blob: 1db162aa64a5d0540cfc3538daa83056769776fc [file] [log] [blame]
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 Maloy170b3922014-01-07 17:02:41 -05004 * Copyright (c) 1996-2007, 2012-2014, 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"
Per Lidenb97bf3f2006-01-02 19:04:38 +010038#include "link.h"
Jon Paul Maloy9816f062014-05-14 05:39:15 -040039#include "socket.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010040#include "name_distr.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010041#include "discover.h"
42#include "config.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010043
Ying Xue796c75d2013-06-17 10:54:48 -040044#include <linux/pkt_sched.h>
45
Erik Hugne2cf8aa12012-06-29 00:16:37 -040046/*
47 * Error message prefixes
48 */
49static const char *link_co_err = "Link changeover error, ";
50static const char *link_rst_msg = "Resetting link ";
51static const char *link_unk_evt = "Unknown link event ";
Per Lidenb97bf3f2006-01-02 19:04:38 +010052
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090053/*
Allan Stephensa686e682008-06-04 17:29:39 -070054 * Out-of-range value for link session numbers
55 */
Allan Stephensa686e682008-06-04 17:29:39 -070056#define INVALID_SESSION 0x10000
57
58/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090059 * Link state events:
Per Lidenb97bf3f2006-01-02 19:04:38 +010060 */
Per Lidenb97bf3f2006-01-02 19:04:38 +010061#define STARTING_EVT 856384768 /* link processing trigger */
62#define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
63#define TIMEOUT_EVT 560817u /* link timer expired */
64
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090065/*
66 * The following two 'message types' is really just implementation
67 * data conveniently stored in the message header.
Per Lidenb97bf3f2006-01-02 19:04:38 +010068 * They must not be considered part of the protocol
69 */
70#define OPEN_MSG 0
71#define CLOSED_MSG 1
72
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090073/*
Per Lidenb97bf3f2006-01-02 19:04:38 +010074 * State value stored in 'exp_msg_count'
75 */
Per Lidenb97bf3f2006-01-02 19:04:38 +010076#define START_CHANGEOVER 100000u
77
Paul Gortmakera18c4bc2011-12-29 20:58:42 -050078static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,
Per Lidenb97bf3f2006-01-02 19:04:38 +010079 struct sk_buff *buf);
Ying Xue247f0f32014-02-18 16:06:46 +080080static void tipc_link_proto_rcv(struct tipc_link *l_ptr, struct sk_buff *buf);
Jon Paul Maloy3bb53382014-02-13 17:29:12 -050081static int tipc_link_tunnel_rcv(struct tipc_node *n_ptr,
Jon Paul Maloy170b3922014-01-07 17:02:41 -050082 struct sk_buff **buf);
Paul Gortmakera18c4bc2011-12-29 20:58:42 -050083static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tolerance);
Paul Gortmakera18c4bc2011-12-29 20:58:42 -050084static void link_state_event(struct tipc_link *l_ptr, u32 event);
85static void link_reset_statistics(struct tipc_link *l_ptr);
86static void link_print(struct tipc_link *l_ptr, const char *str);
Ying Xue247f0f32014-02-18 16:06:46 +080087static void tipc_link_sync_xmit(struct tipc_link *l);
88static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf);
Erik Hugne7ae934b2014-07-01 10:22:40 +020089static int tipc_link_input(struct tipc_link *l, struct sk_buff *buf);
90static int tipc_link_prepare_input(struct tipc_link *l, struct sk_buff **buf);
stephen hemminger31e3c3f2010-10-13 13:20:35 +000091
Per Lidenb97bf3f2006-01-02 19:04:38 +010092/*
Sam Ravnborg05790c62006-03-20 22:37:04 -080093 * Simple link routines
Per Lidenb97bf3f2006-01-02 19:04:38 +010094 */
Sam Ravnborg05790c62006-03-20 22:37:04 -080095static unsigned int align(unsigned int i)
Per Lidenb97bf3f2006-01-02 19:04:38 +010096{
97 return (i + 3) & ~3u;
98}
99
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500100static void link_init_max_pkt(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100101{
Ying Xue7a2f7d12014-04-21 10:55:46 +0800102 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100103 u32 max_pkt;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900104
Ying Xue7a2f7d12014-04-21 10:55:46 +0800105 rcu_read_lock();
106 b_ptr = rcu_dereference_rtnl(bearer_list[l_ptr->bearer_id]);
107 if (!b_ptr) {
108 rcu_read_unlock();
109 return;
110 }
111 max_pkt = (b_ptr->mtu & ~3);
112 rcu_read_unlock();
113
Per Lidenb97bf3f2006-01-02 19:04:38 +0100114 if (max_pkt > MAX_MSG_SIZE)
115 max_pkt = MAX_MSG_SIZE;
116
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900117 l_ptr->max_pkt_target = max_pkt;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100118 if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT)
119 l_ptr->max_pkt = l_ptr->max_pkt_target;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900120 else
Per Lidenb97bf3f2006-01-02 19:04:38 +0100121 l_ptr->max_pkt = MAX_PKT_DEFAULT;
122
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900123 l_ptr->max_pkt_probes = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100124}
125
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500126static u32 link_next_sent(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100127{
128 if (l_ptr->next_out)
Allan Stephensf9057302011-10-24 16:03:12 -0400129 return buf_seqno(l_ptr->next_out);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100130 return mod(l_ptr->next_out_no);
131}
132
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500133static u32 link_last_sent(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100134{
135 return mod(link_next_sent(l_ptr) - 1);
136}
137
138/*
Sam Ravnborg05790c62006-03-20 22:37:04 -0800139 * Simple non-static link routines (i.e. referenced outside this file)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100140 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500141int tipc_link_is_up(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100142{
143 if (!l_ptr)
144 return 0;
Eric Dumazeta02cec22010-09-22 20:43:57 +0000145 return link_working_working(l_ptr) || link_working_unknown(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100146}
147
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500148int tipc_link_is_active(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100149{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000150 return (l_ptr->owner->active_links[0] == l_ptr) ||
151 (l_ptr->owner->active_links[1] == l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100152}
153
154/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100155 * link_timeout - handle expiration of link timer
156 * @l_ptr: pointer to link
Per Lidenb97bf3f2006-01-02 19:04:38 +0100157 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500158static void link_timeout(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100159{
Per Liden4323add2006-01-18 00:38:21 +0100160 tipc_node_lock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100161
162 /* update counters used in statistical profiling of send traffic */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100163 l_ptr->stats.accu_queue_sz += l_ptr->out_queue_size;
164 l_ptr->stats.queue_sz_counts++;
165
Per Lidenb97bf3f2006-01-02 19:04:38 +0100166 if (l_ptr->first_out) {
167 struct tipc_msg *msg = buf_msg(l_ptr->first_out);
168 u32 length = msg_size(msg);
169
Joe Perchesf64f9e72009-11-29 16:55:45 -0800170 if ((msg_user(msg) == MSG_FRAGMENTER) &&
171 (msg_type(msg) == FIRST_FRAGMENT)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100172 length = msg_size(msg_get_wrapped(msg));
173 }
174 if (length) {
175 l_ptr->stats.msg_lengths_total += length;
176 l_ptr->stats.msg_length_counts++;
177 if (length <= 64)
178 l_ptr->stats.msg_length_profile[0]++;
179 else if (length <= 256)
180 l_ptr->stats.msg_length_profile[1]++;
181 else if (length <= 1024)
182 l_ptr->stats.msg_length_profile[2]++;
183 else if (length <= 4096)
184 l_ptr->stats.msg_length_profile[3]++;
185 else if (length <= 16384)
186 l_ptr->stats.msg_length_profile[4]++;
187 else if (length <= 32768)
188 l_ptr->stats.msg_length_profile[5]++;
189 else
190 l_ptr->stats.msg_length_profile[6]++;
191 }
192 }
193
194 /* do all other link processing performed on a periodic basis */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100195
196 link_state_event(l_ptr, TIMEOUT_EVT);
197
198 if (l_ptr->next_out)
Per Liden4323add2006-01-18 00:38:21 +0100199 tipc_link_push_queue(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100200
Per Liden4323add2006-01-18 00:38:21 +0100201 tipc_node_unlock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100202}
203
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500204static void link_set_timer(struct tipc_link *l_ptr, u32 time)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100205{
206 k_start_timer(&l_ptr->timer, time);
207}
208
209/**
Per Liden4323add2006-01-18 00:38:21 +0100210 * tipc_link_create - create a new link
Allan Stephens37b9c082011-02-28 11:32:27 -0500211 * @n_ptr: pointer to associated node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100212 * @b_ptr: pointer to associated bearer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100213 * @media_addr: media address to use when sending messages over link
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900214 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100215 * Returns pointer to link.
216 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500217struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
Ying Xuec61dd612014-02-13 17:29:09 -0500218 struct tipc_bearer *b_ptr,
219 const struct tipc_media_addr *media_addr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100220{
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500221 struct tipc_link *l_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100222 struct tipc_msg *msg;
223 char *if_name;
Allan Stephens37b9c082011-02-28 11:32:27 -0500224 char addr_string[16];
225 u32 peer = n_ptr->addr;
226
227 if (n_ptr->link_cnt >= 2) {
228 tipc_addr_string_fill(addr_string, n_ptr->addr);
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400229 pr_err("Attempt to establish third link to %s\n", addr_string);
Allan Stephens37b9c082011-02-28 11:32:27 -0500230 return NULL;
231 }
232
233 if (n_ptr->links[b_ptr->identity]) {
234 tipc_addr_string_fill(addr_string, n_ptr->addr);
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400235 pr_err("Attempt to establish second link on <%s> to %s\n",
236 b_ptr->name, addr_string);
Allan Stephens37b9c082011-02-28 11:32:27 -0500237 return NULL;
238 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100239
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700240 l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100241 if (!l_ptr) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400242 pr_warn("Link creation failed, no memory\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100243 return NULL;
244 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100245
246 l_ptr->addr = peer;
Allan Stephens2d627b92011-01-07 13:00:11 -0500247 if_name = strchr(b_ptr->name, ':') + 1;
Allan Stephens062b4c92011-04-07 09:28:47 -0400248 sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
Per Lidenb97bf3f2006-01-02 19:04:38 +0100249 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900250 tipc_node(tipc_own_addr),
Per Lidenb97bf3f2006-01-02 19:04:38 +0100251 if_name,
252 tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
Allan Stephens062b4c92011-04-07 09:28:47 -0400253 /* note: peer i/f name is updated by reset/activate message */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100254 memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
Allan Stephens37b9c082011-02-28 11:32:27 -0500255 l_ptr->owner = n_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100256 l_ptr->checkpoint = 1;
Allan Stephensf882cb72011-04-07 09:43:27 -0400257 l_ptr->peer_session = INVALID_SESSION;
Ying Xue7a2f7d12014-04-21 10:55:46 +0800258 l_ptr->bearer_id = b_ptr->identity;
Allan Stephens5c216e12011-10-18 11:34:29 -0400259 link_set_supervision_props(l_ptr, b_ptr->tolerance);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100260 l_ptr->state = RESET_UNKNOWN;
261
262 l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
263 msg = l_ptr->pmsg;
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000264 tipc_msg_init(msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, l_ptr->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100265 msg_set_size(msg, sizeof(l_ptr->proto_msg));
Allan Stephensa686e682008-06-04 17:29:39 -0700266 msg_set_session(msg, (tipc_random & 0xffff));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100267 msg_set_bearer_id(msg, b_ptr->identity);
268 strcpy((char *)msg_data(msg), if_name);
269
270 l_ptr->priority = b_ptr->priority;
Allan Stephens5c216e12011-10-18 11:34:29 -0400271 tipc_link_set_queue_limits(l_ptr, b_ptr->window);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100272
Ying Xue7a2f7d12014-04-21 10:55:46 +0800273 l_ptr->net_plane = b_ptr->net_plane;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100274 link_init_max_pkt(l_ptr);
275
276 l_ptr->next_out_no = 1;
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400277 __skb_queue_head_init(&l_ptr->waiting_sks);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100278
279 link_reset_statistics(l_ptr);
280
Allan Stephens37b9c082011-02-28 11:32:27 -0500281 tipc_node_attach_link(n_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100282
Jon Paul Maloy170b3922014-01-07 17:02:41 -0500283 k_init_timer(&l_ptr->timer, (Handler)link_timeout,
284 (unsigned long)l_ptr);
Jon Paul Maloy581465f2014-01-07 17:02:44 -0500285
286 link_state_event(l_ptr, STARTING_EVT);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100287
Per Lidenb97bf3f2006-01-02 19:04:38 +0100288 return l_ptr;
289}
290
Jon Paul Maloy7d339392014-02-13 17:29:16 -0500291void tipc_link_delete_list(unsigned int bearer_id, bool shutting_down)
Ying Xue8d8439b2014-02-13 17:29:07 -0500292{
293 struct tipc_link *l_ptr;
Ying Xuec61dd612014-02-13 17:29:09 -0500294 struct tipc_node *n_ptr;
Ying Xue8d8439b2014-02-13 17:29:07 -0500295
Ying Xue6c7a7622014-03-27 12:54:37 +0800296 rcu_read_lock();
297 list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
Ying Xue5356f3d2014-05-05 08:56:09 +0800298 tipc_node_lock(n_ptr);
Ying Xuec61dd612014-02-13 17:29:09 -0500299 l_ptr = n_ptr->links[bearer_id];
300 if (l_ptr) {
301 tipc_link_reset(l_ptr);
Jon Paul Maloy7d339392014-02-13 17:29:16 -0500302 if (shutting_down || !tipc_node_is_up(n_ptr)) {
303 tipc_node_detach_link(l_ptr->owner, l_ptr);
304 tipc_link_reset_fragments(l_ptr);
Ying Xue5356f3d2014-05-05 08:56:09 +0800305 tipc_node_unlock(n_ptr);
Ying Xuec61dd612014-02-13 17:29:09 -0500306
Jon Paul Maloy7d339392014-02-13 17:29:16 -0500307 /* Nobody else can access this link now: */
308 del_timer_sync(&l_ptr->timer);
309 kfree(l_ptr);
310 } else {
311 /* Detach/delete when failover is finished: */
312 l_ptr->flags |= LINK_STOPPED;
Ying Xue5356f3d2014-05-05 08:56:09 +0800313 tipc_node_unlock(n_ptr);
Jon Paul Maloy7d339392014-02-13 17:29:16 -0500314 del_timer_sync(&l_ptr->timer);
315 }
Ying Xuec61dd612014-02-13 17:29:09 -0500316 continue;
317 }
Ying Xue5356f3d2014-05-05 08:56:09 +0800318 tipc_node_unlock(n_ptr);
Ying Xue8d8439b2014-02-13 17:29:07 -0500319 }
Ying Xue6c7a7622014-03-27 12:54:37 +0800320 rcu_read_unlock();
Ying Xue8d8439b2014-02-13 17:29:07 -0500321}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100322
323/**
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400324 * link_schedule_user - schedule user for wakeup after congestion
325 * @link: congested link
326 * @oport: sending port
327 * @chain_sz: size of buffer chain that was attempted sent
328 * @imp: importance of message attempted sent
329 * Create pseudo msg to send back to user when congestion abates
Per Lidenb97bf3f2006-01-02 19:04:38 +0100330 */
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400331static bool link_schedule_user(struct tipc_link *link, u32 oport,
332 uint chain_sz, uint imp)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100333{
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400334 struct sk_buff *buf;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100335
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400336 buf = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, tipc_own_addr,
337 tipc_own_addr, oport, 0, 0);
338 if (!buf)
339 return false;
340 TIPC_SKB_CB(buf)->chain_sz = chain_sz;
341 TIPC_SKB_CB(buf)->chain_imp = imp;
342 __skb_queue_tail(&link->waiting_sks, buf);
343 link->stats.link_congs++;
344 return true;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100345}
346
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400347/**
348 * link_prepare_wakeup - prepare users for wakeup after congestion
349 * @link: congested link
350 * Move a number of waiting users, as permitted by available space in
351 * the send queue, from link wait queue to node wait queue for wakeup
352 */
353static void link_prepare_wakeup(struct tipc_link *link)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100354{
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400355 struct sk_buff_head *wq = &link->waiting_sks;
356 struct sk_buff *buf;
357 uint pend_qsz = link->out_queue_size;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100358
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400359 for (buf = skb_peek(wq); buf; buf = skb_peek(wq)) {
360 if (pend_qsz >= link->queue_limit[TIPC_SKB_CB(buf)->chain_imp])
Per Lidenb97bf3f2006-01-02 19:04:38 +0100361 break;
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400362 pend_qsz += TIPC_SKB_CB(buf)->chain_sz;
363 __skb_queue_tail(&link->owner->waiting_sks, __skb_dequeue(wq));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100364 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100365}
366
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900367/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100368 * link_release_outqueue - purge link's outbound message queue
369 * @l_ptr: pointer to link
370 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500371static void link_release_outqueue(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100372{
Ying Xued77b3832013-12-10 20:45:38 -0800373 kfree_skb_list(l_ptr->first_out);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100374 l_ptr->first_out = NULL;
375 l_ptr->out_queue_size = 0;
376}
377
378/**
Per Liden4323add2006-01-18 00:38:21 +0100379 * tipc_link_reset_fragments - purge link's inbound message fragments queue
Per Lidenb97bf3f2006-01-02 19:04:38 +0100380 * @l_ptr: pointer to link
381 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500382void tipc_link_reset_fragments(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100383{
Jon Paul Maloy37e22162014-05-14 05:39:12 -0400384 kfree_skb(l_ptr->reasm_buf);
385 l_ptr->reasm_buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100386}
387
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900388/**
Jon Paul Maloy581465f2014-01-07 17:02:44 -0500389 * tipc_link_purge_queues - purge all pkt queues associated with link
Per Lidenb97bf3f2006-01-02 19:04:38 +0100390 * @l_ptr: pointer to link
391 */
Jon Paul Maloy581465f2014-01-07 17:02:44 -0500392void tipc_link_purge_queues(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100393{
Ying Xued77b3832013-12-10 20:45:38 -0800394 kfree_skb_list(l_ptr->oldest_deferred_in);
395 kfree_skb_list(l_ptr->first_out);
Per Liden4323add2006-01-18 00:38:21 +0100396 tipc_link_reset_fragments(l_ptr);
Allan Stephens5f6d9122011-11-04 13:24:29 -0400397 kfree_skb(l_ptr->proto_msg_queue);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100398 l_ptr->proto_msg_queue = NULL;
399}
400
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500401void tipc_link_reset(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100402{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100403 u32 prev_state = l_ptr->state;
404 u32 checkpoint = l_ptr->next_in_no;
Allan Stephens5392d642006-06-25 23:52:50 -0700405 int was_active_link = tipc_link_is_active(l_ptr);
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400406 struct tipc_node *owner = l_ptr->owner;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900407
Allan Stephensa686e682008-06-04 17:29:39 -0700408 msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100409
Allan Stephensa686e682008-06-04 17:29:39 -0700410 /* Link is down, accept any session */
411 l_ptr->peer_session = INVALID_SESSION;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100412
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900413 /* Prepare for max packet size negotiation */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100414 link_init_max_pkt(l_ptr);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900415
Per Lidenb97bf3f2006-01-02 19:04:38 +0100416 l_ptr->state = RESET_UNKNOWN;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100417
418 if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
419 return;
420
Per Liden4323add2006-01-18 00:38:21 +0100421 tipc_node_link_down(l_ptr->owner, l_ptr);
Ying Xue7a2f7d12014-04-21 10:55:46 +0800422 tipc_bearer_remove_dest(l_ptr->bearer_id, l_ptr->addr);
Paul Gortmaker7368ddf2010-10-12 14:25:58 +0000423
Jon Paul Maloyb9d4c332014-01-07 17:02:42 -0500424 if (was_active_link && tipc_node_active_links(l_ptr->owner)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100425 l_ptr->reset_checkpoint = checkpoint;
426 l_ptr->exp_msg_count = START_CHANGEOVER;
427 }
428
429 /* Clean up all queues: */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100430 link_release_outqueue(l_ptr);
Allan Stephens5f6d9122011-11-04 13:24:29 -0400431 kfree_skb(l_ptr->proto_msg_queue);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100432 l_ptr->proto_msg_queue = NULL;
Ying Xued77b3832013-12-10 20:45:38 -0800433 kfree_skb_list(l_ptr->oldest_deferred_in);
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400434 if (!skb_queue_empty(&l_ptr->waiting_sks)) {
435 skb_queue_splice_init(&l_ptr->waiting_sks, &owner->waiting_sks);
436 owner->action_flags |= TIPC_WAKEUP_USERS;
437 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100438 l_ptr->retransm_queue_head = 0;
439 l_ptr->retransm_queue_size = 0;
440 l_ptr->last_out = NULL;
441 l_ptr->first_out = NULL;
442 l_ptr->next_out = NULL;
443 l_ptr->unacked_window = 0;
444 l_ptr->checkpoint = 1;
445 l_ptr->next_out_no = 1;
446 l_ptr->deferred_inqueue_sz = 0;
447 l_ptr->oldest_deferred_in = NULL;
448 l_ptr->newest_deferred_in = NULL;
449 l_ptr->fsm_msg_cnt = 0;
450 l_ptr->stale_count = 0;
451 link_reset_statistics(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100452}
453
Ying Xuec61dd612014-02-13 17:29:09 -0500454void tipc_link_reset_list(unsigned int bearer_id)
Ying Xuee0ca2c32014-02-13 17:29:06 -0500455{
456 struct tipc_link *l_ptr;
Ying Xuec61dd612014-02-13 17:29:09 -0500457 struct tipc_node *n_ptr;
Ying Xuee0ca2c32014-02-13 17:29:06 -0500458
Ying Xue6c7a7622014-03-27 12:54:37 +0800459 rcu_read_lock();
460 list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
Ying Xue5356f3d2014-05-05 08:56:09 +0800461 tipc_node_lock(n_ptr);
Ying Xuec61dd612014-02-13 17:29:09 -0500462 l_ptr = n_ptr->links[bearer_id];
463 if (l_ptr)
464 tipc_link_reset(l_ptr);
Ying Xue5356f3d2014-05-05 08:56:09 +0800465 tipc_node_unlock(n_ptr);
Ying Xuee0ca2c32014-02-13 17:29:06 -0500466 }
Ying Xue6c7a7622014-03-27 12:54:37 +0800467 rcu_read_unlock();
Ying Xuee0ca2c32014-02-13 17:29:06 -0500468}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100469
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500470static void link_activate(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100471{
Allan Stephens5392d642006-06-25 23:52:50 -0700472 l_ptr->next_in_no = l_ptr->stats.recv_info = 1;
Per Liden4323add2006-01-18 00:38:21 +0100473 tipc_node_link_up(l_ptr->owner, l_ptr);
Ying Xue7a2f7d12014-04-21 10:55:46 +0800474 tipc_bearer_add_dest(l_ptr->bearer_id, l_ptr->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100475}
476
477/**
478 * link_state_event - link finite state machine
479 * @l_ptr: pointer to link
480 * @event: state machine event to process
481 */
Eric Dumazet95c96172012-04-15 05:58:06 +0000482static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100483{
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500484 struct tipc_link *other;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100485 u32 cont_intv = l_ptr->continuity_interval;
486
Jon Paul Maloy7d339392014-02-13 17:29:16 -0500487 if (l_ptr->flags & LINK_STOPPED)
488 return;
489
Ying Xue135daee2014-02-13 17:29:08 -0500490 if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100491 return; /* Not yet. */
492
Ying Xue77a7e072013-12-10 20:45:44 -0800493 /* Check whether changeover is going on */
494 if (l_ptr->exp_msg_count) {
Allan Stephensa0168922010-12-31 18:59:35 +0000495 if (event == TIMEOUT_EVT)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100496 link_set_timer(l_ptr, cont_intv);
Ying Xue77a7e072013-12-10 20:45:44 -0800497 return;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100498 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100499
500 switch (l_ptr->state) {
501 case WORKING_WORKING:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100502 switch (event) {
503 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100504 case ACTIVATE_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100505 break;
506 case TIMEOUT_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100507 if (l_ptr->next_in_no != l_ptr->checkpoint) {
508 l_ptr->checkpoint = l_ptr->next_in_no;
Per Liden4323add2006-01-18 00:38:21 +0100509 if (tipc_bclink_acks_missing(l_ptr->owner)) {
Ying Xue247f0f32014-02-18 16:06:46 +0800510 tipc_link_proto_xmit(l_ptr, STATE_MSG,
511 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100512 l_ptr->fsm_msg_cnt++;
513 } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
Ying Xue247f0f32014-02-18 16:06:46 +0800514 tipc_link_proto_xmit(l_ptr, STATE_MSG,
515 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100516 l_ptr->fsm_msg_cnt++;
517 }
518 link_set_timer(l_ptr, cont_intv);
519 break;
520 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100521 l_ptr->state = WORKING_UNKNOWN;
522 l_ptr->fsm_msg_cnt = 0;
Ying Xue247f0f32014-02-18 16:06:46 +0800523 tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100524 l_ptr->fsm_msg_cnt++;
525 link_set_timer(l_ptr, cont_intv / 4);
526 break;
527 case RESET_MSG:
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400528 pr_info("%s<%s>, requested by peer\n", link_rst_msg,
529 l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100530 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100531 l_ptr->state = RESET_RESET;
532 l_ptr->fsm_msg_cnt = 0;
Ying Xue247f0f32014-02-18 16:06:46 +0800533 tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
534 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100535 l_ptr->fsm_msg_cnt++;
536 link_set_timer(l_ptr, cont_intv);
537 break;
538 default:
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400539 pr_err("%s%u in WW state\n", link_unk_evt, event);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100540 }
541 break;
542 case WORKING_UNKNOWN:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100543 switch (event) {
544 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100545 case ACTIVATE_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100546 l_ptr->state = WORKING_WORKING;
547 l_ptr->fsm_msg_cnt = 0;
548 link_set_timer(l_ptr, cont_intv);
549 break;
550 case RESET_MSG:
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400551 pr_info("%s<%s>, requested by peer while probing\n",
552 link_rst_msg, l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100553 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100554 l_ptr->state = RESET_RESET;
555 l_ptr->fsm_msg_cnt = 0;
Ying Xue247f0f32014-02-18 16:06:46 +0800556 tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
557 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100558 l_ptr->fsm_msg_cnt++;
559 link_set_timer(l_ptr, cont_intv);
560 break;
561 case TIMEOUT_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100562 if (l_ptr->next_in_no != l_ptr->checkpoint) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100563 l_ptr->state = WORKING_WORKING;
564 l_ptr->fsm_msg_cnt = 0;
565 l_ptr->checkpoint = l_ptr->next_in_no;
Per Liden4323add2006-01-18 00:38:21 +0100566 if (tipc_bclink_acks_missing(l_ptr->owner)) {
Ying Xue247f0f32014-02-18 16:06:46 +0800567 tipc_link_proto_xmit(l_ptr, STATE_MSG,
568 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100569 l_ptr->fsm_msg_cnt++;
570 }
571 link_set_timer(l_ptr, cont_intv);
572 } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
Ying Xue247f0f32014-02-18 16:06:46 +0800573 tipc_link_proto_xmit(l_ptr, STATE_MSG,
574 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100575 l_ptr->fsm_msg_cnt++;
576 link_set_timer(l_ptr, cont_intv / 4);
577 } else { /* Link has failed */
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400578 pr_warn("%s<%s>, peer not responding\n",
579 link_rst_msg, l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100580 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100581 l_ptr->state = RESET_UNKNOWN;
582 l_ptr->fsm_msg_cnt = 0;
Ying Xue247f0f32014-02-18 16:06:46 +0800583 tipc_link_proto_xmit(l_ptr, RESET_MSG,
584 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100585 l_ptr->fsm_msg_cnt++;
586 link_set_timer(l_ptr, cont_intv);
587 }
588 break;
589 default:
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400590 pr_err("%s%u in WU state\n", link_unk_evt, event);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100591 }
592 break;
593 case RESET_UNKNOWN:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100594 switch (event) {
595 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100596 break;
597 case ACTIVATE_MSG:
598 other = l_ptr->owner->active_links[0];
Allan Stephens8d64a5b2010-12-31 18:59:27 +0000599 if (other && link_working_unknown(other))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100600 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100601 l_ptr->state = WORKING_WORKING;
602 l_ptr->fsm_msg_cnt = 0;
603 link_activate(l_ptr);
Ying Xue247f0f32014-02-18 16:06:46 +0800604 tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100605 l_ptr->fsm_msg_cnt++;
Jon Maloyc64f7a62012-11-16 13:51:31 +0800606 if (l_ptr->owner->working_links == 1)
Ying Xue247f0f32014-02-18 16:06:46 +0800607 tipc_link_sync_xmit(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100608 link_set_timer(l_ptr, cont_intv);
609 break;
610 case RESET_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100611 l_ptr->state = RESET_RESET;
612 l_ptr->fsm_msg_cnt = 0;
Ying Xue247f0f32014-02-18 16:06:46 +0800613 tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
614 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100615 l_ptr->fsm_msg_cnt++;
616 link_set_timer(l_ptr, cont_intv);
617 break;
618 case STARTING_EVT:
Ying Xue135daee2014-02-13 17:29:08 -0500619 l_ptr->flags |= LINK_STARTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100620 /* fall through */
621 case TIMEOUT_EVT:
Ying Xue247f0f32014-02-18 16:06:46 +0800622 tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100623 l_ptr->fsm_msg_cnt++;
624 link_set_timer(l_ptr, cont_intv);
625 break;
626 default:
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400627 pr_err("%s%u in RU state\n", link_unk_evt, event);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100628 }
629 break;
630 case RESET_RESET:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100631 switch (event) {
632 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100633 case ACTIVATE_MSG:
634 other = l_ptr->owner->active_links[0];
Allan Stephens8d64a5b2010-12-31 18:59:27 +0000635 if (other && link_working_unknown(other))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100636 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100637 l_ptr->state = WORKING_WORKING;
638 l_ptr->fsm_msg_cnt = 0;
639 link_activate(l_ptr);
Ying Xue247f0f32014-02-18 16:06:46 +0800640 tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100641 l_ptr->fsm_msg_cnt++;
Jon Maloyc64f7a62012-11-16 13:51:31 +0800642 if (l_ptr->owner->working_links == 1)
Ying Xue247f0f32014-02-18 16:06:46 +0800643 tipc_link_sync_xmit(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100644 link_set_timer(l_ptr, cont_intv);
645 break;
646 case RESET_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100647 break;
648 case TIMEOUT_EVT:
Ying Xue247f0f32014-02-18 16:06:46 +0800649 tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
650 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100651 l_ptr->fsm_msg_cnt++;
652 link_set_timer(l_ptr, cont_intv);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100653 break;
654 default:
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400655 pr_err("%s%u in RR state\n", link_unk_evt, event);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100656 }
657 break;
658 default:
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400659 pr_err("Unknown link state %u/%u\n", l_ptr->state, event);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100660 }
661}
662
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500663/* tipc_link_cong: determine return value and how to treat the
664 * sent buffer during link congestion.
665 * - For plain, errorless user data messages we keep the buffer and
666 * return -ELINKONG.
667 * - For all other messages we discard the buffer and return -EHOSTUNREACH
668 * - For TIPC internal messages we also reset the link
669 */
670static int tipc_link_cong(struct tipc_link *link, struct sk_buff *buf)
671{
672 struct tipc_msg *msg = buf_msg(buf);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500673 uint imp = tipc_msg_tot_importance(msg);
674 u32 oport = msg_tot_origport(msg);
675
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400676 if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) {
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500677 pr_warn("%s<%s>, send queue full", link_rst_msg, link->name);
678 tipc_link_reset(link);
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400679 goto drop;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500680 }
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400681 if (unlikely(msg_errcode(msg)))
682 goto drop;
683 if (unlikely(msg_reroute_cnt(msg)))
684 goto drop;
685 if (TIPC_SKB_CB(buf)->wakeup_pending)
686 return -ELINKCONG;
687 if (link_schedule_user(link, oport, TIPC_SKB_CB(buf)->chain_sz, imp))
688 return -ELINKCONG;
689drop:
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500690 kfree_skb_list(buf);
691 return -EHOSTUNREACH;
692}
693
694/**
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -0400695 * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500696 * @link: link to use
697 * @buf: chain of buffers containing message
698 * Consumes the buffer chain, except when returning -ELINKCONG
699 * Returns 0 if success, otherwise errno: -ELINKCONG, -EMSGSIZE (plain socket
700 * user data messages) or -EHOSTUNREACH (all other messages/senders)
701 * Only the socket functions tipc_send_stream() and tipc_send_packet() need
702 * to act on the return value, since they may need to do more send attempts.
703 */
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -0400704int __tipc_link_xmit(struct tipc_link *link, struct sk_buff *buf)
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500705{
706 struct tipc_msg *msg = buf_msg(buf);
707 uint psz = msg_size(msg);
708 uint qsz = link->out_queue_size;
709 uint sndlim = link->queue_limit[0];
710 uint imp = tipc_msg_tot_importance(msg);
711 uint mtu = link->max_pkt;
712 uint ack = mod(link->next_in_no - 1);
713 uint seqno = link->next_out_no;
714 uint bc_last_in = link->owner->bclink.last_in;
715 struct tipc_media_addr *addr = &link->media_addr;
716 struct sk_buff *next = buf->next;
717
718 /* Match queue limits against msg importance: */
719 if (unlikely(qsz >= link->queue_limit[imp]))
720 return tipc_link_cong(link, buf);
721
722 /* Has valid packet limit been used ? */
723 if (unlikely(psz > mtu)) {
724 kfree_skb_list(buf);
725 return -EMSGSIZE;
726 }
727
728 /* Prepare each packet for sending, and add to outqueue: */
729 while (buf) {
730 next = buf->next;
731 msg = buf_msg(buf);
732 msg_set_word(msg, 2, ((ack << 16) | mod(seqno)));
733 msg_set_bcast_ack(msg, bc_last_in);
734
735 if (!link->first_out) {
736 link->first_out = buf;
737 } else if (qsz < sndlim) {
738 link->last_out->next = buf;
739 } else if (tipc_msg_bundle(link->last_out, buf, mtu)) {
740 link->stats.sent_bundled++;
741 buf = next;
742 next = buf->next;
743 continue;
744 } else if (tipc_msg_make_bundle(&buf, mtu, link->addr)) {
745 link->stats.sent_bundled++;
746 link->stats.sent_bundles++;
747 link->last_out->next = buf;
748 if (!link->next_out)
749 link->next_out = buf;
750 } else {
751 link->last_out->next = buf;
752 if (!link->next_out)
753 link->next_out = buf;
754 }
755
756 /* Send packet if possible: */
757 if (likely(++qsz <= sndlim)) {
758 tipc_bearer_send(link->bearer_id, buf, addr);
759 link->next_out = next;
760 link->unacked_window = 0;
761 }
762 seqno++;
763 link->last_out = buf;
764 buf = next;
765 }
766 link->next_out_no = seqno;
767 link->out_queue_size = qsz;
768 return 0;
769}
770
771/**
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -0400772 * tipc_link_xmit() is the general link level function for message sending
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500773 * @buf: chain of buffers containing message
774 * @dsz: amount of user data to be sent
775 * @dnode: address of destination node
776 * @selector: a number used for deterministic link selection
777 * Consumes the buffer chain, except when returning -ELINKCONG
778 * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
779 */
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -0400780int tipc_link_xmit(struct sk_buff *buf, u32 dnode, u32 selector)
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500781{
782 struct tipc_link *link = NULL;
783 struct tipc_node *node;
784 int rc = -EHOSTUNREACH;
785
786 node = tipc_node_find(dnode);
787 if (node) {
788 tipc_node_lock(node);
789 link = node->active_links[selector & 1];
790 if (link)
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -0400791 rc = __tipc_link_xmit(link, buf);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500792 tipc_node_unlock(node);
793 }
794
795 if (link)
796 return rc;
797
798 if (likely(in_own_node(dnode)))
799 return tipc_sk_rcv(buf);
800
801 kfree_skb_list(buf);
802 return rc;
803}
804
Jon Maloyc64f7a62012-11-16 13:51:31 +0800805/*
Ying Xue247f0f32014-02-18 16:06:46 +0800806 * tipc_link_sync_xmit - synchronize broadcast link endpoints.
Jon Maloyc64f7a62012-11-16 13:51:31 +0800807 *
808 * Give a newly added peer node the sequence number where it should
809 * start receiving and acking broadcast packets.
810 *
811 * Called with node locked
812 */
Jon Paul Maloy25b660c2014-07-16 20:40:59 -0400813static void tipc_link_sync_xmit(struct tipc_link *link)
Jon Maloyc64f7a62012-11-16 13:51:31 +0800814{
815 struct sk_buff *buf;
816 struct tipc_msg *msg;
817
818 buf = tipc_buf_acquire(INT_H_SIZE);
819 if (!buf)
820 return;
821
822 msg = buf_msg(buf);
Jon Paul Maloy25b660c2014-07-16 20:40:59 -0400823 tipc_msg_init(msg, BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, link->addr);
824 msg_set_last_bcast(msg, link->owner->bclink.acked);
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -0400825 __tipc_link_xmit(link, buf);
Jon Maloyc64f7a62012-11-16 13:51:31 +0800826}
827
828/*
Ying Xue247f0f32014-02-18 16:06:46 +0800829 * tipc_link_sync_rcv - synchronize broadcast link endpoints.
Jon Maloyc64f7a62012-11-16 13:51:31 +0800830 * Receive the sequence number where we should start receiving and
831 * acking broadcast packets from a newly added peer node, and open
832 * up for reception of such packets.
833 *
834 * Called with node locked
835 */
Ying Xue247f0f32014-02-18 16:06:46 +0800836static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf)
Jon Maloyc64f7a62012-11-16 13:51:31 +0800837{
838 struct tipc_msg *msg = buf_msg(buf);
839
840 n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg);
841 n->bclink.recv_permitted = true;
842 kfree_skb(buf);
843}
844
845/*
Per Liden4323add2006-01-18 00:38:21 +0100846 * tipc_link_push_packet: Push one unsent packet to the media
Per Lidenb97bf3f2006-01-02 19:04:38 +0100847 */
stephen hemminger98056962014-01-04 13:47:48 -0800848static u32 tipc_link_push_packet(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100849{
850 struct sk_buff *buf = l_ptr->first_out;
851 u32 r_q_size = l_ptr->retransm_queue_size;
852 u32 r_q_head = l_ptr->retransm_queue_head;
853
854 /* Step to position where retransmission failed, if any, */
855 /* consider that buffers may have been released in meantime */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100856 if (r_q_size && buf) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900857 u32 last = lesser(mod(r_q_head + r_q_size),
Per Lidenb97bf3f2006-01-02 19:04:38 +0100858 link_last_sent(l_ptr));
Allan Stephensf9057302011-10-24 16:03:12 -0400859 u32 first = buf_seqno(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100860
861 while (buf && less(first, r_q_head)) {
862 first = mod(first + 1);
863 buf = buf->next;
864 }
865 l_ptr->retransm_queue_head = r_q_head = first;
866 l_ptr->retransm_queue_size = r_q_size = mod(last - first);
867 }
868
869 /* Continue retransmission now, if there is anything: */
Neil Hormanca509102010-03-15 07:58:45 +0000870 if (r_q_size && buf) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100871 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900872 msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
Ying Xue7a2f7d12014-04-21 10:55:46 +0800873 tipc_bearer_send(l_ptr->bearer_id, buf, &l_ptr->media_addr);
Ying Xue3c294cb2012-11-15 11:34:45 +0800874 l_ptr->retransm_queue_head = mod(++r_q_head);
875 l_ptr->retransm_queue_size = --r_q_size;
876 l_ptr->stats.retransmitted++;
877 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100878 }
879
880 /* Send deferred protocol message, if any: */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100881 buf = l_ptr->proto_msg_queue;
882 if (buf) {
883 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
Allan Stephens0e659672010-12-31 18:59:32 +0000884 msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
Ying Xue7a2f7d12014-04-21 10:55:46 +0800885 tipc_bearer_send(l_ptr->bearer_id, buf, &l_ptr->media_addr);
Ying Xue3c294cb2012-11-15 11:34:45 +0800886 l_ptr->unacked_window = 0;
887 kfree_skb(buf);
888 l_ptr->proto_msg_queue = NULL;
889 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100890 }
891
892 /* Send one deferred data message, if send window not full: */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100893 buf = l_ptr->next_out;
894 if (buf) {
895 struct tipc_msg *msg = buf_msg(buf);
896 u32 next = msg_seqno(msg);
Allan Stephensf9057302011-10-24 16:03:12 -0400897 u32 first = buf_seqno(l_ptr->first_out);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100898
899 if (mod(next - first) < l_ptr->queue_limit[0]) {
900 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900901 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Ying Xue7a2f7d12014-04-21 10:55:46 +0800902 tipc_bearer_send(l_ptr->bearer_id, buf,
903 &l_ptr->media_addr);
Ying Xue3c294cb2012-11-15 11:34:45 +0800904 if (msg_user(msg) == MSG_BUNDLER)
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500905 msg_set_type(msg, BUNDLE_CLOSED);
Ying Xue3c294cb2012-11-15 11:34:45 +0800906 l_ptr->next_out = buf->next;
907 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100908 }
909 }
Ying Xue3c294cb2012-11-15 11:34:45 +0800910 return 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100911}
912
913/*
914 * push_queue(): push out the unsent messages of a link where
915 * congestion has abated. Node is locked
916 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500917void tipc_link_push_queue(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100918{
919 u32 res;
920
Per Lidenb97bf3f2006-01-02 19:04:38 +0100921 do {
Per Liden4323add2006-01-18 00:38:21 +0100922 res = tipc_link_push_packet(l_ptr);
Allan Stephens0e35fd52008-07-14 22:44:01 -0700923 } while (!res);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100924}
925
Ying Xue3f5a12b2014-05-05 08:56:17 +0800926void tipc_link_reset_all(struct tipc_node *node)
Allan Stephensd356eeb2006-06-25 23:40:01 -0700927{
Allan Stephensd356eeb2006-06-25 23:40:01 -0700928 char addr_string[16];
929 u32 i;
930
Ying Xue3f5a12b2014-05-05 08:56:17 +0800931 tipc_node_lock(node);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700932
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400933 pr_warn("Resetting all links to %s\n",
Ying Xue3f5a12b2014-05-05 08:56:17 +0800934 tipc_addr_string_fill(addr_string, node->addr));
Allan Stephensd356eeb2006-06-25 23:40:01 -0700935
936 for (i = 0; i < MAX_BEARERS; i++) {
Ying Xue3f5a12b2014-05-05 08:56:17 +0800937 if (node->links[i]) {
938 link_print(node->links[i], "Resetting link\n");
939 tipc_link_reset(node->links[i]);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700940 }
941 }
942
Ying Xue3f5a12b2014-05-05 08:56:17 +0800943 tipc_node_unlock(node);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700944}
945
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500946static void link_retransmit_failure(struct tipc_link *l_ptr,
Paul Gortmakerae8509c2013-06-17 10:54:47 -0400947 struct sk_buff *buf)
Allan Stephensd356eeb2006-06-25 23:40:01 -0700948{
949 struct tipc_msg *msg = buf_msg(buf);
950
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400951 pr_warn("Retransmission failure on link <%s>\n", l_ptr->name);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700952
953 if (l_ptr->addr) {
Allan Stephensd356eeb2006-06-25 23:40:01 -0700954 /* Handle failure on standard link */
Allan Stephens8d64a5b2010-12-31 18:59:27 +0000955 link_print(l_ptr, "Resetting link\n");
Allan Stephensd356eeb2006-06-25 23:40:01 -0700956 tipc_link_reset(l_ptr);
957
958 } else {
Allan Stephensd356eeb2006-06-25 23:40:01 -0700959 /* Handle failure on broadcast link */
David S. Miller6c000552008-09-02 23:38:32 -0700960 struct tipc_node *n_ptr;
Allan Stephensd356eeb2006-06-25 23:40:01 -0700961 char addr_string[16];
962
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400963 pr_info("Msg seq number: %u, ", msg_seqno(msg));
964 pr_cont("Outstanding acks: %lu\n",
965 (unsigned long) TIPC_SKB_CB(buf)->handle);
Jeff Garzik617dbea2006-10-03 16:25:34 -0700966
Allan Stephens01d83ed2011-01-18 13:53:16 -0500967 n_ptr = tipc_bclink_retransmit_to();
Allan Stephensd356eeb2006-06-25 23:40:01 -0700968 tipc_node_lock(n_ptr);
969
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000970 tipc_addr_string_fill(addr_string, n_ptr->addr);
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400971 pr_info("Broadcast link info for %s\n", addr_string);
Ying Xue389dd9b2012-11-16 13:51:30 +0800972 pr_info("Reception permitted: %d, Acked: %u\n",
973 n_ptr->bclink.recv_permitted,
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400974 n_ptr->bclink.acked);
975 pr_info("Last in: %u, Oos state: %u, Last sent: %u\n",
976 n_ptr->bclink.last_in,
977 n_ptr->bclink.oos_state,
978 n_ptr->bclink.last_sent);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700979
Allan Stephensd356eeb2006-06-25 23:40:01 -0700980 tipc_node_unlock(n_ptr);
981
Ying Xue3f5a12b2014-05-05 08:56:17 +0800982 tipc_bclink_set_flags(TIPC_BCLINK_RESET);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700983 l_ptr->stale_count = 0;
984 }
985}
986
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500987void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *buf,
Per Liden4323add2006-01-18 00:38:21 +0100988 u32 retransmits)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100989{
990 struct tipc_msg *msg;
991
Allan Stephensd356eeb2006-06-25 23:40:01 -0700992 if (!buf)
993 return;
994
995 msg = buf_msg(buf);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900996
Erik Hugne512137e2013-12-06 10:08:00 -0500997 /* Detect repeated retransmit failures */
998 if (l_ptr->last_retransmitted == msg_seqno(msg)) {
999 if (++l_ptr->stale_count > 100) {
1000 link_retransmit_failure(l_ptr, buf);
1001 return;
Allan Stephensd356eeb2006-06-25 23:40:01 -07001002 }
1003 } else {
Erik Hugne512137e2013-12-06 10:08:00 -05001004 l_ptr->last_retransmitted = msg_seqno(msg);
1005 l_ptr->stale_count = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001006 }
Allan Stephensd356eeb2006-06-25 23:40:01 -07001007
Neil Hormanca509102010-03-15 07:58:45 +00001008 while (retransmits && (buf != l_ptr->next_out) && buf) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001009 msg = buf_msg(buf);
1010 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001011 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Ying Xue7a2f7d12014-04-21 10:55:46 +08001012 tipc_bearer_send(l_ptr->bearer_id, buf, &l_ptr->media_addr);
Ying Xue3c294cb2012-11-15 11:34:45 +08001013 buf = buf->next;
1014 retransmits--;
1015 l_ptr->stats.retransmitted++;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001016 }
Allan Stephensd356eeb2006-06-25 23:40:01 -07001017
Per Lidenb97bf3f2006-01-02 19:04:38 +01001018 l_ptr->retransm_queue_head = l_ptr->retransm_queue_size = 0;
1019}
1020
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001021/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001022 * link_insert_deferred_queue - insert deferred messages back into receive chain
1023 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001024static struct sk_buff *link_insert_deferred_queue(struct tipc_link *l_ptr,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001025 struct sk_buff *buf)
1026{
1027 u32 seq_no;
1028
1029 if (l_ptr->oldest_deferred_in == NULL)
1030 return buf;
1031
Allan Stephensf9057302011-10-24 16:03:12 -04001032 seq_no = buf_seqno(l_ptr->oldest_deferred_in);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001033 if (seq_no == mod(l_ptr->next_in_no)) {
1034 l_ptr->newest_deferred_in->next = buf;
1035 buf = l_ptr->oldest_deferred_in;
1036 l_ptr->oldest_deferred_in = NULL;
1037 l_ptr->deferred_inqueue_sz = 0;
1038 }
1039 return buf;
1040}
1041
Allan Stephens85035562008-04-15 19:04:54 -07001042/**
1043 * link_recv_buf_validate - validate basic format of received message
1044 *
1045 * This routine ensures a TIPC message has an acceptable header, and at least
1046 * as much data as the header indicates it should. The routine also ensures
1047 * that the entire message header is stored in the main fragment of the message
1048 * buffer, to simplify future access to message header fields.
1049 *
1050 * Note: Having extra info present in the message header or data areas is OK.
1051 * TIPC will ignore the excess, under the assumption that it is optional info
1052 * introduced by a later release of the protocol.
1053 */
Allan Stephens85035562008-04-15 19:04:54 -07001054static int link_recv_buf_validate(struct sk_buff *buf)
1055{
1056 static u32 min_data_hdr_size[8] = {
Allan Stephens741d9eb2011-05-31 15:03:18 -04001057 SHORT_H_SIZE, MCAST_H_SIZE, NAMED_H_SIZE, BASIC_H_SIZE,
Allan Stephens85035562008-04-15 19:04:54 -07001058 MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE
1059 };
1060
1061 struct tipc_msg *msg;
1062 u32 tipc_hdr[2];
1063 u32 size;
1064 u32 hdr_size;
1065 u32 min_hdr_size;
1066
Erik Hugne64380a02014-02-11 11:38:26 +01001067 /* If this packet comes from the defer queue, the skb has already
1068 * been validated
1069 */
1070 if (unlikely(TIPC_SKB_CB(buf)->deferred))
1071 return 1;
1072
Allan Stephens85035562008-04-15 19:04:54 -07001073 if (unlikely(buf->len < MIN_H_SIZE))
1074 return 0;
1075
1076 msg = skb_header_pointer(buf, 0, sizeof(tipc_hdr), tipc_hdr);
1077 if (msg == NULL)
1078 return 0;
1079
1080 if (unlikely(msg_version(msg) != TIPC_VERSION))
1081 return 0;
1082
1083 size = msg_size(msg);
1084 hdr_size = msg_hdr_sz(msg);
1085 min_hdr_size = msg_isdata(msg) ?
1086 min_data_hdr_size[msg_type(msg)] : INT_H_SIZE;
1087
1088 if (unlikely((hdr_size < min_hdr_size) ||
1089 (size < hdr_size) ||
1090 (buf->len < size) ||
1091 (size - hdr_size > TIPC_MAX_USER_MSG_SIZE)))
1092 return 0;
1093
1094 return pskb_may_pull(buf, hdr_size);
1095}
1096
Allan Stephensb02b69c2010-08-17 11:00:07 +00001097/**
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001098 * tipc_rcv - process TIPC packets/messages arriving from off-node
Allan Stephensb02b69c2010-08-17 11:00:07 +00001099 * @head: pointer to message buffer chain
Ying Xue7a2f7d12014-04-21 10:55:46 +08001100 * @b_ptr: pointer to bearer message arrived on
Allan Stephensb02b69c2010-08-17 11:00:07 +00001101 *
1102 * Invoked with no locks held. Bearer pointer must point to a valid bearer
1103 * structure (i.e. cannot be NULL), but bearer can be inactive.
1104 */
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001105void tipc_rcv(struct sk_buff *head, struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001106{
Per Lidenb97bf3f2006-01-02 19:04:38 +01001107 while (head) {
David S. Miller6c000552008-09-02 23:38:32 -07001108 struct tipc_node *n_ptr;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001109 struct tipc_link *l_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001110 struct sk_buff *crs;
1111 struct sk_buff *buf = head;
Allan Stephens85035562008-04-15 19:04:54 -07001112 struct tipc_msg *msg;
1113 u32 seq_no;
1114 u32 ackd;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001115 u32 released = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001116
Per Lidenb97bf3f2006-01-02 19:04:38 +01001117 head = head->next;
Erik Hugne732256b2014-01-07 15:51:36 -05001118 buf->next = NULL;
Allan Stephens85035562008-04-15 19:04:54 -07001119
1120 /* Ensure message is well-formed */
Allan Stephens85035562008-04-15 19:04:54 -07001121 if (unlikely(!link_recv_buf_validate(buf)))
Ying Xue3af390e2013-10-30 11:26:57 +08001122 goto discard;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001123
Allan Stephensfe13dda2008-04-15 19:03:23 -07001124 /* Ensure message data is a single contiguous unit */
Allan Stephens5f6d9122011-11-04 13:24:29 -04001125 if (unlikely(skb_linearize(buf)))
Ying Xue3af390e2013-10-30 11:26:57 +08001126 goto discard;
Allan Stephensfe13dda2008-04-15 19:03:23 -07001127
Allan Stephens85035562008-04-15 19:04:54 -07001128 /* Handle arrival of a non-unicast link message */
Allan Stephens85035562008-04-15 19:04:54 -07001129 msg = buf_msg(buf);
1130
Per Lidenb97bf3f2006-01-02 19:04:38 +01001131 if (unlikely(msg_non_seq(msg))) {
Allan Stephens1265a022008-06-04 17:32:35 -07001132 if (msg_user(msg) == LINK_CONFIG)
Ying Xue247f0f32014-02-18 16:06:46 +08001133 tipc_disc_rcv(buf, b_ptr);
Allan Stephens1265a022008-06-04 17:32:35 -07001134 else
Ying Xue247f0f32014-02-18 16:06:46 +08001135 tipc_bclink_rcv(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001136 continue;
1137 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001138
Allan Stephensed33a9c2011-04-05 15:15:04 -04001139 /* Discard unicast link messages destined for another node */
Allan Stephens26008242006-06-25 23:39:31 -07001140 if (unlikely(!msg_short(msg) &&
1141 (msg_destnode(msg) != tipc_own_addr)))
Ying Xue3af390e2013-10-30 11:26:57 +08001142 goto discard;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001143
Allan Stephens5a68d5e2010-08-17 11:00:16 +00001144 /* Locate neighboring node that sent message */
Per Liden4323add2006-01-18 00:38:21 +01001145 n_ptr = tipc_node_find(msg_prevnode(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001146 if (unlikely(!n_ptr))
Ying Xue3af390e2013-10-30 11:26:57 +08001147 goto discard;
Per Liden4323add2006-01-18 00:38:21 +01001148 tipc_node_lock(n_ptr);
Allan Stephens85035562008-04-15 19:04:54 -07001149
Allan Stephens5a68d5e2010-08-17 11:00:16 +00001150 /* Locate unicast link endpoint that should handle message */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001151 l_ptr = n_ptr->links[b_ptr->identity];
Ying Xue3af390e2013-10-30 11:26:57 +08001152 if (unlikely(!l_ptr))
1153 goto unlock_discard;
Allan Stephens85035562008-04-15 19:04:54 -07001154
Allan Stephensb4b56102011-05-27 11:00:51 -04001155 /* Verify that communication with node is currently allowed */
Ying Xueaecb9bb2014-05-08 08:54:39 +08001156 if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) &&
Ying Xue10f465c2014-05-05 08:56:11 +08001157 msg_user(msg) == LINK_PROTOCOL &&
1158 (msg_type(msg) == RESET_MSG ||
1159 msg_type(msg) == ACTIVATE_MSG) &&
1160 !msg_redundant_link(msg))
Ying Xueaecb9bb2014-05-08 08:54:39 +08001161 n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN;
Allan Stephensb4b56102011-05-27 11:00:51 -04001162
Ying Xue10f465c2014-05-05 08:56:11 +08001163 if (tipc_node_blocked(n_ptr))
Ying Xue3af390e2013-10-30 11:26:57 +08001164 goto unlock_discard;
Allan Stephensb4b56102011-05-27 11:00:51 -04001165
Allan Stephens85035562008-04-15 19:04:54 -07001166 /* Validate message sequence number info */
Allan Stephens85035562008-04-15 19:04:54 -07001167 seq_no = msg_seqno(msg);
1168 ackd = msg_ack(msg);
1169
1170 /* Release acked messages */
Ying Xue389dd9b2012-11-16 13:51:30 +08001171 if (n_ptr->bclink.recv_permitted)
Allan Stephens365595912011-10-24 15:26:24 -04001172 tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001173
1174 crs = l_ptr->first_out;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001175 while ((crs != l_ptr->next_out) &&
Allan Stephensf9057302011-10-24 16:03:12 -04001176 less_eq(buf_seqno(crs), ackd)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001177 struct sk_buff *next = crs->next;
Allan Stephens5f6d9122011-11-04 13:24:29 -04001178 kfree_skb(crs);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001179 crs = next;
1180 released++;
1181 }
1182 if (released) {
1183 l_ptr->first_out = crs;
1184 l_ptr->out_queue_size -= released;
1185 }
Allan Stephens85035562008-04-15 19:04:54 -07001186
1187 /* Try sending any messages link endpoint has pending */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001188 if (unlikely(l_ptr->next_out))
Per Liden4323add2006-01-18 00:38:21 +01001189 tipc_link_push_queue(l_ptr);
Jon Paul Maloya5377832014-02-13 17:29:15 -05001190
Jon Paul Maloy50100a52014-08-22 18:09:07 -04001191 if (released && !skb_queue_empty(&l_ptr->waiting_sks)) {
1192 link_prepare_wakeup(l_ptr);
1193 l_ptr->owner->action_flags |= TIPC_WAKEUP_USERS;
1194 }
Jon Paul Maloya5377832014-02-13 17:29:15 -05001195
Jon Paul Maloya5377832014-02-13 17:29:15 -05001196 /* Process the incoming packet */
Ying Xue3af390e2013-10-30 11:26:57 +08001197 if (unlikely(!link_working_working(l_ptr))) {
1198 if (msg_user(msg) == LINK_PROTOCOL) {
Ying Xue247f0f32014-02-18 16:06:46 +08001199 tipc_link_proto_rcv(l_ptr, buf);
Ying Xue3af390e2013-10-30 11:26:57 +08001200 head = link_insert_deferred_queue(l_ptr, head);
Per Liden4323add2006-01-18 00:38:21 +01001201 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001202 continue;
1203 }
Ying Xue3af390e2013-10-30 11:26:57 +08001204
1205 /* Traffic message. Conditionally activate link */
1206 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1207
1208 if (link_working_working(l_ptr)) {
1209 /* Re-insert buffer in front of queue */
1210 buf->next = head;
1211 head = buf;
1212 tipc_node_unlock(n_ptr);
1213 continue;
1214 }
1215 goto unlock_discard;
1216 }
1217
1218 /* Link is now in state WORKING_WORKING */
1219 if (unlikely(seq_no != mod(l_ptr->next_in_no))) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001220 link_handle_out_of_seq_msg(l_ptr, buf);
1221 head = link_insert_deferred_queue(l_ptr, head);
Per Liden4323add2006-01-18 00:38:21 +01001222 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001223 continue;
1224 }
Ying Xue3af390e2013-10-30 11:26:57 +08001225 l_ptr->next_in_no++;
1226 if (unlikely(l_ptr->oldest_deferred_in))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001227 head = link_insert_deferred_queue(l_ptr, head);
Jon Paul Maloya5377832014-02-13 17:29:15 -05001228
Erik Hugne3f53bd82014-07-01 10:22:41 +02001229 if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
1230 l_ptr->stats.sent_acks++;
1231 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
1232 }
1233
Erik Hugne7ae934b2014-07-01 10:22:40 +02001234 if (tipc_link_prepare_input(l_ptr, &buf)) {
Per Liden4323add2006-01-18 00:38:21 +01001235 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001236 continue;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001237 }
Per Liden4323add2006-01-18 00:38:21 +01001238 tipc_node_unlock(n_ptr);
Erik Hugne7ae934b2014-07-01 10:22:40 +02001239 msg = buf_msg(buf);
1240 if (tipc_link_input(l_ptr, buf) != 0)
1241 goto discard;
Ying Xue3af390e2013-10-30 11:26:57 +08001242 continue;
1243unlock_discard:
Ying Xue3af390e2013-10-30 11:26:57 +08001244 tipc_node_unlock(n_ptr);
1245discard:
Allan Stephens5f6d9122011-11-04 13:24:29 -04001246 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001247 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001248}
1249
Ben Hutchings2c530402012-07-10 10:55:09 +00001250/**
Erik Hugne7ae934b2014-07-01 10:22:40 +02001251 * tipc_link_prepare_input - process TIPC link messages
1252 *
1253 * returns nonzero if the message was consumed
1254 *
1255 * Node lock must be held
1256 */
1257static int tipc_link_prepare_input(struct tipc_link *l, struct sk_buff **buf)
1258{
1259 struct tipc_node *n;
1260 struct tipc_msg *msg;
1261 int res = -EINVAL;
1262
1263 n = l->owner;
1264 msg = buf_msg(*buf);
1265 switch (msg_user(msg)) {
1266 case CHANGEOVER_PROTOCOL:
1267 if (tipc_link_tunnel_rcv(n, buf))
1268 res = 0;
1269 break;
1270 case MSG_FRAGMENTER:
1271 l->stats.recv_fragments++;
1272 if (tipc_buf_append(&l->reasm_buf, buf)) {
1273 l->stats.recv_fragmented++;
1274 res = 0;
1275 } else if (!l->reasm_buf) {
1276 tipc_link_reset(l);
1277 }
1278 break;
1279 case MSG_BUNDLER:
1280 l->stats.recv_bundles++;
1281 l->stats.recv_bundled += msg_msgcnt(msg);
1282 res = 0;
1283 break;
1284 case NAME_DISTRIBUTOR:
1285 n->bclink.recv_permitted = true;
1286 res = 0;
1287 break;
1288 case BCAST_PROTOCOL:
1289 tipc_link_sync_rcv(n, *buf);
1290 break;
1291 default:
1292 res = 0;
1293 }
1294 return res;
1295}
1296/**
1297 * tipc_link_input - Deliver message too higher layers
1298 */
1299static int tipc_link_input(struct tipc_link *l, struct sk_buff *buf)
1300{
1301 struct tipc_msg *msg = buf_msg(buf);
1302 int res = 0;
1303
1304 switch (msg_user(msg)) {
1305 case TIPC_LOW_IMPORTANCE:
1306 case TIPC_MEDIUM_IMPORTANCE:
1307 case TIPC_HIGH_IMPORTANCE:
1308 case TIPC_CRITICAL_IMPORTANCE:
1309 case CONN_MANAGER:
1310 tipc_sk_rcv(buf);
1311 break;
1312 case NAME_DISTRIBUTOR:
1313 tipc_named_rcv(buf);
1314 break;
1315 case MSG_BUNDLER:
1316 tipc_link_bundle_rcv(buf);
1317 break;
1318 default:
1319 res = -EINVAL;
1320 }
1321 return res;
1322}
1323
1324/**
Allan Stephens8809b252011-10-25 10:44:35 -04001325 * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue
1326 *
1327 * Returns increase in queue length (i.e. 0 or 1)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001328 */
Allan Stephens8809b252011-10-25 10:44:35 -04001329u32 tipc_link_defer_pkt(struct sk_buff **head, struct sk_buff **tail,
Per Liden4323add2006-01-18 00:38:21 +01001330 struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001331{
Allan Stephens8809b252011-10-25 10:44:35 -04001332 struct sk_buff *queue_buf;
1333 struct sk_buff **prev;
Allan Stephensf9057302011-10-24 16:03:12 -04001334 u32 seq_no = buf_seqno(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001335
1336 buf->next = NULL;
1337
1338 /* Empty queue ? */
1339 if (*head == NULL) {
1340 *head = *tail = buf;
1341 return 1;
1342 }
1343
1344 /* Last ? */
Allan Stephensf9057302011-10-24 16:03:12 -04001345 if (less(buf_seqno(*tail), seq_no)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001346 (*tail)->next = buf;
1347 *tail = buf;
1348 return 1;
1349 }
1350
Allan Stephens8809b252011-10-25 10:44:35 -04001351 /* Locate insertion point in queue, then insert; discard if duplicate */
1352 prev = head;
1353 queue_buf = *head;
1354 for (;;) {
1355 u32 curr_seqno = buf_seqno(queue_buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001356
Allan Stephens8809b252011-10-25 10:44:35 -04001357 if (seq_no == curr_seqno) {
Allan Stephens5f6d9122011-11-04 13:24:29 -04001358 kfree_skb(buf);
Allan Stephens8809b252011-10-25 10:44:35 -04001359 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001360 }
Allan Stephens8809b252011-10-25 10:44:35 -04001361
1362 if (less(seq_no, curr_seqno))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001363 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001364
Allan Stephens8809b252011-10-25 10:44:35 -04001365 prev = &queue_buf->next;
1366 queue_buf = queue_buf->next;
1367 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001368
Allan Stephens8809b252011-10-25 10:44:35 -04001369 buf->next = queue_buf;
1370 *prev = buf;
1371 return 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001372}
1373
Allan Stephens8809b252011-10-25 10:44:35 -04001374/*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001375 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
1376 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001377static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001378 struct sk_buff *buf)
1379{
Allan Stephensf9057302011-10-24 16:03:12 -04001380 u32 seq_no = buf_seqno(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001381
1382 if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
Ying Xue247f0f32014-02-18 16:06:46 +08001383 tipc_link_proto_rcv(l_ptr, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001384 return;
1385 }
1386
Per Lidenb97bf3f2006-01-02 19:04:38 +01001387 /* Record OOS packet arrival (force mismatch on next timeout) */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001388 l_ptr->checkpoint--;
1389
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001390 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001391 * Discard packet if a duplicate; otherwise add it to deferred queue
1392 * and notify peer of gap as per protocol specification
1393 */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001394 if (less(seq_no, mod(l_ptr->next_in_no))) {
1395 l_ptr->stats.duplicates++;
Allan Stephens5f6d9122011-11-04 13:24:29 -04001396 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001397 return;
1398 }
1399
Per Liden4323add2006-01-18 00:38:21 +01001400 if (tipc_link_defer_pkt(&l_ptr->oldest_deferred_in,
1401 &l_ptr->newest_deferred_in, buf)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001402 l_ptr->deferred_inqueue_sz++;
1403 l_ptr->stats.deferred_recv++;
Erik Hugne64380a02014-02-11 11:38:26 +01001404 TIPC_SKB_CB(buf)->deferred = true;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001405 if ((l_ptr->deferred_inqueue_sz % 16) == 1)
Ying Xue247f0f32014-02-18 16:06:46 +08001406 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001407 } else
1408 l_ptr->stats.duplicates++;
1409}
1410
1411/*
1412 * Send protocol message to the other endpoint.
1413 */
Ying Xue247f0f32014-02-18 16:06:46 +08001414void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
1415 u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001416{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001417 struct sk_buff *buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001418 struct tipc_msg *msg = l_ptr->pmsg;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001419 u32 msg_size = sizeof(l_ptr->proto_msg);
Allan Stephens75f0aa42011-02-28 15:30:20 -05001420 int r_flag;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001421
Allan Stephens92d2c902011-10-25 11:20:26 -04001422 /* Discard any previous message that was deferred due to congestion */
Allan Stephens92d2c902011-10-25 11:20:26 -04001423 if (l_ptr->proto_msg_queue) {
Allan Stephens5f6d9122011-11-04 13:24:29 -04001424 kfree_skb(l_ptr->proto_msg_queue);
Allan Stephens92d2c902011-10-25 11:20:26 -04001425 l_ptr->proto_msg_queue = NULL;
1426 }
1427
Ying Xue77a7e072013-12-10 20:45:44 -08001428 /* Don't send protocol message during link changeover */
1429 if (l_ptr->exp_msg_count)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001430 return;
Allan Stephensb4b56102011-05-27 11:00:51 -04001431
1432 /* Abort non-RESET send if communication with node is prohibited */
Ying Xue10f465c2014-05-05 08:56:11 +08001433 if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG))
Allan Stephensb4b56102011-05-27 11:00:51 -04001434 return;
1435
Allan Stephens92d2c902011-10-25 11:20:26 -04001436 /* Create protocol message with "out-of-sequence" sequence number */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001437 msg_set_type(msg, msg_typ);
Ying Xue7a2f7d12014-04-21 10:55:46 +08001438 msg_set_net_plane(msg, l_ptr->net_plane);
Allan Stephens7a54d4a2011-10-27 14:17:53 -04001439 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Per Liden4323add2006-01-18 00:38:21 +01001440 msg_set_last_bcast(msg, tipc_bclink_get_last_sent());
Per Lidenb97bf3f2006-01-02 19:04:38 +01001441
1442 if (msg_typ == STATE_MSG) {
1443 u32 next_sent = mod(l_ptr->next_out_no);
1444
Per Liden4323add2006-01-18 00:38:21 +01001445 if (!tipc_link_is_up(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001446 return;
1447 if (l_ptr->next_out)
Allan Stephensf9057302011-10-24 16:03:12 -04001448 next_sent = buf_seqno(l_ptr->next_out);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001449 msg_set_next_sent(msg, next_sent);
1450 if (l_ptr->oldest_deferred_in) {
Allan Stephensf9057302011-10-24 16:03:12 -04001451 u32 rec = buf_seqno(l_ptr->oldest_deferred_in);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001452 gap = mod(rec - mod(l_ptr->next_in_no));
1453 }
1454 msg_set_seq_gap(msg, gap);
1455 if (gap)
1456 l_ptr->stats.sent_nacks++;
1457 msg_set_link_tolerance(msg, tolerance);
1458 msg_set_linkprio(msg, priority);
1459 msg_set_max_pkt(msg, ack_mtu);
1460 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1461 msg_set_probe(msg, probe_msg != 0);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001462 if (probe_msg) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001463 u32 mtu = l_ptr->max_pkt;
1464
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001465 if ((mtu < l_ptr->max_pkt_target) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01001466 link_working_working(l_ptr) &&
1467 l_ptr->fsm_msg_cnt) {
1468 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001469 if (l_ptr->max_pkt_probes == 10) {
1470 l_ptr->max_pkt_target = (msg_size - 4);
1471 l_ptr->max_pkt_probes = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001472 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001473 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001474 l_ptr->max_pkt_probes++;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001475 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001476
1477 l_ptr->stats.sent_probes++;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001478 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001479 l_ptr->stats.sent_states++;
1480 } else { /* RESET_MSG or ACTIVATE_MSG */
1481 msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1));
1482 msg_set_seq_gap(msg, 0);
1483 msg_set_next_sent(msg, 1);
Allan Stephensf23d9bf2011-01-18 15:15:34 -05001484 msg_set_probe(msg, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001485 msg_set_link_tolerance(msg, l_ptr->tolerance);
1486 msg_set_linkprio(msg, l_ptr->priority);
1487 msg_set_max_pkt(msg, l_ptr->max_pkt_target);
1488 }
1489
Allan Stephens75f0aa42011-02-28 15:30:20 -05001490 r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr));
1491 msg_set_redundant_link(msg, r_flag);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001492 msg_set_linkprio(msg, l_ptr->priority);
Allan Stephens92d2c902011-10-25 11:20:26 -04001493 msg_set_size(msg, msg_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001494
1495 msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
1496
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001497 buf = tipc_buf_acquire(msg_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001498 if (!buf)
1499 return;
1500
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001501 skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
Ying Xue796c75d2013-06-17 10:54:48 -04001502 buf->priority = TC_PRIO_CONTROL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001503
Ying Xue7a2f7d12014-04-21 10:55:46 +08001504 tipc_bearer_send(l_ptr->bearer_id, buf, &l_ptr->media_addr);
Allan Stephens92d2c902011-10-25 11:20:26 -04001505 l_ptr->unacked_window = 0;
Allan Stephens5f6d9122011-11-04 13:24:29 -04001506 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001507}
1508
1509/*
1510 * Receive protocol message :
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001511 * Note that network plane id propagates through the network, and may
1512 * change at any time. The node with lowest address rules
Per Lidenb97bf3f2006-01-02 19:04:38 +01001513 */
Ying Xue247f0f32014-02-18 16:06:46 +08001514static void tipc_link_proto_rcv(struct tipc_link *l_ptr, struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001515{
1516 u32 rec_gap = 0;
1517 u32 max_pkt_info;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001518 u32 max_pkt_ack;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001519 u32 msg_tol;
1520 struct tipc_msg *msg = buf_msg(buf);
1521
Ying Xue77a7e072013-12-10 20:45:44 -08001522 /* Discard protocol message during link changeover */
1523 if (l_ptr->exp_msg_count)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001524 goto exit;
1525
Ying Xue7a2f7d12014-04-21 10:55:46 +08001526 if (l_ptr->net_plane != msg_net_plane(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001527 if (tipc_own_addr > msg_prevnode(msg))
Ying Xue7a2f7d12014-04-21 10:55:46 +08001528 l_ptr->net_plane = msg_net_plane(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001529
Per Lidenb97bf3f2006-01-02 19:04:38 +01001530 switch (msg_type(msg)) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001531
Per Lidenb97bf3f2006-01-02 19:04:38 +01001532 case RESET_MSG:
Allan Stephensa686e682008-06-04 17:29:39 -07001533 if (!link_working_unknown(l_ptr) &&
1534 (l_ptr->peer_session != INVALID_SESSION)) {
Allan Stephens641c2182011-04-07 09:54:43 -04001535 if (less_eq(msg_session(msg), l_ptr->peer_session))
1536 break; /* duplicate or old reset: ignore */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001537 }
Allan Stephensb4b56102011-05-27 11:00:51 -04001538
1539 if (!msg_redundant_link(msg) && (link_working_working(l_ptr) ||
1540 link_working_unknown(l_ptr))) {
1541 /*
1542 * peer has lost contact -- don't allow peer's links
1543 * to reactivate before we recognize loss & clean up
1544 */
Ying Xueca9cf062014-05-08 08:54:40 +08001545 l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN;
Allan Stephensb4b56102011-05-27 11:00:51 -04001546 }
1547
Allan Stephens47361c82011-10-26 10:55:16 -04001548 link_state_event(l_ptr, RESET_MSG);
1549
Per Lidenb97bf3f2006-01-02 19:04:38 +01001550 /* fall thru' */
1551 case ACTIVATE_MSG:
1552 /* Update link settings according other endpoint's values */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001553 strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
1554
Allan Stephens2db99832010-12-31 18:59:33 +00001555 msg_tol = msg_link_tolerance(msg);
1556 if (msg_tol > l_ptr->tolerance)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001557 link_set_supervision_props(l_ptr, msg_tol);
1558
1559 if (msg_linkprio(msg) > l_ptr->priority)
1560 l_ptr->priority = msg_linkprio(msg);
1561
1562 max_pkt_info = msg_max_pkt(msg);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001563 if (max_pkt_info) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001564 if (max_pkt_info < l_ptr->max_pkt_target)
1565 l_ptr->max_pkt_target = max_pkt_info;
1566 if (l_ptr->max_pkt > l_ptr->max_pkt_target)
1567 l_ptr->max_pkt = l_ptr->max_pkt_target;
1568 } else {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001569 l_ptr->max_pkt = l_ptr->max_pkt_target;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001570 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001571
Allan Stephens4d753132011-10-25 12:19:05 -04001572 /* Synchronize broadcast link info, if not done previously */
Allan Stephens7a54d4a2011-10-27 14:17:53 -04001573 if (!tipc_node_is_up(l_ptr->owner)) {
1574 l_ptr->owner->bclink.last_sent =
1575 l_ptr->owner->bclink.last_in =
1576 msg_last_bcast(msg);
1577 l_ptr->owner->bclink.oos_state = 0;
1578 }
Allan Stephens4d753132011-10-25 12:19:05 -04001579
Per Lidenb97bf3f2006-01-02 19:04:38 +01001580 l_ptr->peer_session = msg_session(msg);
1581 l_ptr->peer_bearer_id = msg_bearer_id(msg);
Allan Stephens47361c82011-10-26 10:55:16 -04001582
1583 if (msg_type(msg) == ACTIVATE_MSG)
1584 link_state_event(l_ptr, ACTIVATE_MSG);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001585 break;
1586 case STATE_MSG:
1587
Allan Stephens2db99832010-12-31 18:59:33 +00001588 msg_tol = msg_link_tolerance(msg);
1589 if (msg_tol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001590 link_set_supervision_props(l_ptr, msg_tol);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001591
1592 if (msg_linkprio(msg) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01001593 (msg_linkprio(msg) != l_ptr->priority)) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04001594 pr_warn("%s<%s>, priority change %u->%u\n",
1595 link_rst_msg, l_ptr->name, l_ptr->priority,
1596 msg_linkprio(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001597 l_ptr->priority = msg_linkprio(msg);
Per Liden4323add2006-01-18 00:38:21 +01001598 tipc_link_reset(l_ptr); /* Enforce change to take effect */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001599 break;
1600 }
Jon Paul Maloyec37dcd2014-05-14 05:39:10 -04001601
1602 /* Record reception; force mismatch at next timeout: */
1603 l_ptr->checkpoint--;
1604
Per Lidenb97bf3f2006-01-02 19:04:38 +01001605 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1606 l_ptr->stats.recv_states++;
1607 if (link_reset_unknown(l_ptr))
1608 break;
1609
1610 if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001611 rec_gap = mod(msg_next_sent(msg) -
Per Lidenb97bf3f2006-01-02 19:04:38 +01001612 mod(l_ptr->next_in_no));
1613 }
1614
1615 max_pkt_ack = msg_max_pkt(msg);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001616 if (max_pkt_ack > l_ptr->max_pkt) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001617 l_ptr->max_pkt = max_pkt_ack;
1618 l_ptr->max_pkt_probes = 0;
1619 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001620
1621 max_pkt_ack = 0;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001622 if (msg_probe(msg)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001623 l_ptr->stats.recv_probes++;
Allan Stephensa0168922010-12-31 18:59:35 +00001624 if (msg_size(msg) > sizeof(l_ptr->proto_msg))
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001625 max_pkt_ack = msg_size(msg);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001626 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001627
1628 /* Protocol message before retransmits, reduce loss risk */
Ying Xue389dd9b2012-11-16 13:51:30 +08001629 if (l_ptr->owner->bclink.recv_permitted)
Allan Stephens7a54d4a2011-10-27 14:17:53 -04001630 tipc_bclink_update_link_state(l_ptr->owner,
1631 msg_last_bcast(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001632
1633 if (rec_gap || (msg_probe(msg))) {
Ying Xue247f0f32014-02-18 16:06:46 +08001634 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, rec_gap, 0,
1635 0, max_pkt_ack);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001636 }
1637 if (msg_seq_gap(msg)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001638 l_ptr->stats.recv_nacks++;
Per Liden4323add2006-01-18 00:38:21 +01001639 tipc_link_retransmit(l_ptr, l_ptr->first_out,
1640 msg_seq_gap(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001641 }
1642 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001643 }
1644exit:
Allan Stephens5f6d9122011-11-04 13:24:29 -04001645 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001646}
1647
1648
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001649/* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to
1650 * a different bearer. Owner node is locked.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001651 */
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001652static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr,
1653 struct tipc_msg *tunnel_hdr,
1654 struct tipc_msg *msg,
1655 u32 selector)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001656{
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001657 struct tipc_link *tunnel;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001658 struct sk_buff *buf;
1659 u32 length = msg_size(msg);
1660
1661 tunnel = l_ptr->owner->active_links[selector & 1];
Allan Stephens5392d642006-06-25 23:52:50 -07001662 if (!tipc_link_is_up(tunnel)) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04001663 pr_warn("%stunnel link no longer available\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001664 return;
Allan Stephens5392d642006-06-25 23:52:50 -07001665 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001666 msg_set_size(tunnel_hdr, length + INT_H_SIZE);
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001667 buf = tipc_buf_acquire(length + INT_H_SIZE);
Allan Stephens5392d642006-06-25 23:52:50 -07001668 if (!buf) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04001669 pr_warn("%sunable to send tunnel msg\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001670 return;
Allan Stephens5392d642006-06-25 23:52:50 -07001671 }
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001672 skb_copy_to_linear_data(buf, tunnel_hdr, INT_H_SIZE);
1673 skb_copy_to_linear_data_offset(buf, INT_H_SIZE, msg, length);
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -04001674 __tipc_link_xmit(tunnel, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001675}
1676
1677
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001678/* tipc_link_failover_send_queue(): A link has gone down, but a second
1679 * link is still active. We can do failover. Tunnel the failing link's
1680 * whole send queue via the remaining link. This way, we don't lose
1681 * any packets, and sequence order is preserved for subsequent traffic
1682 * sent over the remaining link. Owner node is locked.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001683 */
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001684void tipc_link_failover_send_queue(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001685{
1686 u32 msgcount = l_ptr->out_queue_size;
1687 struct sk_buff *crs = l_ptr->first_out;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001688 struct tipc_link *tunnel = l_ptr->owner->active_links[0];
Per Lidenb97bf3f2006-01-02 19:04:38 +01001689 struct tipc_msg tunnel_hdr;
Allan Stephens5392d642006-06-25 23:52:50 -07001690 int split_bundles;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001691
1692 if (!tunnel)
1693 return;
1694
Allan Stephensc68ca7b2010-05-11 14:30:12 +00001695 tipc_msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
Allan Stephens75715212008-06-04 17:37:34 -07001696 ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001697 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
1698 msg_set_msgcnt(&tunnel_hdr, msgcount);
Allan Stephensf1310722006-06-25 23:51:37 -07001699
Per Lidenb97bf3f2006-01-02 19:04:38 +01001700 if (!l_ptr->first_out) {
1701 struct sk_buff *buf;
1702
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001703 buf = tipc_buf_acquire(INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001704 if (buf) {
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001705 skb_copy_to_linear_data(buf, &tunnel_hdr, INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001706 msg_set_size(&tunnel_hdr, INT_H_SIZE);
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -04001707 __tipc_link_xmit(tunnel, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001708 } else {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04001709 pr_warn("%sunable to send changeover msg\n",
1710 link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001711 }
1712 return;
1713 }
Allan Stephensf1310722006-06-25 23:51:37 -07001714
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001715 split_bundles = (l_ptr->owner->active_links[0] !=
Allan Stephens5392d642006-06-25 23:52:50 -07001716 l_ptr->owner->active_links[1]);
1717
Per Lidenb97bf3f2006-01-02 19:04:38 +01001718 while (crs) {
1719 struct tipc_msg *msg = buf_msg(crs);
1720
1721 if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001722 struct tipc_msg *m = msg_get_wrapped(msg);
Allan Stephens0e659672010-12-31 18:59:32 +00001723 unchar *pos = (unchar *)m;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001724
Florian Westphald788d802007-08-02 19:28:06 -07001725 msgcount = msg_msgcnt(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001726 while (msgcount--) {
Allan Stephens0e659672010-12-31 18:59:32 +00001727 msg_set_seqno(m, msg_seqno(msg));
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001728 tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m,
1729 msg_link_selector(m));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001730 pos += align(msg_size(m));
1731 m = (struct tipc_msg *)pos;
1732 }
1733 } else {
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001734 tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg,
1735 msg_link_selector(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001736 }
1737 crs = crs->next;
1738 }
1739}
1740
Ying Xue247f0f32014-02-18 16:06:46 +08001741/* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001742 * duplicate of the first link's send queue via the new link. This way, we
1743 * are guaranteed that currently queued packets from a socket are delivered
1744 * before future traffic from the same socket, even if this is using the
1745 * new link. The last arriving copy of each duplicate packet is dropped at
1746 * the receiving end by the regular protocol check, so packet cardinality
1747 * and sequence order is preserved per sender/receiver socket pair.
1748 * Owner node is locked.
1749 */
Ying Xue247f0f32014-02-18 16:06:46 +08001750void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr,
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001751 struct tipc_link *tunnel)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001752{
1753 struct sk_buff *iter;
1754 struct tipc_msg tunnel_hdr;
1755
Allan Stephensc68ca7b2010-05-11 14:30:12 +00001756 tipc_msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
Allan Stephens75715212008-06-04 17:37:34 -07001757 DUPLICATE_MSG, INT_H_SIZE, l_ptr->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001758 msg_set_msgcnt(&tunnel_hdr, l_ptr->out_queue_size);
1759 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
1760 iter = l_ptr->first_out;
1761 while (iter) {
1762 struct sk_buff *outbuf;
1763 struct tipc_msg *msg = buf_msg(iter);
1764 u32 length = msg_size(msg);
1765
1766 if (msg_user(msg) == MSG_BUNDLER)
1767 msg_set_type(msg, CLOSED_MSG);
1768 msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001769 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001770 msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001771 outbuf = tipc_buf_acquire(length + INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001772 if (outbuf == NULL) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04001773 pr_warn("%sunable to send duplicate msg\n",
1774 link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001775 return;
1776 }
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001777 skb_copy_to_linear_data(outbuf, &tunnel_hdr, INT_H_SIZE);
1778 skb_copy_to_linear_data_offset(outbuf, INT_H_SIZE, iter->data,
1779 length);
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -04001780 __tipc_link_xmit(tunnel, outbuf);
Per Liden4323add2006-01-18 00:38:21 +01001781 if (!tipc_link_is_up(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001782 return;
1783 iter = iter->next;
1784 }
1785}
1786
Per Lidenb97bf3f2006-01-02 19:04:38 +01001787/**
1788 * buf_extract - extracts embedded TIPC message from another message
1789 * @skb: encapsulating message buffer
1790 * @from_pos: offset to extract from
1791 *
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001792 * Returns a new message buffer containing an embedded message. The
Per Lidenb97bf3f2006-01-02 19:04:38 +01001793 * encapsulating message itself is left unchanged.
1794 */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001795static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)
1796{
1797 struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos);
1798 u32 size = msg_size(msg);
1799 struct sk_buff *eb;
1800
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001801 eb = tipc_buf_acquire(size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001802 if (eb)
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001803 skb_copy_to_linear_data(eb, msg, size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001804 return eb;
1805}
1806
Jon Paul Maloy1dab3d52014-02-13 17:29:10 -05001807
1808
1809/* tipc_link_dup_rcv(): Receive a tunnelled DUPLICATE_MSG packet.
1810 * Owner node is locked.
1811 */
1812static void tipc_link_dup_rcv(struct tipc_link *l_ptr,
1813 struct sk_buff *t_buf)
1814{
1815 struct sk_buff *buf;
1816
1817 if (!tipc_link_is_up(l_ptr))
1818 return;
1819
1820 buf = buf_extract(t_buf, INT_H_SIZE);
1821 if (buf == NULL) {
1822 pr_warn("%sfailed to extract inner dup pkt\n", link_co_err);
1823 return;
1824 }
1825
1826 /* Add buffer to deferred queue, if applicable: */
1827 link_handle_out_of_seq_msg(l_ptr, buf);
1828}
1829
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001830/* tipc_link_failover_rcv(): Receive a tunnelled ORIGINAL_MSG packet
1831 * Owner node is locked.
1832 */
1833static struct sk_buff *tipc_link_failover_rcv(struct tipc_link *l_ptr,
1834 struct sk_buff *t_buf)
1835{
1836 struct tipc_msg *t_msg = buf_msg(t_buf);
1837 struct sk_buff *buf = NULL;
1838 struct tipc_msg *msg;
1839
1840 if (tipc_link_is_up(l_ptr))
1841 tipc_link_reset(l_ptr);
1842
1843 /* First failover packet? */
1844 if (l_ptr->exp_msg_count == START_CHANGEOVER)
1845 l_ptr->exp_msg_count = msg_msgcnt(t_msg);
1846
1847 /* Should there be an inner packet? */
1848 if (l_ptr->exp_msg_count) {
1849 l_ptr->exp_msg_count--;
1850 buf = buf_extract(t_buf, INT_H_SIZE);
1851 if (buf == NULL) {
1852 pr_warn("%sno inner failover pkt\n", link_co_err);
1853 goto exit;
1854 }
1855 msg = buf_msg(buf);
1856
1857 if (less(msg_seqno(msg), l_ptr->reset_checkpoint)) {
1858 kfree_skb(buf);
1859 buf = NULL;
1860 goto exit;
1861 }
1862 if (msg_user(msg) == MSG_FRAGMENTER) {
1863 l_ptr->stats.recv_fragments++;
Jon Paul Maloy37e22162014-05-14 05:39:12 -04001864 tipc_buf_append(&l_ptr->reasm_buf, &buf);
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001865 }
1866 }
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001867exit:
Jon Paul Maloy7d339392014-02-13 17:29:16 -05001868 if ((l_ptr->exp_msg_count == 0) && (l_ptr->flags & LINK_STOPPED)) {
1869 tipc_node_detach_link(l_ptr->owner, l_ptr);
1870 kfree(l_ptr);
1871 }
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001872 return buf;
1873}
1874
Jon Paul Maloy1dab3d52014-02-13 17:29:10 -05001875/* tipc_link_tunnel_rcv(): Receive a tunnelled packet, sent
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001876 * via other link as result of a failover (ORIGINAL_MSG) or
1877 * a new active link (DUPLICATE_MSG). Failover packets are
1878 * returned to the active link for delivery upwards.
1879 * Owner node is locked.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001880 */
Jon Paul Maloy3bb53382014-02-13 17:29:12 -05001881static int tipc_link_tunnel_rcv(struct tipc_node *n_ptr,
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001882 struct sk_buff **buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001883{
Jon Paul Maloy02842f72014-02-13 17:29:14 -05001884 struct sk_buff *t_buf = *buf;
1885 struct tipc_link *l_ptr;
1886 struct tipc_msg *t_msg = buf_msg(t_buf);
1887 u32 bearer_id = msg_bearer_id(t_msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001888
Jon Paul Maloy1e9d47a2014-02-13 17:29:13 -05001889 *buf = NULL;
1890
Dan Carpentercb4b102f2013-05-06 08:28:41 +00001891 if (bearer_id >= MAX_BEARERS)
1892 goto exit;
Jon Paul Maloy1dab3d52014-02-13 17:29:10 -05001893
Jon Paul Maloy02842f72014-02-13 17:29:14 -05001894 l_ptr = n_ptr->links[bearer_id];
1895 if (!l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001896 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001897
Jon Paul Maloy02842f72014-02-13 17:29:14 -05001898 if (msg_type(t_msg) == DUPLICATE_MSG)
1899 tipc_link_dup_rcv(l_ptr, t_buf);
1900 else if (msg_type(t_msg) == ORIGINAL_MSG)
1901 *buf = tipc_link_failover_rcv(l_ptr, t_buf);
Jon Paul Maloy1e9d47a2014-02-13 17:29:13 -05001902 else
1903 pr_warn("%sunknown tunnel pkt received\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001904exit:
Jon Paul Maloy02842f72014-02-13 17:29:14 -05001905 kfree_skb(t_buf);
Jon Paul Maloy1e9d47a2014-02-13 17:29:13 -05001906 return *buf != NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001907}
1908
1909/*
1910 * Bundler functionality:
1911 */
Ying Xue247f0f32014-02-18 16:06:46 +08001912void tipc_link_bundle_rcv(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001913{
1914 u32 msgcount = msg_msgcnt(buf_msg(buf));
1915 u32 pos = INT_H_SIZE;
1916 struct sk_buff *obuf;
Jon Paul Maloyec8a2e52014-06-25 20:41:40 -05001917 struct tipc_msg *omsg;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001918
Per Lidenb97bf3f2006-01-02 19:04:38 +01001919 while (msgcount--) {
1920 obuf = buf_extract(buf, pos);
1921 if (obuf == NULL) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04001922 pr_warn("Link unable to unbundle message(s)\n");
Allan Stephensa10bd922006-06-25 23:52:17 -07001923 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001924 }
Jon Paul Maloyec8a2e52014-06-25 20:41:40 -05001925 omsg = buf_msg(obuf);
1926 pos += align(msg_size(omsg));
Jon Paul Maloy643566d2014-10-17 15:25:28 -04001927 if (msg_isdata(omsg)) {
1928 if (unlikely(msg_type(omsg) == TIPC_MCAST_MSG))
1929 tipc_sk_mcast_rcv(obuf);
1930 else
1931 tipc_sk_rcv(obuf);
1932 } else if (msg_user(omsg) == CONN_MANAGER) {
Jon Paul Maloyec8a2e52014-06-25 20:41:40 -05001933 tipc_sk_rcv(obuf);
1934 } else if (msg_user(omsg) == NAME_DISTRIBUTOR) {
1935 tipc_named_rcv(obuf);
1936 } else {
1937 pr_warn("Illegal bundled msg: %u\n", msg_user(omsg));
1938 kfree_skb(obuf);
1939 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001940 }
Allan Stephens5f6d9122011-11-04 13:24:29 -04001941 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001942}
1943
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001944static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tolerance)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001945{
Allan Stephens5413b4c2011-01-18 13:24:55 -05001946 if ((tolerance < TIPC_MIN_LINK_TOL) || (tolerance > TIPC_MAX_LINK_TOL))
1947 return;
1948
Per Lidenb97bf3f2006-01-02 19:04:38 +01001949 l_ptr->tolerance = tolerance;
1950 l_ptr->continuity_interval =
1951 ((tolerance / 4) > 500) ? 500 : tolerance / 4;
1952 l_ptr->abort_limit = tolerance / (l_ptr->continuity_interval / 4);
1953}
1954
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001955void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001956{
1957 /* Data messages from this node, inclusive FIRST_FRAGM */
Allan Stephens06d82c92008-03-06 15:06:55 -08001958 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE] = window;
1959 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE] = (window / 3) * 4;
1960 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE] = (window / 3) * 5;
1961 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE] = (window / 3) * 6;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001962 /* Transiting data messages,inclusive FIRST_FRAGM */
Allan Stephens06d82c92008-03-06 15:06:55 -08001963 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE + 4] = 300;
1964 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE + 4] = 600;
1965 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE + 4] = 900;
1966 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE + 4] = 1200;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001967 l_ptr->queue_limit[CONN_MANAGER] = 1200;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001968 l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;
1969 l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000;
1970 /* FRAGMENT and LAST_FRAGMENT packets */
1971 l_ptr->queue_limit[MSG_FRAGMENTER] = 4000;
1972}
1973
Jon Paul Maloye099e862014-02-13 17:29:18 -05001974/* tipc_link_find_owner - locate owner node of link by link's name
1975 * @name: pointer to link name string
1976 * @bearer_id: pointer to index in 'node->links' array where the link was found.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001977 *
Jon Paul Maloye099e862014-02-13 17:29:18 -05001978 * Returns pointer to node owning the link, or 0 if no matching link is found.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001979 */
Jon Paul Maloye099e862014-02-13 17:29:18 -05001980static struct tipc_node *tipc_link_find_owner(const char *link_name,
1981 unsigned int *bearer_id)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001982{
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001983 struct tipc_link *l_ptr;
Erik Hugnebbfbe472013-10-18 07:23:21 +02001984 struct tipc_node *n_ptr;
Jon Paul Maloye099e862014-02-13 17:29:18 -05001985 struct tipc_node *found_node = 0;
Erik Hugnebbfbe472013-10-18 07:23:21 +02001986 int i;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001987
Jon Paul Maloye099e862014-02-13 17:29:18 -05001988 *bearer_id = 0;
Ying Xue6c7a7622014-03-27 12:54:37 +08001989 rcu_read_lock();
1990 list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
Jon Paul Maloya11607f2014-02-14 16:40:44 -05001991 tipc_node_lock(n_ptr);
Erik Hugnebbfbe472013-10-18 07:23:21 +02001992 for (i = 0; i < MAX_BEARERS; i++) {
1993 l_ptr = n_ptr->links[i];
Jon Paul Maloye099e862014-02-13 17:29:18 -05001994 if (l_ptr && !strcmp(l_ptr->name, link_name)) {
1995 *bearer_id = i;
1996 found_node = n_ptr;
1997 break;
1998 }
Erik Hugnebbfbe472013-10-18 07:23:21 +02001999 }
Jon Paul Maloya11607f2014-02-14 16:40:44 -05002000 tipc_node_unlock(n_ptr);
Jon Paul Maloye099e862014-02-13 17:29:18 -05002001 if (found_node)
2002 break;
Erik Hugnebbfbe472013-10-18 07:23:21 +02002003 }
Ying Xue6c7a7622014-03-27 12:54:37 +08002004 rcu_read_unlock();
2005
Jon Paul Maloye099e862014-02-13 17:29:18 -05002006 return found_node;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002007}
2008
Allan Stephens5c216e12011-10-18 11:34:29 -04002009/**
2010 * link_value_is_valid -- validate proposed link tolerance/priority/window
2011 *
Ben Hutchings2c530402012-07-10 10:55:09 +00002012 * @cmd: value type (TIPC_CMD_SET_LINK_*)
2013 * @new_value: the new value
Allan Stephens5c216e12011-10-18 11:34:29 -04002014 *
2015 * Returns 1 if value is within range, 0 if not.
2016 */
Allan Stephens5c216e12011-10-18 11:34:29 -04002017static int link_value_is_valid(u16 cmd, u32 new_value)
2018{
2019 switch (cmd) {
2020 case TIPC_CMD_SET_LINK_TOL:
2021 return (new_value >= TIPC_MIN_LINK_TOL) &&
2022 (new_value <= TIPC_MAX_LINK_TOL);
2023 case TIPC_CMD_SET_LINK_PRI:
2024 return (new_value <= TIPC_MAX_LINK_PRI);
2025 case TIPC_CMD_SET_LINK_WINDOW:
2026 return (new_value >= TIPC_MIN_LINK_WIN) &&
2027 (new_value <= TIPC_MAX_LINK_WIN);
2028 }
2029 return 0;
2030}
2031
Allan Stephens5c216e12011-10-18 11:34:29 -04002032/**
2033 * link_cmd_set_value - change priority/tolerance/window for link/bearer/media
Ben Hutchings2c530402012-07-10 10:55:09 +00002034 * @name: ptr to link, bearer, or media name
2035 * @new_value: new value of link, bearer, or media setting
2036 * @cmd: which link, bearer, or media attribute to set (TIPC_CMD_SET_LINK_*)
Allan Stephens5c216e12011-10-18 11:34:29 -04002037 *
Ying Xue7216cd92014-04-21 10:55:48 +08002038 * Caller must hold RTNL lock to ensure link/bearer/media is not deleted.
Allan Stephens5c216e12011-10-18 11:34:29 -04002039 *
2040 * Returns 0 if value updated and negative value on error.
2041 */
Allan Stephens5c216e12011-10-18 11:34:29 -04002042static int link_cmd_set_value(const char *name, u32 new_value, u16 cmd)
2043{
2044 struct tipc_node *node;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05002045 struct tipc_link *l_ptr;
Allan Stephens5c216e12011-10-18 11:34:29 -04002046 struct tipc_bearer *b_ptr;
Paul Gortmaker358a0d12011-12-29 20:19:42 -05002047 struct tipc_media *m_ptr;
Jon Paul Maloye099e862014-02-13 17:29:18 -05002048 int bearer_id;
Ying Xue636c0372013-10-18 07:23:20 +02002049 int res = 0;
Allan Stephens5c216e12011-10-18 11:34:29 -04002050
Jon Paul Maloye099e862014-02-13 17:29:18 -05002051 node = tipc_link_find_owner(name, &bearer_id);
2052 if (node) {
Allan Stephens5c216e12011-10-18 11:34:29 -04002053 tipc_node_lock(node);
Jon Paul Maloye099e862014-02-13 17:29:18 -05002054 l_ptr = node->links[bearer_id];
2055
2056 if (l_ptr) {
2057 switch (cmd) {
2058 case TIPC_CMD_SET_LINK_TOL:
2059 link_set_supervision_props(l_ptr, new_value);
Ying Xue247f0f32014-02-18 16:06:46 +08002060 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0,
2061 new_value, 0, 0);
Jon Paul Maloye099e862014-02-13 17:29:18 -05002062 break;
2063 case TIPC_CMD_SET_LINK_PRI:
2064 l_ptr->priority = new_value;
Ying Xue247f0f32014-02-18 16:06:46 +08002065 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0,
2066 0, new_value, 0);
Jon Paul Maloye099e862014-02-13 17:29:18 -05002067 break;
2068 case TIPC_CMD_SET_LINK_WINDOW:
2069 tipc_link_set_queue_limits(l_ptr, new_value);
2070 break;
2071 default:
2072 res = -EINVAL;
2073 break;
2074 }
Allan Stephens5c216e12011-10-18 11:34:29 -04002075 }
2076 tipc_node_unlock(node);
Ying Xue636c0372013-10-18 07:23:20 +02002077 return res;
Allan Stephens5c216e12011-10-18 11:34:29 -04002078 }
2079
2080 b_ptr = tipc_bearer_find(name);
2081 if (b_ptr) {
2082 switch (cmd) {
2083 case TIPC_CMD_SET_LINK_TOL:
2084 b_ptr->tolerance = new_value;
Ying Xue636c0372013-10-18 07:23:20 +02002085 break;
Allan Stephens5c216e12011-10-18 11:34:29 -04002086 case TIPC_CMD_SET_LINK_PRI:
2087 b_ptr->priority = new_value;
Ying Xue636c0372013-10-18 07:23:20 +02002088 break;
Allan Stephens5c216e12011-10-18 11:34:29 -04002089 case TIPC_CMD_SET_LINK_WINDOW:
2090 b_ptr->window = new_value;
Ying Xue636c0372013-10-18 07:23:20 +02002091 break;
2092 default:
2093 res = -EINVAL;
2094 break;
Allan Stephens5c216e12011-10-18 11:34:29 -04002095 }
Ying Xue636c0372013-10-18 07:23:20 +02002096 return res;
Allan Stephens5c216e12011-10-18 11:34:29 -04002097 }
2098
2099 m_ptr = tipc_media_find(name);
2100 if (!m_ptr)
2101 return -ENODEV;
2102 switch (cmd) {
2103 case TIPC_CMD_SET_LINK_TOL:
2104 m_ptr->tolerance = new_value;
Ying Xue636c0372013-10-18 07:23:20 +02002105 break;
Allan Stephens5c216e12011-10-18 11:34:29 -04002106 case TIPC_CMD_SET_LINK_PRI:
2107 m_ptr->priority = new_value;
Ying Xue636c0372013-10-18 07:23:20 +02002108 break;
Allan Stephens5c216e12011-10-18 11:34:29 -04002109 case TIPC_CMD_SET_LINK_WINDOW:
2110 m_ptr->window = new_value;
Ying Xue636c0372013-10-18 07:23:20 +02002111 break;
2112 default:
2113 res = -EINVAL;
2114 break;
Allan Stephens5c216e12011-10-18 11:34:29 -04002115 }
Ying Xue636c0372013-10-18 07:23:20 +02002116 return res;
Allan Stephens5c216e12011-10-18 11:34:29 -04002117}
2118
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002119struct sk_buff *tipc_link_cmd_config(const void *req_tlv_area, int req_tlv_space,
Per Liden4323add2006-01-18 00:38:21 +01002120 u16 cmd)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002121{
2122 struct tipc_link_config *args;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002123 u32 new_value;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002124 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002125
2126 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG))
Per Liden4323add2006-01-18 00:38:21 +01002127 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002128
2129 args = (struct tipc_link_config *)TLV_DATA(req_tlv_area);
2130 new_value = ntohl(args->value);
2131
Allan Stephens5c216e12011-10-18 11:34:29 -04002132 if (!link_value_is_valid(cmd, new_value))
2133 return tipc_cfg_reply_error_string(
2134 "cannot change, value invalid");
2135
Per Liden4323add2006-01-18 00:38:21 +01002136 if (!strcmp(args->name, tipc_bclink_name)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002137 if ((cmd == TIPC_CMD_SET_LINK_WINDOW) &&
Per Liden4323add2006-01-18 00:38:21 +01002138 (tipc_bclink_set_queue_limits(new_value) == 0))
2139 return tipc_cfg_reply_none();
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002140 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
Per Liden4323add2006-01-18 00:38:21 +01002141 " (cannot change setting on broadcast link)");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002142 }
2143
Allan Stephens5c216e12011-10-18 11:34:29 -04002144 res = link_cmd_set_value(args->name, new_value, cmd);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002145 if (res)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002146 return tipc_cfg_reply_error_string("cannot change link setting");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002147
Per Liden4323add2006-01-18 00:38:21 +01002148 return tipc_cfg_reply_none();
Per Lidenb97bf3f2006-01-02 19:04:38 +01002149}
2150
2151/**
2152 * link_reset_statistics - reset link statistics
2153 * @l_ptr: pointer to link
2154 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05002155static void link_reset_statistics(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002156{
2157 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
2158 l_ptr->stats.sent_info = l_ptr->next_out_no;
2159 l_ptr->stats.recv_info = l_ptr->next_in_no;
2160}
2161
Per Liden4323add2006-01-18 00:38:21 +01002162struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002163{
2164 char *link_name;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05002165 struct tipc_link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -07002166 struct tipc_node *node;
Jon Paul Maloye099e862014-02-13 17:29:18 -05002167 unsigned int bearer_id;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002168
2169 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
Per Liden4323add2006-01-18 00:38:21 +01002170 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002171
2172 link_name = (char *)TLV_DATA(req_tlv_area);
Per Liden4323add2006-01-18 00:38:21 +01002173 if (!strcmp(link_name, tipc_bclink_name)) {
2174 if (tipc_bclink_reset_stats())
2175 return tipc_cfg_reply_error_string("link not found");
2176 return tipc_cfg_reply_none();
Per Lidenb97bf3f2006-01-02 19:04:38 +01002177 }
Jon Paul Maloye099e862014-02-13 17:29:18 -05002178 node = tipc_link_find_owner(link_name, &bearer_id);
Ying Xue7216cd92014-04-21 10:55:48 +08002179 if (!node)
Per Liden4323add2006-01-18 00:38:21 +01002180 return tipc_cfg_reply_error_string("link not found");
Ying Xue7216cd92014-04-21 10:55:48 +08002181
Jon Paul Maloya11607f2014-02-14 16:40:44 -05002182 tipc_node_lock(node);
Jon Paul Maloye099e862014-02-13 17:29:18 -05002183 l_ptr = node->links[bearer_id];
2184 if (!l_ptr) {
2185 tipc_node_unlock(node);
Jon Paul Maloye099e862014-02-13 17:29:18 -05002186 return tipc_cfg_reply_error_string("link not found");
2187 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002188 link_reset_statistics(l_ptr);
Per Liden4323add2006-01-18 00:38:21 +01002189 tipc_node_unlock(node);
Per Liden4323add2006-01-18 00:38:21 +01002190 return tipc_cfg_reply_none();
Per Lidenb97bf3f2006-01-02 19:04:38 +01002191}
2192
2193/**
2194 * percent - convert count to a percentage of total (rounding up or down)
2195 */
Per Lidenb97bf3f2006-01-02 19:04:38 +01002196static u32 percent(u32 count, u32 total)
2197{
2198 return (count * 100 + (total / 2)) / total;
2199}
2200
2201/**
Per Liden4323add2006-01-18 00:38:21 +01002202 * tipc_link_stats - print link statistics
Per Lidenb97bf3f2006-01-02 19:04:38 +01002203 * @name: link name
2204 * @buf: print buffer area
2205 * @buf_size: size of print buffer area
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002206 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01002207 * Returns length of print buffer data string (or 0 if error)
2208 */
Per Liden4323add2006-01-18 00:38:21 +01002209static int tipc_link_stats(const char *name, char *buf, const u32 buf_size)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002210{
Erik Hugnedc1aed32012-06-29 00:50:23 -04002211 struct tipc_link *l;
2212 struct tipc_stats *s;
David S. Miller6c000552008-09-02 23:38:32 -07002213 struct tipc_node *node;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002214 char *status;
2215 u32 profile_total = 0;
Jon Paul Maloye099e862014-02-13 17:29:18 -05002216 unsigned int bearer_id;
Erik Hugnedc1aed32012-06-29 00:50:23 -04002217 int ret;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002218
Per Liden4323add2006-01-18 00:38:21 +01002219 if (!strcmp(name, tipc_bclink_name))
2220 return tipc_bclink_stats(buf, buf_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002221
Jon Paul Maloye099e862014-02-13 17:29:18 -05002222 node = tipc_link_find_owner(name, &bearer_id);
Ying Xue7216cd92014-04-21 10:55:48 +08002223 if (!node)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002224 return 0;
Ying Xue7216cd92014-04-21 10:55:48 +08002225
Per Liden4323add2006-01-18 00:38:21 +01002226 tipc_node_lock(node);
Jon Paul Maloye099e862014-02-13 17:29:18 -05002227
2228 l = node->links[bearer_id];
2229 if (!l) {
2230 tipc_node_unlock(node);
Jon Paul Maloye099e862014-02-13 17:29:18 -05002231 return 0;
2232 }
2233
Erik Hugnedc1aed32012-06-29 00:50:23 -04002234 s = &l->stats;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002235
Erik Hugnedc1aed32012-06-29 00:50:23 -04002236 if (tipc_link_is_active(l))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002237 status = "ACTIVE";
Erik Hugnedc1aed32012-06-29 00:50:23 -04002238 else if (tipc_link_is_up(l))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002239 status = "STANDBY";
2240 else
2241 status = "DEFUNCT";
Erik Hugnedc1aed32012-06-29 00:50:23 -04002242
2243 ret = tipc_snprintf(buf, buf_size, "Link <%s>\n"
2244 " %s MTU:%u Priority:%u Tolerance:%u ms"
2245 " Window:%u packets\n",
2246 l->name, status, l->max_pkt, l->priority,
2247 l->tolerance, l->queue_limit[0]);
2248
2249 ret += tipc_snprintf(buf + ret, buf_size - ret,
2250 " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
2251 l->next_in_no - s->recv_info, s->recv_fragments,
2252 s->recv_fragmented, s->recv_bundles,
2253 s->recv_bundled);
2254
2255 ret += tipc_snprintf(buf + ret, buf_size - ret,
2256 " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
2257 l->next_out_no - s->sent_info, s->sent_fragments,
2258 s->sent_fragmented, s->sent_bundles,
2259 s->sent_bundled);
2260
2261 profile_total = s->msg_length_counts;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002262 if (!profile_total)
2263 profile_total = 1;
Erik Hugnedc1aed32012-06-29 00:50:23 -04002264
2265 ret += tipc_snprintf(buf + ret, buf_size - ret,
2266 " TX profile sample:%u packets average:%u octets\n"
2267 " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% "
2268 "-16384:%u%% -32768:%u%% -66000:%u%%\n",
2269 s->msg_length_counts,
2270 s->msg_lengths_total / profile_total,
2271 percent(s->msg_length_profile[0], profile_total),
2272 percent(s->msg_length_profile[1], profile_total),
2273 percent(s->msg_length_profile[2], profile_total),
2274 percent(s->msg_length_profile[3], profile_total),
2275 percent(s->msg_length_profile[4], profile_total),
2276 percent(s->msg_length_profile[5], profile_total),
2277 percent(s->msg_length_profile[6], profile_total));
2278
2279 ret += tipc_snprintf(buf + ret, buf_size - ret,
2280 " RX states:%u probes:%u naks:%u defs:%u"
2281 " dups:%u\n", s->recv_states, s->recv_probes,
2282 s->recv_nacks, s->deferred_recv, s->duplicates);
2283
2284 ret += tipc_snprintf(buf + ret, buf_size - ret,
2285 " TX states:%u probes:%u naks:%u acks:%u"
2286 " dups:%u\n", s->sent_states, s->sent_probes,
2287 s->sent_nacks, s->sent_acks, s->retransmitted);
2288
2289 ret += tipc_snprintf(buf + ret, buf_size - ret,
Ying Xue3c294cb2012-11-15 11:34:45 +08002290 " Congestion link:%u Send queue"
2291 " max:%u avg:%u\n", s->link_congs,
Erik Hugnedc1aed32012-06-29 00:50:23 -04002292 s->max_queue_sz, s->queue_sz_counts ?
2293 (s->accu_queue_sz / s->queue_sz_counts) : 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002294
Per Liden4323add2006-01-18 00:38:21 +01002295 tipc_node_unlock(node);
Erik Hugnedc1aed32012-06-29 00:50:23 -04002296 return ret;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002297}
2298
Per Liden4323add2006-01-18 00:38:21 +01002299struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002300{
2301 struct sk_buff *buf;
2302 struct tlv_desc *rep_tlv;
2303 int str_len;
Erik Hugnedc1aed32012-06-29 00:50:23 -04002304 int pb_len;
2305 char *pb;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002306
2307 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
Per Liden4323add2006-01-18 00:38:21 +01002308 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002309
Erik Hugnedc1aed32012-06-29 00:50:23 -04002310 buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002311 if (!buf)
2312 return NULL;
2313
2314 rep_tlv = (struct tlv_desc *)buf->data;
Erik Hugnedc1aed32012-06-29 00:50:23 -04002315 pb = TLV_DATA(rep_tlv);
2316 pb_len = ULTRA_STRING_MAX_LEN;
Per Liden4323add2006-01-18 00:38:21 +01002317 str_len = tipc_link_stats((char *)TLV_DATA(req_tlv_area),
Erik Hugnedc1aed32012-06-29 00:50:23 -04002318 pb, pb_len);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002319 if (!str_len) {
Allan Stephens5f6d9122011-11-04 13:24:29 -04002320 kfree_skb(buf);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002321 return tipc_cfg_reply_error_string("link not found");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002322 }
Erik Hugnedc1aed32012-06-29 00:50:23 -04002323 str_len += 1; /* for "\0" */
Per Lidenb97bf3f2006-01-02 19:04:38 +01002324 skb_put(buf, TLV_SPACE(str_len));
2325 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
2326
2327 return buf;
2328}
2329
Per Lidenb97bf3f2006-01-02 19:04:38 +01002330/**
Per Liden4323add2006-01-18 00:38:21 +01002331 * tipc_link_get_max_pkt - get maximum packet size to use when sending to destination
Per Lidenb97bf3f2006-01-02 19:04:38 +01002332 * @dest: network address of destination node
2333 * @selector: used to select from set of active links
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002334 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01002335 * If no active link can be found, uses default maximum packet size.
2336 */
Per Liden4323add2006-01-18 00:38:21 +01002337u32 tipc_link_get_max_pkt(u32 dest, u32 selector)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002338{
David S. Miller6c000552008-09-02 23:38:32 -07002339 struct tipc_node *n_ptr;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05002340 struct tipc_link *l_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002341 u32 res = MAX_PKT_DEFAULT;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002342
Per Lidenb97bf3f2006-01-02 19:04:38 +01002343 if (dest == tipc_own_addr)
2344 return MAX_MSG_SIZE;
2345
Allan Stephens51a8e4d2010-12-31 18:59:18 +00002346 n_ptr = tipc_node_find(dest);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002347 if (n_ptr) {
Per Liden4323add2006-01-18 00:38:21 +01002348 tipc_node_lock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002349 l_ptr = n_ptr->active_links[selector & 1];
2350 if (l_ptr)
Allan Stephens15e979d2010-05-11 14:30:10 +00002351 res = l_ptr->max_pkt;
Per Liden4323add2006-01-18 00:38:21 +01002352 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002353 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002354 return res;
2355}
2356
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05002357static void link_print(struct tipc_link *l_ptr, const char *str)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002358{
Ying Xue7a2f7d12014-04-21 10:55:46 +08002359 struct tipc_bearer *b_ptr;
2360
2361 rcu_read_lock();
2362 b_ptr = rcu_dereference_rtnl(bearer_list[l_ptr->bearer_id]);
2363 if (b_ptr)
2364 pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name);
2365 rcu_read_unlock();
Allan Stephens8d64a5b2010-12-31 18:59:27 +00002366
Per Lidenb97bf3f2006-01-02 19:04:38 +01002367 if (link_working_unknown(l_ptr))
Paul Gortmaker5deedde2012-07-11 19:27:56 -04002368 pr_cont(":WU\n");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00002369 else if (link_reset_reset(l_ptr))
Paul Gortmaker5deedde2012-07-11 19:27:56 -04002370 pr_cont(":RR\n");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00002371 else if (link_reset_unknown(l_ptr))
Paul Gortmaker5deedde2012-07-11 19:27:56 -04002372 pr_cont(":RU\n");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00002373 else if (link_working_working(l_ptr))
Paul Gortmaker5deedde2012-07-11 19:27:56 -04002374 pr_cont(":WW\n");
2375 else
2376 pr_cont("\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002377}