb_queue_head_init(&tmpxq);
1383
1384 /* At least one packet required for safe algorithm => add dummy */
1385 skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
1386 BASIC_H_SIZE, 0, l->addr, link_own_addr(l),
1387 0, 0, TIPC_ERR_NO_PORT);
Ying Xuea6ca1092014-11-26 11:41:55 +08001388 if (!skb) {
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001389 pr_warn("%sunable to create tunnel packet\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001390 return;
Allan Stephens5392d642006-06-25 23:52:50 -07001391 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001392 skb_queue_tail(&tnlq, skb);
1393 tipc_link_xmit(l, &tnlq, &tmpxq);
1394 __skb_queue_purge(&tmpxq);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001395
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001396 /* Initialize reusable tunnel packet header */
1397 tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL,
1398 mtyp, INT_H_SIZE, l->addr);
1399 pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq);
1400 msg_set_msgcnt(&tnlhdr, pktcnt);
1401 msg_set_bearer_id(&tnlhdr, l->peer_bearer_id);
1402tnl:
1403 /* Wrap each packet into a tunnel packet */
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -04001404 skb_queue_walk(queue, skb) {
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001405 hdr = buf_msg(skb);
1406 if (queue == &l->backlogq)
1407 msg_set_seqno(hdr, seqno++);
1408 pktlen = msg_size(hdr);
1409 msg_set_size(&tnlhdr, pktlen + INT_H_SIZE);
1410 tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE);
1411 if (!tnlskb) {
1412 pr_warn("%sunable to send packet\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001413 return;
1414 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001415 skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE);
1416 skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen);
1417 __skb_queue_tail(&tnlq, tnlskb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001418 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001419 if (queue != &l->backlogq) {
1420 queue = &l->backlogq;
1421 goto tnl;
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -04001422 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001423
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001424 tipc_link_xmit(tnl, &tnlq, xmitq);
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001425
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001426 if (mtyp == FAILOVER_MSG) {
1427 tnl->drop_point = l->rcv_nxt;
1428 tnl->failover_reasm_skb = l->reasm_buf;
1429 l->reasm_buf = NULL;
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001430 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001431}
1432
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001433/* tipc_link_proto_rcv(): receive link level protocol message :
1434 * Note that network plane id propagates through the network, and may
1435 * change at any time. The node with lowest numerical id determines
1436 * network plane
1437 */
1438static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
1439 struct sk_buff_head *xmitq)
1440{
1441 struct tipc_msg *hdr = buf_msg(skb);
1442 u16 rcvgap = 0;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001443 u16 ack = msg_ack(hdr);
1444 u16 gap = msg_seq_gap(hdr);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001445 u16 peers_snd_nxt = msg_next_sent(hdr);
1446 u16 peers_tol = msg_link_tolerance(hdr);
1447 u16 peers_prio = msg_linkprio(hdr);
Jon Paul Maloy2be80c22015-08-20 02:12:56 -04001448 u16 rcv_nxt = l->rcv_nxt;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001449 int mtyp = msg_type(hdr);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001450 char *if_name;
1451 int rc = 0;
1452
Jon Paul Maloy52666982015-10-22 08:51:41 -04001453 if (tipc_link_is_blocked(l) || !xmitq)
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001454 goto exit;
1455
1456 if (link_own_addr(l) > msg_prevnode(hdr))
1457 l->net_plane = msg_net_plane(hdr);
1458
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001459 switch (mtyp) {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001460 case RESET_MSG:
1461
1462 /* Ignore duplicate RESET with old session number */
1463 if ((less_eq(msg_session(hdr), l->peer_session)) &&
1464 (l->peer_session != WILDCARD_SESSION))
1465 break;
1466 /* fall thru' */
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001467
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001468 case ACTIVATE_MSG:
1469
1470 /* Complete own link name with peer's interface name */
1471 if_name = strrchr(l->name, ':') + 1;
1472 if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME)
1473 break;
1474 if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
1475 break;
1476 strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME);
1477
1478 /* 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 /* Update own priority if peer's priority is higher */
1483 if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
1484 l->priority = peers_prio;
1485
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001486 /* ACTIVATE_MSG serves as PEER_RESET if link is already down */
1487 if ((mtyp == RESET_MSG) || !link_is_up(l))
1488 rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
1489
1490 /* ACTIVATE_MSG takes up link if it was already locally reset */
1491 if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING))
1492 rc = TIPC_LINK_UP_EVT;
1493
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001494 l->peer_session = msg_session(hdr);
1495 l->peer_bearer_id = msg_bearer_id(hdr);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001496 if (l->mtu > msg_max_pkt(hdr))
1497 l->mtu = msg_max_pkt(hdr);
1498 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001499
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001500 case STATE_MSG:
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001501
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001502 /* Update own tolerance if peer indicates a non-zero value */
1503 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
1504 l->tolerance = peers_tol;
1505
1506 l->silent_intv_cnt = 0;
1507 l->stats.recv_states++;
1508 if (msg_probe(hdr))
1509 l->stats.recv_probes++;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001510
1511 if (!link_is_up(l)) {
1512 if (l->state == LINK_ESTABLISHING)
1513 rc = TIPC_LINK_UP_EVT;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001514 break;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001515 }
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001516
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001517 /* Send NACK if peer has sent pkts we haven't received yet */
Jon Paul Maloy2be80c22015-08-20 02:12:56 -04001518 if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l))
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001519 rcvgap = peers_snd_nxt - l->rcv_nxt;
1520 if (rcvgap || (msg_probe(hdr)))
1521 tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap,
Jon Paul Maloy16040892015-07-21 06:42:28 -04001522 0, 0, xmitq);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001523 tipc_link_release_pkts(l, ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001524
1525 /* If NACK, retransmit will now start at right position */
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001526 if (gap) {
1527 rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001528 l->stats.recv_nacks++;
1529 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001530
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001531 tipc_link_advance_backlog(l, xmitq);
1532 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1533 link_prepare_wakeup(l);
1534 }
1535exit:
1536 kfree_skb(skb);
1537 return rc;
1538}
1539
Jon Paul Maloy52666982015-10-22 08:51:41 -04001540/* tipc_link_build_bc_proto_msg() - create broadcast protocol message
1541 */
1542static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast,
1543 u16 peers_snd_nxt,
1544 struct sk_buff_head *xmitq)
1545{
1546 struct sk_buff *skb;
1547 struct tipc_msg *hdr;
1548 struct sk_buff *dfrd_skb = skb_peek(&l->deferdq);
1549 u16 ack = l->rcv_nxt - 1;
1550 u16 gap_to = peers_snd_nxt - 1;
1551
1552 skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
1553 0, l->addr, link_own_addr(l), 0, 0, 0);
1554 if (!skb)
1555 return false;
1556 hdr = buf_msg(skb);
1557 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
1558 msg_set_bcast_ack(hdr, ack);
1559 msg_set_bcgap_after(hdr, ack);
1560 if (dfrd_skb)
1561 gap_to = buf_seqno(dfrd_skb) - 1;
1562 msg_set_bcgap_to(hdr, gap_to);
1563 msg_set_non_seq(hdr, bcast);
1564 __skb_queue_tail(xmitq, skb);
1565 return true;
1566}
1567
1568/* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints.
1569 *
1570 * Give a newly added peer node the sequence number where it should
1571 * start receiving and acking broadcast packets.
1572 */
1573void tipc_link_build_bc_init_msg(struct tipc_link *l,
1574 struct sk_buff_head *xmitq)
1575{
1576 struct sk_buff_head list;
1577
1578 __skb_queue_head_init(&list);
1579 if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list))
1580 return;
1581 tipc_link_xmit(l, &list, xmitq);
1582}
1583
1584/* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer
1585 */
1586void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr)
1587{
1588 int mtyp = msg_type(hdr);
1589 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
1590
1591 if (link_is_up(l))
1592 return;
1593
1594 if (msg_user(hdr) == BCAST_PROTOCOL) {
1595 l->rcv_nxt = peers_snd_nxt;
1596 l->state = LINK_ESTABLISHED;
1597 return;
1598 }
1599
1600 if (l->peer_caps & TIPC_BCAST_SYNCH)
1601 return;
1602
1603 if (msg_peer_node_is_up(hdr))
1604 return;
1605
1606 /* Compatibility: accept older, less safe initial synch data */
1607 if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG))
1608 l->rcv_nxt = peers_snd_nxt;
1609}
1610
1611/* tipc_link_bc_sync_rcv - update rcv link according to peer's send state
1612 */
1613void tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
1614 struct sk_buff_head *xmitq)
1615{
1616 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
1617
1618 if (!link_is_up(l))
1619 return;
1620
1621 if (!msg_peer_node_is_up(hdr))
1622 return;
1623
1624 l->bc_peer_is_up = true;
1625
1626 /* Ignore if peers_snd_nxt goes beyond receive window */
1627 if (more(peers_snd_nxt, l->rcv_nxt + l->window))
1628 return;
1629
1630 if (!more(peers_snd_nxt, l->rcv_nxt)) {
1631 l->nack_state = BC_NACK_SND_CONDITIONAL;
1632 return;
1633 }
1634
1635 /* Don't NACK if one was recently sent or peeked */
1636 if (l->nack_state == BC_NACK_SND_SUPPRESS) {
1637 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
1638 return;
1639 }
1640
1641 /* Conditionally delay NACK sending until next synch rcv */
1642 if (l->nack_state == BC_NACK_SND_CONDITIONAL) {
1643 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
1644 if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN)
1645 return;
1646 }
1647
1648 /* Send NACK now but suppress next one */
1649 tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq);
1650 l->nack_state = BC_NACK_SND_SUPPRESS;
1651}
1652
1653void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked,
1654 struct sk_buff_head *xmitq)
1655{
1656 struct sk_buff *skb, *tmp;
1657 struct tipc_link *snd_l = l->bc_sndlink;
1658
1659 if (!link_is_up(l) || !l->bc_peer_is_up)
1660 return;
1661
1662 if (!more(acked, l->acked))
1663 return;
1664
1665 /* Skip over packets peer has already acked */
1666 skb_queue_walk(&snd_l->transmq, skb) {
1667 if (more(buf_seqno(skb), l->acked))
1668 break;
1669 }
1670
1671 /* Update/release the packets peer is acking now */
1672 skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) {
1673 if (more(buf_seqno(skb), acked))
1674 break;
1675 if (!--TIPC_SKB_CB(skb)->ackers) {
1676 __skb_unlink(skb, &snd_l->transmq);
1677 kfree_skb(skb);
1678 }
1679 }
1680 l->acked = acked;
1681 tipc_link_advance_backlog(snd_l, xmitq);
1682 if (unlikely(!skb_queue_empty(&snd_l->wakeupq)))
1683 link_prepare_wakeup(snd_l);
1684}
1685
1686/* tipc_link_bc_nack_rcv(): receive broadcast nack message
1687 */
1688int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
1689 struct sk_buff_head *xmitq)
1690{
1691 struct tipc_msg *hdr = buf_msg(skb);
1692 u32 dnode = msg_destnode(hdr);
1693 int mtyp = msg_type(hdr);
1694 u16 acked = msg_bcast_ack(hdr);
1695 u16 from = acked + 1;
1696 u16 to = msg_bcgap_to(hdr);
1697 u16 peers_snd_nxt = to + 1;
1698 int rc = 0;
1699
1700 kfree_skb(skb);
1701
1702 if (!tipc_link_is_up(l) || !l->bc_peer_is_up)
1703 return 0;
1704
1705 if (mtyp != STATE_MSG)
1706 return 0;
1707
1708 if (dnode == link_own_addr(l)) {
1709 tipc_link_bc_ack_rcv(l, acked, xmitq);
1710 rc = tipc_link_retrans(l->bc_sndlink, from, to, xmitq);
1711 l->stats.recv_nacks++;
1712 return rc;
1713 }
1714
1715 /* Msg for other node => suppress own NACK at next sync if applicable */
1716 if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from))
1717 l->nack_state = BC_NACK_SND_SUPPRESS;
1718
1719 return 0;
1720}
1721
Jon Paul Maloye3eea1e2015-03-13 16:08:11 -04001722void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001723{
Jon Paul Maloyed193ec2015-04-02 09:33:02 -04001724 int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE);
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -04001725
Jon Paul Maloye3eea1e2015-03-13 16:08:11 -04001726 l->window = win;
Jon Paul Maloy1f66d162015-03-25 12:07:24 -04001727 l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2;
1728 l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win;
1729 l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3;
1730 l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2;
1731 l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001732}
1733
Jon Paul Maloye099e862014-02-13 17:29:18 -05001734/* tipc_link_find_owner - locate owner node of link by link's name
Ying Xuef2f98002015-01-09 15:27:05 +08001735 * @net: the applicable net namespace
Jon Paul Maloye099e862014-02-13 17:29:18 -05001736 * @name: pointer to link name string
1737 * @bearer_id: pointer to index in 'node->links' array where the link was found.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001738 *
Jon Paul Maloye099e862014-02-13 17:29:18 -05001739 * Returns pointer to node owning the link, or 0 if no matching link is found.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001740 */
Ying Xuef2f98002015-01-09 15:27:05 +08001741static struct tipc_node *tipc_link_find_owner(struct net *net,
1742 const char *link_name,
Jon Paul Maloye099e862014-02-13 17:29:18 -05001743 unsigned int *bearer_id)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001744{
Ying Xuef2f98002015-01-09 15:27:05 +08001745 struct tipc_net *tn = net_generic(net, tipc_net_id);
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001746 struct tipc_link *l_ptr;
Erik Hugnebbfbe472013-10-18 07:23:21 +02001747 struct tipc_node *n_ptr;
Fabian Frederick886eaa12014-12-25 12:05:50 +01001748 struct tipc_node *found_node = NULL;
Erik Hugnebbfbe472013-10-18 07:23:21 +02001749 int i;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001750
Jon Paul Maloye099e862014-02-13 17:29:18 -05001751 *bearer_id = 0;
Ying Xue6c7a7622014-03-27 12:54:37 +08001752 rcu_read_lock();
Ying Xuef2f98002015-01-09 15:27:05 +08001753 list_for_each_entry_rcu(n_ptr, &tn->node_list, list) {
Jon Paul Maloya11607f2014-02-14 16:40:44 -05001754 tipc_node_lock(n_ptr);
Erik Hugnebbfbe472013-10-18 07:23:21 +02001755 for (i = 0; i < MAX_BEARERS; i++) {
Jon Paul Maloy9d13ec62015-07-16 16:54:19 -04001756 l_ptr = n_ptr->links[i].link;
Jon Paul Maloye099e862014-02-13 17:29:18 -05001757 if (l_ptr && !strcmp(l_ptr->name, link_name)) {
1758 *bearer_id = i;
1759 found_node = n_ptr;
1760 break;
1761 }
Erik Hugnebbfbe472013-10-18 07:23:21 +02001762 }
Jon Paul Maloya11607f2014-02-14 16:40:44 -05001763 tipc_node_unlock(n_ptr);
Jon Paul Maloye099e862014-02-13 17:29:18 -05001764 if (found_node)
1765 break;
Erik Hugnebbfbe472013-10-18 07:23:21 +02001766 }
Ying Xue6c7a7622014-03-27 12:54:37 +08001767 rcu_read_unlock();
1768
Jon Paul Maloye099e862014-02-13 17:29:18 -05001769 return found_node;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001770}
1771
Allan Stephens5c216e12011-10-18 11:34:29 -04001772/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001773 * link_reset_statistics - reset link statistics
1774 * @l_ptr: pointer to link
1775 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001776static void link_reset_statistics(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001777{
1778 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
Jon Paul Maloya97b9d32015-05-14 10:46:15 -04001779 l_ptr->stats.sent_info = l_ptr->snd_nxt;
1780 l_ptr->stats.recv_info = l_ptr->rcv_nxt;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001781}
1782
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001783static void link_print(struct tipc_link *l, const char *str)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001784{
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001785 struct sk_buff *hskb = skb_peek(&l->transmq);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001786 u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1;
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001787 u16 tail = l->snd_nxt - 1;
Ying Xue7a2f7d12014-04-21 10:55:46 +08001788
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001789 pr_info("%s Link <%s> state %x\n", str, l->name, l->state);
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04001790 pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n",
1791 skb_queue_len(&l->transmq), head, tail,
1792 skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001793}
Richard Alpe0655f6a2014-11-20 10:29:07 +01001794
1795/* Parse and validate nested (link) properties valid for media, bearer and link
1796 */
1797int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
1798{
1799 int err;
1800
1801 err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop,
1802 tipc_nl_prop_policy);
1803 if (err)
1804 return err;
1805
1806 if (props[TIPC_NLA_PROP_PRIO]) {
1807 u32 prio;
1808
1809 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1810 if (prio > TIPC_MAX_LINK_PRI)
1811 return -EINVAL;
1812 }
1813
1814 if (props[TIPC_NLA_PROP_TOL]) {
1815 u32 tol;
1816
1817 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1818 if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
1819 return -EINVAL;
1820 }
1821
1822 if (props[TIPC_NLA_PROP_WIN]) {
1823 u32 win;
1824
1825 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1826 if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN))
1827 return -EINVAL;
1828 }
1829
1830 return 0;
1831}
Richard Alpe7be57fc2014-11-20 10:29:12 +01001832
Richard Alpef96ce7a2014-11-20 10:29:13 +01001833int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info)
1834{
1835 int err;
1836 int res = 0;
1837 int bearer_id;
1838 char *name;
1839 struct tipc_link *link;
1840 struct tipc_node *node;
1841 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
Richard Alpe37e2d482015-02-09 09:50:08 +01001842 struct net *net = sock_net(skb->sk);
Richard Alpef96ce7a2014-11-20 10:29:13 +01001843
1844 if (!info->attrs[TIPC_NLA_LINK])
1845 return -EINVAL;
1846
1847 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
1848 info->attrs[TIPC_NLA_LINK],
1849 tipc_nl_link_policy);
1850 if (err)
1851 return err;
1852
1853 if (!attrs[TIPC_NLA_LINK_NAME])
1854 return -EINVAL;
1855
1856 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
1857
Richard Alpe670f4f82015-05-06 13:58:55 +02001858 if (strcmp(name, tipc_bclink_name) == 0)
1859 return tipc_nl_bc_link_set(net, attrs);
1860
Ying Xuef2f98002015-01-09 15:27:05 +08001861 node = tipc_link_find_owner(net, name, &bearer_id);
Richard Alpef96ce7a2014-11-20 10:29:13 +01001862 if (!node)
1863 return -EINVAL;
1864
1865 tipc_node_lock(node);
1866
Jon Paul Maloy9d13ec62015-07-16 16:54:19 -04001867 link = node->links[bearer_id].link;
Richard Alpef96ce7a2014-11-20 10:29:13 +01001868 if (!link) {
1869 res = -EINVAL;
1870 goto out;
1871 }
1872
1873 if (attrs[TIPC_NLA_LINK_PROP]) {
1874 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1875
1876 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
1877 props);
1878 if (err) {
1879 res = err;
1880 goto out;
1881 }
1882
1883 if (props[TIPC_NLA_PROP_TOL]) {
1884 u32 tol;
1885
1886 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
Jon Paul Maloy8a1577c2015-07-16 16:54:29 -04001887 link->tolerance = tol;
Jon Paul Maloyed193ec2015-04-02 09:33:02 -04001888 tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0);
Richard Alpef96ce7a2014-11-20 10:29:13 +01001889 }
1890 if (props[TIPC_NLA_PROP_PRIO]) {
1891 u32 prio;
1892
1893 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1894 link->priority = prio;
Jon Paul Maloyed193ec2015-04-02 09:33:02 -04001895 tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio);
Richard Alpef96ce7a2014-11-20 10:29:13 +01001896 }
1897 if (props[TIPC_NLA_PROP_WIN]) {
1898 u32 win;
1899
1900 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1901 tipc_link_set_queue_limits(link, win);
1902 }
1903 }
1904
1905out:
1906 tipc_node_unlock(node);
1907
1908 return res;
1909}
Richard Alped8182802014-11-24 11:10:29 +01001910
1911static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
Richard Alpe7be57fc2014-11-20 10:29:12 +01001912{
1913 int i;
1914 struct nlattr *stats;
1915
1916 struct nla_map {
1917 u32 key;
1918 u32 val;
1919 };
1920
1921 struct nla_map map[] = {
1922 {TIPC_NLA_STATS_RX_INFO, s->recv_info},
1923 {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments},
1924 {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented},
1925 {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles},
1926 {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled},
1927 {TIPC_NLA_STATS_TX_INFO, s->sent_info},
1928 {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments},
1929 {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented},
1930 {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles},
1931 {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled},
1932 {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ?
1933 s->msg_length_counts : 1},
1934 {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts},
1935 {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total},
1936 {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]},
1937 {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]},
1938 {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]},
1939 {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]},
1940 {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]},
1941 {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]},
1942 {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]},
1943 {TIPC_NLA_STATS_RX_STATES, s->recv_states},
1944 {TIPC_NLA_STATS_RX_PROBES, s->recv_probes},
1945 {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks},
1946 {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv},
1947 {TIPC_NLA_STATS_TX_STATES, s->sent_states},
1948 {TIPC_NLA_STATS_TX_PROBES, s->sent_probes},
1949 {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks},
1950 {TIPC_NLA_STATS_TX_ACKS, s->sent_acks},
1951 {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted},
1952 {TIPC_NLA_STATS_DUPLICATES, s->duplicates},
1953 {TIPC_NLA_STATS_LINK_CONGS, s->link_congs},
1954 {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz},
1955 {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ?
1956 (s->accu_queue_sz / s->queue_sz_counts) : 0}
1957 };
1958
1959 stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
1960 if (!stats)
1961 return -EMSGSIZE;
1962
1963 for (i = 0; i < ARRAY_SIZE(map); i++)
1964 if (nla_put_u32(skb, map[i].key, map[i].val))
1965 goto msg_full;
1966
1967 nla_nest_end(skb, stats);
1968
1969 return 0;
1970msg_full:
1971 nla_nest_cancel(skb, stats);
1972
1973 return -EMSGSIZE;
1974}
1975
1976/* Caller should hold appropriate locks to protect the link */
Ying Xue34747532015-01-09 15:27:10 +08001977static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
Nicolas Dichtelf2f67392015-04-28 18:33:50 +02001978 struct tipc_link *link, int nlflags)
Richard Alpe7be57fc2014-11-20 10:29:12 +01001979{
1980 int err;
1981 void *hdr;
1982 struct nlattr *attrs;
1983 struct nlattr *prop;
Ying Xue34747532015-01-09 15:27:10 +08001984 struct tipc_net *tn = net_generic(net, tipc_net_id);
Richard Alpe7be57fc2014-11-20 10:29:12 +01001985
Richard Alpebfb3e5d2015-02-09 09:50:03 +01001986 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
Nicolas Dichtelf2f67392015-04-28 18:33:50 +02001987 nlflags, TIPC_NL_LINK_GET);
Richard Alpe7be57fc2014-11-20 10:29:12 +01001988 if (!hdr)
1989 return -EMSGSIZE;
1990
1991 attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
1992 if (!attrs)
1993 goto msg_full;
1994
1995 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name))
1996 goto attr_msg_full;
1997 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST,
Ying Xue34747532015-01-09 15:27:10 +08001998 tipc_cluster_mask(tn->own_addr)))
Richard Alpe7be57fc2014-11-20 10:29:12 +01001999 goto attr_msg_full;
Jon Paul Maloyed193ec2015-04-02 09:33:02 -04002000 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu))
Richard Alpe7be57fc2014-11-20 10:29:12 +01002001 goto attr_msg_full;
Jon Paul Maloya97b9d32015-05-14 10:46:15 -04002002 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt))
Richard Alpe7be57fc2014-11-20 10:29:12 +01002003 goto attr_msg_full;
Jon Paul Maloya97b9d32015-05-14 10:46:15 -04002004 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt))
Richard Alpe7be57fc2014-11-20 10:29:12 +01002005 goto attr_msg_full;
2006
2007 if (tipc_link_is_up(link))
2008 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
2009 goto attr_msg_full;
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04002010 if (link->active)
Richard Alpe7be57fc2014-11-20 10:29:12 +01002011 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE))
2012 goto attr_msg_full;
2013
2014 prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
2015 if (!prop)
2016 goto attr_msg_full;
2017 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
2018 goto prop_msg_full;
2019 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance))
2020 goto prop_msg_full;
2021 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN,
Jon Paul Maloy1f66d162015-03-25 12:07:24 -04002022 link->window))
Richard Alpe7be57fc2014-11-20 10:29:12 +01002023 goto prop_msg_full;
2024 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
2025 goto prop_msg_full;
2026 nla_nest_end(msg->skb, prop);
2027
2028 err = __tipc_nl_add_stats(msg->skb, &link->stats);
2029 if (err)
2030 goto attr_msg_full;
2031
2032 nla_nest_end(msg->skb, attrs);
2033 genlmsg_end(msg->skb, hdr);
2034
2035 return 0;
2036
2037prop_msg_full:
2038 nla_nest_cancel(msg->skb, prop);
2039attr_msg_full:
2040 nla_nest_cancel(msg->skb, attrs);
2041msg_full:
2042 genlmsg_cancel(msg->skb, hdr);
2043
2044 return -EMSGSIZE;
2045}
2046
2047/* Caller should hold node lock */
Ying Xue34747532015-01-09 15:27:10 +08002048static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
2049 struct tipc_node *node, u32 *prev_link)
Richard Alpe7be57fc2014-11-20 10:29:12 +01002050{
2051 u32 i;
2052 int err;
2053
2054 for (i = *prev_link; i < MAX_BEARERS; i++) {
2055 *prev_link = i;
2056
Jon Paul Maloy9d13ec62015-07-16 16:54:19 -04002057 if (!node->links[i].link)
Richard Alpe7be57fc2014-11-20 10:29:12 +01002058 continue;
2059
Jon Paul Maloy9d13ec62015-07-16 16:54:19 -04002060 err = __tipc_nl_add_link(net, msg,
2061 node->links[i].link, NLM_F_MULTI);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002062 if (err)
2063 return err;
2064 }
2065 *prev_link = 0;
2066
2067 return 0;
2068}
2069
2070int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb)
2071{
Ying Xuef2f98002015-01-09 15:27:05 +08002072 struct net *net = sock_net(skb->sk);
2073 struct tipc_net *tn = net_generic(net, tipc_net_id);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002074 struct tipc_node *node;
2075 struct tipc_nl_msg msg;
2076 u32 prev_node = cb->args[0];
2077 u32 prev_link = cb->args[1];
2078 int done = cb->args[2];
2079 int err;
2080
2081 if (done)
2082 return 0;
2083
2084 msg.skb = skb;
2085 msg.portid = NETLINK_CB(cb->skb).portid;
2086 msg.seq = cb->nlh->nlmsg_seq;
2087
2088 rcu_read_lock();
Richard Alpe7be57fc2014-11-20 10:29:12 +01002089 if (prev_node) {
Ying Xuef2f98002015-01-09 15:27:05 +08002090 node = tipc_node_find(net, prev_node);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002091 if (!node) {
2092 /* We never set seq or call nl_dump_check_consistent()
2093 * this means that setting prev_seq here will cause the
2094 * consistence check to fail in the netlink callback
2095 * handler. Resulting in the last NLMSG_DONE message
2096 * having the NLM_F_DUMP_INTR flag set.
2097 */
2098 cb->prev_seq = 1;
2099 goto out;
2100 }
Ying Xue8a0f6eb2015-03-26 18:10:24 +08002101 tipc_node_put(node);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002102
Ying Xuef2f98002015-01-09 15:27:05 +08002103 list_for_each_entry_continue_rcu(node, &tn->node_list,
2104 list) {
Richard Alpe7be57fc2014-11-20 10:29:12 +01002105 tipc_node_lock(node);
Ying Xue34747532015-01-09 15:27:10 +08002106 err = __tipc_nl_add_node_links(net, &msg, node,
2107 &prev_link);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002108 tipc_node_unlock(node);
2109 if (err)
2110 goto out;
2111
2112 prev_node = node->addr;
2113 }
2114 } else {
Ying Xue1da46562015-01-09 15:27:07 +08002115 err = tipc_nl_add_bc_link(net, &msg);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002116 if (err)
2117 goto out;
2118
Ying Xuef2f98002015-01-09 15:27:05 +08002119 list_for_each_entry_rcu(node, &tn->node_list, list) {
Richard Alpe7be57fc2014-11-20 10:29:12 +01002120 tipc_node_lock(node);
Ying Xue34747532015-01-09 15:27:10 +08002121 err = __tipc_nl_add_node_links(net, &msg, node,
2122 &prev_link);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002123 tipc_node_unlock(node);
2124 if (err)
2125 goto out;
2126
2127 prev_node = node->addr;
2128 }
2129 }
2130 done = 1;
2131out:
2132 rcu_read_unlock();
2133
2134 cb->args[0] = prev_node;
2135 cb->args[1] = prev_link;
2136 cb->args[2] = done;
2137
2138 return skb->len;
2139}
2140
2141int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info)
2142{
Ying Xuef2f98002015-01-09 15:27:05 +08002143 struct net *net = genl_info_net(info);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002144 struct tipc_nl_msg msg;
Richard Alpe7be57fc2014-11-20 10:29:12 +01002145 char *name;
Richard Alpe7be57fc2014-11-20 10:29:12 +01002146 int err;
2147
Richard Alpe7be57fc2014-11-20 10:29:12 +01002148 msg.portid = info->snd_portid;
2149 msg.seq = info->snd_seq;
2150
Richard Alpe670f4f82015-05-06 13:58:55 +02002151 if (!info->attrs[TIPC_NLA_LINK_NAME])
2152 return -EINVAL;
2153 name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]);
2154
2155 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2156 if (!msg.skb)
2157 return -ENOMEM;
2158
2159 if (strcmp(name, tipc_bclink_name) == 0) {
2160 err = tipc_nl_add_bc_link(net, &msg);
2161 if (err) {
2162 nlmsg_free(msg.skb);
2163 return err;
2164 }
2165 } else {
2166 int bearer_id;
2167 struct tipc_node *node;
2168 struct tipc_link *link;
2169
2170 node = tipc_link_find_owner(net, name, &bearer_id);
2171 if (!node)
2172 return -EINVAL;
2173
2174 tipc_node_lock(node);
Jon Paul Maloy9d13ec62015-07-16 16:54:19 -04002175 link = node->links[bearer_id].link;
Richard Alpe670f4f82015-05-06 13:58:55 +02002176 if (!link) {
2177 tipc_node_unlock(node);
2178 nlmsg_free(msg.skb);
2179 return -EINVAL;
2180 }
2181
2182 err = __tipc_nl_add_link(net, &msg, link, 0);
2183 tipc_node_unlock(node);
2184 if (err) {
2185 nlmsg_free(msg.skb);
2186 return err;
2187 }
Richard Alpe7be57fc2014-11-20 10:29:12 +01002188 }
2189
Richard Alpe670f4f82015-05-06 13:58:55 +02002190 return genlmsg_reply(msg.skb, info);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002191}
Richard Alpeae363422014-11-20 10:29:14 +01002192
2193int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info)
2194{
2195 int err;
2196 char *link_name;
2197 unsigned int bearer_id;
2198 struct tipc_link *link;
2199 struct tipc_node *node;
2200 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
Richard Alpe18178772015-02-09 09:50:09 +01002201 struct net *net = sock_net(skb->sk);
Richard Alpeae363422014-11-20 10:29:14 +01002202
2203 if (!info->attrs[TIPC_NLA_LINK])
2204 return -EINVAL;
2205
2206 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
2207 info->attrs[TIPC_NLA_LINK],
2208 tipc_nl_link_policy);
2209 if (err)
2210 return err;
2211
2212 if (!attrs[TIPC_NLA_LINK_NAME])
2213 return -EINVAL;
2214
2215 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2216
2217 if (strcmp(link_name, tipc_bclink_name) == 0) {
Ying Xue1da46562015-01-09 15:27:07 +08002218 err = tipc_bclink_reset_stats(net);
Richard Alpeae363422014-11-20 10:29:14 +01002219 if (err)
2220 return err;
2221 return 0;
2222 }
2223
Ying Xuef2f98002015-01-09 15:27:05 +08002224 node = tipc_link_find_owner(net, link_name, &bearer_id);
Richard Alpeae363422014-11-20 10:29:14 +01002225 if (!node)
2226 return -EINVAL;
2227
2228 tipc_node_lock(node);
2229
Jon Paul Maloy9d13ec62015-07-16 16:54:19 -04002230 link = node->links[bearer_id].link;
Richard Alpeae363422014-11-20 10:29:14 +01002231 if (!link) {
2232 tipc_node_unlock(node);
2233 return -EINVAL;
2234 }
2235
2236 link_reset_statistics(link);
2237
2238 tipc_node_unlock(node);
2239
2240 return 0;
2241}