blob: 09e71241265ddf11ffec7ac0505c6377396f247b [file] [log] [blame]
Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/bearer.c: TIPC bearer code
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Per Liden593a5f22006-01-11 19:14:19 +01004 * Copyright (c) 1996-2006, Ericsson AB
Allan Stephens2d627b92011-01-07 13:00:11 -05005 * Copyright (c) 2004-2006, 2010-2011, 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"
38#include "config.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010039#include "bearer.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010040#include "discover.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010041
42#define MAX_ADDR_STR 32
43
Paul Gortmaker358a0d12011-12-29 20:19:42 -050044static struct tipc_media *media_list[MAX_MEDIA];
Allan Stephense3ec9c72010-12-31 18:59:34 +000045static u32 media_count;
Per Lidenb97bf3f2006-01-02 19:04:38 +010046
Allan Stephens2d627b92011-01-07 13:00:11 -050047struct tipc_bearer tipc_bearers[MAX_BEARERS];
Per Lidenb97bf3f2006-01-02 19:04:38 +010048
Allan Stephens3a777ff2011-04-21 13:58:26 -050049static void bearer_disable(struct tipc_bearer *b_ptr);
50
Per Lidenb97bf3f2006-01-02 19:04:38 +010051/**
52 * media_name_valid - validate media name
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090053 *
Per Lidenb97bf3f2006-01-02 19:04:38 +010054 * Returns 1 if media name is valid, otherwise 0.
55 */
Per Lidenb97bf3f2006-01-02 19:04:38 +010056static int media_name_valid(const char *name)
57{
58 u32 len;
59
60 len = strlen(name);
61 if ((len + 1) > TIPC_MAX_MEDIA_NAME)
62 return 0;
Eric Dumazeta02cec22010-09-22 20:43:57 +000063 return strspn(name, tipc_alphabet) == len;
Per Lidenb97bf3f2006-01-02 19:04:38 +010064}
65
66/**
Allan Stephens5c216e12011-10-18 11:34:29 -040067 * tipc_media_find - locates specified media object by name
Per Lidenb97bf3f2006-01-02 19:04:38 +010068 */
Paul Gortmaker358a0d12011-12-29 20:19:42 -050069struct tipc_media *tipc_media_find(const char *name)
Per Lidenb97bf3f2006-01-02 19:04:38 +010070{
Per Lidenb97bf3f2006-01-02 19:04:38 +010071 u32 i;
72
Allan Stephensa31abe82011-10-07 09:25:12 -040073 for (i = 0; i < media_count; i++) {
74 if (!strcmp(media_list[i]->name, name))
75 return media_list[i];
Per Lidenb97bf3f2006-01-02 19:04:38 +010076 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -080077 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +010078}
79
80/**
Allan Stephensc79be452011-10-06 16:40:55 -040081 * media_find_id - locates specified media object by type identifier
82 */
Paul Gortmaker358a0d12011-12-29 20:19:42 -050083static struct tipc_media *media_find_id(u8 type)
Allan Stephensc79be452011-10-06 16:40:55 -040084{
85 u32 i;
86
87 for (i = 0; i < media_count; i++) {
Allan Stephensa31abe82011-10-07 09:25:12 -040088 if (media_list[i]->type_id == type)
89 return media_list[i];
Allan Stephensc79be452011-10-06 16:40:55 -040090 }
91 return NULL;
92}
93
94/**
Per Lidenb97bf3f2006-01-02 19:04:38 +010095 * tipc_register_media - register a media type
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090096 *
Per Lidenb97bf3f2006-01-02 19:04:38 +010097 * Bearers for this media type must be activated separately at a later stage.
98 */
Paul Gortmaker358a0d12011-12-29 20:19:42 -050099int tipc_register_media(struct tipc_media *m_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100100{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100101 int res = -EINVAL;
102
Per Liden4323add2006-01-18 00:38:21 +0100103 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100104
Allan Stephens6c349212011-10-07 09:54:44 -0400105 if (!media_name_valid(m_ptr->name))
Neil Hormand0021b22010-03-03 08:31:23 +0000106 goto exit;
Allan Stephens3d749a62011-10-07 15:19:11 -0400107 if ((m_ptr->bcast_addr.media_id != m_ptr->type_id) ||
108 !m_ptr->bcast_addr.broadcast)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100109 goto exit;
Allan Stephens6c349212011-10-07 09:54:44 -0400110 if (m_ptr->priority > TIPC_MAX_LINK_PRI)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100111 goto exit;
Allan Stephens706767d2011-10-06 15:28:44 -0400112 if ((m_ptr->tolerance < TIPC_MIN_LINK_TOL) ||
Allan Stephens6c349212011-10-07 09:54:44 -0400113 (m_ptr->tolerance > TIPC_MAX_LINK_TOL))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100114 goto exit;
Allan Stephens6c349212011-10-07 09:54:44 -0400115 if (media_count >= MAX_MEDIA)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100116 goto exit;
Allan Stephens5c216e12011-10-18 11:34:29 -0400117 if (tipc_media_find(m_ptr->name) || media_find_id(m_ptr->type_id))
Allan Stephensc79be452011-10-06 16:40:55 -0400118 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100119
Allan Stephensa31abe82011-10-07 09:25:12 -0400120 media_list[media_count] = m_ptr;
Allan Stephensc79be452011-10-06 16:40:55 -0400121 media_count++;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100122 res = 0;
123exit:
Per Liden4323add2006-01-18 00:38:21 +0100124 write_unlock_bh(&tipc_net_lock);
Allan Stephens6c349212011-10-07 09:54:44 -0400125 if (res)
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400126 pr_warn("Media <%s> registration error\n", m_ptr->name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100127 return res;
128}
129
130/**
Per Liden4323add2006-01-18 00:38:21 +0100131 * tipc_media_addr_printf - record media address in print buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100132 */
Erik Hugnedc1aed32012-06-29 00:50:23 -0400133void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100134{
Allan Stephensc61b6662011-10-07 11:31:49 -0400135 char addr_str[MAX_ADDR_STR];
Paul Gortmaker358a0d12011-12-29 20:19:42 -0500136 struct tipc_media *m_ptr;
Erik Hugnedc1aed32012-06-29 00:50:23 -0400137 int ret;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100138
Allan Stephens3d749a62011-10-07 15:19:11 -0400139 m_ptr = media_find_id(a->media_id);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100140
Allan Stephensc61b6662011-10-07 11:31:49 -0400141 if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
Erik Hugnedc1aed32012-06-29 00:50:23 -0400142 ret = tipc_snprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
Allan Stephensc61b6662011-10-07 11:31:49 -0400143 else {
Allan Stephensc61b6662011-10-07 11:31:49 -0400144 u32 i;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100145
Erik Hugnedc1aed32012-06-29 00:50:23 -0400146 ret = tipc_snprintf(buf, len, "UNKNOWN(%u)", a->media_id);
Allan Stephens3d749a62011-10-07 15:19:11 -0400147 for (i = 0; i < sizeof(a->value); i++)
Erik Hugnedc1aed32012-06-29 00:50:23 -0400148 ret += tipc_snprintf(buf - ret, len + ret,
149 "-%02x", a->value[i]);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100150 }
151}
152
153/**
Per Liden4323add2006-01-18 00:38:21 +0100154 * tipc_media_get_names - record names of registered media in buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100155 */
Per Liden4323add2006-01-18 00:38:21 +0100156struct sk_buff *tipc_media_get_names(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100157{
158 struct sk_buff *buf;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100159 int i;
160
Per Liden4323add2006-01-18 00:38:21 +0100161 buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100162 if (!buf)
163 return NULL;
164
Per Liden4323add2006-01-18 00:38:21 +0100165 read_lock_bh(&tipc_net_lock);
Allan Stephensa31abe82011-10-07 09:25:12 -0400166 for (i = 0; i < media_count; i++) {
167 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME,
168 media_list[i]->name,
169 strlen(media_list[i]->name) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100170 }
Per Liden4323add2006-01-18 00:38:21 +0100171 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100172 return buf;
173}
174
175/**
176 * bearer_name_validate - validate & (optionally) deconstruct bearer name
Ben Hutchings2c530402012-07-10 10:55:09 +0000177 * @name: ptr to bearer name string
178 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900179 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100180 * Returns 1 if bearer name is valid, otherwise 0.
181 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900182static int bearer_name_validate(const char *name,
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500183 struct tipc_bearer_names *name_parts)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100184{
185 char name_copy[TIPC_MAX_BEARER_NAME];
186 char *media_name;
187 char *if_name;
188 u32 media_len;
189 u32 if_len;
190
191 /* copy bearer name & ensure length is OK */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100192 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
193 /* need above in case non-Posix strncpy() doesn't pad with nulls */
194 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
195 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
196 return 0;
197
198 /* ensure all component parts of bearer name are present */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100199 media_name = name_copy;
Allan Stephens2db99832010-12-31 18:59:33 +0000200 if_name = strchr(media_name, ':');
201 if (if_name == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100202 return 0;
203 *(if_name++) = 0;
204 media_len = if_name - media_name;
205 if_len = strlen(if_name) + 1;
206
207 /* validate component parts of bearer name */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900208 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
209 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) ||
Per Lidenb97bf3f2006-01-02 19:04:38 +0100210 (strspn(media_name, tipc_alphabet) != (media_len - 1)) ||
211 (strspn(if_name, tipc_alphabet) != (if_len - 1)))
212 return 0;
213
214 /* return bearer name components, if necessary */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100215 if (name_parts) {
216 strcpy(name_parts->media_name, media_name);
217 strcpy(name_parts->if_name, if_name);
218 }
219 return 1;
220}
221
222/**
Allan Stephens5c216e12011-10-18 11:34:29 -0400223 * tipc_bearer_find - locates bearer object with matching bearer name
Per Lidenb97bf3f2006-01-02 19:04:38 +0100224 */
Allan Stephens5c216e12011-10-18 11:34:29 -0400225struct tipc_bearer *tipc_bearer_find(const char *name)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100226{
Allan Stephens2d627b92011-01-07 13:00:11 -0500227 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100228 u32 i;
229
Per Liden4323add2006-01-18 00:38:21 +0100230 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
Allan Stephens2d627b92011-01-07 13:00:11 -0500231 if (b_ptr->active && (!strcmp(b_ptr->name, name)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100232 return b_ptr;
233 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800234 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100235}
236
237/**
Per Liden4323add2006-01-18 00:38:21 +0100238 * tipc_bearer_find_interface - locates bearer object with matching interface name
Per Lidenb97bf3f2006-01-02 19:04:38 +0100239 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500240struct tipc_bearer *tipc_bearer_find_interface(const char *if_name)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100241{
Allan Stephens2d627b92011-01-07 13:00:11 -0500242 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100243 char *b_if_name;
244 u32 i;
245
Per Liden4323add2006-01-18 00:38:21 +0100246 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100247 if (!b_ptr->active)
248 continue;
Allan Stephens2d627b92011-01-07 13:00:11 -0500249 b_if_name = strchr(b_ptr->name, ':') + 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100250 if (!strcmp(b_if_name, if_name))
251 return b_ptr;
252 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800253 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100254}
255
256/**
Per Liden4323add2006-01-18 00:38:21 +0100257 * tipc_bearer_get_names - record names of bearers in buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100258 */
Per Liden4323add2006-01-18 00:38:21 +0100259struct sk_buff *tipc_bearer_get_names(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100260{
261 struct sk_buff *buf;
Allan Stephens2d627b92011-01-07 13:00:11 -0500262 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100263 int i, j;
264
Per Liden4323add2006-01-18 00:38:21 +0100265 buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100266 if (!buf)
267 return NULL;
268
Per Liden4323add2006-01-18 00:38:21 +0100269 read_lock_bh(&tipc_net_lock);
Allan Stephensa31abe82011-10-07 09:25:12 -0400270 for (i = 0; i < media_count; i++) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100271 for (j = 0; j < MAX_BEARERS; j++) {
Per Liden4323add2006-01-18 00:38:21 +0100272 b_ptr = &tipc_bearers[j];
Allan Stephensa31abe82011-10-07 09:25:12 -0400273 if (b_ptr->active && (b_ptr->media == media_list[i])) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900274 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
Allan Stephens2d627b92011-01-07 13:00:11 -0500275 b_ptr->name,
276 strlen(b_ptr->name) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100277 }
278 }
279 }
Per Liden4323add2006-01-18 00:38:21 +0100280 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100281 return buf;
282}
283
Allan Stephens2d627b92011-01-07 13:00:11 -0500284void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100285{
Per Liden4323add2006-01-18 00:38:21 +0100286 tipc_nmap_add(&b_ptr->nodes, dest);
Per Liden4323add2006-01-18 00:38:21 +0100287 tipc_bcbearer_sort();
Allan Stephens12099662011-04-21 19:05:25 -0500288 tipc_disc_add_dest(b_ptr->link_req);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100289}
290
Allan Stephens2d627b92011-01-07 13:00:11 -0500291void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100292{
Per Liden4323add2006-01-18 00:38:21 +0100293 tipc_nmap_remove(&b_ptr->nodes, dest);
Per Liden4323add2006-01-18 00:38:21 +0100294 tipc_bcbearer_sort();
Allan Stephens12099662011-04-21 19:05:25 -0500295 tipc_disc_remove_dest(b_ptr->link_req);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100296}
297
298/*
299 * bearer_push(): Resolve bearer congestion. Force the waiting
300 * links to push out their unsent packets, one packet per link
301 * per iteration, until all packets are gone or congestion reoccurs.
Per Liden4323add2006-01-18 00:38:21 +0100302 * 'tipc_net_lock' is read_locked when this function is called
Per Lidenb97bf3f2006-01-02 19:04:38 +0100303 * bearer.lock must be taken before calling
304 * Returns binary true(1) ore false(0)
305 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500306static int bearer_push(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100307{
Allan Stephens0e35fd52008-07-14 22:44:01 -0700308 u32 res = 0;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500309 struct tipc_link *ln, *tln;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100310
Allan Stephens2d627b92011-01-07 13:00:11 -0500311 if (b_ptr->blocked)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100312 return 0;
313
314 while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) {
315 list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) {
Per Liden4323add2006-01-18 00:38:21 +0100316 res = tipc_link_push_packet(ln);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100317 if (res == PUSH_FAILED)
318 break;
319 if (res == PUSH_FINISHED)
320 list_move_tail(&ln->link_list, &b_ptr->links);
321 }
322 }
323 return list_empty(&b_ptr->cong_links);
324}
325
Allan Stephens2d627b92011-01-07 13:00:11 -0500326void tipc_bearer_lock_push(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100327{
Allan Stephens2d627b92011-01-07 13:00:11 -0500328 spin_lock_bh(&b_ptr->lock);
Allan Stephens23f0ff92011-04-07 11:25:26 -0400329 bearer_push(b_ptr);
Allan Stephens2d627b92011-01-07 13:00:11 -0500330 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100331}
332
333
334/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900335 * Interrupt enabling new requests after bearer congestion or blocking:
336 * See bearer_send().
Per Lidenb97bf3f2006-01-02 19:04:38 +0100337 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500338void tipc_continue(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100339{
Allan Stephens2d627b92011-01-07 13:00:11 -0500340 spin_lock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100341 if (!list_empty(&b_ptr->cong_links))
Per Liden4323add2006-01-18 00:38:21 +0100342 tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr);
Allan Stephens2d627b92011-01-07 13:00:11 -0500343 b_ptr->blocked = 0;
344 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100345}
346
347/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900348 * Schedule link for sending of messages after the bearer
349 * has been deblocked by 'continue()'. This method is called
350 * when somebody tries to send a message via this link while
Per Liden4323add2006-01-18 00:38:21 +0100351 * the bearer is congested. 'tipc_net_lock' is in read_lock here
Per Lidenb97bf3f2006-01-02 19:04:38 +0100352 * bearer.lock is busy
353 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500354static void tipc_bearer_schedule_unlocked(struct tipc_bearer *b_ptr,
355 struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100356{
357 list_move_tail(&l_ptr->link_list, &b_ptr->cong_links);
358}
359
360/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900361 * Schedule link for sending of messages after the bearer
362 * has been deblocked by 'continue()'. This method is called
363 * when somebody tries to send a message via this link while
Per Liden4323add2006-01-18 00:38:21 +0100364 * the bearer is congested. 'tipc_net_lock' is in read_lock here,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100365 * bearer.lock is free
366 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500367void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100368{
Allan Stephens2d627b92011-01-07 13:00:11 -0500369 spin_lock_bh(&b_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100370 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
Allan Stephens2d627b92011-01-07 13:00:11 -0500371 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100372}
373
374
375/*
Per Liden4323add2006-01-18 00:38:21 +0100376 * tipc_bearer_resolve_congestion(): Check if there is bearer congestion,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100377 * and if there is, try to resolve it before returning.
Per Liden4323add2006-01-18 00:38:21 +0100378 * 'tipc_net_lock' is read_locked when this function is called
Per Lidenb97bf3f2006-01-02 19:04:38 +0100379 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500380int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr,
381 struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100382{
383 int res = 1;
384
385 if (list_empty(&b_ptr->cong_links))
386 return 1;
Allan Stephens2d627b92011-01-07 13:00:11 -0500387 spin_lock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100388 if (!bearer_push(b_ptr)) {
Per Liden4323add2006-01-18 00:38:21 +0100389 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100390 res = 0;
391 }
Allan Stephens2d627b92011-01-07 13:00:11 -0500392 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100393 return res;
394}
395
Allan Stephensb274f4a2010-05-11 14:30:16 +0000396/**
397 * tipc_bearer_congested - determines if bearer is currently congested
398 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500399int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr)
Allan Stephensb274f4a2010-05-11 14:30:16 +0000400{
Allan Stephens2d627b92011-01-07 13:00:11 -0500401 if (unlikely(b_ptr->blocked))
Allan Stephensb274f4a2010-05-11 14:30:16 +0000402 return 1;
403 if (likely(list_empty(&b_ptr->cong_links)))
404 return 0;
405 return !tipc_bearer_resolve_congestion(b_ptr, l_ptr);
406}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100407
408/**
409 * tipc_enable_bearer - enable bearer with the given name
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900410 */
Allan Stephens50d3e632011-02-28 14:56:15 -0500411int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100412{
Allan Stephens2d627b92011-01-07 13:00:11 -0500413 struct tipc_bearer *b_ptr;
Paul Gortmaker358a0d12011-12-29 20:19:42 -0500414 struct tipc_media *m_ptr;
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500415 struct tipc_bearer_names b_names;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100416 char addr_string[16];
417 u32 bearer_id;
418 u32 with_this_prio;
419 u32 i;
420 int res = -EINVAL;
421
Allan Stephensb58343f2011-11-08 13:48:28 -0500422 if (!tipc_own_addr) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400423 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
424 name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100425 return -ENOPROTOOPT;
Allan Stephensa10bd922006-06-25 23:52:17 -0700426 }
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500427 if (!bearer_name_validate(name, &b_names)) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400428 pr_warn("Bearer <%s> rejected, illegal name\n", name);
Per Liden16cb4b32006-01-13 22:22:22 +0100429 return -EINVAL;
Allan Stephensa10bd922006-06-25 23:52:17 -0700430 }
Allan Stephens66e019a2011-04-20 16:24:07 -0500431 if (tipc_addr_domain_valid(disc_domain) &&
432 (disc_domain != tipc_own_addr)) {
433 if (tipc_in_scope(disc_domain, tipc_own_addr)) {
434 disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
435 res = 0; /* accept any node in own cluster */
Allan Stephens336ebf52012-04-17 18:02:01 -0400436 } else if (in_own_cluster_exact(disc_domain))
Allan Stephens66e019a2011-04-20 16:24:07 -0500437 res = 0; /* accept specified node in own cluster */
438 }
439 if (res) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400440 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
441 name);
Allan Stephensa10bd922006-06-25 23:52:17 -0700442 return -EINVAL;
443 }
Allan Stephens9efde4a2011-11-03 13:15:10 -0400444 if ((priority > TIPC_MAX_LINK_PRI) &&
Allan Stephensa10bd922006-06-25 23:52:17 -0700445 (priority != TIPC_MEDIA_LINK_PRI)) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400446 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100447 return -EINVAL;
Allan Stephensa10bd922006-06-25 23:52:17 -0700448 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100449
Per Liden4323add2006-01-18 00:38:21 +0100450 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100451
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500452 m_ptr = tipc_media_find(b_names.media_name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100453 if (!m_ptr) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400454 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
455 name, b_names.media_name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500456 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100457 }
Per Liden16cb4b32006-01-13 22:22:22 +0100458
459 if (priority == TIPC_MEDIA_LINK_PRI)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100460 priority = m_ptr->priority;
461
462restart:
463 bearer_id = MAX_BEARERS;
464 with_this_prio = 1;
465 for (i = MAX_BEARERS; i-- != 0; ) {
Per Liden4323add2006-01-18 00:38:21 +0100466 if (!tipc_bearers[i].active) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100467 bearer_id = i;
468 continue;
469 }
Allan Stephens2d627b92011-01-07 13:00:11 -0500470 if (!strcmp(name, tipc_bearers[i].name)) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400471 pr_warn("Bearer <%s> rejected, already enabled\n",
472 name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500473 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100474 }
Per Liden4323add2006-01-18 00:38:21 +0100475 if ((tipc_bearers[i].priority == priority) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100476 (++with_this_prio > 2)) {
477 if (priority-- == 0) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400478 pr_warn("Bearer <%s> rejected, duplicate priority\n",
479 name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500480 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100481 }
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400482 pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
483 name, priority + 1, priority);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100484 goto restart;
485 }
486 }
487 if (bearer_id >= MAX_BEARERS) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400488 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
489 name, MAX_BEARERS);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500490 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100491 }
492
Per Liden4323add2006-01-18 00:38:21 +0100493 b_ptr = &tipc_bearers[bearer_id];
Allan Stephens2d627b92011-01-07 13:00:11 -0500494 strcpy(b_ptr->name, name);
495 res = m_ptr->enable_bearer(b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100496 if (res) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400497 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
498 name, -res);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500499 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100500 }
501
502 b_ptr->identity = bearer_id;
503 b_ptr->media = m_ptr;
Allan Stephens5c216e12011-10-18 11:34:29 -0400504 b_ptr->tolerance = m_ptr->tolerance;
505 b_ptr->window = m_ptr->window;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100506 b_ptr->net_plane = bearer_id + 'A';
507 b_ptr->active = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100508 b_ptr->priority = priority;
509 INIT_LIST_HEAD(&b_ptr->cong_links);
510 INIT_LIST_HEAD(&b_ptr->links);
Allan Stephens2d627b92011-01-07 13:00:11 -0500511 spin_lock_init(&b_ptr->lock);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500512
513 res = tipc_disc_create(b_ptr, &m_ptr->bcast_addr, disc_domain);
514 if (res) {
515 bearer_disable(b_ptr);
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400516 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
517 name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500518 goto exit;
519 }
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400520 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
521 name,
522 tipc_addr_string_fill(addr_string, disc_domain), priority);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500523exit:
Per Liden4323add2006-01-18 00:38:21 +0100524 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100525 return res;
526}
527
528/**
Ben Hutchings2c530402012-07-10 10:55:09 +0000529 * tipc_block_bearer - Block the bearer with the given name, and reset all its links
Per Lidenb97bf3f2006-01-02 19:04:38 +0100530 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100531int tipc_block_bearer(const char *name)
532{
Allan Stephens2d627b92011-01-07 13:00:11 -0500533 struct tipc_bearer *b_ptr = NULL;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500534 struct tipc_link *l_ptr;
535 struct tipc_link *temp_l_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100536
Per Liden4323add2006-01-18 00:38:21 +0100537 read_lock_bh(&tipc_net_lock);
Allan Stephens5c216e12011-10-18 11:34:29 -0400538 b_ptr = tipc_bearer_find(name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100539 if (!b_ptr) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400540 pr_warn("Attempt to block unknown bearer <%s>\n", name);
Per Liden4323add2006-01-18 00:38:21 +0100541 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100542 return -EINVAL;
543 }
544
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400545 pr_info("Blocking bearer <%s>\n", name);
Allan Stephens2d627b92011-01-07 13:00:11 -0500546 spin_lock_bh(&b_ptr->lock);
547 b_ptr->blocked = 1;
Allan Stephens4b3743e2011-05-26 13:59:17 -0400548 list_splice_init(&b_ptr->cong_links, &b_ptr->links);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100549 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
David S. Miller6c000552008-09-02 23:38:32 -0700550 struct tipc_node *n_ptr = l_ptr->owner;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100551
552 spin_lock_bh(&n_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100553 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100554 spin_unlock_bh(&n_ptr->lock);
555 }
Allan Stephens2d627b92011-01-07 13:00:11 -0500556 spin_unlock_bh(&b_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100557 read_unlock_bh(&tipc_net_lock);
Allan Stephens0e35fd52008-07-14 22:44:01 -0700558 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100559}
560
561/**
Paul Gortmaker617d3c72012-04-30 15:29:02 -0400562 * bearer_disable
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900563 *
Per Liden4323add2006-01-18 00:38:21 +0100564 * Note: This routine assumes caller holds tipc_net_lock.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100565 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500566static void bearer_disable(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100567{
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500568 struct tipc_link *l_ptr;
569 struct tipc_link *temp_l_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100570
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400571 pr_info("Disabling bearer <%s>\n", b_ptr->name);
Allan Stephens2d627b92011-01-07 13:00:11 -0500572 spin_lock_bh(&b_ptr->lock);
Allan Stephens2d627b92011-01-07 13:00:11 -0500573 b_ptr->blocked = 1;
574 b_ptr->media->disable_bearer(b_ptr);
Allan Stephens4b3743e2011-05-26 13:59:17 -0400575 list_splice_init(&b_ptr->cong_links, &b_ptr->links);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100576 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
Per Liden4323add2006-01-18 00:38:21 +0100577 tipc_link_delete(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100578 }
Allan Stephens3a777ff2011-04-21 13:58:26 -0500579 if (b_ptr->link_req)
580 tipc_disc_delete(b_ptr->link_req);
Allan Stephens2d627b92011-01-07 13:00:11 -0500581 spin_unlock_bh(&b_ptr->lock);
582 memset(b_ptr, 0, sizeof(struct tipc_bearer));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100583}
584
585int tipc_disable_bearer(const char *name)
586{
Allan Stephens2d627b92011-01-07 13:00:11 -0500587 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100588 int res;
589
Per Liden4323add2006-01-18 00:38:21 +0100590 write_lock_bh(&tipc_net_lock);
Allan Stephens5c216e12011-10-18 11:34:29 -0400591 b_ptr = tipc_bearer_find(name);
Allan Stephensccc901e2010-10-14 13:58:26 +0000592 if (b_ptr == NULL) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400593 pr_warn("Attempt to disable unknown bearer <%s>\n", name);
Allan Stephensccc901e2010-10-14 13:58:26 +0000594 res = -EINVAL;
Allan Stephens28cc9372010-11-30 12:00:56 +0000595 } else {
596 bearer_disable(b_ptr);
597 res = 0;
598 }
Per Liden4323add2006-01-18 00:38:21 +0100599 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100600 return res;
601}
602
603
604
Per Liden4323add2006-01-18 00:38:21 +0100605void tipc_bearer_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100606{
607 u32 i;
608
Per Lidenb97bf3f2006-01-02 19:04:38 +0100609 for (i = 0; i < MAX_BEARERS; i++) {
Per Liden4323add2006-01-18 00:38:21 +0100610 if (tipc_bearers[i].active)
Allan Stephensccc901e2010-10-14 13:58:26 +0000611 bearer_disable(&tipc_bearers[i]);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100612 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100613 media_count = 0;
614}