blob: bc655f4564957d1a9f1253082e8989b84cd926dd [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 *
Allan Stephens05646c92007-06-10 17:25:24 -07004 * Copyright (c) 1996-2007, Ericsson AB
Allan Stephens23dd4cc2011-01-07 11:43:40 -05005 * Copyright (c) 2004-2007, 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"
Per Lidenb97bf3f2006-01-02 19:04:38 +010038#include "link.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010039#include "port.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010040#include "name_distr.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010041#include "discover.h"
42#include "config.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010043
44
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090045/*
Allan Stephensa686e682008-06-04 17:29:39 -070046 * Out-of-range value for link session numbers
47 */
48
49#define INVALID_SESSION 0x10000
50
51/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090052 * Link state events:
Per Lidenb97bf3f2006-01-02 19:04:38 +010053 */
54
55#define STARTING_EVT 856384768 /* link processing trigger */
56#define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
57#define TIMEOUT_EVT 560817u /* link timer expired */
58
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090059/*
60 * The following two 'message types' is really just implementation
61 * data conveniently stored in the message header.
Per Lidenb97bf3f2006-01-02 19:04:38 +010062 * They must not be considered part of the protocol
63 */
64#define OPEN_MSG 0
65#define CLOSED_MSG 1
66
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090067/*
Per Lidenb97bf3f2006-01-02 19:04:38 +010068 * State value stored in 'exp_msg_count'
69 */
70
71#define START_CHANGEOVER 100000u
72
73/**
74 * struct link_name - deconstructed link name
75 * @addr_local: network address of node at this end
76 * @if_local: name of interface at this end
77 * @addr_peer: network address of node at far end
78 * @if_peer: name of interface at far end
79 */
80
81struct link_name {
82 u32 addr_local;
83 char if_local[TIPC_MAX_IF_NAME];
84 u32 addr_peer;
85 char if_peer[TIPC_MAX_IF_NAME];
86};
87
Per Lidenb97bf3f2006-01-02 19:04:38 +010088static void link_handle_out_of_seq_msg(struct link *l_ptr,
89 struct sk_buff *buf);
90static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf);
91static int link_recv_changeover_msg(struct link **l_ptr, struct sk_buff **buf);
92static void link_set_supervision_props(struct link *l_ptr, u32 tolerance);
Allan Stephens23dd4cc2011-01-07 11:43:40 -050093static int link_send_sections_long(struct tipc_port *sender,
Per Lidenb97bf3f2006-01-02 19:04:38 +010094 struct iovec const *msg_sect,
Allan Stephens26896902011-04-21 10:42:07 -050095 u32 num_sect, unsigned int total_len,
96 u32 destnode);
Per Lidenb97bf3f2006-01-02 19:04:38 +010097static void link_check_defragm_bufs(struct link *l_ptr);
98static void link_state_event(struct link *l_ptr, u32 event);
99static void link_reset_statistics(struct link *l_ptr);
Allan Stephens8d64a5b2010-12-31 18:59:27 +0000100static void link_print(struct link *l_ptr, const char *str);
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000101static void link_start(struct link *l_ptr);
102static int link_send_long_buf(struct link *l_ptr, struct sk_buff *buf);
103
Per Lidenb97bf3f2006-01-02 19:04:38 +0100104/*
Sam Ravnborg05790c62006-03-20 22:37:04 -0800105 * Simple link routines
Per Lidenb97bf3f2006-01-02 19:04:38 +0100106 */
107
Sam Ravnborg05790c62006-03-20 22:37:04 -0800108static unsigned int align(unsigned int i)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100109{
110 return (i + 3) & ~3u;
111}
112
Sam Ravnborg05790c62006-03-20 22:37:04 -0800113static void link_init_max_pkt(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100114{
115 u32 max_pkt;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900116
Allan Stephens2d627b92011-01-07 13:00:11 -0500117 max_pkt = (l_ptr->b_ptr->mtu & ~3);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100118 if (max_pkt > MAX_MSG_SIZE)
119 max_pkt = MAX_MSG_SIZE;
120
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900121 l_ptr->max_pkt_target = max_pkt;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100122 if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT)
123 l_ptr->max_pkt = l_ptr->max_pkt_target;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900124 else
Per Lidenb97bf3f2006-01-02 19:04:38 +0100125 l_ptr->max_pkt = MAX_PKT_DEFAULT;
126
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900127 l_ptr->max_pkt_probes = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100128}
129
Sam Ravnborg05790c62006-03-20 22:37:04 -0800130static u32 link_next_sent(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100131{
132 if (l_ptr->next_out)
133 return msg_seqno(buf_msg(l_ptr->next_out));
134 return mod(l_ptr->next_out_no);
135}
136
Sam Ravnborg05790c62006-03-20 22:37:04 -0800137static u32 link_last_sent(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100138{
139 return mod(link_next_sent(l_ptr) - 1);
140}
141
142/*
Sam Ravnborg05790c62006-03-20 22:37:04 -0800143 * Simple non-static link routines (i.e. referenced outside this file)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100144 */
145
Per Liden4323add2006-01-18 00:38:21 +0100146int tipc_link_is_up(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100147{
148 if (!l_ptr)
149 return 0;
Eric Dumazeta02cec22010-09-22 20:43:57 +0000150 return link_working_working(l_ptr) || link_working_unknown(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100151}
152
Per Liden4323add2006-01-18 00:38:21 +0100153int tipc_link_is_active(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100154{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000155 return (l_ptr->owner->active_links[0] == l_ptr) ||
156 (l_ptr->owner->active_links[1] == l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100157}
158
159/**
160 * link_name_validate - validate & (optionally) deconstruct link name
161 * @name - ptr to link name string
162 * @name_parts - ptr to area for link name components (or NULL if not needed)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900163 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100164 * Returns 1 if link name is valid, otherwise 0.
165 */
166
167static int link_name_validate(const char *name, struct link_name *name_parts)
168{
169 char name_copy[TIPC_MAX_LINK_NAME];
170 char *addr_local;
171 char *if_local;
172 char *addr_peer;
173 char *if_peer;
174 char dummy;
175 u32 z_local, c_local, n_local;
176 u32 z_peer, c_peer, n_peer;
177 u32 if_local_len;
178 u32 if_peer_len;
179
180 /* copy link name & ensure length is OK */
181
182 name_copy[TIPC_MAX_LINK_NAME - 1] = 0;
183 /* need above in case non-Posix strncpy() doesn't pad with nulls */
184 strncpy(name_copy, name, TIPC_MAX_LINK_NAME);
185 if (name_copy[TIPC_MAX_LINK_NAME - 1] != 0)
186 return 0;
187
188 /* ensure all component parts of link name are present */
189
190 addr_local = name_copy;
Allan Stephens2db99832010-12-31 18:59:33 +0000191 if_local = strchr(addr_local, ':');
192 if (if_local == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100193 return 0;
194 *(if_local++) = 0;
Allan Stephens2db99832010-12-31 18:59:33 +0000195 addr_peer = strchr(if_local, '-');
196 if (addr_peer == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100197 return 0;
198 *(addr_peer++) = 0;
199 if_local_len = addr_peer - if_local;
Allan Stephens2db99832010-12-31 18:59:33 +0000200 if_peer = strchr(addr_peer, ':');
201 if (if_peer == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100202 return 0;
203 *(if_peer++) = 0;
204 if_peer_len = strlen(if_peer) + 1;
205
206 /* validate component parts of link name */
207
208 if ((sscanf(addr_local, "%u.%u.%u%c",
209 &z_local, &c_local, &n_local, &dummy) != 3) ||
210 (sscanf(addr_peer, "%u.%u.%u%c",
211 &z_peer, &c_peer, &n_peer, &dummy) != 3) ||
212 (z_local > 255) || (c_local > 4095) || (n_local > 4095) ||
213 (z_peer > 255) || (c_peer > 4095) || (n_peer > 4095) ||
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900214 (if_local_len <= 1) || (if_local_len > TIPC_MAX_IF_NAME) ||
215 (if_peer_len <= 1) || (if_peer_len > TIPC_MAX_IF_NAME) ||
Per Lidenb97bf3f2006-01-02 19:04:38 +0100216 (strspn(if_local, tipc_alphabet) != (if_local_len - 1)) ||
217 (strspn(if_peer, tipc_alphabet) != (if_peer_len - 1)))
218 return 0;
219
220 /* return link name components, if necessary */
221
222 if (name_parts) {
223 name_parts->addr_local = tipc_addr(z_local, c_local, n_local);
224 strcpy(name_parts->if_local, if_local);
225 name_parts->addr_peer = tipc_addr(z_peer, c_peer, n_peer);
226 strcpy(name_parts->if_peer, if_peer);
227 }
228 return 1;
229}
230
231/**
232 * link_timeout - handle expiration of link timer
233 * @l_ptr: pointer to link
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900234 *
Per Liden4323add2006-01-18 00:38:21 +0100235 * This routine must not grab "tipc_net_lock" to avoid a potential deadlock conflict
236 * with tipc_link_delete(). (There is no risk that the node will be deleted by
237 * another thread because tipc_link_delete() always cancels the link timer before
238 * tipc_node_delete() is called.)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100239 */
240
241static void link_timeout(struct link *l_ptr)
242{
Per Liden4323add2006-01-18 00:38:21 +0100243 tipc_node_lock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100244
245 /* update counters used in statistical profiling of send traffic */
246
247 l_ptr->stats.accu_queue_sz += l_ptr->out_queue_size;
248 l_ptr->stats.queue_sz_counts++;
249
Per Lidenb97bf3f2006-01-02 19:04:38 +0100250 if (l_ptr->first_out) {
251 struct tipc_msg *msg = buf_msg(l_ptr->first_out);
252 u32 length = msg_size(msg);
253
Joe Perchesf64f9e72009-11-29 16:55:45 -0800254 if ((msg_user(msg) == MSG_FRAGMENTER) &&
255 (msg_type(msg) == FIRST_FRAGMENT)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100256 length = msg_size(msg_get_wrapped(msg));
257 }
258 if (length) {
259 l_ptr->stats.msg_lengths_total += length;
260 l_ptr->stats.msg_length_counts++;
261 if (length <= 64)
262 l_ptr->stats.msg_length_profile[0]++;
263 else if (length <= 256)
264 l_ptr->stats.msg_length_profile[1]++;
265 else if (length <= 1024)
266 l_ptr->stats.msg_length_profile[2]++;
267 else if (length <= 4096)
268 l_ptr->stats.msg_length_profile[3]++;
269 else if (length <= 16384)
270 l_ptr->stats.msg_length_profile[4]++;
271 else if (length <= 32768)
272 l_ptr->stats.msg_length_profile[5]++;
273 else
274 l_ptr->stats.msg_length_profile[6]++;
275 }
276 }
277
278 /* do all other link processing performed on a periodic basis */
279
280 link_check_defragm_bufs(l_ptr);
281
282 link_state_event(l_ptr, TIMEOUT_EVT);
283
284 if (l_ptr->next_out)
Per Liden4323add2006-01-18 00:38:21 +0100285 tipc_link_push_queue(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100286
Per Liden4323add2006-01-18 00:38:21 +0100287 tipc_node_unlock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100288}
289
Sam Ravnborg05790c62006-03-20 22:37:04 -0800290static void link_set_timer(struct link *l_ptr, u32 time)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100291{
292 k_start_timer(&l_ptr->timer, time);
293}
294
295/**
Per Liden4323add2006-01-18 00:38:21 +0100296 * tipc_link_create - create a new link
Allan Stephens37b9c082011-02-28 11:32:27 -0500297 * @n_ptr: pointer to associated node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100298 * @b_ptr: pointer to associated bearer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100299 * @media_addr: media address to use when sending messages over link
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900300 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100301 * Returns pointer to link.
302 */
303
Allan Stephens37b9c082011-02-28 11:32:27 -0500304struct link *tipc_link_create(struct tipc_node *n_ptr,
305 struct tipc_bearer *b_ptr,
Per Liden4323add2006-01-18 00:38:21 +0100306 const struct tipc_media_addr *media_addr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100307{
308 struct link *l_ptr;
309 struct tipc_msg *msg;
310 char *if_name;
Allan Stephens37b9c082011-02-28 11:32:27 -0500311 char addr_string[16];
312 u32 peer = n_ptr->addr;
313
314 if (n_ptr->link_cnt >= 2) {
315 tipc_addr_string_fill(addr_string, n_ptr->addr);
316 err("Attempt to establish third link to %s\n", addr_string);
317 return NULL;
318 }
319
320 if (n_ptr->links[b_ptr->identity]) {
321 tipc_addr_string_fill(addr_string, n_ptr->addr);
322 err("Attempt to establish second link on <%s> to %s\n",
323 b_ptr->name, addr_string);
324 return NULL;
325 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100326
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700327 l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100328 if (!l_ptr) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700329 warn("Link creation failed, no memory\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100330 return NULL;
331 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100332
333 l_ptr->addr = peer;
Allan Stephens2d627b92011-01-07 13:00:11 -0500334 if_name = strchr(b_ptr->name, ':') + 1;
Allan Stephens062b4c92011-04-07 09:28:47 -0400335 sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
Per Lidenb97bf3f2006-01-02 19:04:38 +0100336 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900337 tipc_node(tipc_own_addr),
Per Lidenb97bf3f2006-01-02 19:04:38 +0100338 if_name,
339 tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
Allan Stephens062b4c92011-04-07 09:28:47 -0400340 /* note: peer i/f name is updated by reset/activate message */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100341 memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
Allan Stephens37b9c082011-02-28 11:32:27 -0500342 l_ptr->owner = n_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100343 l_ptr->checkpoint = 1;
Allan Stephensf882cb72011-04-07 09:43:27 -0400344 l_ptr->peer_session = INVALID_SESSION;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100345 l_ptr->b_ptr = b_ptr;
346 link_set_supervision_props(l_ptr, b_ptr->media->tolerance);
347 l_ptr->state = RESET_UNKNOWN;
348
349 l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
350 msg = l_ptr->pmsg;
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000351 tipc_msg_init(msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, l_ptr->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100352 msg_set_size(msg, sizeof(l_ptr->proto_msg));
Allan Stephensa686e682008-06-04 17:29:39 -0700353 msg_set_session(msg, (tipc_random & 0xffff));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100354 msg_set_bearer_id(msg, b_ptr->identity);
355 strcpy((char *)msg_data(msg), if_name);
356
357 l_ptr->priority = b_ptr->priority;
Per Liden4323add2006-01-18 00:38:21 +0100358 tipc_link_set_queue_limits(l_ptr, b_ptr->media->window);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100359
360 link_init_max_pkt(l_ptr);
361
362 l_ptr->next_out_no = 1;
363 INIT_LIST_HEAD(&l_ptr->waiting_ports);
364
365 link_reset_statistics(l_ptr);
366
Allan Stephens37b9c082011-02-28 11:32:27 -0500367 tipc_node_attach_link(n_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100368
Florian Westphal945710652007-07-26 00:05:07 -0700369 k_init_timer(&l_ptr->timer, (Handler)link_timeout, (unsigned long)l_ptr);
370 list_add_tail(&l_ptr->link_list, &b_ptr->links);
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000371 tipc_k_signal((Handler)link_start, (unsigned long)l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100372
Per Lidenb97bf3f2006-01-02 19:04:38 +0100373 return l_ptr;
374}
375
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900376/**
Per Liden4323add2006-01-18 00:38:21 +0100377 * tipc_link_delete - delete a link
Per Lidenb97bf3f2006-01-02 19:04:38 +0100378 * @l_ptr: pointer to link
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900379 *
Per Liden4323add2006-01-18 00:38:21 +0100380 * Note: 'tipc_net_lock' is write_locked, bearer is locked.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100381 * This routine must not grab the node lock until after link timer cancellation
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900382 * to avoid a potential deadlock situation.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100383 */
384
Per Liden4323add2006-01-18 00:38:21 +0100385void tipc_link_delete(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100386{
387 if (!l_ptr) {
388 err("Attempt to delete non-existent link\n");
389 return;
390 }
391
Per Lidenb97bf3f2006-01-02 19:04:38 +0100392 k_cancel_timer(&l_ptr->timer);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900393
Per Liden4323add2006-01-18 00:38:21 +0100394 tipc_node_lock(l_ptr->owner);
395 tipc_link_reset(l_ptr);
396 tipc_node_detach_link(l_ptr->owner, l_ptr);
397 tipc_link_stop(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100398 list_del_init(&l_ptr->link_list);
Per Liden4323add2006-01-18 00:38:21 +0100399 tipc_node_unlock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100400 k_term_timer(&l_ptr->timer);
401 kfree(l_ptr);
402}
403
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000404static void link_start(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100405{
Allan Stephens214dda42011-01-24 16:22:43 -0500406 tipc_node_lock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100407 link_state_event(l_ptr, STARTING_EVT);
Allan Stephens214dda42011-01-24 16:22:43 -0500408 tipc_node_unlock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100409}
410
411/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900412 * link_schedule_port - schedule port for deferred sending
Per Lidenb97bf3f2006-01-02 19:04:38 +0100413 * @l_ptr: pointer to link
414 * @origport: reference to sending port
415 * @sz: amount of data to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900416 *
417 * Schedules port for renewed sending of messages after link congestion
Per Lidenb97bf3f2006-01-02 19:04:38 +0100418 * has abated.
419 */
420
421static int link_schedule_port(struct link *l_ptr, u32 origport, u32 sz)
422{
Allan Stephens23dd4cc2011-01-07 11:43:40 -0500423 struct tipc_port *p_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100424
Per Liden4323add2006-01-18 00:38:21 +0100425 spin_lock_bh(&tipc_port_list_lock);
426 p_ptr = tipc_port_lock(origport);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100427 if (p_ptr) {
428 if (!p_ptr->wakeup)
429 goto exit;
430 if (!list_empty(&p_ptr->wait_list))
431 goto exit;
Allan Stephens23dd4cc2011-01-07 11:43:40 -0500432 p_ptr->congested = 1;
Allan Stephens15e979d2010-05-11 14:30:10 +0000433 p_ptr->waiting_pkts = 1 + ((sz - 1) / l_ptr->max_pkt);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100434 list_add_tail(&p_ptr->wait_list, &l_ptr->waiting_ports);
435 l_ptr->stats.link_congs++;
436exit:
Per Liden4323add2006-01-18 00:38:21 +0100437 tipc_port_unlock(p_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100438 }
Per Liden4323add2006-01-18 00:38:21 +0100439 spin_unlock_bh(&tipc_port_list_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100440 return -ELINKCONG;
441}
442
Per Liden4323add2006-01-18 00:38:21 +0100443void tipc_link_wakeup_ports(struct link *l_ptr, int all)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100444{
Allan Stephens23dd4cc2011-01-07 11:43:40 -0500445 struct tipc_port *p_ptr;
446 struct tipc_port *temp_p_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100447 int win = l_ptr->queue_limit[0] - l_ptr->out_queue_size;
448
449 if (all)
450 win = 100000;
451 if (win <= 0)
452 return;
Per Liden4323add2006-01-18 00:38:21 +0100453 if (!spin_trylock_bh(&tipc_port_list_lock))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100454 return;
455 if (link_congested(l_ptr))
456 goto exit;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900457 list_for_each_entry_safe(p_ptr, temp_p_ptr, &l_ptr->waiting_ports,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100458 wait_list) {
459 if (win <= 0)
460 break;
461 list_del_init(&p_ptr->wait_list);
Allan Stephens23dd4cc2011-01-07 11:43:40 -0500462 spin_lock_bh(p_ptr->lock);
463 p_ptr->congested = 0;
464 p_ptr->wakeup(p_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100465 win -= p_ptr->waiting_pkts;
Allan Stephens23dd4cc2011-01-07 11:43:40 -0500466 spin_unlock_bh(p_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100467 }
468
469exit:
Per Liden4323add2006-01-18 00:38:21 +0100470 spin_unlock_bh(&tipc_port_list_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100471}
472
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900473/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100474 * link_release_outqueue - purge link's outbound message queue
475 * @l_ptr: pointer to link
476 */
477
478static void link_release_outqueue(struct link *l_ptr)
479{
480 struct sk_buff *buf = l_ptr->first_out;
481 struct sk_buff *next;
482
483 while (buf) {
484 next = buf->next;
485 buf_discard(buf);
486 buf = next;
487 }
488 l_ptr->first_out = NULL;
489 l_ptr->out_queue_size = 0;
490}
491
492/**
Per Liden4323add2006-01-18 00:38:21 +0100493 * tipc_link_reset_fragments - purge link's inbound message fragments queue
Per Lidenb97bf3f2006-01-02 19:04:38 +0100494 * @l_ptr: pointer to link
495 */
496
Per Liden4323add2006-01-18 00:38:21 +0100497void tipc_link_reset_fragments(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100498{
499 struct sk_buff *buf = l_ptr->defragm_buf;
500 struct sk_buff *next;
501
502 while (buf) {
503 next = buf->next;
504 buf_discard(buf);
505 buf = next;
506 }
507 l_ptr->defragm_buf = NULL;
508}
509
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900510/**
Per Liden4323add2006-01-18 00:38:21 +0100511 * tipc_link_stop - purge all inbound and outbound messages associated with link
Per Lidenb97bf3f2006-01-02 19:04:38 +0100512 * @l_ptr: pointer to link
513 */
514
Per Liden4323add2006-01-18 00:38:21 +0100515void tipc_link_stop(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100516{
517 struct sk_buff *buf;
518 struct sk_buff *next;
519
520 buf = l_ptr->oldest_deferred_in;
521 while (buf) {
522 next = buf->next;
523 buf_discard(buf);
524 buf = next;
525 }
526
527 buf = l_ptr->first_out;
528 while (buf) {
529 next = buf->next;
530 buf_discard(buf);
531 buf = next;
532 }
533
Per Liden4323add2006-01-18 00:38:21 +0100534 tipc_link_reset_fragments(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100535
536 buf_discard(l_ptr->proto_msg_queue);
537 l_ptr->proto_msg_queue = NULL;
538}
539
Per Lidenb97bf3f2006-01-02 19:04:38 +0100540/* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100541#define link_send_event(fcn, l_ptr, up) do { } while (0)
542
Per Liden4323add2006-01-18 00:38:21 +0100543void tipc_link_reset(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100544{
545 struct sk_buff *buf;
546 u32 prev_state = l_ptr->state;
547 u32 checkpoint = l_ptr->next_in_no;
Allan Stephens5392d642006-06-25 23:52:50 -0700548 int was_active_link = tipc_link_is_active(l_ptr);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900549
Allan Stephensa686e682008-06-04 17:29:39 -0700550 msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100551
Allan Stephensa686e682008-06-04 17:29:39 -0700552 /* Link is down, accept any session */
553 l_ptr->peer_session = INVALID_SESSION;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100554
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900555 /* Prepare for max packet size negotiation */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100556 link_init_max_pkt(l_ptr);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900557
Per Lidenb97bf3f2006-01-02 19:04:38 +0100558 l_ptr->state = RESET_UNKNOWN;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100559
560 if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
561 return;
562
Per Liden4323add2006-01-18 00:38:21 +0100563 tipc_node_link_down(l_ptr->owner, l_ptr);
564 tipc_bearer_remove_dest(l_ptr->b_ptr, l_ptr->addr);
Paul Gortmaker7368ddf2010-10-12 14:25:58 +0000565
Paul Gortmaker8f19afb2011-02-28 11:36:21 -0400566 if (was_active_link && tipc_node_active_links(l_ptr->owner) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100567 l_ptr->owner->permit_changeover) {
568 l_ptr->reset_checkpoint = checkpoint;
569 l_ptr->exp_msg_count = START_CHANGEOVER;
570 }
571
572 /* Clean up all queues: */
573
574 link_release_outqueue(l_ptr);
575 buf_discard(l_ptr->proto_msg_queue);
576 l_ptr->proto_msg_queue = NULL;
577 buf = l_ptr->oldest_deferred_in;
578 while (buf) {
579 struct sk_buff *next = buf->next;
580 buf_discard(buf);
581 buf = next;
582 }
583 if (!list_empty(&l_ptr->waiting_ports))
Per Liden4323add2006-01-18 00:38:21 +0100584 tipc_link_wakeup_ports(l_ptr, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100585
586 l_ptr->retransm_queue_head = 0;
587 l_ptr->retransm_queue_size = 0;
588 l_ptr->last_out = NULL;
589 l_ptr->first_out = NULL;
590 l_ptr->next_out = NULL;
591 l_ptr->unacked_window = 0;
592 l_ptr->checkpoint = 1;
593 l_ptr->next_out_no = 1;
594 l_ptr->deferred_inqueue_sz = 0;
595 l_ptr->oldest_deferred_in = NULL;
596 l_ptr->newest_deferred_in = NULL;
597 l_ptr->fsm_msg_cnt = 0;
598 l_ptr->stale_count = 0;
599 link_reset_statistics(l_ptr);
600
Per Liden4323add2006-01-18 00:38:21 +0100601 link_send_event(tipc_cfg_link_event, l_ptr, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100602 if (!in_own_cluster(l_ptr->addr))
Per Liden4323add2006-01-18 00:38:21 +0100603 link_send_event(tipc_disc_link_event, l_ptr, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100604}
605
606
607static void link_activate(struct link *l_ptr)
608{
Allan Stephens5392d642006-06-25 23:52:50 -0700609 l_ptr->next_in_no = l_ptr->stats.recv_info = 1;
Per Liden4323add2006-01-18 00:38:21 +0100610 tipc_node_link_up(l_ptr->owner, l_ptr);
611 tipc_bearer_add_dest(l_ptr->b_ptr, l_ptr->addr);
612 link_send_event(tipc_cfg_link_event, l_ptr, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100613 if (!in_own_cluster(l_ptr->addr))
Per Liden4323add2006-01-18 00:38:21 +0100614 link_send_event(tipc_disc_link_event, l_ptr, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100615}
616
617/**
618 * link_state_event - link finite state machine
619 * @l_ptr: pointer to link
620 * @event: state machine event to process
621 */
622
623static void link_state_event(struct link *l_ptr, unsigned event)
624{
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900625 struct link *other;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100626 u32 cont_intv = l_ptr->continuity_interval;
627
628 if (!l_ptr->started && (event != STARTING_EVT))
629 return; /* Not yet. */
630
631 if (link_blocked(l_ptr)) {
Allan Stephensa0168922010-12-31 18:59:35 +0000632 if (event == TIMEOUT_EVT)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100633 link_set_timer(l_ptr, cont_intv);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100634 return; /* Changeover going on */
635 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100636
637 switch (l_ptr->state) {
638 case WORKING_WORKING:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100639 switch (event) {
640 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100641 case ACTIVATE_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100642 break;
643 case TIMEOUT_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100644 if (l_ptr->next_in_no != l_ptr->checkpoint) {
645 l_ptr->checkpoint = l_ptr->next_in_no;
Per Liden4323add2006-01-18 00:38:21 +0100646 if (tipc_bclink_acks_missing(l_ptr->owner)) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900647 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
Per Liden4323add2006-01-18 00:38:21 +0100648 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100649 l_ptr->fsm_msg_cnt++;
650 } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900651 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
Per Liden4323add2006-01-18 00:38:21 +0100652 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100653 l_ptr->fsm_msg_cnt++;
654 }
655 link_set_timer(l_ptr, cont_intv);
656 break;
657 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100658 l_ptr->state = WORKING_UNKNOWN;
659 l_ptr->fsm_msg_cnt = 0;
Per Liden4323add2006-01-18 00:38:21 +0100660 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100661 l_ptr->fsm_msg_cnt++;
662 link_set_timer(l_ptr, cont_intv / 4);
663 break;
664 case RESET_MSG:
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900665 info("Resetting link <%s>, requested by peer\n",
Allan Stephensa10bd922006-06-25 23:52:17 -0700666 l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100667 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100668 l_ptr->state = RESET_RESET;
669 l_ptr->fsm_msg_cnt = 0;
Per Liden4323add2006-01-18 00:38:21 +0100670 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100671 l_ptr->fsm_msg_cnt++;
672 link_set_timer(l_ptr, cont_intv);
673 break;
674 default:
675 err("Unknown link event %u in WW state\n", event);
676 }
677 break;
678 case WORKING_UNKNOWN:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100679 switch (event) {
680 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100681 case ACTIVATE_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100682 l_ptr->state = WORKING_WORKING;
683 l_ptr->fsm_msg_cnt = 0;
684 link_set_timer(l_ptr, cont_intv);
685 break;
686 case RESET_MSG:
Allan Stephensa10bd922006-06-25 23:52:17 -0700687 info("Resetting link <%s>, requested by peer "
688 "while probing\n", l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100689 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100690 l_ptr->state = RESET_RESET;
691 l_ptr->fsm_msg_cnt = 0;
Per Liden4323add2006-01-18 00:38:21 +0100692 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100693 l_ptr->fsm_msg_cnt++;
694 link_set_timer(l_ptr, cont_intv);
695 break;
696 case TIMEOUT_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100697 if (l_ptr->next_in_no != l_ptr->checkpoint) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100698 l_ptr->state = WORKING_WORKING;
699 l_ptr->fsm_msg_cnt = 0;
700 l_ptr->checkpoint = l_ptr->next_in_no;
Per Liden4323add2006-01-18 00:38:21 +0100701 if (tipc_bclink_acks_missing(l_ptr->owner)) {
702 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
703 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100704 l_ptr->fsm_msg_cnt++;
705 }
706 link_set_timer(l_ptr, cont_intv);
707 } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900708 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
Per Liden4323add2006-01-18 00:38:21 +0100709 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100710 l_ptr->fsm_msg_cnt++;
711 link_set_timer(l_ptr, cont_intv / 4);
712 } else { /* Link has failed */
Allan Stephensa10bd922006-06-25 23:52:17 -0700713 warn("Resetting link <%s>, peer not responding\n",
714 l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100715 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100716 l_ptr->state = RESET_UNKNOWN;
717 l_ptr->fsm_msg_cnt = 0;
Per Liden4323add2006-01-18 00:38:21 +0100718 tipc_link_send_proto_msg(l_ptr, RESET_MSG,
719 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100720 l_ptr->fsm_msg_cnt++;
721 link_set_timer(l_ptr, cont_intv);
722 }
723 break;
724 default:
725 err("Unknown link event %u in WU state\n", event);
726 }
727 break;
728 case RESET_UNKNOWN:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100729 switch (event) {
730 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100731 break;
732 case ACTIVATE_MSG:
733 other = l_ptr->owner->active_links[0];
Allan Stephens8d64a5b2010-12-31 18:59:27 +0000734 if (other && link_working_unknown(other))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100735 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100736 l_ptr->state = WORKING_WORKING;
737 l_ptr->fsm_msg_cnt = 0;
738 link_activate(l_ptr);
Per Liden4323add2006-01-18 00:38:21 +0100739 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100740 l_ptr->fsm_msg_cnt++;
741 link_set_timer(l_ptr, cont_intv);
742 break;
743 case RESET_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100744 l_ptr->state = RESET_RESET;
745 l_ptr->fsm_msg_cnt = 0;
Per Liden4323add2006-01-18 00:38:21 +0100746 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100747 l_ptr->fsm_msg_cnt++;
748 link_set_timer(l_ptr, cont_intv);
749 break;
750 case STARTING_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100751 l_ptr->started = 1;
752 /* fall through */
753 case TIMEOUT_EVT:
Per Liden4323add2006-01-18 00:38:21 +0100754 tipc_link_send_proto_msg(l_ptr, RESET_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100755 l_ptr->fsm_msg_cnt++;
756 link_set_timer(l_ptr, cont_intv);
757 break;
758 default:
759 err("Unknown link event %u in RU state\n", event);
760 }
761 break;
762 case RESET_RESET:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100763 switch (event) {
764 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100765 case ACTIVATE_MSG:
766 other = l_ptr->owner->active_links[0];
Allan Stephens8d64a5b2010-12-31 18:59:27 +0000767 if (other && link_working_unknown(other))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100768 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100769 l_ptr->state = WORKING_WORKING;
770 l_ptr->fsm_msg_cnt = 0;
771 link_activate(l_ptr);
Per Liden4323add2006-01-18 00:38:21 +0100772 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100773 l_ptr->fsm_msg_cnt++;
774 link_set_timer(l_ptr, cont_intv);
775 break;
776 case RESET_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100777 break;
778 case TIMEOUT_EVT:
Per Liden4323add2006-01-18 00:38:21 +0100779 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100780 l_ptr->fsm_msg_cnt++;
781 link_set_timer(l_ptr, cont_intv);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100782 break;
783 default:
784 err("Unknown link event %u in RR state\n", event);
785 }
786 break;
787 default:
788 err("Unknown link state %u/%u\n", l_ptr->state, event);
789 }
790}
791
792/*
793 * link_bundle_buf(): Append contents of a buffer to
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900794 * the tail of an existing one.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100795 */
796
797static int link_bundle_buf(struct link *l_ptr,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900798 struct sk_buff *bundler,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100799 struct sk_buff *buf)
800{
801 struct tipc_msg *bundler_msg = buf_msg(bundler);
802 struct tipc_msg *msg = buf_msg(buf);
803 u32 size = msg_size(msg);
Allan Stephense49060c2006-06-29 12:32:46 -0700804 u32 bundle_size = msg_size(bundler_msg);
805 u32 to_pos = align(bundle_size);
806 u32 pad = to_pos - bundle_size;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100807
808 if (msg_user(bundler_msg) != MSG_BUNDLER)
809 return 0;
810 if (msg_type(bundler_msg) != OPEN_MSG)
811 return 0;
Allan Stephense49060c2006-06-29 12:32:46 -0700812 if (skb_tailroom(bundler) < (pad + size))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100813 return 0;
Allan Stephens15e979d2010-05-11 14:30:10 +0000814 if (l_ptr->max_pkt < (to_pos + size))
Allan Stephens863fae62006-07-03 19:39:36 -0700815 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100816
Allan Stephense49060c2006-06-29 12:32:46 -0700817 skb_put(bundler, pad + size);
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -0300818 skb_copy_to_linear_data_offset(bundler, to_pos, buf->data, size);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100819 msg_set_size(bundler_msg, to_pos + size);
820 msg_set_msgcnt(bundler_msg, msg_msgcnt(bundler_msg) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100821 buf_discard(buf);
822 l_ptr->stats.sent_bundled++;
823 return 1;
824}
825
Sam Ravnborg05790c62006-03-20 22:37:04 -0800826static void link_add_to_outqueue(struct link *l_ptr,
827 struct sk_buff *buf,
828 struct tipc_msg *msg)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100829{
830 u32 ack = mod(l_ptr->next_in_no - 1);
831 u32 seqno = mod(l_ptr->next_out_no++);
832
833 msg_set_word(msg, 2, ((ack << 16) | seqno));
834 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
835 buf->next = NULL;
836 if (l_ptr->first_out) {
837 l_ptr->last_out->next = buf;
838 l_ptr->last_out = buf;
839 } else
840 l_ptr->first_out = l_ptr->last_out = buf;
Allan Stephens9bd80b62011-01-18 15:02:50 -0500841
Per Lidenb97bf3f2006-01-02 19:04:38 +0100842 l_ptr->out_queue_size++;
Allan Stephens9bd80b62011-01-18 15:02:50 -0500843 if (l_ptr->out_queue_size > l_ptr->stats.max_queue_sz)
844 l_ptr->stats.max_queue_sz = l_ptr->out_queue_size;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100845}
846
Allan Stephensdc63d912011-04-21 11:50:42 -0400847static void link_add_chain_to_outqueue(struct link *l_ptr,
848 struct sk_buff *buf_chain,
849 u32 long_msgno)
850{
851 struct sk_buff *buf;
852 struct tipc_msg *msg;
853
854 if (!l_ptr->next_out)
855 l_ptr->next_out = buf_chain;
856 while (buf_chain) {
857 buf = buf_chain;
858 buf_chain = buf_chain->next;
859
860 msg = buf_msg(buf);
861 msg_set_long_msgno(msg, long_msgno);
862 link_add_to_outqueue(l_ptr, buf, msg);
863 }
864}
865
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900866/*
867 * tipc_link_send_buf() is the 'full path' for messages, called from
Per Lidenb97bf3f2006-01-02 19:04:38 +0100868 * inside TIPC when the 'fast path' in tipc_send_buf
869 * has failed, and from link_send()
870 */
871
Per Liden4323add2006-01-18 00:38:21 +0100872int tipc_link_send_buf(struct link *l_ptr, struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100873{
874 struct tipc_msg *msg = buf_msg(buf);
875 u32 size = msg_size(msg);
876 u32 dsz = msg_data_sz(msg);
877 u32 queue_size = l_ptr->out_queue_size;
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000878 u32 imp = tipc_msg_tot_importance(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100879 u32 queue_limit = l_ptr->queue_limit[imp];
Allan Stephens15e979d2010-05-11 14:30:10 +0000880 u32 max_packet = l_ptr->max_pkt;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100881
882 msg_set_prevnode(msg, tipc_own_addr); /* If routed message */
883
884 /* Match msg importance against queue limits: */
885
886 if (unlikely(queue_size >= queue_limit)) {
887 if (imp <= TIPC_CRITICAL_IMPORTANCE) {
Allan Stephensbebc55a2011-04-19 10:17:58 -0400888 link_schedule_port(l_ptr, msg_origport(msg), size);
889 buf_discard(buf);
890 return -ELINKCONG;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100891 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100892 buf_discard(buf);
893 if (imp > CONN_MANAGER) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700894 warn("Resetting link <%s>, send queue full", l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100895 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100896 }
897 return dsz;
898 }
899
900 /* Fragmentation needed ? */
901
902 if (size > max_packet)
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000903 return link_send_long_buf(l_ptr, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100904
905 /* Packet can be queued or sent: */
906
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900907 if (likely(!tipc_bearer_congested(l_ptr->b_ptr, l_ptr) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100908 !link_congested(l_ptr))) {
909 link_add_to_outqueue(l_ptr, buf, msg);
910
Per Liden4323add2006-01-18 00:38:21 +0100911 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr))) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100912 l_ptr->unacked_window = 0;
913 } else {
Per Liden4323add2006-01-18 00:38:21 +0100914 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100915 l_ptr->stats.bearer_congs++;
916 l_ptr->next_out = buf;
917 }
918 return dsz;
919 }
920 /* Congestion: can message be bundled ?: */
921
922 if ((msg_user(msg) != CHANGEOVER_PROTOCOL) &&
923 (msg_user(msg) != MSG_FRAGMENTER)) {
924
925 /* Try adding message to an existing bundle */
926
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900927 if (l_ptr->next_out &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100928 link_bundle_buf(l_ptr, l_ptr->last_out, buf)) {
Per Liden4323add2006-01-18 00:38:21 +0100929 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100930 return dsz;
931 }
932
933 /* Try creating a new bundle */
934
935 if (size <= max_packet * 2 / 3) {
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000936 struct sk_buff *bundler = tipc_buf_acquire(max_packet);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100937 struct tipc_msg bundler_hdr;
938
939 if (bundler) {
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000940 tipc_msg_init(&bundler_hdr, MSG_BUNDLER, OPEN_MSG,
Allan Stephens75715212008-06-04 17:37:34 -0700941 INT_H_SIZE, l_ptr->addr);
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -0300942 skb_copy_to_linear_data(bundler, &bundler_hdr,
943 INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100944 skb_trim(bundler, INT_H_SIZE);
945 link_bundle_buf(l_ptr, bundler, buf);
946 buf = bundler;
947 msg = buf_msg(buf);
948 l_ptr->stats.sent_bundles++;
949 }
950 }
951 }
952 if (!l_ptr->next_out)
953 l_ptr->next_out = buf;
954 link_add_to_outqueue(l_ptr, buf, msg);
Per Liden4323add2006-01-18 00:38:21 +0100955 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100956 return dsz;
957}
958
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900959/*
960 * tipc_link_send(): same as tipc_link_send_buf(), but the link to use has
Per Lidenb97bf3f2006-01-02 19:04:38 +0100961 * not been selected yet, and the the owner node is not locked
962 * Called by TIPC internal users, e.g. the name distributor
963 */
964
Per Liden4323add2006-01-18 00:38:21 +0100965int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100966{
967 struct link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -0700968 struct tipc_node *n_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100969 int res = -ELINKCONG;
970
Per Liden4323add2006-01-18 00:38:21 +0100971 read_lock_bh(&tipc_net_lock);
Allan Stephens51a8e4d2010-12-31 18:59:18 +0000972 n_ptr = tipc_node_find(dest);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100973 if (n_ptr) {
Per Liden4323add2006-01-18 00:38:21 +0100974 tipc_node_lock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100975 l_ptr = n_ptr->active_links[selector & 1];
Allan Stephensa0168922010-12-31 18:59:35 +0000976 if (l_ptr)
Per Liden4323add2006-01-18 00:38:21 +0100977 res = tipc_link_send_buf(l_ptr, buf);
Allan Stephensa0168922010-12-31 18:59:35 +0000978 else
Allan Stephensc33d53b2006-06-25 23:50:30 -0700979 buf_discard(buf);
Per Liden4323add2006-01-18 00:38:21 +0100980 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100981 } else {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100982 buf_discard(buf);
983 }
Per Liden4323add2006-01-18 00:38:21 +0100984 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100985 return res;
986}
987
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900988/*
989 * link_send_buf_fast: Entry for data messages where the
Per Lidenb97bf3f2006-01-02 19:04:38 +0100990 * destination link is known and the header is complete,
991 * inclusive total message length. Very time critical.
992 * Link is locked. Returns user data length.
993 */
994
Sam Ravnborg05790c62006-03-20 22:37:04 -0800995static int link_send_buf_fast(struct link *l_ptr, struct sk_buff *buf,
996 u32 *used_max_pkt)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100997{
998 struct tipc_msg *msg = buf_msg(buf);
999 int res = msg_data_sz(msg);
1000
1001 if (likely(!link_congested(l_ptr))) {
Allan Stephens15e979d2010-05-11 14:30:10 +00001002 if (likely(msg_size(msg) <= l_ptr->max_pkt)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001003 if (likely(list_empty(&l_ptr->b_ptr->cong_links))) {
1004 link_add_to_outqueue(l_ptr, buf, msg);
Per Liden4323add2006-01-18 00:38:21 +01001005 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf,
1006 &l_ptr->media_addr))) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001007 l_ptr->unacked_window = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001008 return res;
1009 }
Per Liden4323add2006-01-18 00:38:21 +01001010 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001011 l_ptr->stats.bearer_congs++;
1012 l_ptr->next_out = buf;
1013 return res;
1014 }
Allan Stephens0e659672010-12-31 18:59:32 +00001015 } else
Allan Stephens15e979d2010-05-11 14:30:10 +00001016 *used_max_pkt = l_ptr->max_pkt;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001017 }
Per Liden4323add2006-01-18 00:38:21 +01001018 return tipc_link_send_buf(l_ptr, buf); /* All other cases */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001019}
1020
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001021/*
1022 * tipc_send_buf_fast: Entry for data messages where the
Per Lidenb97bf3f2006-01-02 19:04:38 +01001023 * destination node is known and the header is complete,
1024 * inclusive total message length.
1025 * Returns user data length.
1026 */
1027int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode)
1028{
1029 struct link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -07001030 struct tipc_node *n_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001031 int res;
1032 u32 selector = msg_origport(buf_msg(buf)) & 1;
1033 u32 dummy;
1034
Per Liden4323add2006-01-18 00:38:21 +01001035 read_lock_bh(&tipc_net_lock);
Allan Stephens51a8e4d2010-12-31 18:59:18 +00001036 n_ptr = tipc_node_find(destnode);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001037 if (likely(n_ptr)) {
Per Liden4323add2006-01-18 00:38:21 +01001038 tipc_node_lock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001039 l_ptr = n_ptr->active_links[selector];
Per Lidenb97bf3f2006-01-02 19:04:38 +01001040 if (likely(l_ptr)) {
1041 res = link_send_buf_fast(l_ptr, buf, &dummy);
Per Liden4323add2006-01-18 00:38:21 +01001042 tipc_node_unlock(n_ptr);
1043 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001044 return res;
1045 }
Per Liden4323add2006-01-18 00:38:21 +01001046 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001047 }
Per Liden4323add2006-01-18 00:38:21 +01001048 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001049 res = msg_data_sz(buf_msg(buf));
1050 tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1051 return res;
1052}
1053
1054
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001055/*
1056 * tipc_link_send_sections_fast: Entry for messages where the
Per Lidenb97bf3f2006-01-02 19:04:38 +01001057 * destination processor is known and the header is complete,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001058 * except for total message length.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001059 * Returns user data length or errno.
1060 */
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001061int tipc_link_send_sections_fast(struct tipc_port *sender,
Per Liden4323add2006-01-18 00:38:21 +01001062 struct iovec const *msg_sect,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001063 const u32 num_sect,
Allan Stephens26896902011-04-21 10:42:07 -05001064 unsigned int total_len,
Per Liden4323add2006-01-18 00:38:21 +01001065 u32 destaddr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001066{
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001067 struct tipc_msg *hdr = &sender->phdr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001068 struct link *l_ptr;
1069 struct sk_buff *buf;
David S. Miller6c000552008-09-02 23:38:32 -07001070 struct tipc_node *node;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001071 int res;
1072 u32 selector = msg_origport(hdr) & 1;
1073
Per Lidenb97bf3f2006-01-02 19:04:38 +01001074again:
1075 /*
1076 * Try building message using port's max_pkt hint.
1077 * (Must not hold any locks while building message.)
1078 */
1079
Allan Stephens26896902011-04-21 10:42:07 -05001080 res = tipc_msg_build(hdr, msg_sect, num_sect, total_len,
1081 sender->max_pkt, !sender->user_port, &buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001082
Per Liden4323add2006-01-18 00:38:21 +01001083 read_lock_bh(&tipc_net_lock);
Allan Stephens51a8e4d2010-12-31 18:59:18 +00001084 node = tipc_node_find(destaddr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001085 if (likely(node)) {
Per Liden4323add2006-01-18 00:38:21 +01001086 tipc_node_lock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001087 l_ptr = node->active_links[selector];
1088 if (likely(l_ptr)) {
1089 if (likely(buf)) {
1090 res = link_send_buf_fast(l_ptr, buf,
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001091 &sender->max_pkt);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001092exit:
Per Liden4323add2006-01-18 00:38:21 +01001093 tipc_node_unlock(node);
1094 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001095 return res;
1096 }
1097
1098 /* Exit if build request was invalid */
1099
1100 if (unlikely(res < 0))
1101 goto exit;
1102
1103 /* Exit if link (or bearer) is congested */
1104
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001105 if (link_congested(l_ptr) ||
Per Lidenb97bf3f2006-01-02 19:04:38 +01001106 !list_empty(&l_ptr->b_ptr->cong_links)) {
1107 res = link_schedule_port(l_ptr,
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001108 sender->ref, res);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001109 goto exit;
1110 }
1111
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001112 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001113 * Message size exceeds max_pkt hint; update hint,
1114 * then re-try fast path or fragment the message
1115 */
1116
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001117 sender->max_pkt = l_ptr->max_pkt;
Per Liden4323add2006-01-18 00:38:21 +01001118 tipc_node_unlock(node);
1119 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001120
1121
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001122 if ((msg_hdr_sz(hdr) + res) <= sender->max_pkt)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001123 goto again;
1124
1125 return link_send_sections_long(sender, msg_sect,
Allan Stephens26896902011-04-21 10:42:07 -05001126 num_sect, total_len,
1127 destaddr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001128 }
Per Liden4323add2006-01-18 00:38:21 +01001129 tipc_node_unlock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001130 }
Per Liden4323add2006-01-18 00:38:21 +01001131 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001132
1133 /* Couldn't find a link to the destination node */
1134
1135 if (buf)
1136 return tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1137 if (res >= 0)
Per Liden4323add2006-01-18 00:38:21 +01001138 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
Allan Stephens26896902011-04-21 10:42:07 -05001139 total_len, TIPC_ERR_NO_NODE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001140 return res;
1141}
1142
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001143/*
1144 * link_send_sections_long(): Entry for long messages where the
Per Lidenb97bf3f2006-01-02 19:04:38 +01001145 * destination node is known and the header is complete,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001146 * inclusive total message length.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001147 * Link and bearer congestion status have been checked to be ok,
1148 * and are ignored if they change.
1149 *
1150 * Note that fragments do not use the full link MTU so that they won't have
1151 * to undergo refragmentation if link changeover causes them to be sent
1152 * over another link with an additional tunnel header added as prefix.
1153 * (Refragmentation will still occur if the other link has a smaller MTU.)
1154 *
1155 * Returns user data length or errno.
1156 */
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001157static int link_send_sections_long(struct tipc_port *sender,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001158 struct iovec const *msg_sect,
1159 u32 num_sect,
Allan Stephens26896902011-04-21 10:42:07 -05001160 unsigned int total_len,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001161 u32 destaddr)
1162{
1163 struct link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -07001164 struct tipc_node *node;
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001165 struct tipc_msg *hdr = &sender->phdr;
Allan Stephens26896902011-04-21 10:42:07 -05001166 u32 dsz = total_len;
Allan Stephens0e659672010-12-31 18:59:32 +00001167 u32 max_pkt, fragm_sz, rest;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001168 struct tipc_msg fragm_hdr;
Allan Stephens0e659672010-12-31 18:59:32 +00001169 struct sk_buff *buf, *buf_chain, *prev;
1170 u32 fragm_crs, fragm_rest, hsz, sect_rest;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001171 const unchar *sect_crs;
1172 int curr_sect;
1173 u32 fragm_no;
1174
1175again:
1176 fragm_no = 1;
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001177 max_pkt = sender->max_pkt - INT_H_SIZE;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001178 /* leave room for tunnel header in case of link changeover */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001179 fragm_sz = max_pkt - INT_H_SIZE;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001180 /* leave room for fragmentation header in each fragment */
1181 rest = dsz;
1182 fragm_crs = 0;
1183 fragm_rest = 0;
1184 sect_rest = 0;
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001185 sect_crs = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001186 curr_sect = -1;
1187
1188 /* Prepare reusable fragment header: */
1189
Allan Stephensc68ca7b2010-05-11 14:30:12 +00001190 tipc_msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
Allan Stephens75715212008-06-04 17:37:34 -07001191 INT_H_SIZE, msg_destnode(hdr));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001192 msg_set_size(&fragm_hdr, max_pkt);
1193 msg_set_fragm_no(&fragm_hdr, 1);
1194
1195 /* Prepare header of first fragment: */
1196
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001197 buf_chain = buf = tipc_buf_acquire(max_pkt);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001198 if (!buf)
1199 return -ENOMEM;
1200 buf->next = NULL;
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001201 skb_copy_to_linear_data(buf, &fragm_hdr, INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001202 hsz = msg_hdr_sz(hdr);
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001203 skb_copy_to_linear_data_offset(buf, INT_H_SIZE, hdr, hsz);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001204
1205 /* Chop up message: */
1206
1207 fragm_crs = INT_H_SIZE + hsz;
1208 fragm_rest = fragm_sz - hsz;
1209
1210 do { /* For all sections */
1211 u32 sz;
1212
1213 if (!sect_rest) {
1214 sect_rest = msg_sect[++curr_sect].iov_len;
1215 sect_crs = (const unchar *)msg_sect[curr_sect].iov_base;
1216 }
1217
1218 if (sect_rest < fragm_rest)
1219 sz = sect_rest;
1220 else
1221 sz = fragm_rest;
1222
1223 if (likely(!sender->user_port)) {
1224 if (copy_from_user(buf->data + fragm_crs, sect_crs, sz)) {
1225error:
1226 for (; buf_chain; buf_chain = buf) {
1227 buf = buf_chain->next;
1228 buf_discard(buf_chain);
1229 }
1230 return -EFAULT;
1231 }
1232 } else
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001233 skb_copy_to_linear_data_offset(buf, fragm_crs,
1234 sect_crs, sz);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001235 sect_crs += sz;
1236 sect_rest -= sz;
1237 fragm_crs += sz;
1238 fragm_rest -= sz;
1239 rest -= sz;
1240
1241 if (!fragm_rest && rest) {
1242
1243 /* Initiate new fragment: */
1244 if (rest <= fragm_sz) {
1245 fragm_sz = rest;
Allan Stephens0e659672010-12-31 18:59:32 +00001246 msg_set_type(&fragm_hdr, LAST_FRAGMENT);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001247 } else {
1248 msg_set_type(&fragm_hdr, FRAGMENT);
1249 }
1250 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
1251 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
1252 prev = buf;
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001253 buf = tipc_buf_acquire(fragm_sz + INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001254 if (!buf)
1255 goto error;
1256
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001257 buf->next = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001258 prev->next = buf;
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001259 skb_copy_to_linear_data(buf, &fragm_hdr, INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001260 fragm_crs = INT_H_SIZE;
1261 fragm_rest = fragm_sz;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001262 }
Allan Stephens0e659672010-12-31 18:59:32 +00001263 } while (rest > 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001264
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001265 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001266 * Now we have a buffer chain. Select a link and check
1267 * that packet size is still OK
1268 */
Allan Stephens51a8e4d2010-12-31 18:59:18 +00001269 node = tipc_node_find(destaddr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001270 if (likely(node)) {
Per Liden4323add2006-01-18 00:38:21 +01001271 tipc_node_lock(node);
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001272 l_ptr = node->active_links[sender->ref & 1];
Per Lidenb97bf3f2006-01-02 19:04:38 +01001273 if (!l_ptr) {
Per Liden4323add2006-01-18 00:38:21 +01001274 tipc_node_unlock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001275 goto reject;
1276 }
Allan Stephens15e979d2010-05-11 14:30:10 +00001277 if (l_ptr->max_pkt < max_pkt) {
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001278 sender->max_pkt = l_ptr->max_pkt;
Per Liden4323add2006-01-18 00:38:21 +01001279 tipc_node_unlock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001280 for (; buf_chain; buf_chain = buf) {
1281 buf = buf_chain->next;
1282 buf_discard(buf_chain);
1283 }
1284 goto again;
1285 }
1286 } else {
1287reject:
1288 for (; buf_chain; buf_chain = buf) {
1289 buf = buf_chain->next;
1290 buf_discard(buf_chain);
1291 }
Per Liden4323add2006-01-18 00:38:21 +01001292 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
Allan Stephens26896902011-04-21 10:42:07 -05001293 total_len, TIPC_ERR_NO_NODE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001294 }
1295
Allan Stephensdc63d912011-04-21 11:50:42 -04001296 /* Append chain of fragments to send queue & send them */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001297
Allan Stephense0f08592011-04-17 11:44:24 -04001298 l_ptr->long_msg_seq_no++;
Allan Stephensdc63d912011-04-21 11:50:42 -04001299 link_add_chain_to_outqueue(l_ptr, buf_chain, l_ptr->long_msg_seq_no);
1300 l_ptr->stats.sent_fragments += fragm_no;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001301 l_ptr->stats.sent_fragmented++;
Per Liden4323add2006-01-18 00:38:21 +01001302 tipc_link_push_queue(l_ptr);
1303 tipc_node_unlock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001304 return dsz;
1305}
1306
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001307/*
Per Liden4323add2006-01-18 00:38:21 +01001308 * tipc_link_push_packet: Push one unsent packet to the media
Per Lidenb97bf3f2006-01-02 19:04:38 +01001309 */
Per Liden4323add2006-01-18 00:38:21 +01001310u32 tipc_link_push_packet(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001311{
1312 struct sk_buff *buf = l_ptr->first_out;
1313 u32 r_q_size = l_ptr->retransm_queue_size;
1314 u32 r_q_head = l_ptr->retransm_queue_head;
1315
1316 /* Step to position where retransmission failed, if any, */
1317 /* consider that buffers may have been released in meantime */
1318
1319 if (r_q_size && buf) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001320 u32 last = lesser(mod(r_q_head + r_q_size),
Per Lidenb97bf3f2006-01-02 19:04:38 +01001321 link_last_sent(l_ptr));
1322 u32 first = msg_seqno(buf_msg(buf));
1323
1324 while (buf && less(first, r_q_head)) {
1325 first = mod(first + 1);
1326 buf = buf->next;
1327 }
1328 l_ptr->retransm_queue_head = r_q_head = first;
1329 l_ptr->retransm_queue_size = r_q_size = mod(last - first);
1330 }
1331
1332 /* Continue retransmission now, if there is anything: */
1333
Neil Hormanca509102010-03-15 07:58:45 +00001334 if (r_q_size && buf) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001335 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001336 msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
Per Liden4323add2006-01-18 00:38:21 +01001337 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001338 l_ptr->retransm_queue_head = mod(++r_q_head);
1339 l_ptr->retransm_queue_size = --r_q_size;
1340 l_ptr->stats.retransmitted++;
Allan Stephens0e35fd52008-07-14 22:44:01 -07001341 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001342 } else {
1343 l_ptr->stats.bearer_congs++;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001344 return PUSH_FAILED;
1345 }
1346 }
1347
1348 /* Send deferred protocol message, if any: */
1349
1350 buf = l_ptr->proto_msg_queue;
1351 if (buf) {
1352 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
Allan Stephens0e659672010-12-31 18:59:32 +00001353 msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
Per Liden4323add2006-01-18 00:38:21 +01001354 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001355 l_ptr->unacked_window = 0;
1356 buf_discard(buf);
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001357 l_ptr->proto_msg_queue = NULL;
Allan Stephens0e35fd52008-07-14 22:44:01 -07001358 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001359 } else {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001360 l_ptr->stats.bearer_congs++;
1361 return PUSH_FAILED;
1362 }
1363 }
1364
1365 /* Send one deferred data message, if send window not full: */
1366
1367 buf = l_ptr->next_out;
1368 if (buf) {
1369 struct tipc_msg *msg = buf_msg(buf);
1370 u32 next = msg_seqno(msg);
1371 u32 first = msg_seqno(buf_msg(l_ptr->first_out));
1372
1373 if (mod(next - first) < l_ptr->queue_limit[0]) {
1374 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001375 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Per Liden4323add2006-01-18 00:38:21 +01001376 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001377 if (msg_user(msg) == MSG_BUNDLER)
1378 msg_set_type(msg, CLOSED_MSG);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001379 l_ptr->next_out = buf->next;
Allan Stephens0e35fd52008-07-14 22:44:01 -07001380 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001381 } else {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001382 l_ptr->stats.bearer_congs++;
1383 return PUSH_FAILED;
1384 }
1385 }
1386 }
1387 return PUSH_FINISHED;
1388}
1389
1390/*
1391 * push_queue(): push out the unsent messages of a link where
1392 * congestion has abated. Node is locked
1393 */
Per Liden4323add2006-01-18 00:38:21 +01001394void tipc_link_push_queue(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001395{
1396 u32 res;
1397
Per Liden4323add2006-01-18 00:38:21 +01001398 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001399 return;
1400
1401 do {
Per Liden4323add2006-01-18 00:38:21 +01001402 res = tipc_link_push_packet(l_ptr);
Allan Stephens0e35fd52008-07-14 22:44:01 -07001403 } while (!res);
1404
Per Lidenb97bf3f2006-01-02 19:04:38 +01001405 if (res == PUSH_FAILED)
Per Liden4323add2006-01-18 00:38:21 +01001406 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001407}
1408
Allan Stephensd356eeb2006-06-25 23:40:01 -07001409static void link_reset_all(unsigned long addr)
1410{
David S. Miller6c000552008-09-02 23:38:32 -07001411 struct tipc_node *n_ptr;
Allan Stephensd356eeb2006-06-25 23:40:01 -07001412 char addr_string[16];
1413 u32 i;
1414
1415 read_lock_bh(&tipc_net_lock);
1416 n_ptr = tipc_node_find((u32)addr);
1417 if (!n_ptr) {
1418 read_unlock_bh(&tipc_net_lock);
1419 return; /* node no longer exists */
1420 }
1421
1422 tipc_node_lock(n_ptr);
1423
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001424 warn("Resetting all links to %s\n",
Allan Stephensc68ca7b2010-05-11 14:30:12 +00001425 tipc_addr_string_fill(addr_string, n_ptr->addr));
Allan Stephensd356eeb2006-06-25 23:40:01 -07001426
1427 for (i = 0; i < MAX_BEARERS; i++) {
1428 if (n_ptr->links[i]) {
Allan Stephens8d64a5b2010-12-31 18:59:27 +00001429 link_print(n_ptr->links[i], "Resetting link\n");
Allan Stephensd356eeb2006-06-25 23:40:01 -07001430 tipc_link_reset(n_ptr->links[i]);
1431 }
1432 }
1433
1434 tipc_node_unlock(n_ptr);
1435 read_unlock_bh(&tipc_net_lock);
1436}
1437
1438static void link_retransmit_failure(struct link *l_ptr, struct sk_buff *buf)
1439{
1440 struct tipc_msg *msg = buf_msg(buf);
1441
1442 warn("Retransmission failure on link <%s>\n", l_ptr->name);
Allan Stephensd356eeb2006-06-25 23:40:01 -07001443
1444 if (l_ptr->addr) {
1445
1446 /* Handle failure on standard link */
1447
Allan Stephens8d64a5b2010-12-31 18:59:27 +00001448 link_print(l_ptr, "Resetting link\n");
Allan Stephensd356eeb2006-06-25 23:40:01 -07001449 tipc_link_reset(l_ptr);
1450
1451 } else {
1452
1453 /* Handle failure on broadcast link */
1454
David S. Miller6c000552008-09-02 23:38:32 -07001455 struct tipc_node *n_ptr;
Allan Stephensd356eeb2006-06-25 23:40:01 -07001456 char addr_string[16];
1457
Allan Stephens8d64a5b2010-12-31 18:59:27 +00001458 info("Msg seq number: %u, ", msg_seqno(msg));
1459 info("Outstanding acks: %lu\n",
1460 (unsigned long) TIPC_SKB_CB(buf)->handle);
Jeff Garzik617dbea2006-10-03 16:25:34 -07001461
Allan Stephens01d83ed2011-01-18 13:53:16 -05001462 n_ptr = tipc_bclink_retransmit_to();
Allan Stephensd356eeb2006-06-25 23:40:01 -07001463 tipc_node_lock(n_ptr);
1464
Allan Stephensc68ca7b2010-05-11 14:30:12 +00001465 tipc_addr_string_fill(addr_string, n_ptr->addr);
Allan Stephens8d64a5b2010-12-31 18:59:27 +00001466 info("Multicast link info for %s\n", addr_string);
1467 info("Supported: %d, ", n_ptr->bclink.supported);
1468 info("Acked: %u\n", n_ptr->bclink.acked);
1469 info("Last in: %u, ", n_ptr->bclink.last_in);
1470 info("Gap after: %u, ", n_ptr->bclink.gap_after);
1471 info("Gap to: %u\n", n_ptr->bclink.gap_to);
1472 info("Nack sync: %u\n\n", n_ptr->bclink.nack_sync);
Allan Stephensd356eeb2006-06-25 23:40:01 -07001473
1474 tipc_k_signal((Handler)link_reset_all, (unsigned long)n_ptr->addr);
1475
1476 tipc_node_unlock(n_ptr);
1477
1478 l_ptr->stale_count = 0;
1479 }
1480}
1481
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001482void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *buf,
Per Liden4323add2006-01-18 00:38:21 +01001483 u32 retransmits)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001484{
1485 struct tipc_msg *msg;
1486
Allan Stephensd356eeb2006-06-25 23:40:01 -07001487 if (!buf)
1488 return;
1489
1490 msg = buf_msg(buf);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001491
Allan Stephensd356eeb2006-06-25 23:40:01 -07001492 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
Neil Hormanca509102010-03-15 07:58:45 +00001493 if (l_ptr->retransm_queue_size == 0) {
Allan Stephensd356eeb2006-06-25 23:40:01 -07001494 l_ptr->retransm_queue_head = msg_seqno(msg);
1495 l_ptr->retransm_queue_size = retransmits;
Allan Stephensd356eeb2006-06-25 23:40:01 -07001496 } else {
Neil Hormanca509102010-03-15 07:58:45 +00001497 err("Unexpected retransmit on link %s (qsize=%d)\n",
1498 l_ptr->name, l_ptr->retransm_queue_size);
Allan Stephensd356eeb2006-06-25 23:40:01 -07001499 }
Neil Hormanca509102010-03-15 07:58:45 +00001500 return;
Allan Stephensd356eeb2006-06-25 23:40:01 -07001501 } else {
1502 /* Detect repeated retransmit failures on uncongested bearer */
1503
1504 if (l_ptr->last_retransmitted == msg_seqno(msg)) {
1505 if (++l_ptr->stale_count > 100) {
1506 link_retransmit_failure(l_ptr, buf);
1507 return;
1508 }
1509 } else {
1510 l_ptr->last_retransmitted = msg_seqno(msg);
1511 l_ptr->stale_count = 1;
1512 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001513 }
Allan Stephensd356eeb2006-06-25 23:40:01 -07001514
Neil Hormanca509102010-03-15 07:58:45 +00001515 while (retransmits && (buf != l_ptr->next_out) && buf) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001516 msg = buf_msg(buf);
1517 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001518 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Per Liden4323add2006-01-18 00:38:21 +01001519 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001520 buf = buf->next;
1521 retransmits--;
1522 l_ptr->stats.retransmitted++;
1523 } else {
Per Liden4323add2006-01-18 00:38:21 +01001524 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001525 l_ptr->stats.bearer_congs++;
1526 l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
1527 l_ptr->retransm_queue_size = retransmits;
1528 return;
1529 }
1530 }
Allan Stephensd356eeb2006-06-25 23:40:01 -07001531
Per Lidenb97bf3f2006-01-02 19:04:38 +01001532 l_ptr->retransm_queue_head = l_ptr->retransm_queue_size = 0;
1533}
1534
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001535/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001536 * link_insert_deferred_queue - insert deferred messages back into receive chain
1537 */
1538
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001539static struct sk_buff *link_insert_deferred_queue(struct link *l_ptr,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001540 struct sk_buff *buf)
1541{
1542 u32 seq_no;
1543
1544 if (l_ptr->oldest_deferred_in == NULL)
1545 return buf;
1546
1547 seq_no = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1548 if (seq_no == mod(l_ptr->next_in_no)) {
1549 l_ptr->newest_deferred_in->next = buf;
1550 buf = l_ptr->oldest_deferred_in;
1551 l_ptr->oldest_deferred_in = NULL;
1552 l_ptr->deferred_inqueue_sz = 0;
1553 }
1554 return buf;
1555}
1556
Allan Stephens85035562008-04-15 19:04:54 -07001557/**
1558 * link_recv_buf_validate - validate basic format of received message
1559 *
1560 * This routine ensures a TIPC message has an acceptable header, and at least
1561 * as much data as the header indicates it should. The routine also ensures
1562 * that the entire message header is stored in the main fragment of the message
1563 * buffer, to simplify future access to message header fields.
1564 *
1565 * Note: Having extra info present in the message header or data areas is OK.
1566 * TIPC will ignore the excess, under the assumption that it is optional info
1567 * introduced by a later release of the protocol.
1568 */
1569
1570static int link_recv_buf_validate(struct sk_buff *buf)
1571{
1572 static u32 min_data_hdr_size[8] = {
Allan Stephens741d9eb2011-05-31 15:03:18 -04001573 SHORT_H_SIZE, MCAST_H_SIZE, NAMED_H_SIZE, BASIC_H_SIZE,
Allan Stephens85035562008-04-15 19:04:54 -07001574 MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE
1575 };
1576
1577 struct tipc_msg *msg;
1578 u32 tipc_hdr[2];
1579 u32 size;
1580 u32 hdr_size;
1581 u32 min_hdr_size;
1582
1583 if (unlikely(buf->len < MIN_H_SIZE))
1584 return 0;
1585
1586 msg = skb_header_pointer(buf, 0, sizeof(tipc_hdr), tipc_hdr);
1587 if (msg == NULL)
1588 return 0;
1589
1590 if (unlikely(msg_version(msg) != TIPC_VERSION))
1591 return 0;
1592
1593 size = msg_size(msg);
1594 hdr_size = msg_hdr_sz(msg);
1595 min_hdr_size = msg_isdata(msg) ?
1596 min_data_hdr_size[msg_type(msg)] : INT_H_SIZE;
1597
1598 if (unlikely((hdr_size < min_hdr_size) ||
1599 (size < hdr_size) ||
1600 (buf->len < size) ||
1601 (size - hdr_size > TIPC_MAX_USER_MSG_SIZE)))
1602 return 0;
1603
1604 return pskb_may_pull(buf, hdr_size);
1605}
1606
Allan Stephensb02b69c2010-08-17 11:00:07 +00001607/**
1608 * tipc_recv_msg - process TIPC messages arriving from off-node
1609 * @head: pointer to message buffer chain
1610 * @tb_ptr: pointer to bearer message arrived on
1611 *
1612 * Invoked with no locks held. Bearer pointer must point to a valid bearer
1613 * structure (i.e. cannot be NULL), but bearer can be inactive.
1614 */
1615
Allan Stephens2d627b92011-01-07 13:00:11 -05001616void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001617{
Per Liden4323add2006-01-18 00:38:21 +01001618 read_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001619 while (head) {
David S. Miller6c000552008-09-02 23:38:32 -07001620 struct tipc_node *n_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001621 struct link *l_ptr;
1622 struct sk_buff *crs;
1623 struct sk_buff *buf = head;
Allan Stephens85035562008-04-15 19:04:54 -07001624 struct tipc_msg *msg;
1625 u32 seq_no;
1626 u32 ackd;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001627 u32 released = 0;
1628 int type;
1629
Per Lidenb97bf3f2006-01-02 19:04:38 +01001630 head = head->next;
Allan Stephens85035562008-04-15 19:04:54 -07001631
Allan Stephensb02b69c2010-08-17 11:00:07 +00001632 /* Ensure bearer is still enabled */
1633
1634 if (unlikely(!b_ptr->active))
1635 goto cont;
1636
Allan Stephens85035562008-04-15 19:04:54 -07001637 /* Ensure message is well-formed */
1638
1639 if (unlikely(!link_recv_buf_validate(buf)))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001640 goto cont;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001641
Allan Stephensfe13dda2008-04-15 19:03:23 -07001642 /* Ensure message data is a single contiguous unit */
1643
Allan Stephensa0168922010-12-31 18:59:35 +00001644 if (unlikely(buf_linearize(buf)))
Allan Stephensfe13dda2008-04-15 19:03:23 -07001645 goto cont;
Allan Stephensfe13dda2008-04-15 19:03:23 -07001646
Allan Stephens85035562008-04-15 19:04:54 -07001647 /* Handle arrival of a non-unicast link message */
1648
1649 msg = buf_msg(buf);
1650
Per Lidenb97bf3f2006-01-02 19:04:38 +01001651 if (unlikely(msg_non_seq(msg))) {
Allan Stephens1265a022008-06-04 17:32:35 -07001652 if (msg_user(msg) == LINK_CONFIG)
1653 tipc_disc_recv_msg(buf, b_ptr);
1654 else
1655 tipc_bclink_recv_pkt(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001656 continue;
1657 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001658
Allan Stephensed33a9c2011-04-05 15:15:04 -04001659 /* Discard unicast link messages destined for another node */
1660
Allan Stephens26008242006-06-25 23:39:31 -07001661 if (unlikely(!msg_short(msg) &&
1662 (msg_destnode(msg) != tipc_own_addr)))
1663 goto cont;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001664
Allan Stephens5a68d5ee2010-08-17 11:00:16 +00001665 /* Locate neighboring node that sent message */
Allan Stephens85035562008-04-15 19:04:54 -07001666
Per Liden4323add2006-01-18 00:38:21 +01001667 n_ptr = tipc_node_find(msg_prevnode(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001668 if (unlikely(!n_ptr))
1669 goto cont;
Per Liden4323add2006-01-18 00:38:21 +01001670 tipc_node_lock(n_ptr);
Allan Stephens85035562008-04-15 19:04:54 -07001671
Allan Stephens5a68d5ee2010-08-17 11:00:16 +00001672 /* Don't talk to neighbor during cleanup after last session */
1673
1674 if (n_ptr->cleanup_required) {
1675 tipc_node_unlock(n_ptr);
1676 goto cont;
1677 }
1678
1679 /* Locate unicast link endpoint that should handle message */
1680
Per Lidenb97bf3f2006-01-02 19:04:38 +01001681 l_ptr = n_ptr->links[b_ptr->identity];
1682 if (unlikely(!l_ptr)) {
Per Liden4323add2006-01-18 00:38:21 +01001683 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001684 goto cont;
1685 }
Allan Stephens85035562008-04-15 19:04:54 -07001686
1687 /* Validate message sequence number info */
1688
1689 seq_no = msg_seqno(msg);
1690 ackd = msg_ack(msg);
1691
1692 /* Release acked messages */
1693
Per Lidenb97bf3f2006-01-02 19:04:38 +01001694 if (less(n_ptr->bclink.acked, msg_bcast_ack(msg))) {
Per Liden4323add2006-01-18 00:38:21 +01001695 if (tipc_node_is_up(n_ptr) && n_ptr->bclink.supported)
1696 tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001697 }
1698
1699 crs = l_ptr->first_out;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001700 while ((crs != l_ptr->next_out) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01001701 less_eq(msg_seqno(buf_msg(crs)), ackd)) {
1702 struct sk_buff *next = crs->next;
1703
1704 buf_discard(crs);
1705 crs = next;
1706 released++;
1707 }
1708 if (released) {
1709 l_ptr->first_out = crs;
1710 l_ptr->out_queue_size -= released;
1711 }
Allan Stephens85035562008-04-15 19:04:54 -07001712
1713 /* Try sending any messages link endpoint has pending */
1714
Per Lidenb97bf3f2006-01-02 19:04:38 +01001715 if (unlikely(l_ptr->next_out))
Per Liden4323add2006-01-18 00:38:21 +01001716 tipc_link_push_queue(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001717 if (unlikely(!list_empty(&l_ptr->waiting_ports)))
Per Liden4323add2006-01-18 00:38:21 +01001718 tipc_link_wakeup_ports(l_ptr, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001719 if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
1720 l_ptr->stats.sent_acks++;
Per Liden4323add2006-01-18 00:38:21 +01001721 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001722 }
1723
Allan Stephens85035562008-04-15 19:04:54 -07001724 /* Now (finally!) process the incoming message */
1725
Per Lidenb97bf3f2006-01-02 19:04:38 +01001726protocol_check:
1727 if (likely(link_working_working(l_ptr))) {
1728 if (likely(seq_no == mod(l_ptr->next_in_no))) {
1729 l_ptr->next_in_no++;
1730 if (unlikely(l_ptr->oldest_deferred_in))
1731 head = link_insert_deferred_queue(l_ptr,
1732 head);
1733 if (likely(msg_is_dest(msg, tipc_own_addr))) {
1734deliver:
1735 if (likely(msg_isdata(msg))) {
Per Liden4323add2006-01-18 00:38:21 +01001736 tipc_node_unlock(n_ptr);
1737 tipc_port_recv_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001738 continue;
1739 }
1740 switch (msg_user(msg)) {
1741 case MSG_BUNDLER:
1742 l_ptr->stats.recv_bundles++;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001743 l_ptr->stats.recv_bundled +=
Per Lidenb97bf3f2006-01-02 19:04:38 +01001744 msg_msgcnt(msg);
Per Liden4323add2006-01-18 00:38:21 +01001745 tipc_node_unlock(n_ptr);
1746 tipc_link_recv_bundle(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001747 continue;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001748 case NAME_DISTRIBUTOR:
Per Liden4323add2006-01-18 00:38:21 +01001749 tipc_node_unlock(n_ptr);
1750 tipc_named_recv(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001751 continue;
1752 case CONN_MANAGER:
Per Liden4323add2006-01-18 00:38:21 +01001753 tipc_node_unlock(n_ptr);
1754 tipc_port_recv_proto_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001755 continue;
1756 case MSG_FRAGMENTER:
1757 l_ptr->stats.recv_fragments++;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001758 if (tipc_link_recv_fragment(&l_ptr->defragm_buf,
Per Liden4323add2006-01-18 00:38:21 +01001759 &buf, &msg)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001760 l_ptr->stats.recv_fragmented++;
1761 goto deliver;
1762 }
1763 break;
1764 case CHANGEOVER_PROTOCOL:
1765 type = msg_type(msg);
Per Liden4323add2006-01-18 00:38:21 +01001766 if (link_recv_changeover_msg(&l_ptr, &buf)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001767 msg = buf_msg(buf);
1768 seq_no = msg_seqno(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001769 if (type == ORIGINAL_MSG)
1770 goto deliver;
1771 goto protocol_check;
1772 }
1773 break;
Allan Stephens7945c1f2011-03-11 13:09:28 -05001774 default:
1775 buf_discard(buf);
1776 buf = NULL;
1777 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001778 }
1779 }
Per Liden4323add2006-01-18 00:38:21 +01001780 tipc_node_unlock(n_ptr);
1781 tipc_net_route_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001782 continue;
1783 }
1784 link_handle_out_of_seq_msg(l_ptr, buf);
1785 head = link_insert_deferred_queue(l_ptr, head);
Per Liden4323add2006-01-18 00:38:21 +01001786 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001787 continue;
1788 }
1789
1790 if (msg_user(msg) == LINK_PROTOCOL) {
1791 link_recv_proto_msg(l_ptr, buf);
1792 head = link_insert_deferred_queue(l_ptr, head);
Per Liden4323add2006-01-18 00:38:21 +01001793 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001794 continue;
1795 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001796 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1797
1798 if (link_working_working(l_ptr)) {
1799 /* Re-insert in front of queue */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001800 buf->next = head;
1801 head = buf;
Per Liden4323add2006-01-18 00:38:21 +01001802 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001803 continue;
1804 }
Per Liden4323add2006-01-18 00:38:21 +01001805 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001806cont:
1807 buf_discard(buf);
1808 }
Per Liden4323add2006-01-18 00:38:21 +01001809 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001810}
1811
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001812/*
1813 * link_defer_buf(): Sort a received out-of-sequence packet
Per Lidenb97bf3f2006-01-02 19:04:38 +01001814 * into the deferred reception queue.
1815 * Returns the increase of the queue length,i.e. 0 or 1
1816 */
1817
Per Liden4323add2006-01-18 00:38:21 +01001818u32 tipc_link_defer_pkt(struct sk_buff **head,
1819 struct sk_buff **tail,
1820 struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001821{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001822 struct sk_buff *prev = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001823 struct sk_buff *crs = *head;
1824 u32 seq_no = msg_seqno(buf_msg(buf));
1825
1826 buf->next = NULL;
1827
1828 /* Empty queue ? */
1829 if (*head == NULL) {
1830 *head = *tail = buf;
1831 return 1;
1832 }
1833
1834 /* Last ? */
1835 if (less(msg_seqno(buf_msg(*tail)), seq_no)) {
1836 (*tail)->next = buf;
1837 *tail = buf;
1838 return 1;
1839 }
1840
1841 /* Scan through queue and sort it in */
1842 do {
1843 struct tipc_msg *msg = buf_msg(crs);
1844
1845 if (less(seq_no, msg_seqno(msg))) {
1846 buf->next = crs;
1847 if (prev)
1848 prev->next = buf;
1849 else
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001850 *head = buf;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001851 return 1;
1852 }
Allan Stephensa0168922010-12-31 18:59:35 +00001853 if (seq_no == msg_seqno(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001854 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001855 prev = crs;
1856 crs = crs->next;
Allan Stephens0e659672010-12-31 18:59:32 +00001857 } while (crs);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001858
1859 /* Message is a duplicate of an existing message */
1860
1861 buf_discard(buf);
1862 return 0;
1863}
1864
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001865/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001866 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
1867 */
1868
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001869static void link_handle_out_of_seq_msg(struct link *l_ptr,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001870 struct sk_buff *buf)
1871{
1872 u32 seq_no = msg_seqno(buf_msg(buf));
1873
1874 if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
1875 link_recv_proto_msg(l_ptr, buf);
1876 return;
1877 }
1878
Per Lidenb97bf3f2006-01-02 19:04:38 +01001879 /* Record OOS packet arrival (force mismatch on next timeout) */
1880
1881 l_ptr->checkpoint--;
1882
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001883 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001884 * Discard packet if a duplicate; otherwise add it to deferred queue
1885 * and notify peer of gap as per protocol specification
1886 */
1887
1888 if (less(seq_no, mod(l_ptr->next_in_no))) {
1889 l_ptr->stats.duplicates++;
1890 buf_discard(buf);
1891 return;
1892 }
1893
Per Liden4323add2006-01-18 00:38:21 +01001894 if (tipc_link_defer_pkt(&l_ptr->oldest_deferred_in,
1895 &l_ptr->newest_deferred_in, buf)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001896 l_ptr->deferred_inqueue_sz++;
1897 l_ptr->stats.deferred_recv++;
1898 if ((l_ptr->deferred_inqueue_sz % 16) == 1)
Per Liden4323add2006-01-18 00:38:21 +01001899 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001900 } else
1901 l_ptr->stats.duplicates++;
1902}
1903
1904/*
1905 * Send protocol message to the other endpoint.
1906 */
Per Liden4323add2006-01-18 00:38:21 +01001907void tipc_link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int probe_msg,
1908 u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001909{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001910 struct sk_buff *buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001911 struct tipc_msg *msg = l_ptr->pmsg;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001912 u32 msg_size = sizeof(l_ptr->proto_msg);
Allan Stephens75f0aa42011-02-28 15:30:20 -05001913 int r_flag;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001914
1915 if (link_blocked(l_ptr))
1916 return;
1917 msg_set_type(msg, msg_typ);
1918 msg_set_net_plane(msg, l_ptr->b_ptr->net_plane);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001919 msg_set_bcast_ack(msg, mod(l_ptr->owner->bclink.last_in));
Per Liden4323add2006-01-18 00:38:21 +01001920 msg_set_last_bcast(msg, tipc_bclink_get_last_sent());
Per Lidenb97bf3f2006-01-02 19:04:38 +01001921
1922 if (msg_typ == STATE_MSG) {
1923 u32 next_sent = mod(l_ptr->next_out_no);
1924
Per Liden4323add2006-01-18 00:38:21 +01001925 if (!tipc_link_is_up(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001926 return;
1927 if (l_ptr->next_out)
1928 next_sent = msg_seqno(buf_msg(l_ptr->next_out));
1929 msg_set_next_sent(msg, next_sent);
1930 if (l_ptr->oldest_deferred_in) {
1931 u32 rec = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1932 gap = mod(rec - mod(l_ptr->next_in_no));
1933 }
1934 msg_set_seq_gap(msg, gap);
1935 if (gap)
1936 l_ptr->stats.sent_nacks++;
1937 msg_set_link_tolerance(msg, tolerance);
1938 msg_set_linkprio(msg, priority);
1939 msg_set_max_pkt(msg, ack_mtu);
1940 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1941 msg_set_probe(msg, probe_msg != 0);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001942 if (probe_msg) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001943 u32 mtu = l_ptr->max_pkt;
1944
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001945 if ((mtu < l_ptr->max_pkt_target) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01001946 link_working_working(l_ptr) &&
1947 l_ptr->fsm_msg_cnt) {
1948 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001949 if (l_ptr->max_pkt_probes == 10) {
1950 l_ptr->max_pkt_target = (msg_size - 4);
1951 l_ptr->max_pkt_probes = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001952 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001953 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001954 l_ptr->max_pkt_probes++;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001955 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001956
1957 l_ptr->stats.sent_probes++;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001958 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001959 l_ptr->stats.sent_states++;
1960 } else { /* RESET_MSG or ACTIVATE_MSG */
1961 msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1));
1962 msg_set_seq_gap(msg, 0);
1963 msg_set_next_sent(msg, 1);
Allan Stephensf23d9bf2011-01-18 15:15:34 -05001964 msg_set_probe(msg, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001965 msg_set_link_tolerance(msg, l_ptr->tolerance);
1966 msg_set_linkprio(msg, l_ptr->priority);
1967 msg_set_max_pkt(msg, l_ptr->max_pkt_target);
1968 }
1969
Allan Stephens75f0aa42011-02-28 15:30:20 -05001970 r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr));
1971 msg_set_redundant_link(msg, r_flag);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001972 msg_set_linkprio(msg, l_ptr->priority);
1973
1974 /* Ensure sequence number will not fit : */
1975
1976 msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
1977
1978 /* Congestion? */
1979
Per Liden4323add2006-01-18 00:38:21 +01001980 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001981 if (!l_ptr->proto_msg_queue) {
1982 l_ptr->proto_msg_queue =
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001983 tipc_buf_acquire(sizeof(l_ptr->proto_msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001984 }
1985 buf = l_ptr->proto_msg_queue;
1986 if (!buf)
1987 return;
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001988 skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001989 return;
1990 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001991
1992 /* Message can be sent */
1993
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001994 buf = tipc_buf_acquire(msg_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001995 if (!buf)
1996 return;
1997
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001998 skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001999 msg_set_size(buf_msg(buf), msg_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002000
Per Liden4323add2006-01-18 00:38:21 +01002001 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002002 l_ptr->unacked_window = 0;
2003 buf_discard(buf);
2004 return;
2005 }
2006
2007 /* New congestion */
Per Liden4323add2006-01-18 00:38:21 +01002008 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002009 l_ptr->proto_msg_queue = buf;
2010 l_ptr->stats.bearer_congs++;
2011}
2012
2013/*
2014 * Receive protocol message :
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002015 * Note that network plane id propagates through the network, and may
2016 * change at any time. The node with lowest address rules
Per Lidenb97bf3f2006-01-02 19:04:38 +01002017 */
2018
2019static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf)
2020{
2021 u32 rec_gap = 0;
2022 u32 max_pkt_info;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002023 u32 max_pkt_ack;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002024 u32 msg_tol;
2025 struct tipc_msg *msg = buf_msg(buf);
2026
Per Lidenb97bf3f2006-01-02 19:04:38 +01002027 if (link_blocked(l_ptr))
2028 goto exit;
2029
2030 /* record unnumbered packet arrival (force mismatch on next timeout) */
2031
2032 l_ptr->checkpoint--;
2033
2034 if (l_ptr->b_ptr->net_plane != msg_net_plane(msg))
2035 if (tipc_own_addr > msg_prevnode(msg))
2036 l_ptr->b_ptr->net_plane = msg_net_plane(msg);
2037
2038 l_ptr->owner->permit_changeover = msg_redundant_link(msg);
2039
2040 switch (msg_type(msg)) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002041
Per Lidenb97bf3f2006-01-02 19:04:38 +01002042 case RESET_MSG:
Allan Stephensa686e682008-06-04 17:29:39 -07002043 if (!link_working_unknown(l_ptr) &&
2044 (l_ptr->peer_session != INVALID_SESSION)) {
Allan Stephens641c2182011-04-07 09:54:43 -04002045 if (less_eq(msg_session(msg), l_ptr->peer_session))
2046 break; /* duplicate or old reset: ignore */
Per Lidenb97bf3f2006-01-02 19:04:38 +01002047 }
2048 /* fall thru' */
2049 case ACTIVATE_MSG:
2050 /* Update link settings according other endpoint's values */
2051
2052 strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
2053
Allan Stephens2db99832010-12-31 18:59:33 +00002054 msg_tol = msg_link_tolerance(msg);
2055 if (msg_tol > l_ptr->tolerance)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002056 link_set_supervision_props(l_ptr, msg_tol);
2057
2058 if (msg_linkprio(msg) > l_ptr->priority)
2059 l_ptr->priority = msg_linkprio(msg);
2060
2061 max_pkt_info = msg_max_pkt(msg);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002062 if (max_pkt_info) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002063 if (max_pkt_info < l_ptr->max_pkt_target)
2064 l_ptr->max_pkt_target = max_pkt_info;
2065 if (l_ptr->max_pkt > l_ptr->max_pkt_target)
2066 l_ptr->max_pkt = l_ptr->max_pkt_target;
2067 } else {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002068 l_ptr->max_pkt = l_ptr->max_pkt_target;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002069 }
2070 l_ptr->owner->bclink.supported = (max_pkt_info != 0);
2071
2072 link_state_event(l_ptr, msg_type(msg));
2073
2074 l_ptr->peer_session = msg_session(msg);
2075 l_ptr->peer_bearer_id = msg_bearer_id(msg);
2076
2077 /* Synchronize broadcast sequence numbers */
Paul Gortmaker8f19afb2011-02-28 11:36:21 -04002078 if (!tipc_node_redundant_links(l_ptr->owner))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002079 l_ptr->owner->bclink.last_in = mod(msg_last_bcast(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002080 break;
2081 case STATE_MSG:
2082
Allan Stephens2db99832010-12-31 18:59:33 +00002083 msg_tol = msg_link_tolerance(msg);
2084 if (msg_tol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002085 link_set_supervision_props(l_ptr, msg_tol);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002086
2087 if (msg_linkprio(msg) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01002088 (msg_linkprio(msg) != l_ptr->priority)) {
Allan Stephensa10bd922006-06-25 23:52:17 -07002089 warn("Resetting link <%s>, priority change %u->%u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +01002090 l_ptr->name, l_ptr->priority, msg_linkprio(msg));
2091 l_ptr->priority = msg_linkprio(msg);
Per Liden4323add2006-01-18 00:38:21 +01002092 tipc_link_reset(l_ptr); /* Enforce change to take effect */
Per Lidenb97bf3f2006-01-02 19:04:38 +01002093 break;
2094 }
2095 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
2096 l_ptr->stats.recv_states++;
2097 if (link_reset_unknown(l_ptr))
2098 break;
2099
2100 if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002101 rec_gap = mod(msg_next_sent(msg) -
Per Lidenb97bf3f2006-01-02 19:04:38 +01002102 mod(l_ptr->next_in_no));
2103 }
2104
2105 max_pkt_ack = msg_max_pkt(msg);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002106 if (max_pkt_ack > l_ptr->max_pkt) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002107 l_ptr->max_pkt = max_pkt_ack;
2108 l_ptr->max_pkt_probes = 0;
2109 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002110
2111 max_pkt_ack = 0;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002112 if (msg_probe(msg)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002113 l_ptr->stats.recv_probes++;
Allan Stephensa0168922010-12-31 18:59:35 +00002114 if (msg_size(msg) > sizeof(l_ptr->proto_msg))
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002115 max_pkt_ack = msg_size(msg);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002116 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002117
2118 /* Protocol message before retransmits, reduce loss risk */
2119
Per Liden4323add2006-01-18 00:38:21 +01002120 tipc_bclink_check_gap(l_ptr->owner, msg_last_bcast(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002121
2122 if (rec_gap || (msg_probe(msg))) {
Per Liden4323add2006-01-18 00:38:21 +01002123 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2124 0, rec_gap, 0, 0, max_pkt_ack);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002125 }
2126 if (msg_seq_gap(msg)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002127 l_ptr->stats.recv_nacks++;
Per Liden4323add2006-01-18 00:38:21 +01002128 tipc_link_retransmit(l_ptr, l_ptr->first_out,
2129 msg_seq_gap(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002130 }
2131 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002132 }
2133exit:
2134 buf_discard(buf);
2135}
2136
2137
2138/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002139 * tipc_link_tunnel(): Send one message via a link belonging to
Per Lidenb97bf3f2006-01-02 19:04:38 +01002140 * another bearer. Owner node is locked.
2141 */
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002142static void tipc_link_tunnel(struct link *l_ptr,
2143 struct tipc_msg *tunnel_hdr,
2144 struct tipc_msg *msg,
2145 u32 selector)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002146{
2147 struct link *tunnel;
2148 struct sk_buff *buf;
2149 u32 length = msg_size(msg);
2150
2151 tunnel = l_ptr->owner->active_links[selector & 1];
Allan Stephens5392d642006-06-25 23:52:50 -07002152 if (!tipc_link_is_up(tunnel)) {
2153 warn("Link changeover error, "
2154 "tunnel link no longer available\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002155 return;
Allan Stephens5392d642006-06-25 23:52:50 -07002156 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002157 msg_set_size(tunnel_hdr, length + INT_H_SIZE);
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002158 buf = tipc_buf_acquire(length + INT_H_SIZE);
Allan Stephens5392d642006-06-25 23:52:50 -07002159 if (!buf) {
2160 warn("Link changeover error, "
2161 "unable to send tunnel msg\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002162 return;
Allan Stephens5392d642006-06-25 23:52:50 -07002163 }
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002164 skb_copy_to_linear_data(buf, tunnel_hdr, INT_H_SIZE);
2165 skb_copy_to_linear_data_offset(buf, INT_H_SIZE, msg, length);
Per Liden4323add2006-01-18 00:38:21 +01002166 tipc_link_send_buf(tunnel, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002167}
2168
2169
2170
2171/*
2172 * changeover(): Send whole message queue via the remaining link
2173 * Owner node is locked.
2174 */
2175
Per Liden4323add2006-01-18 00:38:21 +01002176void tipc_link_changeover(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002177{
2178 u32 msgcount = l_ptr->out_queue_size;
2179 struct sk_buff *crs = l_ptr->first_out;
2180 struct link *tunnel = l_ptr->owner->active_links[0];
Per Lidenb97bf3f2006-01-02 19:04:38 +01002181 struct tipc_msg tunnel_hdr;
Allan Stephens5392d642006-06-25 23:52:50 -07002182 int split_bundles;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002183
2184 if (!tunnel)
2185 return;
2186
Allan Stephens5392d642006-06-25 23:52:50 -07002187 if (!l_ptr->owner->permit_changeover) {
2188 warn("Link changeover error, "
2189 "peer did not permit changeover\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002190 return;
Allan Stephens5392d642006-06-25 23:52:50 -07002191 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002192
Allan Stephensc68ca7b2010-05-11 14:30:12 +00002193 tipc_msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
Allan Stephens75715212008-06-04 17:37:34 -07002194 ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002195 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2196 msg_set_msgcnt(&tunnel_hdr, msgcount);
Allan Stephensf1310722006-06-25 23:51:37 -07002197
Per Lidenb97bf3f2006-01-02 19:04:38 +01002198 if (!l_ptr->first_out) {
2199 struct sk_buff *buf;
2200
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002201 buf = tipc_buf_acquire(INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002202 if (buf) {
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002203 skb_copy_to_linear_data(buf, &tunnel_hdr, INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002204 msg_set_size(&tunnel_hdr, INT_H_SIZE);
Per Liden4323add2006-01-18 00:38:21 +01002205 tipc_link_send_buf(tunnel, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002206 } else {
Allan Stephensa10bd922006-06-25 23:52:17 -07002207 warn("Link changeover error, "
2208 "unable to send changeover msg\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002209 }
2210 return;
2211 }
Allan Stephensf1310722006-06-25 23:51:37 -07002212
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002213 split_bundles = (l_ptr->owner->active_links[0] !=
Allan Stephens5392d642006-06-25 23:52:50 -07002214 l_ptr->owner->active_links[1]);
2215
Per Lidenb97bf3f2006-01-02 19:04:38 +01002216 while (crs) {
2217 struct tipc_msg *msg = buf_msg(crs);
2218
2219 if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002220 struct tipc_msg *m = msg_get_wrapped(msg);
Allan Stephens0e659672010-12-31 18:59:32 +00002221 unchar *pos = (unchar *)m;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002222
Florian Westphald788d802007-08-02 19:28:06 -07002223 msgcount = msg_msgcnt(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002224 while (msgcount--) {
Allan Stephens0e659672010-12-31 18:59:32 +00002225 msg_set_seqno(m, msg_seqno(msg));
Per Liden4323add2006-01-18 00:38:21 +01002226 tipc_link_tunnel(l_ptr, &tunnel_hdr, m,
2227 msg_link_selector(m));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002228 pos += align(msg_size(m));
2229 m = (struct tipc_msg *)pos;
2230 }
2231 } else {
Per Liden4323add2006-01-18 00:38:21 +01002232 tipc_link_tunnel(l_ptr, &tunnel_hdr, msg,
2233 msg_link_selector(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002234 }
2235 crs = crs->next;
2236 }
2237}
2238
Per Liden4323add2006-01-18 00:38:21 +01002239void tipc_link_send_duplicate(struct link *l_ptr, struct link *tunnel)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002240{
2241 struct sk_buff *iter;
2242 struct tipc_msg tunnel_hdr;
2243
Allan Stephensc68ca7b2010-05-11 14:30:12 +00002244 tipc_msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
Allan Stephens75715212008-06-04 17:37:34 -07002245 DUPLICATE_MSG, INT_H_SIZE, l_ptr->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002246 msg_set_msgcnt(&tunnel_hdr, l_ptr->out_queue_size);
2247 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2248 iter = l_ptr->first_out;
2249 while (iter) {
2250 struct sk_buff *outbuf;
2251 struct tipc_msg *msg = buf_msg(iter);
2252 u32 length = msg_size(msg);
2253
2254 if (msg_user(msg) == MSG_BUNDLER)
2255 msg_set_type(msg, CLOSED_MSG);
2256 msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002257 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002258 msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002259 outbuf = tipc_buf_acquire(length + INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002260 if (outbuf == NULL) {
Allan Stephensa10bd922006-06-25 23:52:17 -07002261 warn("Link changeover error, "
2262 "unable to send duplicate msg\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002263 return;
2264 }
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002265 skb_copy_to_linear_data(outbuf, &tunnel_hdr, INT_H_SIZE);
2266 skb_copy_to_linear_data_offset(outbuf, INT_H_SIZE, iter->data,
2267 length);
Per Liden4323add2006-01-18 00:38:21 +01002268 tipc_link_send_buf(tunnel, outbuf);
2269 if (!tipc_link_is_up(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002270 return;
2271 iter = iter->next;
2272 }
2273}
2274
2275
2276
2277/**
2278 * buf_extract - extracts embedded TIPC message from another message
2279 * @skb: encapsulating message buffer
2280 * @from_pos: offset to extract from
2281 *
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002282 * Returns a new message buffer containing an embedded message. The
Per Lidenb97bf3f2006-01-02 19:04:38 +01002283 * encapsulating message itself is left unchanged.
2284 */
2285
2286static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)
2287{
2288 struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos);
2289 u32 size = msg_size(msg);
2290 struct sk_buff *eb;
2291
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002292 eb = tipc_buf_acquire(size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002293 if (eb)
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002294 skb_copy_to_linear_data(eb, msg, size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002295 return eb;
2296}
2297
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002298/*
Per Lidenb97bf3f2006-01-02 19:04:38 +01002299 * link_recv_changeover_msg(): Receive tunneled packet sent
2300 * via other link. Node is locked. Return extracted buffer.
2301 */
2302
2303static int link_recv_changeover_msg(struct link **l_ptr,
2304 struct sk_buff **buf)
2305{
2306 struct sk_buff *tunnel_buf = *buf;
2307 struct link *dest_link;
2308 struct tipc_msg *msg;
2309 struct tipc_msg *tunnel_msg = buf_msg(tunnel_buf);
2310 u32 msg_typ = msg_type(tunnel_msg);
2311 u32 msg_count = msg_msgcnt(tunnel_msg);
2312
2313 dest_link = (*l_ptr)->owner->links[msg_bearer_id(tunnel_msg)];
Allan Stephensb29f1422010-12-31 18:59:25 +00002314 if (!dest_link)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002315 goto exit;
Allan Stephensf1310722006-06-25 23:51:37 -07002316 if (dest_link == *l_ptr) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002317 err("Unexpected changeover message on link <%s>\n",
Allan Stephensf1310722006-06-25 23:51:37 -07002318 (*l_ptr)->name);
2319 goto exit;
2320 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002321 *l_ptr = dest_link;
2322 msg = msg_get_wrapped(tunnel_msg);
2323
2324 if (msg_typ == DUPLICATE_MSG) {
Allan Stephensb29f1422010-12-31 18:59:25 +00002325 if (less(msg_seqno(msg), mod(dest_link->next_in_no)))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002326 goto exit;
Allan Stephens0e659672010-12-31 18:59:32 +00002327 *buf = buf_extract(tunnel_buf, INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002328 if (*buf == NULL) {
Allan Stephensa10bd922006-06-25 23:52:17 -07002329 warn("Link changeover error, duplicate msg dropped\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002330 goto exit;
2331 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002332 buf_discard(tunnel_buf);
2333 return 1;
2334 }
2335
2336 /* First original message ?: */
2337
Per Liden4323add2006-01-18 00:38:21 +01002338 if (tipc_link_is_up(dest_link)) {
Allan Stephensa10bd922006-06-25 23:52:17 -07002339 info("Resetting link <%s>, changeover initiated by peer\n",
2340 dest_link->name);
Per Liden4323add2006-01-18 00:38:21 +01002341 tipc_link_reset(dest_link);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002342 dest_link->exp_msg_count = msg_count;
2343 if (!msg_count)
2344 goto exit;
2345 } else if (dest_link->exp_msg_count == START_CHANGEOVER) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002346 dest_link->exp_msg_count = msg_count;
2347 if (!msg_count)
2348 goto exit;
2349 }
2350
2351 /* Receive original message */
2352
2353 if (dest_link->exp_msg_count == 0) {
Allan Stephens5392d642006-06-25 23:52:50 -07002354 warn("Link switchover error, "
2355 "got too many tunnelled messages\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002356 goto exit;
2357 }
2358 dest_link->exp_msg_count--;
2359 if (less(msg_seqno(msg), dest_link->reset_checkpoint)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002360 goto exit;
2361 } else {
2362 *buf = buf_extract(tunnel_buf, INT_H_SIZE);
2363 if (*buf != NULL) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002364 buf_discard(tunnel_buf);
2365 return 1;
2366 } else {
Allan Stephensa10bd922006-06-25 23:52:17 -07002367 warn("Link changeover error, original msg dropped\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002368 }
2369 }
2370exit:
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002371 *buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002372 buf_discard(tunnel_buf);
2373 return 0;
2374}
2375
2376/*
2377 * Bundler functionality:
2378 */
Per Liden4323add2006-01-18 00:38:21 +01002379void tipc_link_recv_bundle(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002380{
2381 u32 msgcount = msg_msgcnt(buf_msg(buf));
2382 u32 pos = INT_H_SIZE;
2383 struct sk_buff *obuf;
2384
Per Lidenb97bf3f2006-01-02 19:04:38 +01002385 while (msgcount--) {
2386 obuf = buf_extract(buf, pos);
2387 if (obuf == NULL) {
Allan Stephensa10bd922006-06-25 23:52:17 -07002388 warn("Link unable to unbundle message(s)\n");
2389 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07002390 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002391 pos += align(msg_size(buf_msg(obuf)));
Per Liden4323add2006-01-18 00:38:21 +01002392 tipc_net_route_msg(obuf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002393 }
2394 buf_discard(buf);
2395}
2396
2397/*
2398 * Fragmentation/defragmentation:
2399 */
2400
2401
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002402/*
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002403 * link_send_long_buf: Entry for buffers needing fragmentation.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002404 * The buffer is complete, inclusive total message length.
Per Lidenb97bf3f2006-01-02 19:04:38 +01002405 * Returns user data length.
2406 */
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002407static int link_send_long_buf(struct link *l_ptr, struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002408{
Allan Stephens77561552011-04-17 13:06:23 -04002409 struct sk_buff *buf_chain = NULL;
2410 struct sk_buff *buf_chain_tail = (struct sk_buff *)&buf_chain;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002411 struct tipc_msg *inmsg = buf_msg(buf);
2412 struct tipc_msg fragm_hdr;
2413 u32 insize = msg_size(inmsg);
2414 u32 dsz = msg_data_sz(inmsg);
2415 unchar *crs = buf->data;
2416 u32 rest = insize;
Allan Stephens15e979d2010-05-11 14:30:10 +00002417 u32 pack_sz = l_ptr->max_pkt;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002418 u32 fragm_sz = pack_sz - INT_H_SIZE;
Allan Stephens77561552011-04-17 13:06:23 -04002419 u32 fragm_no = 0;
Allan Stephens9c396a72008-06-04 17:36:58 -07002420 u32 destaddr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002421
2422 if (msg_short(inmsg))
2423 destaddr = l_ptr->addr;
Allan Stephens9c396a72008-06-04 17:36:58 -07002424 else
2425 destaddr = msg_destnode(inmsg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002426
Per Lidenb97bf3f2006-01-02 19:04:38 +01002427 /* Prepare reusable fragment header: */
2428
Allan Stephensc68ca7b2010-05-11 14:30:12 +00002429 tipc_msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
Allan Stephens75715212008-06-04 17:37:34 -07002430 INT_H_SIZE, destaddr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002431
2432 /* Chop up message: */
2433
2434 while (rest > 0) {
2435 struct sk_buff *fragm;
2436
2437 if (rest <= fragm_sz) {
2438 fragm_sz = rest;
2439 msg_set_type(&fragm_hdr, LAST_FRAGMENT);
2440 }
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002441 fragm = tipc_buf_acquire(fragm_sz + INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002442 if (fragm == NULL) {
Allan Stephens77561552011-04-17 13:06:23 -04002443 buf_discard(buf);
2444 while (buf_chain) {
2445 buf = buf_chain;
2446 buf_chain = buf_chain->next;
2447 buf_discard(buf);
2448 }
2449 return -ENOMEM;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002450 }
2451 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
Allan Stephens77561552011-04-17 13:06:23 -04002452 fragm_no++;
2453 msg_set_fragm_no(&fragm_hdr, fragm_no);
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002454 skb_copy_to_linear_data(fragm, &fragm_hdr, INT_H_SIZE);
2455 skb_copy_to_linear_data_offset(fragm, INT_H_SIZE, crs,
2456 fragm_sz);
Allan Stephens77561552011-04-17 13:06:23 -04002457 buf_chain_tail->next = fragm;
2458 buf_chain_tail = fragm;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002459
Per Lidenb97bf3f2006-01-02 19:04:38 +01002460 rest -= fragm_sz;
2461 crs += fragm_sz;
2462 msg_set_type(&fragm_hdr, FRAGMENT);
2463 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002464 buf_discard(buf);
Allan Stephens77561552011-04-17 13:06:23 -04002465
2466 /* Append chain of fragments to send queue & send them */
2467
2468 l_ptr->long_msg_seq_no++;
2469 link_add_chain_to_outqueue(l_ptr, buf_chain, l_ptr->long_msg_seq_no);
2470 l_ptr->stats.sent_fragments += fragm_no;
2471 l_ptr->stats.sent_fragmented++;
2472 tipc_link_push_queue(l_ptr);
2473
Per Lidenb97bf3f2006-01-02 19:04:38 +01002474 return dsz;
2475}
2476
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002477/*
2478 * A pending message being re-assembled must store certain values
2479 * to handle subsequent fragments correctly. The following functions
Per Lidenb97bf3f2006-01-02 19:04:38 +01002480 * help storing these values in unused, available fields in the
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002481 * pending message. This makes dynamic memory allocation unnecessary.
Per Lidenb97bf3f2006-01-02 19:04:38 +01002482 */
2483
Sam Ravnborg05790c62006-03-20 22:37:04 -08002484static void set_long_msg_seqno(struct sk_buff *buf, u32 seqno)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002485{
2486 msg_set_seqno(buf_msg(buf), seqno);
2487}
2488
Sam Ravnborg05790c62006-03-20 22:37:04 -08002489static u32 get_fragm_size(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002490{
2491 return msg_ack(buf_msg(buf));
2492}
2493
Sam Ravnborg05790c62006-03-20 22:37:04 -08002494static void set_fragm_size(struct sk_buff *buf, u32 sz)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002495{
2496 msg_set_ack(buf_msg(buf), sz);
2497}
2498
Sam Ravnborg05790c62006-03-20 22:37:04 -08002499static u32 get_expected_frags(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002500{
2501 return msg_bcast_ack(buf_msg(buf));
2502}
2503
Sam Ravnborg05790c62006-03-20 22:37:04 -08002504static void set_expected_frags(struct sk_buff *buf, u32 exp)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002505{
2506 msg_set_bcast_ack(buf_msg(buf), exp);
2507}
2508
Sam Ravnborg05790c62006-03-20 22:37:04 -08002509static u32 get_timer_cnt(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002510{
2511 return msg_reroute_cnt(buf_msg(buf));
2512}
2513
Sam Ravnborg05790c62006-03-20 22:37:04 -08002514static void incr_timer_cnt(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002515{
2516 msg_incr_reroute_cnt(buf_msg(buf));
2517}
2518
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002519/*
2520 * tipc_link_recv_fragment(): Called with node lock on. Returns
Per Lidenb97bf3f2006-01-02 19:04:38 +01002521 * the reassembled buffer if message is complete.
2522 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002523int tipc_link_recv_fragment(struct sk_buff **pending, struct sk_buff **fb,
Per Liden4323add2006-01-18 00:38:21 +01002524 struct tipc_msg **m)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002525{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002526 struct sk_buff *prev = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002527 struct sk_buff *fbuf = *fb;
2528 struct tipc_msg *fragm = buf_msg(fbuf);
2529 struct sk_buff *pbuf = *pending;
2530 u32 long_msg_seq_no = msg_long_msgno(fragm);
2531
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002532 *fb = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002533
2534 /* Is there an incomplete message waiting for this fragment? */
2535
Joe Perchesf64f9e72009-11-29 16:55:45 -08002536 while (pbuf && ((msg_seqno(buf_msg(pbuf)) != long_msg_seq_no) ||
2537 (msg_orignode(fragm) != msg_orignode(buf_msg(pbuf))))) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002538 prev = pbuf;
2539 pbuf = pbuf->next;
2540 }
2541
2542 if (!pbuf && (msg_type(fragm) == FIRST_FRAGMENT)) {
2543 struct tipc_msg *imsg = (struct tipc_msg *)msg_data(fragm);
2544 u32 msg_sz = msg_size(imsg);
2545 u32 fragm_sz = msg_data_sz(fragm);
2546 u32 exp_fragm_cnt = msg_sz/fragm_sz + !!(msg_sz % fragm_sz);
Allan Stephens741d9eb2011-05-31 15:03:18 -04002547 u32 max = TIPC_MAX_USER_MSG_SIZE + NAMED_H_SIZE;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002548 if (msg_type(imsg) == TIPC_MCAST_MSG)
2549 max = TIPC_MAX_USER_MSG_SIZE + MCAST_H_SIZE;
2550 if (msg_size(imsg) > max) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002551 buf_discard(fbuf);
2552 return 0;
2553 }
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002554 pbuf = tipc_buf_acquire(msg_size(imsg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002555 if (pbuf != NULL) {
2556 pbuf->next = *pending;
2557 *pending = pbuf;
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002558 skb_copy_to_linear_data(pbuf, imsg,
2559 msg_data_sz(fragm));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002560 /* Prepare buffer for subsequent fragments. */
2561
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002562 set_long_msg_seqno(pbuf, long_msg_seq_no);
Allan Stephens0e659672010-12-31 18:59:32 +00002563 set_fragm_size(pbuf, fragm_sz);
2564 set_expected_frags(pbuf, exp_fragm_cnt - 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002565 } else {
Allan Stephensa10bd922006-06-25 23:52:17 -07002566 warn("Link unable to reassemble fragmented message\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002567 }
2568 buf_discard(fbuf);
2569 return 0;
2570 } else if (pbuf && (msg_type(fragm) != FIRST_FRAGMENT)) {
2571 u32 dsz = msg_data_sz(fragm);
2572 u32 fsz = get_fragm_size(pbuf);
2573 u32 crs = ((msg_fragm_no(fragm) - 1) * fsz);
2574 u32 exp_frags = get_expected_frags(pbuf) - 1;
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002575 skb_copy_to_linear_data_offset(pbuf, crs,
2576 msg_data(fragm), dsz);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002577 buf_discard(fbuf);
2578
2579 /* Is message complete? */
2580
2581 if (exp_frags == 0) {
2582 if (prev)
2583 prev->next = pbuf->next;
2584 else
2585 *pending = pbuf->next;
2586 msg_reset_reroute_cnt(buf_msg(pbuf));
2587 *fb = pbuf;
2588 *m = buf_msg(pbuf);
2589 return 1;
2590 }
Allan Stephens0e659672010-12-31 18:59:32 +00002591 set_expected_frags(pbuf, exp_frags);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002592 return 0;
2593 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002594 buf_discard(fbuf);
2595 return 0;
2596}
2597
2598/**
2599 * link_check_defragm_bufs - flush stale incoming message fragments
2600 * @l_ptr: pointer to link
2601 */
2602
2603static void link_check_defragm_bufs(struct link *l_ptr)
2604{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002605 struct sk_buff *prev = NULL;
2606 struct sk_buff *next = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002607 struct sk_buff *buf = l_ptr->defragm_buf;
2608
2609 if (!buf)
2610 return;
2611 if (!link_working_working(l_ptr))
2612 return;
2613 while (buf) {
2614 u32 cnt = get_timer_cnt(buf);
2615
2616 next = buf->next;
2617 if (cnt < 4) {
2618 incr_timer_cnt(buf);
2619 prev = buf;
2620 } else {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002621 if (prev)
2622 prev->next = buf->next;
2623 else
2624 l_ptr->defragm_buf = buf->next;
2625 buf_discard(buf);
2626 }
2627 buf = next;
2628 }
2629}
2630
2631
2632
2633static void link_set_supervision_props(struct link *l_ptr, u32 tolerance)
2634{
Allan Stephens5413b4c2011-01-18 13:24:55 -05002635 if ((tolerance < TIPC_MIN_LINK_TOL) || (tolerance > TIPC_MAX_LINK_TOL))
2636 return;
2637
Per Lidenb97bf3f2006-01-02 19:04:38 +01002638 l_ptr->tolerance = tolerance;
2639 l_ptr->continuity_interval =
2640 ((tolerance / 4) > 500) ? 500 : tolerance / 4;
2641 l_ptr->abort_limit = tolerance / (l_ptr->continuity_interval / 4);
2642}
2643
2644
Per Liden4323add2006-01-18 00:38:21 +01002645void tipc_link_set_queue_limits(struct link *l_ptr, u32 window)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002646{
2647 /* Data messages from this node, inclusive FIRST_FRAGM */
Allan Stephens06d82c92008-03-06 15:06:55 -08002648 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE] = window;
2649 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE] = (window / 3) * 4;
2650 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE] = (window / 3) * 5;
2651 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE] = (window / 3) * 6;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002652 /* Transiting data messages,inclusive FIRST_FRAGM */
Allan Stephens06d82c92008-03-06 15:06:55 -08002653 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE + 4] = 300;
2654 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE + 4] = 600;
2655 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE + 4] = 900;
2656 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE + 4] = 1200;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002657 l_ptr->queue_limit[CONN_MANAGER] = 1200;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002658 l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;
2659 l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000;
2660 /* FRAGMENT and LAST_FRAGMENT packets */
2661 l_ptr->queue_limit[MSG_FRAGMENTER] = 4000;
2662}
2663
2664/**
2665 * link_find_link - locate link by name
2666 * @name - ptr to link name string
2667 * @node - ptr to area to be filled with ptr to associated node
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002668 *
Per Liden4323add2006-01-18 00:38:21 +01002669 * Caller must hold 'tipc_net_lock' to ensure node and bearer are not deleted;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002670 * this also prevents link deletion.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002671 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01002672 * Returns pointer to link (or 0 if invalid link name).
2673 */
2674
David S. Miller6c000552008-09-02 23:38:32 -07002675static struct link *link_find_link(const char *name, struct tipc_node **node)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002676{
2677 struct link_name link_name_parts;
Allan Stephens2d627b92011-01-07 13:00:11 -05002678 struct tipc_bearer *b_ptr;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002679 struct link *l_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002680
2681 if (!link_name_validate(name, &link_name_parts))
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002682 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002683
Per Liden4323add2006-01-18 00:38:21 +01002684 b_ptr = tipc_bearer_find_interface(link_name_parts.if_local);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002685 if (!b_ptr)
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002686 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002687
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002688 *node = tipc_node_find(link_name_parts.addr_peer);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002689 if (!*node)
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002690 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002691
2692 l_ptr = (*node)->links[b_ptr->identity];
2693 if (!l_ptr || strcmp(l_ptr->name, name))
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002694 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002695
2696 return l_ptr;
2697}
2698
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002699struct sk_buff *tipc_link_cmd_config(const void *req_tlv_area, int req_tlv_space,
Per Liden4323add2006-01-18 00:38:21 +01002700 u16 cmd)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002701{
2702 struct tipc_link_config *args;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002703 u32 new_value;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002704 struct link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -07002705 struct tipc_node *node;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002706 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002707
2708 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG))
Per Liden4323add2006-01-18 00:38:21 +01002709 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002710
2711 args = (struct tipc_link_config *)TLV_DATA(req_tlv_area);
2712 new_value = ntohl(args->value);
2713
Per Liden4323add2006-01-18 00:38:21 +01002714 if (!strcmp(args->name, tipc_bclink_name)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002715 if ((cmd == TIPC_CMD_SET_LINK_WINDOW) &&
Per Liden4323add2006-01-18 00:38:21 +01002716 (tipc_bclink_set_queue_limits(new_value) == 0))
2717 return tipc_cfg_reply_none();
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002718 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
Per Liden4323add2006-01-18 00:38:21 +01002719 " (cannot change setting on broadcast link)");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002720 }
2721
Per Liden4323add2006-01-18 00:38:21 +01002722 read_lock_bh(&tipc_net_lock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002723 l_ptr = link_find_link(args->name, &node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002724 if (!l_ptr) {
Per Liden4323add2006-01-18 00:38:21 +01002725 read_unlock_bh(&tipc_net_lock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002726 return tipc_cfg_reply_error_string("link not found");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002727 }
2728
Per Liden4323add2006-01-18 00:38:21 +01002729 tipc_node_lock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002730 res = -EINVAL;
2731 switch (cmd) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002732 case TIPC_CMD_SET_LINK_TOL:
2733 if ((new_value >= TIPC_MIN_LINK_TOL) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01002734 (new_value <= TIPC_MAX_LINK_TOL)) {
2735 link_set_supervision_props(l_ptr, new_value);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002736 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
Per Liden4323add2006-01-18 00:38:21 +01002737 0, 0, new_value, 0, 0);
Allan Stephens0e35fd52008-07-14 22:44:01 -07002738 res = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002739 }
2740 break;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002741 case TIPC_CMD_SET_LINK_PRI:
Per Liden16cb4b32006-01-13 22:22:22 +01002742 if ((new_value >= TIPC_MIN_LINK_PRI) &&
2743 (new_value <= TIPC_MAX_LINK_PRI)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002744 l_ptr->priority = new_value;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002745 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
Per Liden4323add2006-01-18 00:38:21 +01002746 0, 0, 0, new_value, 0);
Allan Stephens0e35fd52008-07-14 22:44:01 -07002747 res = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002748 }
2749 break;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002750 case TIPC_CMD_SET_LINK_WINDOW:
2751 if ((new_value >= TIPC_MIN_LINK_WIN) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01002752 (new_value <= TIPC_MAX_LINK_WIN)) {
Per Liden4323add2006-01-18 00:38:21 +01002753 tipc_link_set_queue_limits(l_ptr, new_value);
Allan Stephens0e35fd52008-07-14 22:44:01 -07002754 res = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002755 }
2756 break;
2757 }
Per Liden4323add2006-01-18 00:38:21 +01002758 tipc_node_unlock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002759
Per Liden4323add2006-01-18 00:38:21 +01002760 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002761 if (res)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002762 return tipc_cfg_reply_error_string("cannot change link setting");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002763
Per Liden4323add2006-01-18 00:38:21 +01002764 return tipc_cfg_reply_none();
Per Lidenb97bf3f2006-01-02 19:04:38 +01002765}
2766
2767/**
2768 * link_reset_statistics - reset link statistics
2769 * @l_ptr: pointer to link
2770 */
2771
2772static void link_reset_statistics(struct link *l_ptr)
2773{
2774 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
2775 l_ptr->stats.sent_info = l_ptr->next_out_no;
2776 l_ptr->stats.recv_info = l_ptr->next_in_no;
2777}
2778
Per Liden4323add2006-01-18 00:38:21 +01002779struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002780{
2781 char *link_name;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002782 struct link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -07002783 struct tipc_node *node;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002784
2785 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
Per Liden4323add2006-01-18 00:38:21 +01002786 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002787
2788 link_name = (char *)TLV_DATA(req_tlv_area);
Per Liden4323add2006-01-18 00:38:21 +01002789 if (!strcmp(link_name, tipc_bclink_name)) {
2790 if (tipc_bclink_reset_stats())
2791 return tipc_cfg_reply_error_string("link not found");
2792 return tipc_cfg_reply_none();
Per Lidenb97bf3f2006-01-02 19:04:38 +01002793 }
2794
Per Liden4323add2006-01-18 00:38:21 +01002795 read_lock_bh(&tipc_net_lock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002796 l_ptr = link_find_link(link_name, &node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002797 if (!l_ptr) {
Per Liden4323add2006-01-18 00:38:21 +01002798 read_unlock_bh(&tipc_net_lock);
2799 return tipc_cfg_reply_error_string("link not found");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002800 }
2801
Per Liden4323add2006-01-18 00:38:21 +01002802 tipc_node_lock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002803 link_reset_statistics(l_ptr);
Per Liden4323add2006-01-18 00:38:21 +01002804 tipc_node_unlock(node);
2805 read_unlock_bh(&tipc_net_lock);
2806 return tipc_cfg_reply_none();
Per Lidenb97bf3f2006-01-02 19:04:38 +01002807}
2808
2809/**
2810 * percent - convert count to a percentage of total (rounding up or down)
2811 */
2812
2813static u32 percent(u32 count, u32 total)
2814{
2815 return (count * 100 + (total / 2)) / total;
2816}
2817
2818/**
Per Liden4323add2006-01-18 00:38:21 +01002819 * tipc_link_stats - print link statistics
Per Lidenb97bf3f2006-01-02 19:04:38 +01002820 * @name: link name
2821 * @buf: print buffer area
2822 * @buf_size: size of print buffer area
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002823 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01002824 * Returns length of print buffer data string (or 0 if error)
2825 */
2826
Per Liden4323add2006-01-18 00:38:21 +01002827static int tipc_link_stats(const char *name, char *buf, const u32 buf_size)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002828{
2829 struct print_buf pb;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002830 struct link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -07002831 struct tipc_node *node;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002832 char *status;
2833 u32 profile_total = 0;
2834
Per Liden4323add2006-01-18 00:38:21 +01002835 if (!strcmp(name, tipc_bclink_name))
2836 return tipc_bclink_stats(buf, buf_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002837
Per Liden4323add2006-01-18 00:38:21 +01002838 tipc_printbuf_init(&pb, buf, buf_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002839
Per Liden4323add2006-01-18 00:38:21 +01002840 read_lock_bh(&tipc_net_lock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002841 l_ptr = link_find_link(name, &node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002842 if (!l_ptr) {
Per Liden4323add2006-01-18 00:38:21 +01002843 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002844 return 0;
2845 }
Per Liden4323add2006-01-18 00:38:21 +01002846 tipc_node_lock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002847
Per Liden4323add2006-01-18 00:38:21 +01002848 if (tipc_link_is_active(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002849 status = "ACTIVE";
Per Liden4323add2006-01-18 00:38:21 +01002850 else if (tipc_link_is_up(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002851 status = "STANDBY";
2852 else
2853 status = "DEFUNCT";
2854 tipc_printf(&pb, "Link <%s>\n"
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002855 " %s MTU:%u Priority:%u Tolerance:%u ms"
2856 " Window:%u packets\n",
Allan Stephens15e979d2010-05-11 14:30:10 +00002857 l_ptr->name, status, l_ptr->max_pkt,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002858 l_ptr->priority, l_ptr->tolerance, l_ptr->queue_limit[0]);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002859 tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +01002860 l_ptr->next_in_no - l_ptr->stats.recv_info,
2861 l_ptr->stats.recv_fragments,
2862 l_ptr->stats.recv_fragmented,
2863 l_ptr->stats.recv_bundles,
2864 l_ptr->stats.recv_bundled);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002865 tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +01002866 l_ptr->next_out_no - l_ptr->stats.sent_info,
2867 l_ptr->stats.sent_fragments,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002868 l_ptr->stats.sent_fragmented,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002869 l_ptr->stats.sent_bundles,
2870 l_ptr->stats.sent_bundled);
2871 profile_total = l_ptr->stats.msg_length_counts;
2872 if (!profile_total)
2873 profile_total = 1;
2874 tipc_printf(&pb, " TX profile sample:%u packets average:%u octets\n"
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002875 " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% "
Allan Stephens0f305bf2011-05-30 15:36:56 -04002876 "-16384:%u%% -32768:%u%% -66000:%u%%\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +01002877 l_ptr->stats.msg_length_counts,
2878 l_ptr->stats.msg_lengths_total / profile_total,
2879 percent(l_ptr->stats.msg_length_profile[0], profile_total),
2880 percent(l_ptr->stats.msg_length_profile[1], profile_total),
2881 percent(l_ptr->stats.msg_length_profile[2], profile_total),
2882 percent(l_ptr->stats.msg_length_profile[3], profile_total),
2883 percent(l_ptr->stats.msg_length_profile[4], profile_total),
2884 percent(l_ptr->stats.msg_length_profile[5], profile_total),
2885 percent(l_ptr->stats.msg_length_profile[6], profile_total));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002886 tipc_printf(&pb, " RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +01002887 l_ptr->stats.recv_states,
2888 l_ptr->stats.recv_probes,
2889 l_ptr->stats.recv_nacks,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002890 l_ptr->stats.deferred_recv,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002891 l_ptr->stats.duplicates);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002892 tipc_printf(&pb, " TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
2893 l_ptr->stats.sent_states,
2894 l_ptr->stats.sent_probes,
2895 l_ptr->stats.sent_nacks,
2896 l_ptr->stats.sent_acks,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002897 l_ptr->stats.retransmitted);
2898 tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
2899 l_ptr->stats.bearer_congs,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002900 l_ptr->stats.link_congs,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002901 l_ptr->stats.max_queue_sz,
2902 l_ptr->stats.queue_sz_counts
2903 ? (l_ptr->stats.accu_queue_sz / l_ptr->stats.queue_sz_counts)
2904 : 0);
2905
Per Liden4323add2006-01-18 00:38:21 +01002906 tipc_node_unlock(node);
2907 read_unlock_bh(&tipc_net_lock);
2908 return tipc_printbuf_validate(&pb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002909}
2910
2911#define MAX_LINK_STATS_INFO 2000
2912
Per Liden4323add2006-01-18 00:38:21 +01002913struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002914{
2915 struct sk_buff *buf;
2916 struct tlv_desc *rep_tlv;
2917 int str_len;
2918
2919 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
Per Liden4323add2006-01-18 00:38:21 +01002920 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002921
Per Liden4323add2006-01-18 00:38:21 +01002922 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_LINK_STATS_INFO));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002923 if (!buf)
2924 return NULL;
2925
2926 rep_tlv = (struct tlv_desc *)buf->data;
2927
Per Liden4323add2006-01-18 00:38:21 +01002928 str_len = tipc_link_stats((char *)TLV_DATA(req_tlv_area),
2929 (char *)TLV_DATA(rep_tlv), MAX_LINK_STATS_INFO);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002930 if (!str_len) {
2931 buf_discard(buf);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002932 return tipc_cfg_reply_error_string("link not found");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002933 }
2934
2935 skb_put(buf, TLV_SPACE(str_len));
2936 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
2937
2938 return buf;
2939}
2940
Per Lidenb97bf3f2006-01-02 19:04:38 +01002941/**
Per Liden4323add2006-01-18 00:38:21 +01002942 * tipc_link_get_max_pkt - get maximum packet size to use when sending to destination
Per Lidenb97bf3f2006-01-02 19:04:38 +01002943 * @dest: network address of destination node
2944 * @selector: used to select from set of active links
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002945 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01002946 * If no active link can be found, uses default maximum packet size.
2947 */
2948
Per Liden4323add2006-01-18 00:38:21 +01002949u32 tipc_link_get_max_pkt(u32 dest, u32 selector)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002950{
David S. Miller6c000552008-09-02 23:38:32 -07002951 struct tipc_node *n_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002952 struct link *l_ptr;
2953 u32 res = MAX_PKT_DEFAULT;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002954
Per Lidenb97bf3f2006-01-02 19:04:38 +01002955 if (dest == tipc_own_addr)
2956 return MAX_MSG_SIZE;
2957
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002958 read_lock_bh(&tipc_net_lock);
Allan Stephens51a8e4d2010-12-31 18:59:18 +00002959 n_ptr = tipc_node_find(dest);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002960 if (n_ptr) {
Per Liden4323add2006-01-18 00:38:21 +01002961 tipc_node_lock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002962 l_ptr = n_ptr->active_links[selector & 1];
2963 if (l_ptr)
Allan Stephens15e979d2010-05-11 14:30:10 +00002964 res = l_ptr->max_pkt;
Per Liden4323add2006-01-18 00:38:21 +01002965 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002966 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002967 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002968 return res;
2969}
2970
Allan Stephens8d64a5b2010-12-31 18:59:27 +00002971static void link_print(struct link *l_ptr, const char *str)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002972{
Allan Stephens8d64a5b2010-12-31 18:59:27 +00002973 char print_area[256];
2974 struct print_buf pb;
2975 struct print_buf *buf = &pb;
2976
2977 tipc_printbuf_init(buf, print_area, sizeof(print_area));
2978
Per Lidenb97bf3f2006-01-02 19:04:38 +01002979 tipc_printf(buf, str);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002980 tipc_printf(buf, "Link %x<%s>:",
Allan Stephens2d627b92011-01-07 13:00:11 -05002981 l_ptr->addr, l_ptr->b_ptr->name);
Allan Stephens8d64a5b2010-12-31 18:59:27 +00002982
2983#ifdef CONFIG_TIPC_DEBUG
2984 if (link_reset_reset(l_ptr) || link_reset_unknown(l_ptr))
2985 goto print_state;
2986
Per Lidenb97bf3f2006-01-02 19:04:38 +01002987 tipc_printf(buf, ": NXO(%u):", mod(l_ptr->next_out_no));
2988 tipc_printf(buf, "NXI(%u):", mod(l_ptr->next_in_no));
2989 tipc_printf(buf, "SQUE");
2990 if (l_ptr->first_out) {
2991 tipc_printf(buf, "[%u..", msg_seqno(buf_msg(l_ptr->first_out)));
2992 if (l_ptr->next_out)
2993 tipc_printf(buf, "%u..",
2994 msg_seqno(buf_msg(l_ptr->next_out)));
Allan Stephensb82834e2010-05-11 14:30:04 +00002995 tipc_printf(buf, "%u]", msg_seqno(buf_msg(l_ptr->last_out)));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002996 if ((mod(msg_seqno(buf_msg(l_ptr->last_out)) -
2997 msg_seqno(buf_msg(l_ptr->first_out)))
Joe Perchesf64f9e72009-11-29 16:55:45 -08002998 != (l_ptr->out_queue_size - 1)) ||
2999 (l_ptr->last_out->next != NULL)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01003000 tipc_printf(buf, "\nSend queue inconsistency\n");
Allan Stephensc8a61b52011-01-18 13:31:32 -05003001 tipc_printf(buf, "first_out= %p ", l_ptr->first_out);
3002 tipc_printf(buf, "next_out= %p ", l_ptr->next_out);
3003 tipc_printf(buf, "last_out= %p ", l_ptr->last_out);
Per Lidenb97bf3f2006-01-02 19:04:38 +01003004 }
3005 } else
3006 tipc_printf(buf, "[]");
3007 tipc_printf(buf, "SQSIZ(%u)", l_ptr->out_queue_size);
3008 if (l_ptr->oldest_deferred_in) {
3009 u32 o = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
3010 u32 n = msg_seqno(buf_msg(l_ptr->newest_deferred_in));
3011 tipc_printf(buf, ":RQUE[%u..%u]", o, n);
3012 if (l_ptr->deferred_inqueue_sz != mod((n + 1) - o)) {
3013 tipc_printf(buf, ":RQSIZ(%u)",
3014 l_ptr->deferred_inqueue_sz);
3015 }
3016 }
Allan Stephens8d64a5b2010-12-31 18:59:27 +00003017print_state:
3018#endif
3019
Per Lidenb97bf3f2006-01-02 19:04:38 +01003020 if (link_working_unknown(l_ptr))
3021 tipc_printf(buf, ":WU");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00003022 else if (link_reset_reset(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01003023 tipc_printf(buf, ":RR");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00003024 else if (link_reset_unknown(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01003025 tipc_printf(buf, ":RU");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00003026 else if (link_working_working(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01003027 tipc_printf(buf, ":WW");
3028 tipc_printf(buf, "\n");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00003029
3030 tipc_printbuf_validate(buf);
3031 info("%s", print_area);
Per Lidenb97bf3f2006-01-02 19:04:38 +01003032}
3033