blob: 14f09b3cb87c2fd9c87c67dfb67ce5e8df7d9f0f [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"
Richard Alpe7be57fc2014-11-20 10:29:12 +010039#include "bcast.h"
Jon Paul Maloy9816f062014-05-14 05:39:15 -040040#include "socket.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010041#include "name_distr.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010042#include "discover.h"
Richard Alpe0655f6a2014-11-20 10:29:07 +010043#include "netlink.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010044
Ying Xue796c75d2013-06-17 10:54:48 -040045#include <linux/pkt_sched.h>
46
Erik Hugne2cf8aa12012-06-29 00:16:37 -040047/*
48 * Error message prefixes
49 */
50static const char *link_co_err = "Link changeover error, ";
51static const char *link_rst_msg = "Resetting link ";
52static const char *link_unk_evt = "Unknown link event ";
Per Lidenb97bf3f2006-01-02 19:04:38 +010053
Richard Alpe7be57fc2014-11-20 10:29:12 +010054static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
55 [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC },
56 [TIPC_NLA_LINK_NAME] = {
57 .type = NLA_STRING,
58 .len = TIPC_MAX_LINK_NAME
59 },
60 [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 },
61 [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG },
62 [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG },
63 [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG },
64 [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED },
65 [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED },
66 [TIPC_NLA_LINK_RX] = { .type = NLA_U32 },
67 [TIPC_NLA_LINK_TX] = { .type = NLA_U32 }
68};
69
Richard Alpe0655f6a2014-11-20 10:29:07 +010070/* Properties valid for media, bearar and link */
71static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
72 [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC },
73 [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 },
74 [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 },
75 [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 }
76};
77
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090078/*
Allan Stephensa686e682008-06-04 17:29:39 -070079 * Out-of-range value for link session numbers
80 */
Allan Stephensa686e682008-06-04 17:29:39 -070081#define INVALID_SESSION 0x10000
82
83/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090084 * Link state events:
Per Lidenb97bf3f2006-01-02 19:04:38 +010085 */
Per Lidenb97bf3f2006-01-02 19:04:38 +010086#define STARTING_EVT 856384768 /* link processing trigger */
87#define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
88#define TIMEOUT_EVT 560817u /* link timer expired */
89
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090090/*
91 * The following two 'message types' is really just implementation
92 * data conveniently stored in the message header.
Per Lidenb97bf3f2006-01-02 19:04:38 +010093 * They must not be considered part of the protocol
94 */
95#define OPEN_MSG 0
96#define CLOSED_MSG 1
97
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090098/*
Per Lidenb97bf3f2006-01-02 19:04:38 +010099 * State value stored in 'exp_msg_count'
100 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100101#define START_CHANGEOVER 100000u
102
Jon Paul Maloyc5898632015-02-05 08:36:36 -0500103static void link_handle_out_of_seq_msg(struct tipc_link *link,
104 struct sk_buff *skb);
105static void tipc_link_proto_rcv(struct tipc_link *link,
106 struct sk_buff *skb);
107static int tipc_link_tunnel_rcv(struct tipc_node *node,
108 struct sk_buff **skb);
Ying Xue2f55c432015-01-09 15:27:00 +0800109static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol);
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500110static void link_state_event(struct tipc_link *l_ptr, u32 event);
111static void link_reset_statistics(struct tipc_link *l_ptr);
112static void link_print(struct tipc_link *l_ptr, const char *str);
Ying Xue247f0f32014-02-18 16:06:46 +0800113static void tipc_link_sync_xmit(struct tipc_link *l);
114static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf);
Jon Paul Maloyc637c102015-02-05 08:36:41 -0500115static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb);
116static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb);
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000117
Per Lidenb97bf3f2006-01-02 19:04:38 +0100118/*
Sam Ravnborg05790c62006-03-20 22:37:04 -0800119 * Simple link routines
Per Lidenb97bf3f2006-01-02 19:04:38 +0100120 */
Sam Ravnborg05790c62006-03-20 22:37:04 -0800121static unsigned int align(unsigned int i)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100122{
123 return (i + 3) & ~3u;
124}
125
Jon Paul Maloy2d72d492015-02-03 08:59:17 -0500126static void tipc_link_release(struct kref *kref)
127{
128 kfree(container_of(kref, struct tipc_link, ref));
129}
130
131static void tipc_link_get(struct tipc_link *l_ptr)
132{
133 kref_get(&l_ptr->ref);
134}
135
136static void tipc_link_put(struct tipc_link *l_ptr)
137{
138 kref_put(&l_ptr->ref, tipc_link_release);
139}
140
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500141static void link_init_max_pkt(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100142{
Ying Xue7f9f95d2015-01-09 15:27:06 +0800143 struct tipc_node *node = l_ptr->owner;
144 struct tipc_net *tn = net_generic(node->net, tipc_net_id);
Ying Xue7a2f7d12014-04-21 10:55:46 +0800145 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100146 u32 max_pkt;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900147
Ying Xue7a2f7d12014-04-21 10:55:46 +0800148 rcu_read_lock();
Ying Xue7f9f95d2015-01-09 15:27:06 +0800149 b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]);
Ying Xue7a2f7d12014-04-21 10:55:46 +0800150 if (!b_ptr) {
151 rcu_read_unlock();
152 return;
153 }
154 max_pkt = (b_ptr->mtu & ~3);
155 rcu_read_unlock();
156
Per Lidenb97bf3f2006-01-02 19:04:38 +0100157 if (max_pkt > MAX_MSG_SIZE)
158 max_pkt = MAX_MSG_SIZE;
159
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900160 l_ptr->max_pkt_target = max_pkt;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100161 if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT)
162 l_ptr->max_pkt = l_ptr->max_pkt_target;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900163 else
Per Lidenb97bf3f2006-01-02 19:04:38 +0100164 l_ptr->max_pkt = MAX_PKT_DEFAULT;
165
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900166 l_ptr->max_pkt_probes = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100167}
168
Per Lidenb97bf3f2006-01-02 19:04:38 +0100169/*
Sam Ravnborg05790c62006-03-20 22:37:04 -0800170 * Simple non-static link routines (i.e. referenced outside this file)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100171 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500172int tipc_link_is_up(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100173{
174 if (!l_ptr)
175 return 0;
Eric Dumazeta02cec22010-09-22 20:43:57 +0000176 return link_working_working(l_ptr) || link_working_unknown(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100177}
178
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500179int tipc_link_is_active(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100180{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000181 return (l_ptr->owner->active_links[0] == l_ptr) ||
182 (l_ptr->owner->active_links[1] == l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100183}
184
185/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100186 * link_timeout - handle expiration of link timer
187 * @l_ptr: pointer to link
Per Lidenb97bf3f2006-01-02 19:04:38 +0100188 */
Ying Xue2f55c432015-01-09 15:27:00 +0800189static void link_timeout(unsigned long data)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100190{
Ying Xue2f55c432015-01-09 15:27:00 +0800191 struct tipc_link *l_ptr = (struct tipc_link *)data;
Ying Xue58dc55f2014-11-26 11:41:52 +0800192 struct sk_buff *skb;
193
Per Liden4323add2006-01-18 00:38:21 +0100194 tipc_node_lock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100195
196 /* update counters used in statistical profiling of send traffic */
Ying Xue58dc55f2014-11-26 11:41:52 +0800197 l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->outqueue);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100198 l_ptr->stats.queue_sz_counts++;
199
Ying Xue58dc55f2014-11-26 11:41:52 +0800200 skb = skb_peek(&l_ptr->outqueue);
201 if (skb) {
202 struct tipc_msg *msg = buf_msg(skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100203 u32 length = msg_size(msg);
204
Joe Perchesf64f9e72009-11-29 16:55:45 -0800205 if ((msg_user(msg) == MSG_FRAGMENTER) &&
206 (msg_type(msg) == FIRST_FRAGMENT)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100207 length = msg_size(msg_get_wrapped(msg));
208 }
209 if (length) {
210 l_ptr->stats.msg_lengths_total += length;
211 l_ptr->stats.msg_length_counts++;
212 if (length <= 64)
213 l_ptr->stats.msg_length_profile[0]++;
214 else if (length <= 256)
215 l_ptr->stats.msg_length_profile[1]++;
216 else if (length <= 1024)
217 l_ptr->stats.msg_length_profile[2]++;
218 else if (length <= 4096)
219 l_ptr->stats.msg_length_profile[3]++;
220 else if (length <= 16384)
221 l_ptr->stats.msg_length_profile[4]++;
222 else if (length <= 32768)
223 l_ptr->stats.msg_length_profile[5]++;
224 else
225 l_ptr->stats.msg_length_profile[6]++;
226 }
227 }
228
229 /* do all other link processing performed on a periodic basis */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100230 link_state_event(l_ptr, TIMEOUT_EVT);
231
232 if (l_ptr->next_out)
Ying Xue47b4c9a82014-11-26 11:41:48 +0800233 tipc_link_push_packets(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100234
Per Liden4323add2006-01-18 00:38:21 +0100235 tipc_node_unlock(l_ptr->owner);
Jon Paul Maloy2d72d492015-02-03 08:59:17 -0500236 tipc_link_put(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100237}
238
Ying Xue2f55c432015-01-09 15:27:00 +0800239static void link_set_timer(struct tipc_link *link, unsigned long time)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100240{
Jon Paul Maloy2d72d492015-02-03 08:59:17 -0500241 if (!mod_timer(&link->timer, jiffies + time))
242 tipc_link_get(link);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100243}
244
245/**
Per Liden4323add2006-01-18 00:38:21 +0100246 * tipc_link_create - create a new link
Allan Stephens37b9c082011-02-28 11:32:27 -0500247 * @n_ptr: pointer to associated node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100248 * @b_ptr: pointer to associated bearer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100249 * @media_addr: media address to use when sending messages over link
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900250 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100251 * Returns pointer to link.
252 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500253struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
Ying Xuec61dd612014-02-13 17:29:09 -0500254 struct tipc_bearer *b_ptr,
255 const struct tipc_media_addr *media_addr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100256{
Ying Xue34747532015-01-09 15:27:10 +0800257 struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id);
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500258 struct tipc_link *l_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100259 struct tipc_msg *msg;
260 char *if_name;
Allan Stephens37b9c082011-02-28 11:32:27 -0500261 char addr_string[16];
262 u32 peer = n_ptr->addr;
263
Holger Brunck0372bf52014-11-14 18:33:19 +0100264 if (n_ptr->link_cnt >= MAX_BEARERS) {
Allan Stephens37b9c082011-02-28 11:32:27 -0500265 tipc_addr_string_fill(addr_string, n_ptr->addr);
Holger Brunck0372bf52014-11-14 18:33:19 +0100266 pr_err("Attempt to establish %uth link to %s. Max %u allowed.\n",
267 n_ptr->link_cnt, addr_string, MAX_BEARERS);
Allan Stephens37b9c082011-02-28 11:32:27 -0500268 return NULL;
269 }
270
271 if (n_ptr->links[b_ptr->identity]) {
272 tipc_addr_string_fill(addr_string, n_ptr->addr);
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400273 pr_err("Attempt to establish second link on <%s> to %s\n",
274 b_ptr->name, addr_string);
Allan Stephens37b9c082011-02-28 11:32:27 -0500275 return NULL;
276 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100277
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700278 l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100279 if (!l_ptr) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400280 pr_warn("Link creation failed, no memory\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100281 return NULL;
282 }
Jon Paul Maloy2d72d492015-02-03 08:59:17 -0500283 kref_init(&l_ptr->ref);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100284 l_ptr->addr = peer;
Allan Stephens2d627b92011-01-07 13:00:11 -0500285 if_name = strchr(b_ptr->name, ':') + 1;
Allan Stephens062b4c92011-04-07 09:28:47 -0400286 sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
Ying Xue34747532015-01-09 15:27:10 +0800287 tipc_zone(tn->own_addr), tipc_cluster(tn->own_addr),
288 tipc_node(tn->own_addr),
Per Lidenb97bf3f2006-01-02 19:04:38 +0100289 if_name,
290 tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
Allan Stephens062b4c92011-04-07 09:28:47 -0400291 /* note: peer i/f name is updated by reset/activate message */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100292 memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
Allan Stephens37b9c082011-02-28 11:32:27 -0500293 l_ptr->owner = n_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100294 l_ptr->checkpoint = 1;
Allan Stephensf882cb762011-04-07 09:43:27 -0400295 l_ptr->peer_session = INVALID_SESSION;
Ying Xue7a2f7d12014-04-21 10:55:46 +0800296 l_ptr->bearer_id = b_ptr->identity;
Allan Stephens5c216e12011-10-18 11:34:29 -0400297 link_set_supervision_props(l_ptr, b_ptr->tolerance);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100298 l_ptr->state = RESET_UNKNOWN;
299
300 l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
301 msg = l_ptr->pmsg;
Jon Paul Maloyc5898632015-02-05 08:36:36 -0500302 tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE,
Ying Xue34747532015-01-09 15:27:10 +0800303 l_ptr->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100304 msg_set_size(msg, sizeof(l_ptr->proto_msg));
Ying Xuebafa29e2015-01-09 15:27:12 +0800305 msg_set_session(msg, (tn->random & 0xffff));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100306 msg_set_bearer_id(msg, b_ptr->identity);
307 strcpy((char *)msg_data(msg), if_name);
308
309 l_ptr->priority = b_ptr->priority;
Allan Stephens5c216e12011-10-18 11:34:29 -0400310 tipc_link_set_queue_limits(l_ptr, b_ptr->window);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100311
Ying Xue7a2f7d12014-04-21 10:55:46 +0800312 l_ptr->net_plane = b_ptr->net_plane;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100313 link_init_max_pkt(l_ptr);
314
315 l_ptr->next_out_no = 1;
Ying Xue58dc55f2014-11-26 11:41:52 +0800316 __skb_queue_head_init(&l_ptr->outqueue);
Ying Xuebc6fecd2014-11-26 11:41:53 +0800317 __skb_queue_head_init(&l_ptr->deferred_queue);
Jon Paul Maloyc637c102015-02-05 08:36:41 -0500318 skb_queue_head_init(&l_ptr->wakeupq);
319 skb_queue_head_init(&l_ptr->inputq);
320 skb_queue_head_init(&l_ptr->namedq);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100321 link_reset_statistics(l_ptr);
Allan Stephens37b9c082011-02-28 11:32:27 -0500322 tipc_node_attach_link(n_ptr, l_ptr);
Ying Xue2f55c432015-01-09 15:27:00 +0800323 setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr);
Jon Paul Maloy581465f2014-01-07 17:02:44 -0500324 link_state_event(l_ptr, STARTING_EVT);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100325
Per Lidenb97bf3f2006-01-02 19:04:38 +0100326 return l_ptr;
327}
328
Jon Paul Maloy2d72d492015-02-03 08:59:17 -0500329/**
330 * link_delete - Conditional deletion of link.
331 * If timer still running, real delete is done when it expires
332 * @link: link to be deleted
333 */
334void tipc_link_delete(struct tipc_link *link)
335{
336 tipc_link_reset_fragments(link);
337 tipc_node_detach_link(link->owner, link);
338 tipc_link_put(link);
339}
340
Ying Xuef2f98002015-01-09 15:27:05 +0800341void tipc_link_delete_list(struct net *net, unsigned int bearer_id,
342 bool shutting_down)
Ying Xue8d8439b2014-02-13 17:29:07 -0500343{
Ying Xuef2f98002015-01-09 15:27:05 +0800344 struct tipc_net *tn = net_generic(net, tipc_net_id);
Jon Paul Maloy2d72d492015-02-03 08:59:17 -0500345 struct tipc_link *link;
346 struct tipc_node *node;
Ying Xue8d8439b2014-02-13 17:29:07 -0500347
Ying Xue6c7a7622014-03-27 12:54:37 +0800348 rcu_read_lock();
Jon Paul Maloy2d72d492015-02-03 08:59:17 -0500349 list_for_each_entry_rcu(node, &tn->node_list, list) {
350 tipc_node_lock(node);
351 link = node->links[bearer_id];
352 if (!link) {
353 tipc_node_unlock(node);
Ying Xuec61dd612014-02-13 17:29:09 -0500354 continue;
355 }
Jon Paul Maloy2d72d492015-02-03 08:59:17 -0500356 tipc_link_reset(link);
357 if (del_timer(&link->timer))
358 tipc_link_put(link);
359 link->flags |= LINK_STOPPED;
360 /* Delete link now, or when failover is finished: */
361 if (shutting_down || !tipc_node_is_up(node))
362 tipc_link_delete(link);
363 tipc_node_unlock(node);
Ying Xue8d8439b2014-02-13 17:29:07 -0500364 }
Ying Xue6c7a7622014-03-27 12:54:37 +0800365 rcu_read_unlock();
Ying Xue8d8439b2014-02-13 17:29:07 -0500366}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100367
368/**
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400369 * link_schedule_user - schedule user for wakeup after congestion
370 * @link: congested link
371 * @oport: sending port
372 * @chain_sz: size of buffer chain that was attempted sent
373 * @imp: importance of message attempted sent
374 * Create pseudo msg to send back to user when congestion abates
Per Lidenb97bf3f2006-01-02 19:04:38 +0100375 */
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400376static bool link_schedule_user(struct tipc_link *link, u32 oport,
377 uint chain_sz, uint imp)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100378{
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400379 struct sk_buff *buf;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100380
Jon Paul Maloyc5898632015-02-05 08:36:36 -0500381 buf = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0,
382 link_own_addr(link), link_own_addr(link),
383 oport, 0, 0);
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400384 if (!buf)
385 return false;
386 TIPC_SKB_CB(buf)->chain_sz = chain_sz;
387 TIPC_SKB_CB(buf)->chain_imp = imp;
Jon Paul Maloyc637c102015-02-05 08:36:41 -0500388 skb_queue_tail(&link->wakeupq, buf);
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400389 link->stats.link_congs++;
390 return true;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100391}
392
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400393/**
394 * link_prepare_wakeup - prepare users for wakeup after congestion
395 * @link: congested link
396 * Move a number of waiting users, as permitted by available space in
397 * the send queue, from link wait queue to node wait queue for wakeup
398 */
Jon Paul Maloyc637c102015-02-05 08:36:41 -0500399void link_prepare_wakeup(struct tipc_link *link)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100400{
Ying Xue58dc55f2014-11-26 11:41:52 +0800401 uint pend_qsz = skb_queue_len(&link->outqueue);
Ying Xue58d78b32014-11-26 11:41:51 +0800402 struct sk_buff *skb, *tmp;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100403
Jon Paul Maloyc637c102015-02-05 08:36:41 -0500404 skb_queue_walk_safe(&link->wakeupq, skb, tmp) {
Ying Xue58d78b32014-11-26 11:41:51 +0800405 if (pend_qsz >= link->queue_limit[TIPC_SKB_CB(skb)->chain_imp])
Per Lidenb97bf3f2006-01-02 19:04:38 +0100406 break;
Ying Xue58d78b32014-11-26 11:41:51 +0800407 pend_qsz += TIPC_SKB_CB(skb)->chain_sz;
Jon Paul Maloyc637c102015-02-05 08:36:41 -0500408 skb_unlink(skb, &link->wakeupq);
409 skb_queue_tail(&link->inputq, skb);
410 link->owner->inputq = &link->inputq;
411 link->owner->action_flags |= TIPC_MSG_EVT;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100412 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100413}
414
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900415/**
Per Liden4323add2006-01-18 00:38:21 +0100416 * tipc_link_reset_fragments - purge link's inbound message fragments queue
Per Lidenb97bf3f2006-01-02 19:04:38 +0100417 * @l_ptr: pointer to link
418 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500419void tipc_link_reset_fragments(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100420{
Jon Paul Maloy37e22162014-05-14 05:39:12 -0400421 kfree_skb(l_ptr->reasm_buf);
422 l_ptr->reasm_buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100423}
424
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900425/**
Jon Paul Maloy581465f2014-01-07 17:02:44 -0500426 * tipc_link_purge_queues - purge all pkt queues associated with link
Per Lidenb97bf3f2006-01-02 19:04:38 +0100427 * @l_ptr: pointer to link
428 */
Jon Paul Maloy581465f2014-01-07 17:02:44 -0500429void tipc_link_purge_queues(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100430{
Ying Xuebc6fecd2014-11-26 11:41:53 +0800431 __skb_queue_purge(&l_ptr->deferred_queue);
Ying Xue58dc55f2014-11-26 11:41:52 +0800432 __skb_queue_purge(&l_ptr->outqueue);
Per Liden4323add2006-01-18 00:38:21 +0100433 tipc_link_reset_fragments(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100434}
435
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500436void tipc_link_reset(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100437{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100438 u32 prev_state = l_ptr->state;
439 u32 checkpoint = l_ptr->next_in_no;
Allan Stephens5392d642006-06-25 23:52:50 -0700440 int was_active_link = tipc_link_is_active(l_ptr);
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400441 struct tipc_node *owner = l_ptr->owner;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900442
Allan Stephensa686e682008-06-04 17:29:39 -0700443 msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100444
Allan Stephensa686e682008-06-04 17:29:39 -0700445 /* Link is down, accept any session */
446 l_ptr->peer_session = INVALID_SESSION;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100447
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900448 /* Prepare for max packet size negotiation */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100449 link_init_max_pkt(l_ptr);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900450
Per Lidenb97bf3f2006-01-02 19:04:38 +0100451 l_ptr->state = RESET_UNKNOWN;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100452
453 if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
454 return;
455
Per Liden4323add2006-01-18 00:38:21 +0100456 tipc_node_link_down(l_ptr->owner, l_ptr);
Ying Xue7f9f95d2015-01-09 15:27:06 +0800457 tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr);
Paul Gortmaker7368ddf2010-10-12 14:25:58 +0000458
Jon Paul Maloyb9d4c332014-01-07 17:02:42 -0500459 if (was_active_link && tipc_node_active_links(l_ptr->owner)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100460 l_ptr->reset_checkpoint = checkpoint;
461 l_ptr->exp_msg_count = START_CHANGEOVER;
462 }
463
Jon Paul Maloyc637c102015-02-05 08:36:41 -0500464 /* Clean up all queues, except inputq: */
Ying Xue58dc55f2014-11-26 11:41:52 +0800465 __skb_queue_purge(&l_ptr->outqueue);
Ying Xuebc6fecd2014-11-26 11:41:53 +0800466 __skb_queue_purge(&l_ptr->deferred_queue);
Jon Paul Maloye6441ba2015-03-09 16:16:22 -0400467 if (!owner->inputq)
468 owner->inputq = &l_ptr->inputq;
469 skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq);
470 if (!skb_queue_empty(owner->inputq))
Jon Paul Maloyc637c102015-02-05 08:36:41 -0500471 owner->action_flags |= TIPC_MSG_EVT;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100472 l_ptr->next_out = NULL;
473 l_ptr->unacked_window = 0;
474 l_ptr->checkpoint = 1;
475 l_ptr->next_out_no = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100476 l_ptr->fsm_msg_cnt = 0;
477 l_ptr->stale_count = 0;
478 link_reset_statistics(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100479}
480
Ying Xuef2f98002015-01-09 15:27:05 +0800481void tipc_link_reset_list(struct net *net, unsigned int bearer_id)
Ying Xuee0ca2c32014-02-13 17:29:06 -0500482{
Ying Xuef2f98002015-01-09 15:27:05 +0800483 struct tipc_net *tn = net_generic(net, tipc_net_id);
Ying Xuee0ca2c32014-02-13 17:29:06 -0500484 struct tipc_link *l_ptr;
Ying Xuec61dd612014-02-13 17:29:09 -0500485 struct tipc_node *n_ptr;
Ying Xuee0ca2c32014-02-13 17:29:06 -0500486
Ying Xue6c7a7622014-03-27 12:54:37 +0800487 rcu_read_lock();
Ying Xuef2f98002015-01-09 15:27:05 +0800488 list_for_each_entry_rcu(n_ptr, &tn->node_list, list) {
Ying Xue5356f3d2014-05-05 08:56:09 +0800489 tipc_node_lock(n_ptr);
Ying Xuec61dd612014-02-13 17:29:09 -0500490 l_ptr = n_ptr->links[bearer_id];
491 if (l_ptr)
492 tipc_link_reset(l_ptr);
Ying Xue5356f3d2014-05-05 08:56:09 +0800493 tipc_node_unlock(n_ptr);
Ying Xuee0ca2c32014-02-13 17:29:06 -0500494 }
Ying Xue6c7a7622014-03-27 12:54:37 +0800495 rcu_read_unlock();
Ying Xuee0ca2c32014-02-13 17:29:06 -0500496}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100497
Ying Xue7f9f95d2015-01-09 15:27:06 +0800498static void link_activate(struct tipc_link *link)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100499{
Ying Xue7f9f95d2015-01-09 15:27:06 +0800500 struct tipc_node *node = link->owner;
501
502 link->next_in_no = 1;
503 link->stats.recv_info = 1;
504 tipc_node_link_up(node, link);
505 tipc_bearer_add_dest(node->net, link->bearer_id, link->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100506}
507
508/**
509 * link_state_event - link finite state machine
510 * @l_ptr: pointer to link
511 * @event: state machine event to process
512 */
Eric Dumazet95c96172012-04-15 05:58:06 +0000513static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100514{
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500515 struct tipc_link *other;
Ying Xue2f55c432015-01-09 15:27:00 +0800516 unsigned long cont_intv = l_ptr->cont_intv;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100517
Jon Paul Maloy7d339392014-02-13 17:29:16 -0500518 if (l_ptr->flags & LINK_STOPPED)
519 return;
520
Ying Xue135daee2014-02-13 17:29:08 -0500521 if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100522 return; /* Not yet. */
523
Ying Xue77a7e072013-12-10 20:45:44 -0800524 /* Check whether changeover is going on */
525 if (l_ptr->exp_msg_count) {
Allan Stephensa0168922010-12-31 18:59:35 +0000526 if (event == TIMEOUT_EVT)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100527 link_set_timer(l_ptr, cont_intv);
Ying Xue77a7e072013-12-10 20:45:44 -0800528 return;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100529 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100530
531 switch (l_ptr->state) {
532 case WORKING_WORKING:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100533 switch (event) {
534 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100535 case ACTIVATE_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100536 break;
537 case TIMEOUT_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100538 if (l_ptr->next_in_no != l_ptr->checkpoint) {
539 l_ptr->checkpoint = l_ptr->next_in_no;
Per Liden4323add2006-01-18 00:38:21 +0100540 if (tipc_bclink_acks_missing(l_ptr->owner)) {
Ying Xue247f0f32014-02-18 16:06:46 +0800541 tipc_link_proto_xmit(l_ptr, STATE_MSG,
542 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100543 l_ptr->fsm_msg_cnt++;
544 } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
Ying Xue247f0f32014-02-18 16:06:46 +0800545 tipc_link_proto_xmit(l_ptr, STATE_MSG,
546 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100547 l_ptr->fsm_msg_cnt++;
548 }
549 link_set_timer(l_ptr, cont_intv);
550 break;
551 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100552 l_ptr->state = WORKING_UNKNOWN;
553 l_ptr->fsm_msg_cnt = 0;
Ying Xue247f0f32014-02-18 16:06:46 +0800554 tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100555 l_ptr->fsm_msg_cnt++;
556 link_set_timer(l_ptr, cont_intv / 4);
557 break;
558 case RESET_MSG:
Erik Hugne3fa9cac2015-01-22 17:10:31 +0100559 pr_debug("%s<%s>, requested by peer\n",
560 link_rst_msg, l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100561 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100562 l_ptr->state = RESET_RESET;
563 l_ptr->fsm_msg_cnt = 0;
Ying Xue247f0f32014-02-18 16:06:46 +0800564 tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
565 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100566 l_ptr->fsm_msg_cnt++;
567 link_set_timer(l_ptr, cont_intv);
568 break;
569 default:
Erik Hugne3fa9cac2015-01-22 17:10:31 +0100570 pr_debug("%s%u in WW state\n", link_unk_evt, event);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100571 }
572 break;
573 case WORKING_UNKNOWN:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100574 switch (event) {
575 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100576 case ACTIVATE_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100577 l_ptr->state = WORKING_WORKING;
578 l_ptr->fsm_msg_cnt = 0;
579 link_set_timer(l_ptr, cont_intv);
580 break;
581 case RESET_MSG:
Erik Hugne3fa9cac2015-01-22 17:10:31 +0100582 pr_debug("%s<%s>, requested by peer while probing\n",
583 link_rst_msg, l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100584 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100585 l_ptr->state = RESET_RESET;
586 l_ptr->fsm_msg_cnt = 0;
Ying Xue247f0f32014-02-18 16:06:46 +0800587 tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
588 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100589 l_ptr->fsm_msg_cnt++;
590 link_set_timer(l_ptr, cont_intv);
591 break;
592 case TIMEOUT_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100593 if (l_ptr->next_in_no != l_ptr->checkpoint) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100594 l_ptr->state = WORKING_WORKING;
595 l_ptr->fsm_msg_cnt = 0;
596 l_ptr->checkpoint = l_ptr->next_in_no;
Per Liden4323add2006-01-18 00:38:21 +0100597 if (tipc_bclink_acks_missing(l_ptr->owner)) {
Ying Xue247f0f32014-02-18 16:06:46 +0800598 tipc_link_proto_xmit(l_ptr, STATE_MSG,
599 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100600 l_ptr->fsm_msg_cnt++;
601 }
602 link_set_timer(l_ptr, cont_intv);
603 } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
Ying Xue247f0f32014-02-18 16:06:46 +0800604 tipc_link_proto_xmit(l_ptr, STATE_MSG,
605 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100606 l_ptr->fsm_msg_cnt++;
607 link_set_timer(l_ptr, cont_intv / 4);
608 } else { /* Link has failed */
Erik Hugne3fa9cac2015-01-22 17:10:31 +0100609 pr_debug("%s<%s>, peer not responding\n",
610 link_rst_msg, l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100611 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100612 l_ptr->state = RESET_UNKNOWN;
613 l_ptr->fsm_msg_cnt = 0;
Ying Xue247f0f32014-02-18 16:06:46 +0800614 tipc_link_proto_xmit(l_ptr, RESET_MSG,
615 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100616 l_ptr->fsm_msg_cnt++;
617 link_set_timer(l_ptr, cont_intv);
618 }
619 break;
620 default:
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400621 pr_err("%s%u in WU state\n", link_unk_evt, event);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100622 }
623 break;
624 case RESET_UNKNOWN:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100625 switch (event) {
626 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100627 break;
628 case ACTIVATE_MSG:
629 other = l_ptr->owner->active_links[0];
Allan Stephens8d64a5b2010-12-31 18:59:27 +0000630 if (other && link_working_unknown(other))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100631 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100632 l_ptr->state = WORKING_WORKING;
633 l_ptr->fsm_msg_cnt = 0;
634 link_activate(l_ptr);
Ying Xue247f0f32014-02-18 16:06:46 +0800635 tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100636 l_ptr->fsm_msg_cnt++;
Jon Maloyc64f7a62012-11-16 13:51:31 +0800637 if (l_ptr->owner->working_links == 1)
Ying Xue247f0f32014-02-18 16:06:46 +0800638 tipc_link_sync_xmit(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100639 link_set_timer(l_ptr, cont_intv);
640 break;
641 case RESET_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100642 l_ptr->state = RESET_RESET;
643 l_ptr->fsm_msg_cnt = 0;
Ying Xue247f0f32014-02-18 16:06:46 +0800644 tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
645 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100646 l_ptr->fsm_msg_cnt++;
647 link_set_timer(l_ptr, cont_intv);
648 break;
649 case STARTING_EVT:
Ying Xue135daee2014-02-13 17:29:08 -0500650 l_ptr->flags |= LINK_STARTED;
Jon Paul Maloyaf9946f2015-02-03 08:59:20 -0500651 l_ptr->fsm_msg_cnt++;
652 link_set_timer(l_ptr, cont_intv);
653 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100654 case TIMEOUT_EVT:
Ying Xue247f0f32014-02-18 16:06:46 +0800655 tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100656 l_ptr->fsm_msg_cnt++;
657 link_set_timer(l_ptr, cont_intv);
658 break;
659 default:
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400660 pr_err("%s%u in RU state\n", link_unk_evt, event);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100661 }
662 break;
663 case RESET_RESET:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100664 switch (event) {
665 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100666 case ACTIVATE_MSG:
667 other = l_ptr->owner->active_links[0];
Allan Stephens8d64a5b2010-12-31 18:59:27 +0000668 if (other && link_working_unknown(other))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100669 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100670 l_ptr->state = WORKING_WORKING;
671 l_ptr->fsm_msg_cnt = 0;
672 link_activate(l_ptr);
Ying Xue247f0f32014-02-18 16:06:46 +0800673 tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100674 l_ptr->fsm_msg_cnt++;
Jon Maloyc64f7a62012-11-16 13:51:31 +0800675 if (l_ptr->owner->working_links == 1)
Ying Xue247f0f32014-02-18 16:06:46 +0800676 tipc_link_sync_xmit(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100677 link_set_timer(l_ptr, cont_intv);
678 break;
679 case RESET_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100680 break;
681 case TIMEOUT_EVT:
Ying Xue247f0f32014-02-18 16:06:46 +0800682 tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
683 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100684 l_ptr->fsm_msg_cnt++;
685 link_set_timer(l_ptr, cont_intv);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100686 break;
687 default:
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400688 pr_err("%s%u in RR state\n", link_unk_evt, event);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100689 }
690 break;
691 default:
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400692 pr_err("Unknown link state %u/%u\n", l_ptr->state, event);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100693 }
694}
695
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500696/* tipc_link_cong: determine return value and how to treat the
697 * sent buffer during link congestion.
698 * - For plain, errorless user data messages we keep the buffer and
699 * return -ELINKONG.
700 * - For all other messages we discard the buffer and return -EHOSTUNREACH
701 * - For TIPC internal messages we also reset the link
702 */
Ying Xuea6ca1092014-11-26 11:41:55 +0800703static int tipc_link_cong(struct tipc_link *link, struct sk_buff_head *list)
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500704{
Ying Xuea6ca1092014-11-26 11:41:55 +0800705 struct sk_buff *skb = skb_peek(list);
706 struct tipc_msg *msg = buf_msg(skb);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500707 uint imp = tipc_msg_tot_importance(msg);
708 u32 oport = msg_tot_origport(msg);
709
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400710 if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) {
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500711 pr_warn("%s<%s>, send queue full", link_rst_msg, link->name);
712 tipc_link_reset(link);
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400713 goto drop;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500714 }
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400715 if (unlikely(msg_errcode(msg)))
716 goto drop;
717 if (unlikely(msg_reroute_cnt(msg)))
718 goto drop;
Ying Xuea6ca1092014-11-26 11:41:55 +0800719 if (TIPC_SKB_CB(skb)->wakeup_pending)
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400720 return -ELINKCONG;
Ying Xuea6ca1092014-11-26 11:41:55 +0800721 if (link_schedule_user(link, oport, skb_queue_len(list), imp))
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400722 return -ELINKCONG;
723drop:
Ying Xuea6ca1092014-11-26 11:41:55 +0800724 __skb_queue_purge(list);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500725 return -EHOSTUNREACH;
726}
727
728/**
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -0400729 * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500730 * @link: link to use
Ying Xuea6ca1092014-11-26 11:41:55 +0800731 * @list: chain of buffers containing message
732 *
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500733 * Consumes the buffer chain, except when returning -ELINKCONG
734 * Returns 0 if success, otherwise errno: -ELINKCONG, -EMSGSIZE (plain socket
735 * user data messages) or -EHOSTUNREACH (all other messages/senders)
736 * Only the socket functions tipc_send_stream() and tipc_send_packet() need
737 * to act on the return value, since they may need to do more send attempts.
738 */
Ying Xue7f9f95d2015-01-09 15:27:06 +0800739int __tipc_link_xmit(struct net *net, struct tipc_link *link,
740 struct sk_buff_head *list)
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500741{
Ying Xuea6ca1092014-11-26 11:41:55 +0800742 struct tipc_msg *msg = buf_msg(skb_peek(list));
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500743 uint psz = msg_size(msg);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500744 uint sndlim = link->queue_limit[0];
745 uint imp = tipc_msg_tot_importance(msg);
746 uint mtu = link->max_pkt;
747 uint ack = mod(link->next_in_no - 1);
748 uint seqno = link->next_out_no;
749 uint bc_last_in = link->owner->bclink.last_in;
750 struct tipc_media_addr *addr = &link->media_addr;
Ying Xue58dc55f2014-11-26 11:41:52 +0800751 struct sk_buff_head *outqueue = &link->outqueue;
Ying Xuea6ca1092014-11-26 11:41:55 +0800752 struct sk_buff *skb, *tmp;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500753
754 /* Match queue limits against msg importance: */
Ying Xue58dc55f2014-11-26 11:41:52 +0800755 if (unlikely(skb_queue_len(outqueue) >= link->queue_limit[imp]))
Ying Xuea6ca1092014-11-26 11:41:55 +0800756 return tipc_link_cong(link, list);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500757
758 /* Has valid packet limit been used ? */
759 if (unlikely(psz > mtu)) {
Ying Xuea6ca1092014-11-26 11:41:55 +0800760 __skb_queue_purge(list);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500761 return -EMSGSIZE;
762 }
763
764 /* Prepare each packet for sending, and add to outqueue: */
Ying Xuea6ca1092014-11-26 11:41:55 +0800765 skb_queue_walk_safe(list, skb, tmp) {
766 __skb_unlink(skb, list);
Ying Xue58dc55f2014-11-26 11:41:52 +0800767 msg = buf_msg(skb);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500768 msg_set_word(msg, 2, ((ack << 16) | mod(seqno)));
769 msg_set_bcast_ack(msg, bc_last_in);
770
Ying Xue58dc55f2014-11-26 11:41:52 +0800771 if (skb_queue_len(outqueue) < sndlim) {
772 __skb_queue_tail(outqueue, skb);
Ying Xue7f9f95d2015-01-09 15:27:06 +0800773 tipc_bearer_send(net, link->bearer_id,
774 skb, addr);
Ying Xue58dc55f2014-11-26 11:41:52 +0800775 link->next_out = NULL;
776 link->unacked_window = 0;
777 } else if (tipc_msg_bundle(outqueue, skb, mtu)) {
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500778 link->stats.sent_bundled++;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500779 continue;
Jon Paul Maloyc5898632015-02-05 08:36:36 -0500780 } else if (tipc_msg_make_bundle(outqueue, skb, mtu,
Ying Xue58dc55f2014-11-26 11:41:52 +0800781 link->addr)) {
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500782 link->stats.sent_bundled++;
783 link->stats.sent_bundles++;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500784 if (!link->next_out)
Ying Xue58dc55f2014-11-26 11:41:52 +0800785 link->next_out = skb_peek_tail(outqueue);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500786 } else {
Ying Xue58dc55f2014-11-26 11:41:52 +0800787 __skb_queue_tail(outqueue, skb);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500788 if (!link->next_out)
Ying Xue58dc55f2014-11-26 11:41:52 +0800789 link->next_out = skb;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500790 }
791 seqno++;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500792 }
793 link->next_out_no = seqno;
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500794 return 0;
795}
796
Ying Xuea6ca1092014-11-26 11:41:55 +0800797static void skb2list(struct sk_buff *skb, struct sk_buff_head *list)
798{
Jon Paul Maloyc637c102015-02-05 08:36:41 -0500799 skb_queue_head_init(list);
Ying Xuea6ca1092014-11-26 11:41:55 +0800800 __skb_queue_tail(list, skb);
801}
802
803static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb)
804{
805 struct sk_buff_head head;
806
807 skb2list(skb, &head);
Ying Xue7f9f95d2015-01-09 15:27:06 +0800808 return __tipc_link_xmit(link->owner->net, link, &head);
Ying Xuea6ca1092014-11-26 11:41:55 +0800809}
810
Ying Xuef2f98002015-01-09 15:27:05 +0800811int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
812 u32 selector)
Ying Xuea6ca1092014-11-26 11:41:55 +0800813{
814 struct sk_buff_head head;
815
816 skb2list(skb, &head);
Ying Xuef2f98002015-01-09 15:27:05 +0800817 return tipc_link_xmit(net, &head, dnode, selector);
Ying Xuea6ca1092014-11-26 11:41:55 +0800818}
819
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500820/**
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -0400821 * tipc_link_xmit() is the general link level function for message sending
Ying Xuef2f98002015-01-09 15:27:05 +0800822 * @net: the applicable net namespace
Ying Xuea6ca1092014-11-26 11:41:55 +0800823 * @list: chain of buffers containing message
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500824 * @dsz: amount of user data to be sent
825 * @dnode: address of destination node
826 * @selector: a number used for deterministic link selection
827 * Consumes the buffer chain, except when returning -ELINKCONG
828 * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
829 */
Ying Xuef2f98002015-01-09 15:27:05 +0800830int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode,
831 u32 selector)
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500832{
833 struct tipc_link *link = NULL;
834 struct tipc_node *node;
835 int rc = -EHOSTUNREACH;
836
Ying Xuef2f98002015-01-09 15:27:05 +0800837 node = tipc_node_find(net, dnode);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500838 if (node) {
839 tipc_node_lock(node);
840 link = node->active_links[selector & 1];
841 if (link)
Ying Xue7f9f95d2015-01-09 15:27:06 +0800842 rc = __tipc_link_xmit(net, link, list);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500843 tipc_node_unlock(node);
844 }
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500845 if (link)
846 return rc;
847
Jon Paul Maloyc637c102015-02-05 08:36:41 -0500848 if (likely(in_own_node(net, dnode)))
849 return tipc_sk_rcv(net, list);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500850
Jon Paul Maloyc637c102015-02-05 08:36:41 -0500851 __skb_queue_purge(list);
Jon Paul Maloy4f1688b2014-06-25 20:41:32 -0500852 return rc;
853}
854
Jon Maloyc64f7a62012-11-16 13:51:31 +0800855/*
Ying Xue247f0f32014-02-18 16:06:46 +0800856 * tipc_link_sync_xmit - synchronize broadcast link endpoints.
Jon Maloyc64f7a62012-11-16 13:51:31 +0800857 *
858 * Give a newly added peer node the sequence number where it should
859 * start receiving and acking broadcast packets.
860 *
861 * Called with node locked
862 */
Jon Paul Maloy25b660c2014-07-16 20:40:59 -0400863static void tipc_link_sync_xmit(struct tipc_link *link)
Jon Maloyc64f7a62012-11-16 13:51:31 +0800864{
Ying Xuea6ca1092014-11-26 11:41:55 +0800865 struct sk_buff *skb;
Jon Maloyc64f7a62012-11-16 13:51:31 +0800866 struct tipc_msg *msg;
867
Ying Xuea6ca1092014-11-26 11:41:55 +0800868 skb = tipc_buf_acquire(INT_H_SIZE);
869 if (!skb)
Jon Maloyc64f7a62012-11-16 13:51:31 +0800870 return;
871
Ying Xuea6ca1092014-11-26 11:41:55 +0800872 msg = buf_msg(skb);
Jon Paul Maloyc5898632015-02-05 08:36:36 -0500873 tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG,
Ying Xue34747532015-01-09 15:27:10 +0800874 INT_H_SIZE, link->addr);
Jon Paul Maloy25b660c2014-07-16 20:40:59 -0400875 msg_set_last_bcast(msg, link->owner->bclink.acked);
Ying Xuea6ca1092014-11-26 11:41:55 +0800876 __tipc_link_xmit_skb(link, skb);
Jon Maloyc64f7a62012-11-16 13:51:31 +0800877}
878
879/*
Ying Xue247f0f32014-02-18 16:06:46 +0800880 * tipc_link_sync_rcv - synchronize broadcast link endpoints.
Jon Maloyc64f7a62012-11-16 13:51:31 +0800881 * Receive the sequence number where we should start receiving and
882 * acking broadcast packets from a newly added peer node, and open
883 * up for reception of such packets.
884 *
885 * Called with node locked
886 */
Ying Xue247f0f32014-02-18 16:06:46 +0800887static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf)
Jon Maloyc64f7a62012-11-16 13:51:31 +0800888{
889 struct tipc_msg *msg = buf_msg(buf);
890
891 n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg);
892 n->bclink.recv_permitted = true;
893 kfree_skb(buf);
894}
895
Ying Xue58dc55f2014-11-26 11:41:52 +0800896struct sk_buff *tipc_skb_queue_next(const struct sk_buff_head *list,
897 const struct sk_buff *skb)
898{
899 if (skb_queue_is_last(list, skb))
900 return NULL;
901 return skb->next;
902}
903
Jon Maloyc64f7a62012-11-16 13:51:31 +0800904/*
Ying Xue47b4c9a82014-11-26 11:41:48 +0800905 * tipc_link_push_packets - push unsent packets to bearer
906 *
907 * Push out the unsent messages of a link where congestion
908 * has abated. Node is locked.
909 *
910 * Called with node locked
Per Lidenb97bf3f2006-01-02 19:04:38 +0100911 */
Ying Xue47b4c9a82014-11-26 11:41:48 +0800912void tipc_link_push_packets(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100913{
Ying Xue58dc55f2014-11-26 11:41:52 +0800914 struct sk_buff_head *outqueue = &l_ptr->outqueue;
915 struct sk_buff *skb = l_ptr->next_out;
Ying Xue47b4c9a82014-11-26 11:41:48 +0800916 struct tipc_msg *msg;
917 u32 next, first;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100918
Ying Xue58dc55f2014-11-26 11:41:52 +0800919 skb_queue_walk_from(outqueue, skb) {
Ying Xue47b4c9a82014-11-26 11:41:48 +0800920 msg = buf_msg(skb);
921 next = msg_seqno(msg);
Ying Xue58dc55f2014-11-26 11:41:52 +0800922 first = buf_seqno(skb_peek(outqueue));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100923
924 if (mod(next - first) < l_ptr->queue_limit[0]) {
925 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900926 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Ying Xue3c294cb2012-11-15 11:34:45 +0800927 if (msg_user(msg) == MSG_BUNDLER)
Ying Xue58311d12014-11-26 11:41:49 +0800928 TIPC_SKB_CB(skb)->bundling = false;
Ying Xue7f9f95d2015-01-09 15:27:06 +0800929 tipc_bearer_send(l_ptr->owner->net,
930 l_ptr->bearer_id, skb,
Ying Xue47b4c9a82014-11-26 11:41:48 +0800931 &l_ptr->media_addr);
Ying Xue58dc55f2014-11-26 11:41:52 +0800932 l_ptr->next_out = tipc_skb_queue_next(outqueue, skb);
Ying Xue47b4c9a82014-11-26 11:41:48 +0800933 } else {
934 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100935 }
936 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100937}
938
Ying Xue3f5a12b2014-05-05 08:56:17 +0800939void tipc_link_reset_all(struct tipc_node *node)
Allan Stephensd356eeb2006-06-25 23:40:01 -0700940{
Allan Stephensd356eeb2006-06-25 23:40:01 -0700941 char addr_string[16];
942 u32 i;
943
Ying Xue3f5a12b2014-05-05 08:56:17 +0800944 tipc_node_lock(node);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700945
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400946 pr_warn("Resetting all links to %s\n",
Ying Xue3f5a12b2014-05-05 08:56:17 +0800947 tipc_addr_string_fill(addr_string, node->addr));
Allan Stephensd356eeb2006-06-25 23:40:01 -0700948
949 for (i = 0; i < MAX_BEARERS; i++) {
Ying Xue3f5a12b2014-05-05 08:56:17 +0800950 if (node->links[i]) {
951 link_print(node->links[i], "Resetting link\n");
952 tipc_link_reset(node->links[i]);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700953 }
954 }
955
Ying Xue3f5a12b2014-05-05 08:56:17 +0800956 tipc_node_unlock(node);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700957}
958
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500959static void link_retransmit_failure(struct tipc_link *l_ptr,
Paul Gortmakerae8509c2013-06-17 10:54:47 -0400960 struct sk_buff *buf)
Allan Stephensd356eeb2006-06-25 23:40:01 -0700961{
962 struct tipc_msg *msg = buf_msg(buf);
Ying Xue1da46562015-01-09 15:27:07 +0800963 struct net *net = l_ptr->owner->net;
Allan Stephensd356eeb2006-06-25 23:40:01 -0700964
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400965 pr_warn("Retransmission failure on link <%s>\n", l_ptr->name);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700966
967 if (l_ptr->addr) {
Allan Stephensd356eeb2006-06-25 23:40:01 -0700968 /* Handle failure on standard link */
Allan Stephens8d64a5b2010-12-31 18:59:27 +0000969 link_print(l_ptr, "Resetting link\n");
Allan Stephensd356eeb2006-06-25 23:40:01 -0700970 tipc_link_reset(l_ptr);
971
972 } else {
Allan Stephensd356eeb2006-06-25 23:40:01 -0700973 /* Handle failure on broadcast link */
David S. Miller6c000552008-09-02 23:38:32 -0700974 struct tipc_node *n_ptr;
Allan Stephensd356eeb2006-06-25 23:40:01 -0700975 char addr_string[16];
976
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400977 pr_info("Msg seq number: %u, ", msg_seqno(msg));
978 pr_cont("Outstanding acks: %lu\n",
979 (unsigned long) TIPC_SKB_CB(buf)->handle);
Jeff Garzik617dbea2006-10-03 16:25:34 -0700980
Ying Xue1da46562015-01-09 15:27:07 +0800981 n_ptr = tipc_bclink_retransmit_to(net);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700982 tipc_node_lock(n_ptr);
983
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000984 tipc_addr_string_fill(addr_string, n_ptr->addr);
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400985 pr_info("Broadcast link info for %s\n", addr_string);
Ying Xue389dd9b2012-11-16 13:51:30 +0800986 pr_info("Reception permitted: %d, Acked: %u\n",
987 n_ptr->bclink.recv_permitted,
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400988 n_ptr->bclink.acked);
989 pr_info("Last in: %u, Oos state: %u, Last sent: %u\n",
990 n_ptr->bclink.last_in,
991 n_ptr->bclink.oos_state,
992 n_ptr->bclink.last_sent);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700993
Allan Stephensd356eeb2006-06-25 23:40:01 -0700994 tipc_node_unlock(n_ptr);
995
Ying Xue1da46562015-01-09 15:27:07 +0800996 tipc_bclink_set_flags(net, TIPC_BCLINK_RESET);
Allan Stephensd356eeb2006-06-25 23:40:01 -0700997 l_ptr->stale_count = 0;
998 }
999}
1000
Ying Xue58dc55f2014-11-26 11:41:52 +08001001void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb,
Per Liden4323add2006-01-18 00:38:21 +01001002 u32 retransmits)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001003{
1004 struct tipc_msg *msg;
1005
Ying Xue58dc55f2014-11-26 11:41:52 +08001006 if (!skb)
Allan Stephensd356eeb2006-06-25 23:40:01 -07001007 return;
1008
Ying Xue58dc55f2014-11-26 11:41:52 +08001009 msg = buf_msg(skb);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001010
Erik Hugne512137e2013-12-06 10:08:00 -05001011 /* Detect repeated retransmit failures */
1012 if (l_ptr->last_retransmitted == msg_seqno(msg)) {
1013 if (++l_ptr->stale_count > 100) {
Ying Xue58dc55f2014-11-26 11:41:52 +08001014 link_retransmit_failure(l_ptr, skb);
Erik Hugne512137e2013-12-06 10:08:00 -05001015 return;
Allan Stephensd356eeb2006-06-25 23:40:01 -07001016 }
1017 } else {
Erik Hugne512137e2013-12-06 10:08:00 -05001018 l_ptr->last_retransmitted = msg_seqno(msg);
1019 l_ptr->stale_count = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001020 }
Allan Stephensd356eeb2006-06-25 23:40:01 -07001021
Ying Xue58dc55f2014-11-26 11:41:52 +08001022 skb_queue_walk_from(&l_ptr->outqueue, skb) {
1023 if (!retransmits || skb == l_ptr->next_out)
1024 break;
1025 msg = buf_msg(skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001026 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001027 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Ying Xue7f9f95d2015-01-09 15:27:06 +08001028 tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb,
1029 &l_ptr->media_addr);
Ying Xue3c294cb2012-11-15 11:34:45 +08001030 retransmits--;
1031 l_ptr->stats.retransmitted++;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001032 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001033}
1034
Ying Xuef03273f2014-11-26 11:41:54 +08001035static void link_retrieve_defq(struct tipc_link *link,
1036 struct sk_buff_head *list)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001037{
1038 u32 seq_no;
1039
Ying Xuef03273f2014-11-26 11:41:54 +08001040 if (skb_queue_empty(&link->deferred_queue))
1041 return;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001042
Ying Xuef03273f2014-11-26 11:41:54 +08001043 seq_no = buf_seqno(skb_peek(&link->deferred_queue));
1044 if (seq_no == mod(link->next_in_no))
1045 skb_queue_splice_tail_init(&link->deferred_queue, list);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001046}
1047
Allan Stephens85035562008-04-15 19:04:54 -07001048/**
1049 * link_recv_buf_validate - validate basic format of received message
1050 *
1051 * This routine ensures a TIPC message has an acceptable header, and at least
1052 * as much data as the header indicates it should. The routine also ensures
1053 * that the entire message header is stored in the main fragment of the message
1054 * buffer, to simplify future access to message header fields.
1055 *
1056 * Note: Having extra info present in the message header or data areas is OK.
1057 * TIPC will ignore the excess, under the assumption that it is optional info
1058 * introduced by a later release of the protocol.
1059 */
Allan Stephens85035562008-04-15 19:04:54 -07001060static int link_recv_buf_validate(struct sk_buff *buf)
1061{
1062 static u32 min_data_hdr_size[8] = {
Allan Stephens741d9eb2011-05-31 15:03:18 -04001063 SHORT_H_SIZE, MCAST_H_SIZE, NAMED_H_SIZE, BASIC_H_SIZE,
Allan Stephens85035562008-04-15 19:04:54 -07001064 MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE
1065 };
1066
1067 struct tipc_msg *msg;
1068 u32 tipc_hdr[2];
1069 u32 size;
1070 u32 hdr_size;
1071 u32 min_hdr_size;
1072
Erik Hugne64380a02014-02-11 11:38:26 +01001073 /* If this packet comes from the defer queue, the skb has already
1074 * been validated
1075 */
1076 if (unlikely(TIPC_SKB_CB(buf)->deferred))
1077 return 1;
1078
Allan Stephens85035562008-04-15 19:04:54 -07001079 if (unlikely(buf->len < MIN_H_SIZE))
1080 return 0;
1081
1082 msg = skb_header_pointer(buf, 0, sizeof(tipc_hdr), tipc_hdr);
1083 if (msg == NULL)
1084 return 0;
1085
1086 if (unlikely(msg_version(msg) != TIPC_VERSION))
1087 return 0;
1088
1089 size = msg_size(msg);
1090 hdr_size = msg_hdr_sz(msg);
1091 min_hdr_size = msg_isdata(msg) ?
1092 min_data_hdr_size[msg_type(msg)] : INT_H_SIZE;
1093
1094 if (unlikely((hdr_size < min_hdr_size) ||
1095 (size < hdr_size) ||
1096 (buf->len < size) ||
1097 (size - hdr_size > TIPC_MAX_USER_MSG_SIZE)))
1098 return 0;
1099
1100 return pskb_may_pull(buf, hdr_size);
1101}
1102
Allan Stephensb02b69c2010-08-17 11:00:07 +00001103/**
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001104 * tipc_rcv - process TIPC packets/messages arriving from off-node
Ying Xuef2f98002015-01-09 15:27:05 +08001105 * @net: the applicable net namespace
Ying Xuef03273f2014-11-26 11:41:54 +08001106 * @skb: TIPC packet
Ying Xue7a2f7d12014-04-21 10:55:46 +08001107 * @b_ptr: pointer to bearer message arrived on
Allan Stephensb02b69c2010-08-17 11:00:07 +00001108 *
1109 * Invoked with no locks held. Bearer pointer must point to a valid bearer
1110 * structure (i.e. cannot be NULL), but bearer can be inactive.
1111 */
Ying Xuec93d3ba2015-01-09 15:27:04 +08001112void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001113{
Ying Xue34747532015-01-09 15:27:10 +08001114 struct tipc_net *tn = net_generic(net, tipc_net_id);
Ying Xuef03273f2014-11-26 11:41:54 +08001115 struct sk_buff_head head;
1116 struct tipc_node *n_ptr;
1117 struct tipc_link *l_ptr;
1118 struct sk_buff *skb1, *tmp;
1119 struct tipc_msg *msg;
1120 u32 seq_no;
1121 u32 ackd;
1122 u32 released;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001123
Ying Xuea6ca1092014-11-26 11:41:55 +08001124 skb2list(skb, &head);
Allan Stephens85035562008-04-15 19:04:54 -07001125
Ying Xuef03273f2014-11-26 11:41:54 +08001126 while ((skb = __skb_dequeue(&head))) {
Allan Stephens85035562008-04-15 19:04:54 -07001127 /* Ensure message is well-formed */
Ying Xuef03273f2014-11-26 11:41:54 +08001128 if (unlikely(!link_recv_buf_validate(skb)))
Ying Xue3af390e2013-10-30 11:26:57 +08001129 goto discard;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001130
Allan Stephensfe13dda2008-04-15 19:03:23 -07001131 /* Ensure message data is a single contiguous unit */
Ying Xuef03273f2014-11-26 11:41:54 +08001132 if (unlikely(skb_linearize(skb)))
Ying Xue3af390e2013-10-30 11:26:57 +08001133 goto discard;
Allan Stephensfe13dda2008-04-15 19:03:23 -07001134
Allan Stephens85035562008-04-15 19:04:54 -07001135 /* Handle arrival of a non-unicast link message */
Ying Xuef03273f2014-11-26 11:41:54 +08001136 msg = buf_msg(skb);
Allan Stephens85035562008-04-15 19:04:54 -07001137
Per Lidenb97bf3f2006-01-02 19:04:38 +01001138 if (unlikely(msg_non_seq(msg))) {
Allan Stephens1265a022008-06-04 17:32:35 -07001139 if (msg_user(msg) == LINK_CONFIG)
Ying Xuec93d3ba2015-01-09 15:27:04 +08001140 tipc_disc_rcv(net, skb, b_ptr);
Allan Stephens1265a022008-06-04 17:32:35 -07001141 else
Ying Xuec93d3ba2015-01-09 15:27:04 +08001142 tipc_bclink_rcv(net, skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001143 continue;
1144 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001145
Allan Stephensed33a9c2011-04-05 15:15:04 -04001146 /* Discard unicast link messages destined for another node */
Allan Stephens26008242006-06-25 23:39:31 -07001147 if (unlikely(!msg_short(msg) &&
Ying Xue34747532015-01-09 15:27:10 +08001148 (msg_destnode(msg) != tn->own_addr)))
Ying Xue3af390e2013-10-30 11:26:57 +08001149 goto discard;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001150
Allan Stephens5a68d5e2010-08-17 11:00:16 +00001151 /* Locate neighboring node that sent message */
Ying Xuef2f98002015-01-09 15:27:05 +08001152 n_ptr = tipc_node_find(net, msg_prevnode(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001153 if (unlikely(!n_ptr))
Ying Xue3af390e2013-10-30 11:26:57 +08001154 goto discard;
Per Liden4323add2006-01-18 00:38:21 +01001155 tipc_node_lock(n_ptr);
Allan Stephens85035562008-04-15 19:04:54 -07001156
Allan Stephens5a68d5e2010-08-17 11:00:16 +00001157 /* Locate unicast link endpoint that should handle message */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001158 l_ptr = n_ptr->links[b_ptr->identity];
Ying Xue3af390e2013-10-30 11:26:57 +08001159 if (unlikely(!l_ptr))
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001160 goto unlock;
Allan Stephens85035562008-04-15 19:04:54 -07001161
Allan Stephensb4b56102011-05-27 11:00:51 -04001162 /* Verify that communication with node is currently allowed */
Ying Xueaecb9bb2014-05-08 08:54:39 +08001163 if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) &&
Ying Xue10f465c2014-05-05 08:56:11 +08001164 msg_user(msg) == LINK_PROTOCOL &&
1165 (msg_type(msg) == RESET_MSG ||
1166 msg_type(msg) == ACTIVATE_MSG) &&
1167 !msg_redundant_link(msg))
Ying Xueaecb9bb2014-05-08 08:54:39 +08001168 n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN;
Allan Stephensb4b56102011-05-27 11:00:51 -04001169
Ying Xue10f465c2014-05-05 08:56:11 +08001170 if (tipc_node_blocked(n_ptr))
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001171 goto unlock;
Allan Stephensb4b56102011-05-27 11:00:51 -04001172
Allan Stephens85035562008-04-15 19:04:54 -07001173 /* Validate message sequence number info */
Allan Stephens85035562008-04-15 19:04:54 -07001174 seq_no = msg_seqno(msg);
1175 ackd = msg_ack(msg);
1176
1177 /* Release acked messages */
Ying Xue389dd9b2012-11-16 13:51:30 +08001178 if (n_ptr->bclink.recv_permitted)
Allan Stephens365595912011-10-24 15:26:24 -04001179 tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001180
Ying Xue58dc55f2014-11-26 11:41:52 +08001181 released = 0;
1182 skb_queue_walk_safe(&l_ptr->outqueue, skb1, tmp) {
1183 if (skb1 == l_ptr->next_out ||
1184 more(buf_seqno(skb1), ackd))
1185 break;
1186 __skb_unlink(skb1, &l_ptr->outqueue);
1187 kfree_skb(skb1);
1188 released = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001189 }
Allan Stephens85035562008-04-15 19:04:54 -07001190
1191 /* Try sending any messages link endpoint has pending */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001192 if (unlikely(l_ptr->next_out))
Ying Xue47b4c9a82014-11-26 11:41:48 +08001193 tipc_link_push_packets(l_ptr);
Jon Paul Maloya5377832014-02-13 17:29:15 -05001194
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001195 if (released && !skb_queue_empty(&l_ptr->wakeupq))
Jon Paul Maloy50100a52014-08-22 18:09:07 -04001196 link_prepare_wakeup(l_ptr);
Jon Paul Maloya5377832014-02-13 17:29:15 -05001197
Jon Paul Maloya5377832014-02-13 17:29:15 -05001198 /* Process the incoming packet */
Ying Xue3af390e2013-10-30 11:26:57 +08001199 if (unlikely(!link_working_working(l_ptr))) {
1200 if (msg_user(msg) == LINK_PROTOCOL) {
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001201 tipc_link_proto_rcv(l_ptr, skb);
Ying Xuef03273f2014-11-26 11:41:54 +08001202 link_retrieve_defq(l_ptr, &head);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001203 skb = NULL;
1204 goto unlock;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001205 }
Ying Xue3af390e2013-10-30 11:26:57 +08001206
1207 /* Traffic message. Conditionally activate link */
1208 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1209
1210 if (link_working_working(l_ptr)) {
1211 /* Re-insert buffer in front of queue */
Ying Xuef03273f2014-11-26 11:41:54 +08001212 __skb_queue_head(&head, skb);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001213 skb = NULL;
1214 goto unlock;
Ying Xue3af390e2013-10-30 11:26:57 +08001215 }
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001216 goto unlock;
Ying Xue3af390e2013-10-30 11:26:57 +08001217 }
1218
1219 /* Link is now in state WORKING_WORKING */
1220 if (unlikely(seq_no != mod(l_ptr->next_in_no))) {
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001221 link_handle_out_of_seq_msg(l_ptr, skb);
Ying Xuef03273f2014-11-26 11:41:54 +08001222 link_retrieve_defq(l_ptr, &head);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001223 skb = NULL;
1224 goto unlock;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001225 }
Ying Xue3af390e2013-10-30 11:26:57 +08001226 l_ptr->next_in_no++;
Ying Xuebc6fecd2014-11-26 11:41:53 +08001227 if (unlikely(!skb_queue_empty(&l_ptr->deferred_queue)))
Ying Xuef03273f2014-11-26 11:41:54 +08001228 link_retrieve_defq(l_ptr, &head);
Jon Paul Maloya5377832014-02-13 17:29:15 -05001229
Erik Hugne3f53bd82014-07-01 10:22:41 +02001230 if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
1231 l_ptr->stats.sent_acks++;
1232 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
1233 }
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001234 tipc_link_input(l_ptr, skb);
1235 skb = NULL;
1236unlock:
Ying Xue3af390e2013-10-30 11:26:57 +08001237 tipc_node_unlock(n_ptr);
1238discard:
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001239 if (unlikely(skb))
1240 kfree_skb(skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001241 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001242}
1243
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001244/* tipc_data_input - deliver data and name distr msgs to upper layer
Erik Hugne7ae934b2014-07-01 10:22:40 +02001245 *
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001246 * Consumes buffer if message is of right type
Erik Hugne7ae934b2014-07-01 10:22:40 +02001247 * Node lock must be held
1248 */
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001249static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb)
Erik Hugne7ae934b2014-07-01 10:22:40 +02001250{
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001251 struct tipc_node *node = link->owner;
1252 struct tipc_msg *msg = buf_msg(skb);
1253 u32 dport = msg_destport(msg);
Erik Hugne7ae934b2014-07-01 10:22:40 +02001254
1255 switch (msg_user(msg)) {
1256 case TIPC_LOW_IMPORTANCE:
1257 case TIPC_MEDIUM_IMPORTANCE:
1258 case TIPC_HIGH_IMPORTANCE:
1259 case TIPC_CRITICAL_IMPORTANCE:
1260 case CONN_MANAGER:
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001261 if (tipc_skb_queue_tail(&link->inputq, skb, dport)) {
1262 node->inputq = &link->inputq;
1263 node->action_flags |= TIPC_MSG_EVT;
1264 }
1265 return true;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001266 case NAME_DISTRIBUTOR:
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001267 node->bclink.recv_permitted = true;
1268 node->namedq = &link->namedq;
1269 skb_queue_tail(&link->namedq, skb);
1270 if (skb_queue_len(&link->namedq) == 1)
1271 node->action_flags |= TIPC_NAMED_MSG_EVT;
1272 return true;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001273 case MSG_BUNDLER:
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001274 case CHANGEOVER_PROTOCOL:
1275 case MSG_FRAGMENTER:
1276 case BCAST_PROTOCOL:
1277 return false;
1278 default:
1279 pr_warn("Dropping received illegal msg type\n");
1280 kfree_skb(skb);
1281 return false;
1282 };
1283}
1284
1285/* tipc_link_input - process packet that has passed link protocol check
1286 *
1287 * Consumes buffer
1288 * Node lock must be held
1289 */
1290static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb)
1291{
1292 struct tipc_node *node = link->owner;
1293 struct tipc_msg *msg = buf_msg(skb);
1294 struct sk_buff *iskb;
1295 int pos = 0;
1296
1297 if (likely(tipc_data_input(link, skb)))
1298 return;
1299
1300 switch (msg_user(msg)) {
1301 case CHANGEOVER_PROTOCOL:
1302 if (!tipc_link_tunnel_rcv(node, &skb))
1303 break;
1304 if (msg_user(buf_msg(skb)) != MSG_BUNDLER) {
1305 tipc_data_input(link, skb);
1306 break;
1307 }
1308 case MSG_BUNDLER:
1309 link->stats.recv_bundles++;
1310 link->stats.recv_bundled += msg_msgcnt(msg);
1311
1312 while (tipc_msg_extract(skb, &iskb, &pos))
1313 tipc_data_input(link, iskb);
1314 break;
1315 case MSG_FRAGMENTER:
1316 link->stats.recv_fragments++;
1317 if (tipc_buf_append(&link->reasm_buf, &skb)) {
1318 link->stats.recv_fragmented++;
1319 tipc_data_input(link, skb);
1320 } else if (!link->reasm_buf) {
1321 tipc_link_reset(link);
1322 }
1323 break;
1324 case BCAST_PROTOCOL:
1325 tipc_link_sync_rcv(node, skb);
Erik Hugne7ae934b2014-07-01 10:22:40 +02001326 break;
1327 default:
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001328 break;
1329 };
Erik Hugne7ae934b2014-07-01 10:22:40 +02001330}
1331
1332/**
Allan Stephens8809b252011-10-25 10:44:35 -04001333 * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue
1334 *
1335 * Returns increase in queue length (i.e. 0 or 1)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001336 */
Ying Xuebc6fecd2014-11-26 11:41:53 +08001337u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001338{
Ying Xuebc6fecd2014-11-26 11:41:53 +08001339 struct sk_buff *skb1;
1340 u32 seq_no = buf_seqno(skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001341
1342 /* Empty queue ? */
Ying Xuebc6fecd2014-11-26 11:41:53 +08001343 if (skb_queue_empty(list)) {
1344 __skb_queue_tail(list, skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001345 return 1;
1346 }
1347
1348 /* Last ? */
Ying Xuebc6fecd2014-11-26 11:41:53 +08001349 if (less(buf_seqno(skb_peek_tail(list)), seq_no)) {
1350 __skb_queue_tail(list, skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001351 return 1;
1352 }
1353
Allan Stephens8809b252011-10-25 10:44:35 -04001354 /* Locate insertion point in queue, then insert; discard if duplicate */
Ying Xuebc6fecd2014-11-26 11:41:53 +08001355 skb_queue_walk(list, skb1) {
1356 u32 curr_seqno = buf_seqno(skb1);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001357
Allan Stephens8809b252011-10-25 10:44:35 -04001358 if (seq_no == curr_seqno) {
Ying Xuebc6fecd2014-11-26 11:41:53 +08001359 kfree_skb(skb);
Allan Stephens8809b252011-10-25 10:44:35 -04001360 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001361 }
Allan Stephens8809b252011-10-25 10:44:35 -04001362
1363 if (less(seq_no, curr_seqno))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001364 break;
Allan Stephens8809b252011-10-25 10:44:35 -04001365 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001366
Ying Xuebc6fecd2014-11-26 11:41:53 +08001367 __skb_queue_before(list, skb1, skb);
Allan Stephens8809b252011-10-25 10:44:35 -04001368 return 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001369}
1370
Allan Stephens8809b252011-10-25 10:44:35 -04001371/*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001372 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
1373 */
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001374static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001375 struct sk_buff *buf)
1376{
Allan Stephensf9057302011-10-24 16:03:12 -04001377 u32 seq_no = buf_seqno(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001378
1379 if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001380 tipc_link_proto_rcv(l_ptr, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001381 return;
1382 }
1383
Per Lidenb97bf3f2006-01-02 19:04:38 +01001384 /* Record OOS packet arrival (force mismatch on next timeout) */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001385 l_ptr->checkpoint--;
1386
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001387 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001388 * Discard packet if a duplicate; otherwise add it to deferred queue
1389 * and notify peer of gap as per protocol specification
1390 */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001391 if (less(seq_no, mod(l_ptr->next_in_no))) {
1392 l_ptr->stats.duplicates++;
Allan Stephens5f6d9122011-11-04 13:24:29 -04001393 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001394 return;
1395 }
1396
Ying Xuebc6fecd2014-11-26 11:41:53 +08001397 if (tipc_link_defer_pkt(&l_ptr->deferred_queue, buf)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001398 l_ptr->stats.deferred_recv++;
Erik Hugne64380a02014-02-11 11:38:26 +01001399 TIPC_SKB_CB(buf)->deferred = true;
Ying Xuebc6fecd2014-11-26 11:41:53 +08001400 if ((skb_queue_len(&l_ptr->deferred_queue) % 16) == 1)
Ying Xue247f0f32014-02-18 16:06:46 +08001401 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
Ying Xuebc6fecd2014-11-26 11:41:53 +08001402 } else {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001403 l_ptr->stats.duplicates++;
Ying Xuebc6fecd2014-11-26 11:41:53 +08001404 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001405}
1406
1407/*
1408 * Send protocol message to the other endpoint.
1409 */
Ying Xue247f0f32014-02-18 16:06:46 +08001410void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
1411 u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001412{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001413 struct sk_buff *buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001414 struct tipc_msg *msg = l_ptr->pmsg;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001415 u32 msg_size = sizeof(l_ptr->proto_msg);
Allan Stephens75f0aa42011-02-28 15:30:20 -05001416 int r_flag;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001417
Ying Xue77a7e072013-12-10 20:45:44 -08001418 /* Don't send protocol message during link changeover */
1419 if (l_ptr->exp_msg_count)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001420 return;
Allan Stephensb4b56102011-05-27 11:00:51 -04001421
1422 /* Abort non-RESET send if communication with node is prohibited */
Ying Xue10f465c2014-05-05 08:56:11 +08001423 if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG))
Allan Stephensb4b56102011-05-27 11:00:51 -04001424 return;
1425
Allan Stephens92d2c902011-10-25 11:20:26 -04001426 /* Create protocol message with "out-of-sequence" sequence number */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001427 msg_set_type(msg, msg_typ);
Ying Xue7a2f7d12014-04-21 10:55:46 +08001428 msg_set_net_plane(msg, l_ptr->net_plane);
Allan Stephens7a54d4a2011-10-27 14:17:53 -04001429 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Ying Xue1da46562015-01-09 15:27:07 +08001430 msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001431
1432 if (msg_typ == STATE_MSG) {
1433 u32 next_sent = mod(l_ptr->next_out_no);
1434
Per Liden4323add2006-01-18 00:38:21 +01001435 if (!tipc_link_is_up(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001436 return;
1437 if (l_ptr->next_out)
Allan Stephensf9057302011-10-24 16:03:12 -04001438 next_sent = buf_seqno(l_ptr->next_out);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001439 msg_set_next_sent(msg, next_sent);
Ying Xuebc6fecd2014-11-26 11:41:53 +08001440 if (!skb_queue_empty(&l_ptr->deferred_queue)) {
1441 u32 rec = buf_seqno(skb_peek(&l_ptr->deferred_queue));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001442 gap = mod(rec - mod(l_ptr->next_in_no));
1443 }
1444 msg_set_seq_gap(msg, gap);
1445 if (gap)
1446 l_ptr->stats.sent_nacks++;
1447 msg_set_link_tolerance(msg, tolerance);
1448 msg_set_linkprio(msg, priority);
1449 msg_set_max_pkt(msg, ack_mtu);
1450 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1451 msg_set_probe(msg, probe_msg != 0);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001452 if (probe_msg) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001453 u32 mtu = l_ptr->max_pkt;
1454
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001455 if ((mtu < l_ptr->max_pkt_target) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01001456 link_working_working(l_ptr) &&
1457 l_ptr->fsm_msg_cnt) {
1458 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001459 if (l_ptr->max_pkt_probes == 10) {
1460 l_ptr->max_pkt_target = (msg_size - 4);
1461 l_ptr->max_pkt_probes = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001462 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001463 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001464 l_ptr->max_pkt_probes++;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001465 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001466
1467 l_ptr->stats.sent_probes++;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001468 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001469 l_ptr->stats.sent_states++;
1470 } else { /* RESET_MSG or ACTIVATE_MSG */
1471 msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1));
1472 msg_set_seq_gap(msg, 0);
1473 msg_set_next_sent(msg, 1);
Allan Stephensf23d9bf2011-01-18 15:15:34 -05001474 msg_set_probe(msg, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001475 msg_set_link_tolerance(msg, l_ptr->tolerance);
1476 msg_set_linkprio(msg, l_ptr->priority);
1477 msg_set_max_pkt(msg, l_ptr->max_pkt_target);
1478 }
1479
Allan Stephens75f0aa42011-02-28 15:30:20 -05001480 r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr));
1481 msg_set_redundant_link(msg, r_flag);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001482 msg_set_linkprio(msg, l_ptr->priority);
Allan Stephens92d2c902011-10-25 11:20:26 -04001483 msg_set_size(msg, msg_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001484
1485 msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
1486
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001487 buf = tipc_buf_acquire(msg_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001488 if (!buf)
1489 return;
1490
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001491 skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
Ying Xue796c75d2013-06-17 10:54:48 -04001492 buf->priority = TC_PRIO_CONTROL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001493
Ying Xue7f9f95d2015-01-09 15:27:06 +08001494 tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf,
1495 &l_ptr->media_addr);
Allan Stephens92d2c902011-10-25 11:20:26 -04001496 l_ptr->unacked_window = 0;
Allan Stephens5f6d9122011-11-04 13:24:29 -04001497 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001498}
1499
1500/*
1501 * Receive protocol message :
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001502 * Note that network plane id propagates through the network, and may
1503 * change at any time. The node with lowest address rules
Per Lidenb97bf3f2006-01-02 19:04:38 +01001504 */
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001505static void tipc_link_proto_rcv(struct tipc_link *l_ptr,
Ying Xuec93d3ba2015-01-09 15:27:04 +08001506 struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001507{
1508 u32 rec_gap = 0;
1509 u32 max_pkt_info;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001510 u32 max_pkt_ack;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001511 u32 msg_tol;
1512 struct tipc_msg *msg = buf_msg(buf);
1513
Ying Xue77a7e072013-12-10 20:45:44 -08001514 /* Discard protocol message during link changeover */
1515 if (l_ptr->exp_msg_count)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001516 goto exit;
1517
Ying Xue7a2f7d12014-04-21 10:55:46 +08001518 if (l_ptr->net_plane != msg_net_plane(msg))
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001519 if (link_own_addr(l_ptr) > msg_prevnode(msg))
Ying Xue7a2f7d12014-04-21 10:55:46 +08001520 l_ptr->net_plane = msg_net_plane(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001521
Per Lidenb97bf3f2006-01-02 19:04:38 +01001522 switch (msg_type(msg)) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001523
Per Lidenb97bf3f2006-01-02 19:04:38 +01001524 case RESET_MSG:
Allan Stephensa686e682008-06-04 17:29:39 -07001525 if (!link_working_unknown(l_ptr) &&
1526 (l_ptr->peer_session != INVALID_SESSION)) {
Allan Stephens641c2182011-04-07 09:54:43 -04001527 if (less_eq(msg_session(msg), l_ptr->peer_session))
1528 break; /* duplicate or old reset: ignore */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001529 }
Allan Stephensb4b56102011-05-27 11:00:51 -04001530
1531 if (!msg_redundant_link(msg) && (link_working_working(l_ptr) ||
1532 link_working_unknown(l_ptr))) {
1533 /*
1534 * peer has lost contact -- don't allow peer's links
1535 * to reactivate before we recognize loss & clean up
1536 */
Ying Xueca9cf062014-05-08 08:54:40 +08001537 l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN;
Allan Stephensb4b56102011-05-27 11:00:51 -04001538 }
1539
Allan Stephens47361c82011-10-26 10:55:16 -04001540 link_state_event(l_ptr, RESET_MSG);
1541
Per Lidenb97bf3f2006-01-02 19:04:38 +01001542 /* fall thru' */
1543 case ACTIVATE_MSG:
1544 /* Update link settings according other endpoint's values */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001545 strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
1546
Allan Stephens2db99832010-12-31 18:59:33 +00001547 msg_tol = msg_link_tolerance(msg);
1548 if (msg_tol > l_ptr->tolerance)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001549 link_set_supervision_props(l_ptr, msg_tol);
1550
1551 if (msg_linkprio(msg) > l_ptr->priority)
1552 l_ptr->priority = msg_linkprio(msg);
1553
1554 max_pkt_info = msg_max_pkt(msg);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001555 if (max_pkt_info) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001556 if (max_pkt_info < l_ptr->max_pkt_target)
1557 l_ptr->max_pkt_target = max_pkt_info;
1558 if (l_ptr->max_pkt > l_ptr->max_pkt_target)
1559 l_ptr->max_pkt = l_ptr->max_pkt_target;
1560 } else {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001561 l_ptr->max_pkt = l_ptr->max_pkt_target;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001562 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001563
Allan Stephens4d753132011-10-25 12:19:05 -04001564 /* Synchronize broadcast link info, if not done previously */
Allan Stephens7a54d4a2011-10-27 14:17:53 -04001565 if (!tipc_node_is_up(l_ptr->owner)) {
1566 l_ptr->owner->bclink.last_sent =
1567 l_ptr->owner->bclink.last_in =
1568 msg_last_bcast(msg);
1569 l_ptr->owner->bclink.oos_state = 0;
1570 }
Allan Stephens4d753132011-10-25 12:19:05 -04001571
Per Lidenb97bf3f2006-01-02 19:04:38 +01001572 l_ptr->peer_session = msg_session(msg);
1573 l_ptr->peer_bearer_id = msg_bearer_id(msg);
Allan Stephens47361c82011-10-26 10:55:16 -04001574
1575 if (msg_type(msg) == ACTIVATE_MSG)
1576 link_state_event(l_ptr, ACTIVATE_MSG);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001577 break;
1578 case STATE_MSG:
1579
Allan Stephens2db99832010-12-31 18:59:33 +00001580 msg_tol = msg_link_tolerance(msg);
1581 if (msg_tol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001582 link_set_supervision_props(l_ptr, msg_tol);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001583
1584 if (msg_linkprio(msg) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01001585 (msg_linkprio(msg) != l_ptr->priority)) {
Erik Hugne3fa9cac2015-01-22 17:10:31 +01001586 pr_debug("%s<%s>, priority change %u->%u\n",
1587 link_rst_msg, l_ptr->name,
1588 l_ptr->priority, msg_linkprio(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001589 l_ptr->priority = msg_linkprio(msg);
Per Liden4323add2006-01-18 00:38:21 +01001590 tipc_link_reset(l_ptr); /* Enforce change to take effect */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001591 break;
1592 }
Jon Paul Maloyec37dcd2014-05-14 05:39:10 -04001593
1594 /* Record reception; force mismatch at next timeout: */
1595 l_ptr->checkpoint--;
1596
Per Lidenb97bf3f2006-01-02 19:04:38 +01001597 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1598 l_ptr->stats.recv_states++;
1599 if (link_reset_unknown(l_ptr))
1600 break;
1601
1602 if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001603 rec_gap = mod(msg_next_sent(msg) -
Per Lidenb97bf3f2006-01-02 19:04:38 +01001604 mod(l_ptr->next_in_no));
1605 }
1606
1607 max_pkt_ack = msg_max_pkt(msg);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001608 if (max_pkt_ack > l_ptr->max_pkt) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001609 l_ptr->max_pkt = max_pkt_ack;
1610 l_ptr->max_pkt_probes = 0;
1611 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001612
1613 max_pkt_ack = 0;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001614 if (msg_probe(msg)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001615 l_ptr->stats.recv_probes++;
Allan Stephensa0168922010-12-31 18:59:35 +00001616 if (msg_size(msg) > sizeof(l_ptr->proto_msg))
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001617 max_pkt_ack = msg_size(msg);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001618 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001619
1620 /* Protocol message before retransmits, reduce loss risk */
Ying Xue389dd9b2012-11-16 13:51:30 +08001621 if (l_ptr->owner->bclink.recv_permitted)
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001622 tipc_bclink_update_link_state(l_ptr->owner,
Allan Stephens7a54d4a2011-10-27 14:17:53 -04001623 msg_last_bcast(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001624
1625 if (rec_gap || (msg_probe(msg))) {
Ying Xue247f0f32014-02-18 16:06:46 +08001626 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, rec_gap, 0,
1627 0, max_pkt_ack);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001628 }
1629 if (msg_seq_gap(msg)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001630 l_ptr->stats.recv_nacks++;
Ying Xue58dc55f2014-11-26 11:41:52 +08001631 tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->outqueue),
Per Liden4323add2006-01-18 00:38:21 +01001632 msg_seq_gap(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001633 }
1634 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001635 }
1636exit:
Allan Stephens5f6d9122011-11-04 13:24:29 -04001637 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001638}
1639
1640
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001641/* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to
1642 * a different bearer. Owner node is locked.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001643 */
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001644static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr,
1645 struct tipc_msg *tunnel_hdr,
1646 struct tipc_msg *msg,
1647 u32 selector)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001648{
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001649 struct tipc_link *tunnel;
Ying Xuea6ca1092014-11-26 11:41:55 +08001650 struct sk_buff *skb;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001651 u32 length = msg_size(msg);
1652
1653 tunnel = l_ptr->owner->active_links[selector & 1];
Allan Stephens5392d642006-06-25 23:52:50 -07001654 if (!tipc_link_is_up(tunnel)) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04001655 pr_warn("%stunnel link no longer available\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001656 return;
Allan Stephens5392d642006-06-25 23:52:50 -07001657 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001658 msg_set_size(tunnel_hdr, length + INT_H_SIZE);
Ying Xuea6ca1092014-11-26 11:41:55 +08001659 skb = tipc_buf_acquire(length + INT_H_SIZE);
1660 if (!skb) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04001661 pr_warn("%sunable to send tunnel msg\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001662 return;
Allan Stephens5392d642006-06-25 23:52:50 -07001663 }
Ying Xuea6ca1092014-11-26 11:41:55 +08001664 skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE);
1665 skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length);
1666 __tipc_link_xmit_skb(tunnel, skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001667}
1668
1669
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001670/* tipc_link_failover_send_queue(): A link has gone down, but a second
1671 * link is still active. We can do failover. Tunnel the failing link's
1672 * whole send queue via the remaining link. This way, we don't lose
1673 * any packets, and sequence order is preserved for subsequent traffic
1674 * sent over the remaining link. Owner node is locked.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001675 */
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001676void tipc_link_failover_send_queue(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001677{
Ying Xue58dc55f2014-11-26 11:41:52 +08001678 u32 msgcount = skb_queue_len(&l_ptr->outqueue);
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001679 struct tipc_link *tunnel = l_ptr->owner->active_links[0];
Per Lidenb97bf3f2006-01-02 19:04:38 +01001680 struct tipc_msg tunnel_hdr;
Ying Xue58dc55f2014-11-26 11:41:52 +08001681 struct sk_buff *skb;
Allan Stephens5392d642006-06-25 23:52:50 -07001682 int split_bundles;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001683
1684 if (!tunnel)
1685 return;
1686
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001687 tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, CHANGEOVER_PROTOCOL,
Ying Xue34747532015-01-09 15:27:10 +08001688 ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001689 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
1690 msg_set_msgcnt(&tunnel_hdr, msgcount);
Allan Stephensf131072c2006-06-25 23:51:37 -07001691
Ying Xue58dc55f2014-11-26 11:41:52 +08001692 if (skb_queue_empty(&l_ptr->outqueue)) {
1693 skb = tipc_buf_acquire(INT_H_SIZE);
1694 if (skb) {
1695 skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001696 msg_set_size(&tunnel_hdr, INT_H_SIZE);
Ying Xuea6ca1092014-11-26 11:41:55 +08001697 __tipc_link_xmit_skb(tunnel, skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001698 } else {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04001699 pr_warn("%sunable to send changeover msg\n",
1700 link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001701 }
1702 return;
1703 }
Allan Stephensf131072c2006-06-25 23:51:37 -07001704
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001705 split_bundles = (l_ptr->owner->active_links[0] !=
Allan Stephens5392d642006-06-25 23:52:50 -07001706 l_ptr->owner->active_links[1]);
1707
Ying Xue58dc55f2014-11-26 11:41:52 +08001708 skb_queue_walk(&l_ptr->outqueue, skb) {
1709 struct tipc_msg *msg = buf_msg(skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001710
1711 if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001712 struct tipc_msg *m = msg_get_wrapped(msg);
Allan Stephens0e659672010-12-31 18:59:32 +00001713 unchar *pos = (unchar *)m;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001714
Florian Westphald788d802007-08-02 19:28:06 -07001715 msgcount = msg_msgcnt(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001716 while (msgcount--) {
Allan Stephens0e659672010-12-31 18:59:32 +00001717 msg_set_seqno(m, msg_seqno(msg));
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001718 tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m,
1719 msg_link_selector(m));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001720 pos += align(msg_size(m));
1721 m = (struct tipc_msg *)pos;
1722 }
1723 } else {
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001724 tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg,
1725 msg_link_selector(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001726 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001727 }
1728}
1729
Ying Xue247f0f32014-02-18 16:06:46 +08001730/* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001731 * duplicate of the first link's send queue via the new link. This way, we
1732 * are guaranteed that currently queued packets from a socket are delivered
1733 * before future traffic from the same socket, even if this is using the
1734 * new link. The last arriving copy of each duplicate packet is dropped at
1735 * the receiving end by the regular protocol check, so packet cardinality
1736 * and sequence order is preserved per sender/receiver socket pair.
1737 * Owner node is locked.
1738 */
Ying Xue247f0f32014-02-18 16:06:46 +08001739void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr,
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001740 struct tipc_link *tunnel)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001741{
Ying Xue58dc55f2014-11-26 11:41:52 +08001742 struct sk_buff *skb;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001743 struct tipc_msg tunnel_hdr;
1744
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001745 tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, CHANGEOVER_PROTOCOL,
Ying Xue34747532015-01-09 15:27:10 +08001746 DUPLICATE_MSG, INT_H_SIZE, l_ptr->addr);
Ying Xue58dc55f2014-11-26 11:41:52 +08001747 msg_set_msgcnt(&tunnel_hdr, skb_queue_len(&l_ptr->outqueue));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001748 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
Ying Xue58dc55f2014-11-26 11:41:52 +08001749 skb_queue_walk(&l_ptr->outqueue, skb) {
1750 struct sk_buff *outskb;
1751 struct tipc_msg *msg = buf_msg(skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001752 u32 length = msg_size(msg);
1753
1754 if (msg_user(msg) == MSG_BUNDLER)
1755 msg_set_type(msg, CLOSED_MSG);
1756 msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001757 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001758 msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
Ying Xue58dc55f2014-11-26 11:41:52 +08001759 outskb = tipc_buf_acquire(length + INT_H_SIZE);
1760 if (outskb == NULL) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04001761 pr_warn("%sunable to send duplicate msg\n",
1762 link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001763 return;
1764 }
Ying Xue58dc55f2014-11-26 11:41:52 +08001765 skb_copy_to_linear_data(outskb, &tunnel_hdr, INT_H_SIZE);
1766 skb_copy_to_linear_data_offset(outskb, INT_H_SIZE, skb->data,
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001767 length);
Ying Xuea6ca1092014-11-26 11:41:55 +08001768 __tipc_link_xmit_skb(tunnel, outskb);
Per Liden4323add2006-01-18 00:38:21 +01001769 if (!tipc_link_is_up(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001770 return;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001771 }
1772}
1773
Per Lidenb97bf3f2006-01-02 19:04:38 +01001774/**
1775 * buf_extract - extracts embedded TIPC message from another message
1776 * @skb: encapsulating message buffer
1777 * @from_pos: offset to extract from
1778 *
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001779 * Returns a new message buffer containing an embedded message. The
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001780 * encapsulating buffer is left unchanged.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001781 */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001782static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)
1783{
1784 struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos);
1785 u32 size = msg_size(msg);
1786 struct sk_buff *eb;
1787
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001788 eb = tipc_buf_acquire(size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001789 if (eb)
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001790 skb_copy_to_linear_data(eb, msg, size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001791 return eb;
1792}
1793
Jon Paul Maloy1dab3d52014-02-13 17:29:10 -05001794/* tipc_link_dup_rcv(): Receive a tunnelled DUPLICATE_MSG packet.
1795 * Owner node is locked.
1796 */
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001797static void tipc_link_dup_rcv(struct tipc_link *l_ptr,
Jon Paul Maloy1dab3d52014-02-13 17:29:10 -05001798 struct sk_buff *t_buf)
1799{
1800 struct sk_buff *buf;
1801
1802 if (!tipc_link_is_up(l_ptr))
1803 return;
1804
1805 buf = buf_extract(t_buf, INT_H_SIZE);
1806 if (buf == NULL) {
1807 pr_warn("%sfailed to extract inner dup pkt\n", link_co_err);
1808 return;
1809 }
1810
1811 /* Add buffer to deferred queue, if applicable: */
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001812 link_handle_out_of_seq_msg(l_ptr, buf);
Jon Paul Maloy1dab3d52014-02-13 17:29:10 -05001813}
1814
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001815/* tipc_link_failover_rcv(): Receive a tunnelled ORIGINAL_MSG packet
1816 * Owner node is locked.
1817 */
1818static struct sk_buff *tipc_link_failover_rcv(struct tipc_link *l_ptr,
1819 struct sk_buff *t_buf)
1820{
1821 struct tipc_msg *t_msg = buf_msg(t_buf);
1822 struct sk_buff *buf = NULL;
1823 struct tipc_msg *msg;
1824
1825 if (tipc_link_is_up(l_ptr))
1826 tipc_link_reset(l_ptr);
1827
1828 /* First failover packet? */
1829 if (l_ptr->exp_msg_count == START_CHANGEOVER)
1830 l_ptr->exp_msg_count = msg_msgcnt(t_msg);
1831
1832 /* Should there be an inner packet? */
1833 if (l_ptr->exp_msg_count) {
1834 l_ptr->exp_msg_count--;
1835 buf = buf_extract(t_buf, INT_H_SIZE);
1836 if (buf == NULL) {
1837 pr_warn("%sno inner failover pkt\n", link_co_err);
1838 goto exit;
1839 }
1840 msg = buf_msg(buf);
1841
1842 if (less(msg_seqno(msg), l_ptr->reset_checkpoint)) {
1843 kfree_skb(buf);
1844 buf = NULL;
1845 goto exit;
1846 }
1847 if (msg_user(msg) == MSG_FRAGMENTER) {
1848 l_ptr->stats.recv_fragments++;
Jon Paul Maloy37e22162014-05-14 05:39:12 -04001849 tipc_buf_append(&l_ptr->reasm_buf, &buf);
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001850 }
1851 }
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001852exit:
Jon Paul Maloy2d72d492015-02-03 08:59:17 -05001853 if ((!l_ptr->exp_msg_count) && (l_ptr->flags & LINK_STOPPED))
1854 tipc_link_delete(l_ptr);
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05001855 return buf;
1856}
1857
Jon Paul Maloy1dab3d52014-02-13 17:29:10 -05001858/* tipc_link_tunnel_rcv(): Receive a tunnelled packet, sent
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001859 * via other link as result of a failover (ORIGINAL_MSG) or
1860 * a new active link (DUPLICATE_MSG). Failover packets are
1861 * returned to the active link for delivery upwards.
1862 * Owner node is locked.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001863 */
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001864static int tipc_link_tunnel_rcv(struct tipc_node *n_ptr,
Jon Paul Maloy170b3922014-01-07 17:02:41 -05001865 struct sk_buff **buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001866{
Jon Paul Maloy02842f72014-02-13 17:29:14 -05001867 struct sk_buff *t_buf = *buf;
1868 struct tipc_link *l_ptr;
1869 struct tipc_msg *t_msg = buf_msg(t_buf);
1870 u32 bearer_id = msg_bearer_id(t_msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001871
Jon Paul Maloy1e9d47a2014-02-13 17:29:13 -05001872 *buf = NULL;
1873
Dan Carpentercb4b102f2013-05-06 08:28:41 +00001874 if (bearer_id >= MAX_BEARERS)
1875 goto exit;
Jon Paul Maloy1dab3d52014-02-13 17:29:10 -05001876
Jon Paul Maloy02842f72014-02-13 17:29:14 -05001877 l_ptr = n_ptr->links[bearer_id];
1878 if (!l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001879 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001880
Jon Paul Maloy02842f72014-02-13 17:29:14 -05001881 if (msg_type(t_msg) == DUPLICATE_MSG)
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001882 tipc_link_dup_rcv(l_ptr, t_buf);
Jon Paul Maloy02842f72014-02-13 17:29:14 -05001883 else if (msg_type(t_msg) == ORIGINAL_MSG)
1884 *buf = tipc_link_failover_rcv(l_ptr, t_buf);
Jon Paul Maloy1e9d47a2014-02-13 17:29:13 -05001885 else
1886 pr_warn("%sunknown tunnel pkt received\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001887exit:
Jon Paul Maloy02842f72014-02-13 17:29:14 -05001888 kfree_skb(t_buf);
Jon Paul Maloy1e9d47a2014-02-13 17:29:13 -05001889 return *buf != NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001890}
1891
Ying Xue2f55c432015-01-09 15:27:00 +08001892static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001893{
Ying Xue2f55c432015-01-09 15:27:00 +08001894 unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
1895
1896 if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
Allan Stephens5413b4c2011-01-18 13:24:55 -05001897 return;
1898
Ying Xue2f55c432015-01-09 15:27:00 +08001899 l_ptr->tolerance = tol;
1900 l_ptr->cont_intv = msecs_to_jiffies(intv);
1901 l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->cont_intv) / 4);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001902}
1903
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001904void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001905{
1906 /* Data messages from this node, inclusive FIRST_FRAGM */
Allan Stephens06d82c92008-03-06 15:06:55 -08001907 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE] = window;
1908 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE] = (window / 3) * 4;
1909 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE] = (window / 3) * 5;
1910 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE] = (window / 3) * 6;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001911 /* Transiting data messages,inclusive FIRST_FRAGM */
Allan Stephens06d82c92008-03-06 15:06:55 -08001912 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE + 4] = 300;
1913 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE + 4] = 600;
1914 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE + 4] = 900;
1915 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE + 4] = 1200;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001916 l_ptr->queue_limit[CONN_MANAGER] = 1200;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001917 l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;
1918 l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000;
1919 /* FRAGMENT and LAST_FRAGMENT packets */
1920 l_ptr->queue_limit[MSG_FRAGMENTER] = 4000;
1921}
1922
Jon Paul Maloye099e862014-02-13 17:29:18 -05001923/* tipc_link_find_owner - locate owner node of link by link's name
Ying Xuef2f98002015-01-09 15:27:05 +08001924 * @net: the applicable net namespace
Jon Paul Maloye099e862014-02-13 17:29:18 -05001925 * @name: pointer to link name string
1926 * @bearer_id: pointer to index in 'node->links' array where the link was found.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001927 *
Jon Paul Maloye099e862014-02-13 17:29:18 -05001928 * Returns pointer to node owning the link, or 0 if no matching link is found.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001929 */
Ying Xuef2f98002015-01-09 15:27:05 +08001930static struct tipc_node *tipc_link_find_owner(struct net *net,
1931 const char *link_name,
Jon Paul Maloye099e862014-02-13 17:29:18 -05001932 unsigned int *bearer_id)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001933{
Ying Xuef2f98002015-01-09 15:27:05 +08001934 struct tipc_net *tn = net_generic(net, tipc_net_id);
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001935 struct tipc_link *l_ptr;
Erik Hugnebbfbe472013-10-18 07:23:21 +02001936 struct tipc_node *n_ptr;
Fabian Frederick886eaa12014-12-25 12:05:50 +01001937 struct tipc_node *found_node = NULL;
Erik Hugnebbfbe472013-10-18 07:23:21 +02001938 int i;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001939
Jon Paul Maloye099e862014-02-13 17:29:18 -05001940 *bearer_id = 0;
Ying Xue6c7a7622014-03-27 12:54:37 +08001941 rcu_read_lock();
Ying Xuef2f98002015-01-09 15:27:05 +08001942 list_for_each_entry_rcu(n_ptr, &tn->node_list, list) {
Jon Paul Maloya11607f2014-02-14 16:40:44 -05001943 tipc_node_lock(n_ptr);
Erik Hugnebbfbe472013-10-18 07:23:21 +02001944 for (i = 0; i < MAX_BEARERS; i++) {
1945 l_ptr = n_ptr->links[i];
Jon Paul Maloye099e862014-02-13 17:29:18 -05001946 if (l_ptr && !strcmp(l_ptr->name, link_name)) {
1947 *bearer_id = i;
1948 found_node = n_ptr;
1949 break;
1950 }
Erik Hugnebbfbe472013-10-18 07:23:21 +02001951 }
Jon Paul Maloya11607f2014-02-14 16:40:44 -05001952 tipc_node_unlock(n_ptr);
Jon Paul Maloye099e862014-02-13 17:29:18 -05001953 if (found_node)
1954 break;
Erik Hugnebbfbe472013-10-18 07:23:21 +02001955 }
Ying Xue6c7a7622014-03-27 12:54:37 +08001956 rcu_read_unlock();
1957
Jon Paul Maloye099e862014-02-13 17:29:18 -05001958 return found_node;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001959}
1960
Allan Stephens5c216e12011-10-18 11:34:29 -04001961/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001962 * link_reset_statistics - reset link statistics
1963 * @l_ptr: pointer to link
1964 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001965static void link_reset_statistics(struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001966{
1967 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
1968 l_ptr->stats.sent_info = l_ptr->next_out_no;
1969 l_ptr->stats.recv_info = l_ptr->next_in_no;
1970}
1971
Paul Gortmakera18c4bc2011-12-29 20:58:42 -05001972static void link_print(struct tipc_link *l_ptr, const char *str)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001973{
Ying Xue7f9f95d2015-01-09 15:27:06 +08001974 struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id);
Ying Xue7a2f7d12014-04-21 10:55:46 +08001975 struct tipc_bearer *b_ptr;
1976
1977 rcu_read_lock();
Ying Xue7f9f95d2015-01-09 15:27:06 +08001978 b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]);
Ying Xue7a2f7d12014-04-21 10:55:46 +08001979 if (b_ptr)
1980 pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name);
1981 rcu_read_unlock();
Allan Stephens8d64a5b2010-12-31 18:59:27 +00001982
Per Lidenb97bf3f2006-01-02 19:04:38 +01001983 if (link_working_unknown(l_ptr))
Paul Gortmaker5deedde2012-07-11 19:27:56 -04001984 pr_cont(":WU\n");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00001985 else if (link_reset_reset(l_ptr))
Paul Gortmaker5deedde2012-07-11 19:27:56 -04001986 pr_cont(":RR\n");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00001987 else if (link_reset_unknown(l_ptr))
Paul Gortmaker5deedde2012-07-11 19:27:56 -04001988 pr_cont(":RU\n");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00001989 else if (link_working_working(l_ptr))
Paul Gortmaker5deedde2012-07-11 19:27:56 -04001990 pr_cont(":WW\n");
1991 else
1992 pr_cont("\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01001993}
Richard Alpe0655f6a2014-11-20 10:29:07 +01001994
1995/* Parse and validate nested (link) properties valid for media, bearer and link
1996 */
1997int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
1998{
1999 int err;
2000
2001 err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop,
2002 tipc_nl_prop_policy);
2003 if (err)
2004 return err;
2005
2006 if (props[TIPC_NLA_PROP_PRIO]) {
2007 u32 prio;
2008
2009 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2010 if (prio > TIPC_MAX_LINK_PRI)
2011 return -EINVAL;
2012 }
2013
2014 if (props[TIPC_NLA_PROP_TOL]) {
2015 u32 tol;
2016
2017 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2018 if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
2019 return -EINVAL;
2020 }
2021
2022 if (props[TIPC_NLA_PROP_WIN]) {
2023 u32 win;
2024
2025 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2026 if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN))
2027 return -EINVAL;
2028 }
2029
2030 return 0;
2031}
Richard Alpe7be57fc2014-11-20 10:29:12 +01002032
Richard Alpef96ce7a2014-11-20 10:29:13 +01002033int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info)
2034{
2035 int err;
2036 int res = 0;
2037 int bearer_id;
2038 char *name;
2039 struct tipc_link *link;
2040 struct tipc_node *node;
2041 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
Richard Alpe37e2d482015-02-09 09:50:08 +01002042 struct net *net = sock_net(skb->sk);
Richard Alpef96ce7a2014-11-20 10:29:13 +01002043
2044 if (!info->attrs[TIPC_NLA_LINK])
2045 return -EINVAL;
2046
2047 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
2048 info->attrs[TIPC_NLA_LINK],
2049 tipc_nl_link_policy);
2050 if (err)
2051 return err;
2052
2053 if (!attrs[TIPC_NLA_LINK_NAME])
2054 return -EINVAL;
2055
2056 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2057
Ying Xuef2f98002015-01-09 15:27:05 +08002058 node = tipc_link_find_owner(net, name, &bearer_id);
Richard Alpef96ce7a2014-11-20 10:29:13 +01002059 if (!node)
2060 return -EINVAL;
2061
2062 tipc_node_lock(node);
2063
2064 link = node->links[bearer_id];
2065 if (!link) {
2066 res = -EINVAL;
2067 goto out;
2068 }
2069
2070 if (attrs[TIPC_NLA_LINK_PROP]) {
2071 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
2072
2073 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
2074 props);
2075 if (err) {
2076 res = err;
2077 goto out;
2078 }
2079
2080 if (props[TIPC_NLA_PROP_TOL]) {
2081 u32 tol;
2082
2083 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2084 link_set_supervision_props(link, tol);
2085 tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0, 0);
2086 }
2087 if (props[TIPC_NLA_PROP_PRIO]) {
2088 u32 prio;
2089
2090 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2091 link->priority = prio;
2092 tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio, 0);
2093 }
2094 if (props[TIPC_NLA_PROP_WIN]) {
2095 u32 win;
2096
2097 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2098 tipc_link_set_queue_limits(link, win);
2099 }
2100 }
2101
2102out:
2103 tipc_node_unlock(node);
2104
2105 return res;
2106}
Richard Alped8182802014-11-24 11:10:29 +01002107
2108static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
Richard Alpe7be57fc2014-11-20 10:29:12 +01002109{
2110 int i;
2111 struct nlattr *stats;
2112
2113 struct nla_map {
2114 u32 key;
2115 u32 val;
2116 };
2117
2118 struct nla_map map[] = {
2119 {TIPC_NLA_STATS_RX_INFO, s->recv_info},
2120 {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments},
2121 {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented},
2122 {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles},
2123 {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled},
2124 {TIPC_NLA_STATS_TX_INFO, s->sent_info},
2125 {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments},
2126 {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented},
2127 {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles},
2128 {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled},
2129 {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ?
2130 s->msg_length_counts : 1},
2131 {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts},
2132 {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total},
2133 {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]},
2134 {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]},
2135 {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]},
2136 {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]},
2137 {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]},
2138 {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]},
2139 {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]},
2140 {TIPC_NLA_STATS_RX_STATES, s->recv_states},
2141 {TIPC_NLA_STATS_RX_PROBES, s->recv_probes},
2142 {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks},
2143 {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv},
2144 {TIPC_NLA_STATS_TX_STATES, s->sent_states},
2145 {TIPC_NLA_STATS_TX_PROBES, s->sent_probes},
2146 {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks},
2147 {TIPC_NLA_STATS_TX_ACKS, s->sent_acks},
2148 {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted},
2149 {TIPC_NLA_STATS_DUPLICATES, s->duplicates},
2150 {TIPC_NLA_STATS_LINK_CONGS, s->link_congs},
2151 {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz},
2152 {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ?
2153 (s->accu_queue_sz / s->queue_sz_counts) : 0}
2154 };
2155
2156 stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
2157 if (!stats)
2158 return -EMSGSIZE;
2159
2160 for (i = 0; i < ARRAY_SIZE(map); i++)
2161 if (nla_put_u32(skb, map[i].key, map[i].val))
2162 goto msg_full;
2163
2164 nla_nest_end(skb, stats);
2165
2166 return 0;
2167msg_full:
2168 nla_nest_cancel(skb, stats);
2169
2170 return -EMSGSIZE;
2171}
2172
2173/* Caller should hold appropriate locks to protect the link */
Ying Xue34747532015-01-09 15:27:10 +08002174static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
2175 struct tipc_link *link)
Richard Alpe7be57fc2014-11-20 10:29:12 +01002176{
2177 int err;
2178 void *hdr;
2179 struct nlattr *attrs;
2180 struct nlattr *prop;
Ying Xue34747532015-01-09 15:27:10 +08002181 struct tipc_net *tn = net_generic(net, tipc_net_id);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002182
Richard Alpebfb3e5d2015-02-09 09:50:03 +01002183 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
Richard Alpe7be57fc2014-11-20 10:29:12 +01002184 NLM_F_MULTI, TIPC_NL_LINK_GET);
2185 if (!hdr)
2186 return -EMSGSIZE;
2187
2188 attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
2189 if (!attrs)
2190 goto msg_full;
2191
2192 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name))
2193 goto attr_msg_full;
2194 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST,
Ying Xue34747532015-01-09 15:27:10 +08002195 tipc_cluster_mask(tn->own_addr)))
Richard Alpe7be57fc2014-11-20 10:29:12 +01002196 goto attr_msg_full;
2197 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->max_pkt))
2198 goto attr_msg_full;
2199 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no))
2200 goto attr_msg_full;
2201 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->next_out_no))
2202 goto attr_msg_full;
2203
2204 if (tipc_link_is_up(link))
2205 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
2206 goto attr_msg_full;
2207 if (tipc_link_is_active(link))
2208 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE))
2209 goto attr_msg_full;
2210
2211 prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
2212 if (!prop)
2213 goto attr_msg_full;
2214 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
2215 goto prop_msg_full;
2216 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance))
2217 goto prop_msg_full;
2218 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN,
2219 link->queue_limit[TIPC_LOW_IMPORTANCE]))
2220 goto prop_msg_full;
2221 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
2222 goto prop_msg_full;
2223 nla_nest_end(msg->skb, prop);
2224
2225 err = __tipc_nl_add_stats(msg->skb, &link->stats);
2226 if (err)
2227 goto attr_msg_full;
2228
2229 nla_nest_end(msg->skb, attrs);
2230 genlmsg_end(msg->skb, hdr);
2231
2232 return 0;
2233
2234prop_msg_full:
2235 nla_nest_cancel(msg->skb, prop);
2236attr_msg_full:
2237 nla_nest_cancel(msg->skb, attrs);
2238msg_full:
2239 genlmsg_cancel(msg->skb, hdr);
2240
2241 return -EMSGSIZE;
2242}
2243
2244/* Caller should hold node lock */
Ying Xue34747532015-01-09 15:27:10 +08002245static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
2246 struct tipc_node *node, u32 *prev_link)
Richard Alpe7be57fc2014-11-20 10:29:12 +01002247{
2248 u32 i;
2249 int err;
2250
2251 for (i = *prev_link; i < MAX_BEARERS; i++) {
2252 *prev_link = i;
2253
2254 if (!node->links[i])
2255 continue;
2256
Ying Xue34747532015-01-09 15:27:10 +08002257 err = __tipc_nl_add_link(net, msg, node->links[i]);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002258 if (err)
2259 return err;
2260 }
2261 *prev_link = 0;
2262
2263 return 0;
2264}
2265
2266int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb)
2267{
Ying Xuef2f98002015-01-09 15:27:05 +08002268 struct net *net = sock_net(skb->sk);
2269 struct tipc_net *tn = net_generic(net, tipc_net_id);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002270 struct tipc_node *node;
2271 struct tipc_nl_msg msg;
2272 u32 prev_node = cb->args[0];
2273 u32 prev_link = cb->args[1];
2274 int done = cb->args[2];
2275 int err;
2276
2277 if (done)
2278 return 0;
2279
2280 msg.skb = skb;
2281 msg.portid = NETLINK_CB(cb->skb).portid;
2282 msg.seq = cb->nlh->nlmsg_seq;
2283
2284 rcu_read_lock();
2285
2286 if (prev_node) {
Ying Xuef2f98002015-01-09 15:27:05 +08002287 node = tipc_node_find(net, prev_node);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002288 if (!node) {
2289 /* We never set seq or call nl_dump_check_consistent()
2290 * this means that setting prev_seq here will cause the
2291 * consistence check to fail in the netlink callback
2292 * handler. Resulting in the last NLMSG_DONE message
2293 * having the NLM_F_DUMP_INTR flag set.
2294 */
2295 cb->prev_seq = 1;
2296 goto out;
2297 }
2298
Ying Xuef2f98002015-01-09 15:27:05 +08002299 list_for_each_entry_continue_rcu(node, &tn->node_list,
2300 list) {
Richard Alpe7be57fc2014-11-20 10:29:12 +01002301 tipc_node_lock(node);
Ying Xue34747532015-01-09 15:27:10 +08002302 err = __tipc_nl_add_node_links(net, &msg, node,
2303 &prev_link);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002304 tipc_node_unlock(node);
2305 if (err)
2306 goto out;
2307
2308 prev_node = node->addr;
2309 }
2310 } else {
Ying Xue1da46562015-01-09 15:27:07 +08002311 err = tipc_nl_add_bc_link(net, &msg);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002312 if (err)
2313 goto out;
2314
Ying Xuef2f98002015-01-09 15:27:05 +08002315 list_for_each_entry_rcu(node, &tn->node_list, list) {
Richard Alpe7be57fc2014-11-20 10:29:12 +01002316 tipc_node_lock(node);
Ying Xue34747532015-01-09 15:27:10 +08002317 err = __tipc_nl_add_node_links(net, &msg, node,
2318 &prev_link);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002319 tipc_node_unlock(node);
2320 if (err)
2321 goto out;
2322
2323 prev_node = node->addr;
2324 }
2325 }
2326 done = 1;
2327out:
2328 rcu_read_unlock();
2329
2330 cb->args[0] = prev_node;
2331 cb->args[1] = prev_link;
2332 cb->args[2] = done;
2333
2334 return skb->len;
2335}
2336
2337int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info)
2338{
Ying Xuef2f98002015-01-09 15:27:05 +08002339 struct net *net = genl_info_net(info);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002340 struct sk_buff *ans_skb;
2341 struct tipc_nl_msg msg;
2342 struct tipc_link *link;
2343 struct tipc_node *node;
2344 char *name;
2345 int bearer_id;
2346 int err;
2347
2348 if (!info->attrs[TIPC_NLA_LINK_NAME])
2349 return -EINVAL;
2350
2351 name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]);
Ying Xuef2f98002015-01-09 15:27:05 +08002352 node = tipc_link_find_owner(net, name, &bearer_id);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002353 if (!node)
2354 return -EINVAL;
2355
2356 ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2357 if (!ans_skb)
2358 return -ENOMEM;
2359
2360 msg.skb = ans_skb;
2361 msg.portid = info->snd_portid;
2362 msg.seq = info->snd_seq;
2363
2364 tipc_node_lock(node);
2365 link = node->links[bearer_id];
2366 if (!link) {
2367 err = -EINVAL;
2368 goto err_out;
2369 }
2370
Ying Xue34747532015-01-09 15:27:10 +08002371 err = __tipc_nl_add_link(net, &msg, link);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002372 if (err)
2373 goto err_out;
2374
2375 tipc_node_unlock(node);
2376
2377 return genlmsg_reply(ans_skb, info);
2378
2379err_out:
2380 tipc_node_unlock(node);
2381 nlmsg_free(ans_skb);
2382
2383 return err;
2384}
Richard Alpeae363422014-11-20 10:29:14 +01002385
2386int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info)
2387{
2388 int err;
2389 char *link_name;
2390 unsigned int bearer_id;
2391 struct tipc_link *link;
2392 struct tipc_node *node;
2393 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
Richard Alpe18178772015-02-09 09:50:09 +01002394 struct net *net = sock_net(skb->sk);
Richard Alpeae363422014-11-20 10:29:14 +01002395
2396 if (!info->attrs[TIPC_NLA_LINK])
2397 return -EINVAL;
2398
2399 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
2400 info->attrs[TIPC_NLA_LINK],
2401 tipc_nl_link_policy);
2402 if (err)
2403 return err;
2404
2405 if (!attrs[TIPC_NLA_LINK_NAME])
2406 return -EINVAL;
2407
2408 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2409
2410 if (strcmp(link_name, tipc_bclink_name) == 0) {
Ying Xue1da46562015-01-09 15:27:07 +08002411 err = tipc_bclink_reset_stats(net);
Richard Alpeae363422014-11-20 10:29:14 +01002412 if (err)
2413 return err;
2414 return 0;
2415 }
2416
Ying Xuef2f98002015-01-09 15:27:05 +08002417 node = tipc_link_find_owner(net, link_name, &bearer_id);
Richard Alpeae363422014-11-20 10:29:14 +01002418 if (!node)
2419 return -EINVAL;
2420
2421 tipc_node_lock(node);
2422
2423 link = node->links[bearer_id];
2424 if (!link) {
2425 tipc_node_unlock(node);
2426 return -EINVAL;
2427 }
2428
2429 link_reset_statistics(link);
2430
2431 tipc_node_unlock(node);
2432
2433 return 0;
2434}