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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
Neil Hormand0021b22010-03-03 08:31:23 +000044static struct 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 */
56
57static int media_name_valid(const char *name)
58{
59 u32 len;
60
61 len = strlen(name);
62 if ((len + 1) > TIPC_MAX_MEDIA_NAME)
63 return 0;
Eric Dumazeta02cec22010-09-22 20:43:57 +000064 return strspn(name, tipc_alphabet) == len;
Per Lidenb97bf3f2006-01-02 19:04:38 +010065}
66
67/**
68 * media_find - locates specified media object by name
69 */
70
71static struct media *media_find(const char *name)
72{
73 struct media *m_ptr;
74 u32 i;
75
76 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
77 if (!strcmp(m_ptr->name, name))
78 return m_ptr;
79 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -080080 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +010081}
82
83/**
84 * tipc_register_media - register a media type
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090085 *
Per Lidenb97bf3f2006-01-02 19:04:38 +010086 * Bearers for this media type must be activated separately at a later stage.
87 */
88
89int tipc_register_media(u32 media_type,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090090 char *name,
91 int (*enable)(struct tipc_bearer *),
92 void (*disable)(struct tipc_bearer *),
93 int (*send_msg)(struct sk_buff *,
Per Lidenb97bf3f2006-01-02 19:04:38 +010094 struct tipc_bearer *,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090095 struct tipc_media_addr *),
Per Lidenb97bf3f2006-01-02 19:04:38 +010096 char *(*addr2str)(struct tipc_media_addr *a,
97 char *str_buf, int str_size),
98 struct tipc_media_addr *bcast_addr,
99 const u32 bearer_priority,
100 const u32 link_tolerance, /* [ms] */
101 const u32 send_window_limit)
102{
103 struct media *m_ptr;
104 u32 media_id;
105 u32 i;
106 int res = -EINVAL;
107
Per Liden4323add2006-01-18 00:38:21 +0100108 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100109
Neil Hormand0021b22010-03-03 08:31:23 +0000110 if (tipc_mode != TIPC_NET_MODE) {
111 warn("Media <%s> rejected, not in networked mode yet\n", name);
112 goto exit;
113 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100114 if (!media_name_valid(name)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700115 warn("Media <%s> rejected, illegal name\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100116 goto exit;
117 }
118 if (!bcast_addr) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700119 warn("Media <%s> rejected, no broadcast address\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100120 goto exit;
121 }
roel kluinb3df9a52009-08-27 02:03:15 +0000122 if ((bearer_priority < TIPC_MIN_LINK_PRI) ||
Per Liden16cb4b32006-01-13 22:22:22 +0100123 (bearer_priority > TIPC_MAX_LINK_PRI)) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900124 warn("Media <%s> rejected, illegal priority (%u)\n", name,
Allan Stephensa10bd922006-06-25 23:52:17 -0700125 bearer_priority);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100126 goto exit;
127 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900128 if ((link_tolerance < TIPC_MIN_LINK_TOL) ||
Per Lidenb97bf3f2006-01-02 19:04:38 +0100129 (link_tolerance > TIPC_MAX_LINK_TOL)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700130 warn("Media <%s> rejected, illegal tolerance (%u)\n", name,
131 link_tolerance);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100132 goto exit;
133 }
134
135 media_id = media_count++;
136 if (media_id >= MAX_MEDIA) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700137 warn("Media <%s> rejected, media limit reached (%u)\n", name,
138 MAX_MEDIA);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100139 media_count--;
140 goto exit;
141 }
142 for (i = 0; i < media_id; i++) {
143 if (media_list[i].type_id == media_type) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700144 warn("Media <%s> rejected, duplicate type (%u)\n", name,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100145 media_type);
146 media_count--;
147 goto exit;
148 }
149 if (!strcmp(name, media_list[i].name)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700150 warn("Media <%s> rejected, duplicate name\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100151 media_count--;
152 goto exit;
153 }
154 }
155
156 m_ptr = &media_list[media_id];
157 m_ptr->type_id = media_type;
158 m_ptr->send_msg = send_msg;
159 m_ptr->enable_bearer = enable;
160 m_ptr->disable_bearer = disable;
161 m_ptr->addr2str = addr2str;
162 memcpy(&m_ptr->bcast_addr, bcast_addr, sizeof(*bcast_addr));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100163 strcpy(m_ptr->name, name);
164 m_ptr->priority = bearer_priority;
165 m_ptr->tolerance = link_tolerance;
166 m_ptr->window = send_window_limit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100167 res = 0;
168exit:
Per Liden4323add2006-01-18 00:38:21 +0100169 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100170 return res;
171}
172
173/**
Per Liden4323add2006-01-18 00:38:21 +0100174 * tipc_media_addr_printf - record media address in print buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100175 */
176
Per Liden4323add2006-01-18 00:38:21 +0100177void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100178{
179 struct media *m_ptr;
180 u32 media_type;
181 u32 i;
182
183 media_type = ntohl(a->type);
184 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
185 if (m_ptr->type_id == media_type)
186 break;
187 }
188
189 if ((i < media_count) && (m_ptr->addr2str != NULL)) {
190 char addr_str[MAX_ADDR_STR];
191
Allan Stephense91ed0b2006-10-16 21:44:59 -0700192 tipc_printf(pb, "%s(%s)", m_ptr->name,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100193 m_ptr->addr2str(a, addr_str, sizeof(addr_str)));
194 } else {
195 unchar *addr = (unchar *)&a->dev_addr;
196
Allan Stephense91ed0b2006-10-16 21:44:59 -0700197 tipc_printf(pb, "UNKNOWN(%u)", media_type);
Allan Stephensa0168922010-12-31 18:59:35 +0000198 for (i = 0; i < (sizeof(*a) - sizeof(a->type)); i++)
Allan Stephense91ed0b2006-10-16 21:44:59 -0700199 tipc_printf(pb, "-%02x", addr[i]);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100200 }
201}
202
203/**
Per Liden4323add2006-01-18 00:38:21 +0100204 * tipc_media_get_names - record names of registered media in buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100205 */
206
Per Liden4323add2006-01-18 00:38:21 +0100207struct sk_buff *tipc_media_get_names(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100208{
209 struct sk_buff *buf;
210 struct media *m_ptr;
211 int i;
212
Per Liden4323add2006-01-18 00:38:21 +0100213 buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100214 if (!buf)
215 return NULL;
216
Per Liden4323add2006-01-18 00:38:21 +0100217 read_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100218 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900219 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, m_ptr->name,
Per Liden4323add2006-01-18 00:38:21 +0100220 strlen(m_ptr->name) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100221 }
Per Liden4323add2006-01-18 00:38:21 +0100222 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100223 return buf;
224}
225
226/**
227 * bearer_name_validate - validate & (optionally) deconstruct bearer name
228 * @name - ptr to bearer name string
229 * @name_parts - ptr to area for bearer name components (or NULL if not needed)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900230 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100231 * Returns 1 if bearer name is valid, otherwise 0.
232 */
233
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900234static int bearer_name_validate(const char *name,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100235 struct bearer_name *name_parts)
236{
237 char name_copy[TIPC_MAX_BEARER_NAME];
238 char *media_name;
239 char *if_name;
240 u32 media_len;
241 u32 if_len;
242
243 /* copy bearer name & ensure length is OK */
244
245 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
246 /* need above in case non-Posix strncpy() doesn't pad with nulls */
247 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
248 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
249 return 0;
250
251 /* ensure all component parts of bearer name are present */
252
253 media_name = name_copy;
Allan Stephens2db99832010-12-31 18:59:33 +0000254 if_name = strchr(media_name, ':');
255 if (if_name == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100256 return 0;
257 *(if_name++) = 0;
258 media_len = if_name - media_name;
259 if_len = strlen(if_name) + 1;
260
261 /* validate component parts of bearer name */
262
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900263 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
264 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) ||
Per Lidenb97bf3f2006-01-02 19:04:38 +0100265 (strspn(media_name, tipc_alphabet) != (media_len - 1)) ||
266 (strspn(if_name, tipc_alphabet) != (if_len - 1)))
267 return 0;
268
269 /* return bearer name components, if necessary */
270
271 if (name_parts) {
272 strcpy(name_parts->media_name, media_name);
273 strcpy(name_parts->if_name, if_name);
274 }
275 return 1;
276}
277
278/**
279 * bearer_find - locates bearer object with matching bearer name
280 */
281
Allan Stephens2d627b92011-01-07 13:00:11 -0500282static struct tipc_bearer *bearer_find(const char *name)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100283{
Allan Stephens2d627b92011-01-07 13:00:11 -0500284 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100285 u32 i;
286
Per Liden4323add2006-01-18 00:38:21 +0100287 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
Allan Stephens2d627b92011-01-07 13:00:11 -0500288 if (b_ptr->active && (!strcmp(b_ptr->name, name)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100289 return b_ptr;
290 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800291 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100292}
293
294/**
Per Liden4323add2006-01-18 00:38:21 +0100295 * tipc_bearer_find_interface - locates bearer object with matching interface name
Per Lidenb97bf3f2006-01-02 19:04:38 +0100296 */
297
Allan Stephens2d627b92011-01-07 13:00:11 -0500298struct tipc_bearer *tipc_bearer_find_interface(const char *if_name)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100299{
Allan Stephens2d627b92011-01-07 13:00:11 -0500300 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100301 char *b_if_name;
302 u32 i;
303
Per Liden4323add2006-01-18 00:38:21 +0100304 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100305 if (!b_ptr->active)
306 continue;
Allan Stephens2d627b92011-01-07 13:00:11 -0500307 b_if_name = strchr(b_ptr->name, ':') + 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100308 if (!strcmp(b_if_name, if_name))
309 return b_ptr;
310 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800311 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100312}
313
314/**
Per Liden4323add2006-01-18 00:38:21 +0100315 * tipc_bearer_get_names - record names of bearers in buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100316 */
317
Per Liden4323add2006-01-18 00:38:21 +0100318struct sk_buff *tipc_bearer_get_names(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100319{
320 struct sk_buff *buf;
321 struct media *m_ptr;
Allan Stephens2d627b92011-01-07 13:00:11 -0500322 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100323 int i, j;
324
Per Liden4323add2006-01-18 00:38:21 +0100325 buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100326 if (!buf)
327 return NULL;
328
Per Liden4323add2006-01-18 00:38:21 +0100329 read_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100330 for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
331 for (j = 0; j < MAX_BEARERS; j++) {
Per Liden4323add2006-01-18 00:38:21 +0100332 b_ptr = &tipc_bearers[j];
Per Lidenb97bf3f2006-01-02 19:04:38 +0100333 if (b_ptr->active && (b_ptr->media == m_ptr)) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900334 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
Allan Stephens2d627b92011-01-07 13:00:11 -0500335 b_ptr->name,
336 strlen(b_ptr->name) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100337 }
338 }
339 }
Per Liden4323add2006-01-18 00:38:21 +0100340 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100341 return buf;
342}
343
Allan Stephens2d627b92011-01-07 13:00:11 -0500344void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100345{
Per Liden4323add2006-01-18 00:38:21 +0100346 tipc_nmap_add(&b_ptr->nodes, dest);
Per Liden4323add2006-01-18 00:38:21 +0100347 tipc_bcbearer_sort();
Allan Stephens12099662011-04-21 19:05:25 -0500348 tipc_disc_add_dest(b_ptr->link_req);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100349}
350
Allan Stephens2d627b92011-01-07 13:00:11 -0500351void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100352{
Per Liden4323add2006-01-18 00:38:21 +0100353 tipc_nmap_remove(&b_ptr->nodes, dest);
Per Liden4323add2006-01-18 00:38:21 +0100354 tipc_bcbearer_sort();
Allan Stephens12099662011-04-21 19:05:25 -0500355 tipc_disc_remove_dest(b_ptr->link_req);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100356}
357
358/*
359 * bearer_push(): Resolve bearer congestion. Force the waiting
360 * links to push out their unsent packets, one packet per link
361 * per iteration, until all packets are gone or congestion reoccurs.
Per Liden4323add2006-01-18 00:38:21 +0100362 * 'tipc_net_lock' is read_locked when this function is called
Per Lidenb97bf3f2006-01-02 19:04:38 +0100363 * bearer.lock must be taken before calling
364 * Returns binary true(1) ore false(0)
365 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500366static int bearer_push(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100367{
Allan Stephens0e35fd52008-07-14 22:44:01 -0700368 u32 res = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100369 struct link *ln, *tln;
370
Allan Stephens2d627b92011-01-07 13:00:11 -0500371 if (b_ptr->blocked)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100372 return 0;
373
374 while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) {
375 list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) {
Per Liden4323add2006-01-18 00:38:21 +0100376 res = tipc_link_push_packet(ln);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100377 if (res == PUSH_FAILED)
378 break;
379 if (res == PUSH_FINISHED)
380 list_move_tail(&ln->link_list, &b_ptr->links);
381 }
382 }
383 return list_empty(&b_ptr->cong_links);
384}
385
Allan Stephens2d627b92011-01-07 13:00:11 -0500386void tipc_bearer_lock_push(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100387{
388 int res;
389
Allan Stephens2d627b92011-01-07 13:00:11 -0500390 spin_lock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100391 res = bearer_push(b_ptr);
Allan Stephens2d627b92011-01-07 13:00:11 -0500392 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100393 if (res)
Per Liden4323add2006-01-18 00:38:21 +0100394 tipc_bcbearer_push();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100395}
396
397
398/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900399 * Interrupt enabling new requests after bearer congestion or blocking:
400 * See bearer_send().
Per Lidenb97bf3f2006-01-02 19:04:38 +0100401 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500402void tipc_continue(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100403{
Allan Stephens2d627b92011-01-07 13:00:11 -0500404 spin_lock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100405 if (!list_empty(&b_ptr->cong_links))
Per Liden4323add2006-01-18 00:38:21 +0100406 tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr);
Allan Stephens2d627b92011-01-07 13:00:11 -0500407 b_ptr->blocked = 0;
408 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100409}
410
411/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900412 * Schedule link for sending of messages after the bearer
413 * has been deblocked by 'continue()'. This method is called
414 * when somebody tries to send a message via this link while
Per Liden4323add2006-01-18 00:38:21 +0100415 * the bearer is congested. 'tipc_net_lock' is in read_lock here
Per Lidenb97bf3f2006-01-02 19:04:38 +0100416 * bearer.lock is busy
417 */
418
Allan Stephens2d627b92011-01-07 13:00:11 -0500419static void tipc_bearer_schedule_unlocked(struct tipc_bearer *b_ptr, struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100420{
421 list_move_tail(&l_ptr->link_list, &b_ptr->cong_links);
422}
423
424/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900425 * Schedule link for sending of messages after the bearer
426 * has been deblocked by 'continue()'. This method is called
427 * when somebody tries to send a message via this link while
Per Liden4323add2006-01-18 00:38:21 +0100428 * the bearer is congested. 'tipc_net_lock' is in read_lock here,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100429 * bearer.lock is free
430 */
431
Allan Stephens2d627b92011-01-07 13:00:11 -0500432void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100433{
Allan Stephens2d627b92011-01-07 13:00:11 -0500434 spin_lock_bh(&b_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100435 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
Allan Stephens2d627b92011-01-07 13:00:11 -0500436 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100437}
438
439
440/*
Per Liden4323add2006-01-18 00:38:21 +0100441 * tipc_bearer_resolve_congestion(): Check if there is bearer congestion,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100442 * and if there is, try to resolve it before returning.
Per Liden4323add2006-01-18 00:38:21 +0100443 * 'tipc_net_lock' is read_locked when this function is called
Per Lidenb97bf3f2006-01-02 19:04:38 +0100444 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500445int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr, struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100446{
447 int res = 1;
448
449 if (list_empty(&b_ptr->cong_links))
450 return 1;
Allan Stephens2d627b92011-01-07 13:00:11 -0500451 spin_lock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100452 if (!bearer_push(b_ptr)) {
Per Liden4323add2006-01-18 00:38:21 +0100453 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100454 res = 0;
455 }
Allan Stephens2d627b92011-01-07 13:00:11 -0500456 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100457 return res;
458}
459
Allan Stephensb274f4a2010-05-11 14:30:16 +0000460/**
461 * tipc_bearer_congested - determines if bearer is currently congested
462 */
463
Allan Stephens2d627b92011-01-07 13:00:11 -0500464int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct link *l_ptr)
Allan Stephensb274f4a2010-05-11 14:30:16 +0000465{
Allan Stephens2d627b92011-01-07 13:00:11 -0500466 if (unlikely(b_ptr->blocked))
Allan Stephensb274f4a2010-05-11 14:30:16 +0000467 return 1;
468 if (likely(list_empty(&b_ptr->cong_links)))
469 return 0;
470 return !tipc_bearer_resolve_congestion(b_ptr, l_ptr);
471}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100472
473/**
474 * tipc_enable_bearer - enable bearer with the given name
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900475 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100476
Allan Stephens50d3e632011-02-28 14:56:15 -0500477int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100478{
Allan Stephens2d627b92011-01-07 13:00:11 -0500479 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100480 struct media *m_ptr;
481 struct bearer_name b_name;
482 char addr_string[16];
483 u32 bearer_id;
484 u32 with_this_prio;
485 u32 i;
486 int res = -EINVAL;
487
Allan Stephensa10bd922006-06-25 23:52:17 -0700488 if (tipc_mode != TIPC_NET_MODE) {
489 warn("Bearer <%s> rejected, not supported in standalone mode\n",
490 name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100491 return -ENOPROTOOPT;
Allan Stephensa10bd922006-06-25 23:52:17 -0700492 }
493 if (!bearer_name_validate(name, &b_name)) {
494 warn("Bearer <%s> rejected, illegal name\n", name);
Per Liden16cb4b32006-01-13 22:22:22 +0100495 return -EINVAL;
Allan Stephensa10bd922006-06-25 23:52:17 -0700496 }
Allan Stephens66e019a2011-04-20 16:24:07 -0500497 if (tipc_addr_domain_valid(disc_domain) &&
498 (disc_domain != tipc_own_addr)) {
499 if (tipc_in_scope(disc_domain, tipc_own_addr)) {
500 disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
501 res = 0; /* accept any node in own cluster */
502 } else if (in_own_cluster(disc_domain))
503 res = 0; /* accept specified node in own cluster */
504 }
505 if (res) {
Allan Stephens50d3e632011-02-28 14:56:15 -0500506 warn("Bearer <%s> rejected, illegal discovery domain\n", name);
Allan Stephensa10bd922006-06-25 23:52:17 -0700507 return -EINVAL;
508 }
Per Liden16cb4b32006-01-13 22:22:22 +0100509 if ((priority < TIPC_MIN_LINK_PRI ||
510 priority > TIPC_MAX_LINK_PRI) &&
Allan Stephensa10bd922006-06-25 23:52:17 -0700511 (priority != TIPC_MEDIA_LINK_PRI)) {
512 warn("Bearer <%s> rejected, illegal priority\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100513 return -EINVAL;
Allan Stephensa10bd922006-06-25 23:52:17 -0700514 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100515
Per Liden4323add2006-01-18 00:38:21 +0100516 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100517
518 m_ptr = media_find(b_name.media_name);
519 if (!m_ptr) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700520 warn("Bearer <%s> rejected, media <%s> not registered\n", name,
521 b_name.media_name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500522 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100523 }
Per Liden16cb4b32006-01-13 22:22:22 +0100524
525 if (priority == TIPC_MEDIA_LINK_PRI)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100526 priority = m_ptr->priority;
527
528restart:
529 bearer_id = MAX_BEARERS;
530 with_this_prio = 1;
531 for (i = MAX_BEARERS; i-- != 0; ) {
Per Liden4323add2006-01-18 00:38:21 +0100532 if (!tipc_bearers[i].active) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100533 bearer_id = i;
534 continue;
535 }
Allan Stephens2d627b92011-01-07 13:00:11 -0500536 if (!strcmp(name, tipc_bearers[i].name)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700537 warn("Bearer <%s> rejected, already enabled\n", name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500538 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100539 }
Per Liden4323add2006-01-18 00:38:21 +0100540 if ((tipc_bearers[i].priority == priority) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100541 (++with_this_prio > 2)) {
542 if (priority-- == 0) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700543 warn("Bearer <%s> rejected, duplicate priority\n",
544 name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500545 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100546 }
Allan Stephensa10bd922006-06-25 23:52:17 -0700547 warn("Bearer <%s> priority adjustment required %u->%u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +0100548 name, priority + 1, priority);
549 goto restart;
550 }
551 }
552 if (bearer_id >= MAX_BEARERS) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900553 warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
Allan Stephensa10bd922006-06-25 23:52:17 -0700554 name, MAX_BEARERS);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500555 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100556 }
557
Per Liden4323add2006-01-18 00:38:21 +0100558 b_ptr = &tipc_bearers[bearer_id];
Allan Stephens2d627b92011-01-07 13:00:11 -0500559 strcpy(b_ptr->name, name);
560 res = m_ptr->enable_bearer(b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100561 if (res) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700562 warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500563 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100564 }
565
566 b_ptr->identity = bearer_id;
567 b_ptr->media = m_ptr;
568 b_ptr->net_plane = bearer_id + 'A';
569 b_ptr->active = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100570 b_ptr->priority = priority;
571 INIT_LIST_HEAD(&b_ptr->cong_links);
572 INIT_LIST_HEAD(&b_ptr->links);
Allan Stephens2d627b92011-01-07 13:00:11 -0500573 spin_lock_init(&b_ptr->lock);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500574
575 res = tipc_disc_create(b_ptr, &m_ptr->bcast_addr, disc_domain);
576 if (res) {
577 bearer_disable(b_ptr);
578 warn("Bearer <%s> rejected, discovery object creation failed\n",
579 name);
580 goto exit;
581 }
Per Liden16cb4b32006-01-13 22:22:22 +0100582 info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
Allan Stephens50d3e632011-02-28 14:56:15 -0500583 name, tipc_addr_string_fill(addr_string, disc_domain), priority);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500584exit:
Per Liden4323add2006-01-18 00:38:21 +0100585 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100586 return res;
587}
588
589/**
590 * tipc_block_bearer(): Block the bearer with the given name,
591 * and reset all its links
592 */
593
594int tipc_block_bearer(const char *name)
595{
Allan Stephens2d627b92011-01-07 13:00:11 -0500596 struct tipc_bearer *b_ptr = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100597 struct link *l_ptr;
598 struct link *temp_l_ptr;
599
Per Liden4323add2006-01-18 00:38:21 +0100600 read_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100601 b_ptr = bearer_find(name);
602 if (!b_ptr) {
603 warn("Attempt to block unknown bearer <%s>\n", name);
Per Liden4323add2006-01-18 00:38:21 +0100604 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100605 return -EINVAL;
606 }
607
Allan Stephensa10bd922006-06-25 23:52:17 -0700608 info("Blocking bearer <%s>\n", name);
Allan Stephens2d627b92011-01-07 13:00:11 -0500609 spin_lock_bh(&b_ptr->lock);
610 b_ptr->blocked = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100611 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
David S. Miller6c000552008-09-02 23:38:32 -0700612 struct tipc_node *n_ptr = l_ptr->owner;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100613
614 spin_lock_bh(&n_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100615 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100616 spin_unlock_bh(&n_ptr->lock);
617 }
Allan Stephens2d627b92011-01-07 13:00:11 -0500618 spin_unlock_bh(&b_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100619 read_unlock_bh(&tipc_net_lock);
Allan Stephens0e35fd52008-07-14 22:44:01 -0700620 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100621}
622
623/**
624 * bearer_disable -
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900625 *
Per Liden4323add2006-01-18 00:38:21 +0100626 * Note: This routine assumes caller holds tipc_net_lock.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100627 */
628
Allan Stephens2d627b92011-01-07 13:00:11 -0500629static void bearer_disable(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100630{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100631 struct link *l_ptr;
632 struct link *temp_l_ptr;
633
Allan Stephens2d627b92011-01-07 13:00:11 -0500634 info("Disabling bearer <%s>\n", b_ptr->name);
Allan Stephens2d627b92011-01-07 13:00:11 -0500635 spin_lock_bh(&b_ptr->lock);
Allan Stephens2d627b92011-01-07 13:00:11 -0500636 b_ptr->blocked = 1;
637 b_ptr->media->disable_bearer(b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100638 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
Per Liden4323add2006-01-18 00:38:21 +0100639 tipc_link_delete(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100640 }
Allan Stephens3a777ff2011-04-21 13:58:26 -0500641 if (b_ptr->link_req)
642 tipc_disc_delete(b_ptr->link_req);
Allan Stephens2d627b92011-01-07 13:00:11 -0500643 spin_unlock_bh(&b_ptr->lock);
644 memset(b_ptr, 0, sizeof(struct tipc_bearer));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100645}
646
647int tipc_disable_bearer(const char *name)
648{
Allan Stephens2d627b92011-01-07 13:00:11 -0500649 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100650 int res;
651
Per Liden4323add2006-01-18 00:38:21 +0100652 write_lock_bh(&tipc_net_lock);
Allan Stephensccc901e2010-10-14 13:58:26 +0000653 b_ptr = bearer_find(name);
654 if (b_ptr == NULL) {
655 warn("Attempt to disable unknown bearer <%s>\n", name);
656 res = -EINVAL;
Allan Stephens28cc9372010-11-30 12:00:56 +0000657 } else {
658 bearer_disable(b_ptr);
659 res = 0;
660 }
Per Liden4323add2006-01-18 00:38:21 +0100661 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100662 return res;
663}
664
665
666
Per Liden4323add2006-01-18 00:38:21 +0100667void tipc_bearer_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100668{
669 u32 i;
670
Per Lidenb97bf3f2006-01-02 19:04:38 +0100671 for (i = 0; i < MAX_BEARERS; i++) {
Per Liden4323add2006-01-18 00:38:21 +0100672 if (tipc_bearers[i].active)
Allan Stephensccc901e2010-10-14 13:58:26 +0000673 bearer_disable(&tipc_bearers[i]);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100674 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100675 media_count = 0;
676}