blob: 6ffae0e8809e5dc875a3c381b5109d14a0996ded [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,
95 u32 num_sect, u32 destnode);
96static void link_check_defragm_bufs(struct link *l_ptr);
97static void link_state_event(struct link *l_ptr, u32 event);
98static void link_reset_statistics(struct link *l_ptr);
Allan Stephens8d64a5b2010-12-31 18:59:27 +000099static void link_print(struct link *l_ptr, const char *str);
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000100static void link_start(struct link *l_ptr);
101static int link_send_long_buf(struct link *l_ptr, struct sk_buff *buf);
102
Per Lidenb97bf3f2006-01-02 19:04:38 +0100103/*
Sam Ravnborg05790c62006-03-20 22:37:04 -0800104 * Simple link routines
Per Lidenb97bf3f2006-01-02 19:04:38 +0100105 */
106
Sam Ravnborg05790c62006-03-20 22:37:04 -0800107static unsigned int align(unsigned int i)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100108{
109 return (i + 3) & ~3u;
110}
111
Sam Ravnborg05790c62006-03-20 22:37:04 -0800112static void link_init_max_pkt(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100113{
114 u32 max_pkt;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900115
Allan Stephens2d627b92011-01-07 13:00:11 -0500116 max_pkt = (l_ptr->b_ptr->mtu & ~3);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100117 if (max_pkt > MAX_MSG_SIZE)
118 max_pkt = MAX_MSG_SIZE;
119
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900120 l_ptr->max_pkt_target = max_pkt;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100121 if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT)
122 l_ptr->max_pkt = l_ptr->max_pkt_target;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900123 else
Per Lidenb97bf3f2006-01-02 19:04:38 +0100124 l_ptr->max_pkt = MAX_PKT_DEFAULT;
125
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900126 l_ptr->max_pkt_probes = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100127}
128
Sam Ravnborg05790c62006-03-20 22:37:04 -0800129static u32 link_next_sent(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100130{
131 if (l_ptr->next_out)
132 return msg_seqno(buf_msg(l_ptr->next_out));
133 return mod(l_ptr->next_out_no);
134}
135
Sam Ravnborg05790c62006-03-20 22:37:04 -0800136static u32 link_last_sent(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100137{
138 return mod(link_next_sent(l_ptr) - 1);
139}
140
141/*
Sam Ravnborg05790c62006-03-20 22:37:04 -0800142 * Simple non-static link routines (i.e. referenced outside this file)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100143 */
144
Per Liden4323add2006-01-18 00:38:21 +0100145int tipc_link_is_up(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100146{
147 if (!l_ptr)
148 return 0;
Eric Dumazeta02cec22010-09-22 20:43:57 +0000149 return link_working_working(l_ptr) || link_working_unknown(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100150}
151
Per Liden4323add2006-01-18 00:38:21 +0100152int tipc_link_is_active(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100153{
Eric Dumazeta02cec22010-09-22 20:43:57 +0000154 return (l_ptr->owner->active_links[0] == l_ptr) ||
155 (l_ptr->owner->active_links[1] == l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100156}
157
158/**
159 * link_name_validate - validate & (optionally) deconstruct link name
160 * @name - ptr to link name string
161 * @name_parts - ptr to area for link name components (or NULL if not needed)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900162 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100163 * Returns 1 if link name is valid, otherwise 0.
164 */
165
166static int link_name_validate(const char *name, struct link_name *name_parts)
167{
168 char name_copy[TIPC_MAX_LINK_NAME];
169 char *addr_local;
170 char *if_local;
171 char *addr_peer;
172 char *if_peer;
173 char dummy;
174 u32 z_local, c_local, n_local;
175 u32 z_peer, c_peer, n_peer;
176 u32 if_local_len;
177 u32 if_peer_len;
178
179 /* copy link name & ensure length is OK */
180
181 name_copy[TIPC_MAX_LINK_NAME - 1] = 0;
182 /* need above in case non-Posix strncpy() doesn't pad with nulls */
183 strncpy(name_copy, name, TIPC_MAX_LINK_NAME);
184 if (name_copy[TIPC_MAX_LINK_NAME - 1] != 0)
185 return 0;
186
187 /* ensure all component parts of link name are present */
188
189 addr_local = name_copy;
Allan Stephens2db99832010-12-31 18:59:33 +0000190 if_local = strchr(addr_local, ':');
191 if (if_local == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100192 return 0;
193 *(if_local++) = 0;
Allan Stephens2db99832010-12-31 18:59:33 +0000194 addr_peer = strchr(if_local, '-');
195 if (addr_peer == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100196 return 0;
197 *(addr_peer++) = 0;
198 if_local_len = addr_peer - if_local;
Allan Stephens2db99832010-12-31 18:59:33 +0000199 if_peer = strchr(addr_peer, ':');
200 if (if_peer == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100201 return 0;
202 *(if_peer++) = 0;
203 if_peer_len = strlen(if_peer) + 1;
204
205 /* validate component parts of link name */
206
207 if ((sscanf(addr_local, "%u.%u.%u%c",
208 &z_local, &c_local, &n_local, &dummy) != 3) ||
209 (sscanf(addr_peer, "%u.%u.%u%c",
210 &z_peer, &c_peer, &n_peer, &dummy) != 3) ||
211 (z_local > 255) || (c_local > 4095) || (n_local > 4095) ||
212 (z_peer > 255) || (c_peer > 4095) || (n_peer > 4095) ||
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900213 (if_local_len <= 1) || (if_local_len > TIPC_MAX_IF_NAME) ||
214 (if_peer_len <= 1) || (if_peer_len > TIPC_MAX_IF_NAME) ||
Per Lidenb97bf3f2006-01-02 19:04:38 +0100215 (strspn(if_local, tipc_alphabet) != (if_local_len - 1)) ||
216 (strspn(if_peer, tipc_alphabet) != (if_peer_len - 1)))
217 return 0;
218
219 /* return link name components, if necessary */
220
221 if (name_parts) {
222 name_parts->addr_local = tipc_addr(z_local, c_local, n_local);
223 strcpy(name_parts->if_local, if_local);
224 name_parts->addr_peer = tipc_addr(z_peer, c_peer, n_peer);
225 strcpy(name_parts->if_peer, if_peer);
226 }
227 return 1;
228}
229
230/**
231 * link_timeout - handle expiration of link timer
232 * @l_ptr: pointer to link
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900233 *
Per Liden4323add2006-01-18 00:38:21 +0100234 * This routine must not grab "tipc_net_lock" to avoid a potential deadlock conflict
235 * with tipc_link_delete(). (There is no risk that the node will be deleted by
236 * another thread because tipc_link_delete() always cancels the link timer before
237 * tipc_node_delete() is called.)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100238 */
239
240static void link_timeout(struct link *l_ptr)
241{
Per Liden4323add2006-01-18 00:38:21 +0100242 tipc_node_lock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100243
244 /* update counters used in statistical profiling of send traffic */
245
246 l_ptr->stats.accu_queue_sz += l_ptr->out_queue_size;
247 l_ptr->stats.queue_sz_counts++;
248
Per Lidenb97bf3f2006-01-02 19:04:38 +0100249 if (l_ptr->first_out) {
250 struct tipc_msg *msg = buf_msg(l_ptr->first_out);
251 u32 length = msg_size(msg);
252
Joe Perchesf64f9e72009-11-29 16:55:45 -0800253 if ((msg_user(msg) == MSG_FRAGMENTER) &&
254 (msg_type(msg) == FIRST_FRAGMENT)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100255 length = msg_size(msg_get_wrapped(msg));
256 }
257 if (length) {
258 l_ptr->stats.msg_lengths_total += length;
259 l_ptr->stats.msg_length_counts++;
260 if (length <= 64)
261 l_ptr->stats.msg_length_profile[0]++;
262 else if (length <= 256)
263 l_ptr->stats.msg_length_profile[1]++;
264 else if (length <= 1024)
265 l_ptr->stats.msg_length_profile[2]++;
266 else if (length <= 4096)
267 l_ptr->stats.msg_length_profile[3]++;
268 else if (length <= 16384)
269 l_ptr->stats.msg_length_profile[4]++;
270 else if (length <= 32768)
271 l_ptr->stats.msg_length_profile[5]++;
272 else
273 l_ptr->stats.msg_length_profile[6]++;
274 }
275 }
276
277 /* do all other link processing performed on a periodic basis */
278
279 link_check_defragm_bufs(l_ptr);
280
281 link_state_event(l_ptr, TIMEOUT_EVT);
282
283 if (l_ptr->next_out)
Per Liden4323add2006-01-18 00:38:21 +0100284 tipc_link_push_queue(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100285
Per Liden4323add2006-01-18 00:38:21 +0100286 tipc_node_unlock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100287}
288
Sam Ravnborg05790c62006-03-20 22:37:04 -0800289static void link_set_timer(struct link *l_ptr, u32 time)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100290{
291 k_start_timer(&l_ptr->timer, time);
292}
293
294/**
Per Liden4323add2006-01-18 00:38:21 +0100295 * tipc_link_create - create a new link
Per Lidenb97bf3f2006-01-02 19:04:38 +0100296 * @b_ptr: pointer to associated bearer
297 * @peer: network address of node at other end of link
298 * @media_addr: media address to use when sending messages over link
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900299 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100300 * Returns pointer to link.
301 */
302
Allan Stephens2d627b92011-01-07 13:00:11 -0500303struct link *tipc_link_create(struct tipc_bearer *b_ptr, const u32 peer,
Per Liden4323add2006-01-18 00:38:21 +0100304 const struct tipc_media_addr *media_addr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100305{
306 struct link *l_ptr;
307 struct tipc_msg *msg;
308 char *if_name;
309
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700310 l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100311 if (!l_ptr) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700312 warn("Link creation failed, no memory\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100313 return NULL;
314 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100315
316 l_ptr->addr = peer;
Allan Stephens2d627b92011-01-07 13:00:11 -0500317 if_name = strchr(b_ptr->name, ':') + 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100318 sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:",
319 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900320 tipc_node(tipc_own_addr),
Per Lidenb97bf3f2006-01-02 19:04:38 +0100321 if_name,
322 tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
323 /* note: peer i/f is appended to link name by reset/activate */
324 memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100325 l_ptr->checkpoint = 1;
326 l_ptr->b_ptr = b_ptr;
327 link_set_supervision_props(l_ptr, b_ptr->media->tolerance);
328 l_ptr->state = RESET_UNKNOWN;
329
330 l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
331 msg = l_ptr->pmsg;
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000332 tipc_msg_init(msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, l_ptr->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100333 msg_set_size(msg, sizeof(l_ptr->proto_msg));
Allan Stephensa686e682008-06-04 17:29:39 -0700334 msg_set_session(msg, (tipc_random & 0xffff));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100335 msg_set_bearer_id(msg, b_ptr->identity);
336 strcpy((char *)msg_data(msg), if_name);
337
338 l_ptr->priority = b_ptr->priority;
Per Liden4323add2006-01-18 00:38:21 +0100339 tipc_link_set_queue_limits(l_ptr, b_ptr->media->window);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100340
341 link_init_max_pkt(l_ptr);
342
343 l_ptr->next_out_no = 1;
344 INIT_LIST_HEAD(&l_ptr->waiting_ports);
345
346 link_reset_statistics(l_ptr);
347
Per Liden4323add2006-01-18 00:38:21 +0100348 l_ptr->owner = tipc_node_attach_link(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100349 if (!l_ptr->owner) {
350 kfree(l_ptr);
351 return NULL;
352 }
353
Florian Westphal945710652007-07-26 00:05:07 -0700354 k_init_timer(&l_ptr->timer, (Handler)link_timeout, (unsigned long)l_ptr);
355 list_add_tail(&l_ptr->link_list, &b_ptr->links);
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000356 tipc_k_signal((Handler)link_start, (unsigned long)l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100357
Per Lidenb97bf3f2006-01-02 19:04:38 +0100358 return l_ptr;
359}
360
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900361/**
Per Liden4323add2006-01-18 00:38:21 +0100362 * tipc_link_delete - delete a link
Per Lidenb97bf3f2006-01-02 19:04:38 +0100363 * @l_ptr: pointer to link
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900364 *
Per Liden4323add2006-01-18 00:38:21 +0100365 * Note: 'tipc_net_lock' is write_locked, bearer is locked.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100366 * This routine must not grab the node lock until after link timer cancellation
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900367 * to avoid a potential deadlock situation.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100368 */
369
Per Liden4323add2006-01-18 00:38:21 +0100370void tipc_link_delete(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100371{
372 if (!l_ptr) {
373 err("Attempt to delete non-existent link\n");
374 return;
375 }
376
Per Lidenb97bf3f2006-01-02 19:04:38 +0100377 k_cancel_timer(&l_ptr->timer);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900378
Per Liden4323add2006-01-18 00:38:21 +0100379 tipc_node_lock(l_ptr->owner);
380 tipc_link_reset(l_ptr);
381 tipc_node_detach_link(l_ptr->owner, l_ptr);
382 tipc_link_stop(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100383 list_del_init(&l_ptr->link_list);
Per Liden4323add2006-01-18 00:38:21 +0100384 tipc_node_unlock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100385 k_term_timer(&l_ptr->timer);
386 kfree(l_ptr);
387}
388
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000389static void link_start(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100390{
Allan Stephens214dda42011-01-24 16:22:43 -0500391 tipc_node_lock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100392 link_state_event(l_ptr, STARTING_EVT);
Allan Stephens214dda42011-01-24 16:22:43 -0500393 tipc_node_unlock(l_ptr->owner);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100394}
395
396/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900397 * link_schedule_port - schedule port for deferred sending
Per Lidenb97bf3f2006-01-02 19:04:38 +0100398 * @l_ptr: pointer to link
399 * @origport: reference to sending port
400 * @sz: amount of data to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900401 *
402 * Schedules port for renewed sending of messages after link congestion
Per Lidenb97bf3f2006-01-02 19:04:38 +0100403 * has abated.
404 */
405
406static int link_schedule_port(struct link *l_ptr, u32 origport, u32 sz)
407{
Allan Stephens23dd4cc2011-01-07 11:43:40 -0500408 struct tipc_port *p_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100409
Per Liden4323add2006-01-18 00:38:21 +0100410 spin_lock_bh(&tipc_port_list_lock);
411 p_ptr = tipc_port_lock(origport);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100412 if (p_ptr) {
413 if (!p_ptr->wakeup)
414 goto exit;
415 if (!list_empty(&p_ptr->wait_list))
416 goto exit;
Allan Stephens23dd4cc2011-01-07 11:43:40 -0500417 p_ptr->congested = 1;
Allan Stephens15e979d2010-05-11 14:30:10 +0000418 p_ptr->waiting_pkts = 1 + ((sz - 1) / l_ptr->max_pkt);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100419 list_add_tail(&p_ptr->wait_list, &l_ptr->waiting_ports);
420 l_ptr->stats.link_congs++;
421exit:
Per Liden4323add2006-01-18 00:38:21 +0100422 tipc_port_unlock(p_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100423 }
Per Liden4323add2006-01-18 00:38:21 +0100424 spin_unlock_bh(&tipc_port_list_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100425 return -ELINKCONG;
426}
427
Per Liden4323add2006-01-18 00:38:21 +0100428void tipc_link_wakeup_ports(struct link *l_ptr, int all)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100429{
Allan Stephens23dd4cc2011-01-07 11:43:40 -0500430 struct tipc_port *p_ptr;
431 struct tipc_port *temp_p_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100432 int win = l_ptr->queue_limit[0] - l_ptr->out_queue_size;
433
434 if (all)
435 win = 100000;
436 if (win <= 0)
437 return;
Per Liden4323add2006-01-18 00:38:21 +0100438 if (!spin_trylock_bh(&tipc_port_list_lock))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100439 return;
440 if (link_congested(l_ptr))
441 goto exit;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900442 list_for_each_entry_safe(p_ptr, temp_p_ptr, &l_ptr->waiting_ports,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100443 wait_list) {
444 if (win <= 0)
445 break;
446 list_del_init(&p_ptr->wait_list);
Allan Stephens23dd4cc2011-01-07 11:43:40 -0500447 spin_lock_bh(p_ptr->lock);
448 p_ptr->congested = 0;
449 p_ptr->wakeup(p_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100450 win -= p_ptr->waiting_pkts;
Allan Stephens23dd4cc2011-01-07 11:43:40 -0500451 spin_unlock_bh(p_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100452 }
453
454exit:
Per Liden4323add2006-01-18 00:38:21 +0100455 spin_unlock_bh(&tipc_port_list_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100456}
457
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900458/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100459 * link_release_outqueue - purge link's outbound message queue
460 * @l_ptr: pointer to link
461 */
462
463static void link_release_outqueue(struct link *l_ptr)
464{
465 struct sk_buff *buf = l_ptr->first_out;
466 struct sk_buff *next;
467
468 while (buf) {
469 next = buf->next;
470 buf_discard(buf);
471 buf = next;
472 }
473 l_ptr->first_out = NULL;
474 l_ptr->out_queue_size = 0;
475}
476
477/**
Per Liden4323add2006-01-18 00:38:21 +0100478 * tipc_link_reset_fragments - purge link's inbound message fragments queue
Per Lidenb97bf3f2006-01-02 19:04:38 +0100479 * @l_ptr: pointer to link
480 */
481
Per Liden4323add2006-01-18 00:38:21 +0100482void tipc_link_reset_fragments(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100483{
484 struct sk_buff *buf = l_ptr->defragm_buf;
485 struct sk_buff *next;
486
487 while (buf) {
488 next = buf->next;
489 buf_discard(buf);
490 buf = next;
491 }
492 l_ptr->defragm_buf = NULL;
493}
494
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900495/**
Per Liden4323add2006-01-18 00:38:21 +0100496 * tipc_link_stop - purge all inbound and outbound messages associated with link
Per Lidenb97bf3f2006-01-02 19:04:38 +0100497 * @l_ptr: pointer to link
498 */
499
Per Liden4323add2006-01-18 00:38:21 +0100500void tipc_link_stop(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100501{
502 struct sk_buff *buf;
503 struct sk_buff *next;
504
505 buf = l_ptr->oldest_deferred_in;
506 while (buf) {
507 next = buf->next;
508 buf_discard(buf);
509 buf = next;
510 }
511
512 buf = l_ptr->first_out;
513 while (buf) {
514 next = buf->next;
515 buf_discard(buf);
516 buf = next;
517 }
518
Per Liden4323add2006-01-18 00:38:21 +0100519 tipc_link_reset_fragments(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100520
521 buf_discard(l_ptr->proto_msg_queue);
522 l_ptr->proto_msg_queue = NULL;
523}
524
Per Lidenb97bf3f2006-01-02 19:04:38 +0100525/* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100526#define link_send_event(fcn, l_ptr, up) do { } while (0)
527
Per Liden4323add2006-01-18 00:38:21 +0100528void tipc_link_reset(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100529{
530 struct sk_buff *buf;
531 u32 prev_state = l_ptr->state;
532 u32 checkpoint = l_ptr->next_in_no;
Allan Stephens5392d642006-06-25 23:52:50 -0700533 int was_active_link = tipc_link_is_active(l_ptr);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900534
Allan Stephensa686e682008-06-04 17:29:39 -0700535 msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100536
Allan Stephensa686e682008-06-04 17:29:39 -0700537 /* Link is down, accept any session */
538 l_ptr->peer_session = INVALID_SESSION;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100539
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900540 /* Prepare for max packet size negotiation */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100541 link_init_max_pkt(l_ptr);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900542
Per Lidenb97bf3f2006-01-02 19:04:38 +0100543 l_ptr->state = RESET_UNKNOWN;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100544
545 if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
546 return;
547
Per Liden4323add2006-01-18 00:38:21 +0100548 tipc_node_link_down(l_ptr->owner, l_ptr);
549 tipc_bearer_remove_dest(l_ptr->b_ptr, l_ptr->addr);
Paul Gortmaker7368ddf2010-10-12 14:25:58 +0000550
Paul Gortmaker8f19afb2011-02-28 11:36:21 -0400551 if (was_active_link && tipc_node_active_links(l_ptr->owner) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100552 l_ptr->owner->permit_changeover) {
553 l_ptr->reset_checkpoint = checkpoint;
554 l_ptr->exp_msg_count = START_CHANGEOVER;
555 }
556
557 /* Clean up all queues: */
558
559 link_release_outqueue(l_ptr);
560 buf_discard(l_ptr->proto_msg_queue);
561 l_ptr->proto_msg_queue = NULL;
562 buf = l_ptr->oldest_deferred_in;
563 while (buf) {
564 struct sk_buff *next = buf->next;
565 buf_discard(buf);
566 buf = next;
567 }
568 if (!list_empty(&l_ptr->waiting_ports))
Per Liden4323add2006-01-18 00:38:21 +0100569 tipc_link_wakeup_ports(l_ptr, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100570
571 l_ptr->retransm_queue_head = 0;
572 l_ptr->retransm_queue_size = 0;
573 l_ptr->last_out = NULL;
574 l_ptr->first_out = NULL;
575 l_ptr->next_out = NULL;
576 l_ptr->unacked_window = 0;
577 l_ptr->checkpoint = 1;
578 l_ptr->next_out_no = 1;
579 l_ptr->deferred_inqueue_sz = 0;
580 l_ptr->oldest_deferred_in = NULL;
581 l_ptr->newest_deferred_in = NULL;
582 l_ptr->fsm_msg_cnt = 0;
583 l_ptr->stale_count = 0;
584 link_reset_statistics(l_ptr);
585
Per Liden4323add2006-01-18 00:38:21 +0100586 link_send_event(tipc_cfg_link_event, l_ptr, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100587 if (!in_own_cluster(l_ptr->addr))
Per Liden4323add2006-01-18 00:38:21 +0100588 link_send_event(tipc_disc_link_event, l_ptr, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100589}
590
591
592static void link_activate(struct link *l_ptr)
593{
Allan Stephens5392d642006-06-25 23:52:50 -0700594 l_ptr->next_in_no = l_ptr->stats.recv_info = 1;
Per Liden4323add2006-01-18 00:38:21 +0100595 tipc_node_link_up(l_ptr->owner, l_ptr);
596 tipc_bearer_add_dest(l_ptr->b_ptr, l_ptr->addr);
597 link_send_event(tipc_cfg_link_event, l_ptr, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100598 if (!in_own_cluster(l_ptr->addr))
Per Liden4323add2006-01-18 00:38:21 +0100599 link_send_event(tipc_disc_link_event, l_ptr, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100600}
601
602/**
603 * link_state_event - link finite state machine
604 * @l_ptr: pointer to link
605 * @event: state machine event to process
606 */
607
608static void link_state_event(struct link *l_ptr, unsigned event)
609{
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900610 struct link *other;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100611 u32 cont_intv = l_ptr->continuity_interval;
612
613 if (!l_ptr->started && (event != STARTING_EVT))
614 return; /* Not yet. */
615
616 if (link_blocked(l_ptr)) {
Allan Stephensa0168922010-12-31 18:59:35 +0000617 if (event == TIMEOUT_EVT)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100618 link_set_timer(l_ptr, cont_intv);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100619 return; /* Changeover going on */
620 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100621
622 switch (l_ptr->state) {
623 case WORKING_WORKING:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100624 switch (event) {
625 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100626 case ACTIVATE_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100627 break;
628 case TIMEOUT_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100629 if (l_ptr->next_in_no != l_ptr->checkpoint) {
630 l_ptr->checkpoint = l_ptr->next_in_no;
Per Liden4323add2006-01-18 00:38:21 +0100631 if (tipc_bclink_acks_missing(l_ptr->owner)) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900632 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
Per Liden4323add2006-01-18 00:38:21 +0100633 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100634 l_ptr->fsm_msg_cnt++;
635 } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900636 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
Per Liden4323add2006-01-18 00:38:21 +0100637 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100638 l_ptr->fsm_msg_cnt++;
639 }
640 link_set_timer(l_ptr, cont_intv);
641 break;
642 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100643 l_ptr->state = WORKING_UNKNOWN;
644 l_ptr->fsm_msg_cnt = 0;
Per Liden4323add2006-01-18 00:38:21 +0100645 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100646 l_ptr->fsm_msg_cnt++;
647 link_set_timer(l_ptr, cont_intv / 4);
648 break;
649 case RESET_MSG:
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900650 info("Resetting link <%s>, requested by peer\n",
Allan Stephensa10bd922006-06-25 23:52:17 -0700651 l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100652 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100653 l_ptr->state = RESET_RESET;
654 l_ptr->fsm_msg_cnt = 0;
Per Liden4323add2006-01-18 00:38:21 +0100655 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100656 l_ptr->fsm_msg_cnt++;
657 link_set_timer(l_ptr, cont_intv);
658 break;
659 default:
660 err("Unknown link event %u in WW state\n", event);
661 }
662 break;
663 case WORKING_UNKNOWN:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100664 switch (event) {
665 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100666 case ACTIVATE_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100667 l_ptr->state = WORKING_WORKING;
668 l_ptr->fsm_msg_cnt = 0;
669 link_set_timer(l_ptr, cont_intv);
670 break;
671 case RESET_MSG:
Allan Stephensa10bd922006-06-25 23:52:17 -0700672 info("Resetting link <%s>, requested by peer "
673 "while probing\n", l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100674 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100675 l_ptr->state = RESET_RESET;
676 l_ptr->fsm_msg_cnt = 0;
Per Liden4323add2006-01-18 00:38:21 +0100677 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100678 l_ptr->fsm_msg_cnt++;
679 link_set_timer(l_ptr, cont_intv);
680 break;
681 case TIMEOUT_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100682 if (l_ptr->next_in_no != l_ptr->checkpoint) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100683 l_ptr->state = WORKING_WORKING;
684 l_ptr->fsm_msg_cnt = 0;
685 l_ptr->checkpoint = l_ptr->next_in_no;
Per Liden4323add2006-01-18 00:38:21 +0100686 if (tipc_bclink_acks_missing(l_ptr->owner)) {
687 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
688 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100689 l_ptr->fsm_msg_cnt++;
690 }
691 link_set_timer(l_ptr, cont_intv);
692 } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900693 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
Per Liden4323add2006-01-18 00:38:21 +0100694 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100695 l_ptr->fsm_msg_cnt++;
696 link_set_timer(l_ptr, cont_intv / 4);
697 } else { /* Link has failed */
Allan Stephensa10bd922006-06-25 23:52:17 -0700698 warn("Resetting link <%s>, peer not responding\n",
699 l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100700 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100701 l_ptr->state = RESET_UNKNOWN;
702 l_ptr->fsm_msg_cnt = 0;
Per Liden4323add2006-01-18 00:38:21 +0100703 tipc_link_send_proto_msg(l_ptr, RESET_MSG,
704 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100705 l_ptr->fsm_msg_cnt++;
706 link_set_timer(l_ptr, cont_intv);
707 }
708 break;
709 default:
710 err("Unknown link event %u in WU state\n", event);
711 }
712 break;
713 case RESET_UNKNOWN:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100714 switch (event) {
715 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100716 break;
717 case ACTIVATE_MSG:
718 other = l_ptr->owner->active_links[0];
Allan Stephens8d64a5b2010-12-31 18:59:27 +0000719 if (other && link_working_unknown(other))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100720 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100721 l_ptr->state = WORKING_WORKING;
722 l_ptr->fsm_msg_cnt = 0;
723 link_activate(l_ptr);
Per Liden4323add2006-01-18 00:38:21 +0100724 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100725 l_ptr->fsm_msg_cnt++;
726 link_set_timer(l_ptr, cont_intv);
727 break;
728 case RESET_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100729 l_ptr->state = RESET_RESET;
730 l_ptr->fsm_msg_cnt = 0;
Per Liden4323add2006-01-18 00:38:21 +0100731 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100732 l_ptr->fsm_msg_cnt++;
733 link_set_timer(l_ptr, cont_intv);
734 break;
735 case STARTING_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100736 l_ptr->started = 1;
737 /* fall through */
738 case TIMEOUT_EVT:
Per Liden4323add2006-01-18 00:38:21 +0100739 tipc_link_send_proto_msg(l_ptr, RESET_MSG, 0, 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 default:
744 err("Unknown link event %u in RU state\n", event);
745 }
746 break;
747 case RESET_RESET:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100748 switch (event) {
749 case TRAFFIC_MSG_EVT:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100750 case ACTIVATE_MSG:
751 other = l_ptr->owner->active_links[0];
Allan Stephens8d64a5b2010-12-31 18:59:27 +0000752 if (other && link_working_unknown(other))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100753 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100754 l_ptr->state = WORKING_WORKING;
755 l_ptr->fsm_msg_cnt = 0;
756 link_activate(l_ptr);
Per Liden4323add2006-01-18 00:38:21 +0100757 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100758 l_ptr->fsm_msg_cnt++;
759 link_set_timer(l_ptr, cont_intv);
760 break;
761 case RESET_MSG:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100762 break;
763 case TIMEOUT_EVT:
Per Liden4323add2006-01-18 00:38:21 +0100764 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100765 l_ptr->fsm_msg_cnt++;
766 link_set_timer(l_ptr, cont_intv);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100767 break;
768 default:
769 err("Unknown link event %u in RR state\n", event);
770 }
771 break;
772 default:
773 err("Unknown link state %u/%u\n", l_ptr->state, event);
774 }
775}
776
777/*
778 * link_bundle_buf(): Append contents of a buffer to
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900779 * the tail of an existing one.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100780 */
781
782static int link_bundle_buf(struct link *l_ptr,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900783 struct sk_buff *bundler,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100784 struct sk_buff *buf)
785{
786 struct tipc_msg *bundler_msg = buf_msg(bundler);
787 struct tipc_msg *msg = buf_msg(buf);
788 u32 size = msg_size(msg);
Allan Stephense49060c2006-06-29 12:32:46 -0700789 u32 bundle_size = msg_size(bundler_msg);
790 u32 to_pos = align(bundle_size);
791 u32 pad = to_pos - bundle_size;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100792
793 if (msg_user(bundler_msg) != MSG_BUNDLER)
794 return 0;
795 if (msg_type(bundler_msg) != OPEN_MSG)
796 return 0;
Allan Stephense49060c2006-06-29 12:32:46 -0700797 if (skb_tailroom(bundler) < (pad + size))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100798 return 0;
Allan Stephens15e979d2010-05-11 14:30:10 +0000799 if (l_ptr->max_pkt < (to_pos + size))
Allan Stephens863fae62006-07-03 19:39:36 -0700800 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100801
Allan Stephense49060c2006-06-29 12:32:46 -0700802 skb_put(bundler, pad + size);
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -0300803 skb_copy_to_linear_data_offset(bundler, to_pos, buf->data, size);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100804 msg_set_size(bundler_msg, to_pos + size);
805 msg_set_msgcnt(bundler_msg, msg_msgcnt(bundler_msg) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100806 buf_discard(buf);
807 l_ptr->stats.sent_bundled++;
808 return 1;
809}
810
Sam Ravnborg05790c62006-03-20 22:37:04 -0800811static void link_add_to_outqueue(struct link *l_ptr,
812 struct sk_buff *buf,
813 struct tipc_msg *msg)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100814{
815 u32 ack = mod(l_ptr->next_in_no - 1);
816 u32 seqno = mod(l_ptr->next_out_no++);
817
818 msg_set_word(msg, 2, ((ack << 16) | seqno));
819 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
820 buf->next = NULL;
821 if (l_ptr->first_out) {
822 l_ptr->last_out->next = buf;
823 l_ptr->last_out = buf;
824 } else
825 l_ptr->first_out = l_ptr->last_out = buf;
Allan Stephens9bd80b62011-01-18 15:02:50 -0500826
Per Lidenb97bf3f2006-01-02 19:04:38 +0100827 l_ptr->out_queue_size++;
Allan Stephens9bd80b62011-01-18 15:02:50 -0500828 if (l_ptr->out_queue_size > l_ptr->stats.max_queue_sz)
829 l_ptr->stats.max_queue_sz = l_ptr->out_queue_size;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100830}
831
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900832/*
833 * tipc_link_send_buf() is the 'full path' for messages, called from
Per Lidenb97bf3f2006-01-02 19:04:38 +0100834 * inside TIPC when the 'fast path' in tipc_send_buf
835 * has failed, and from link_send()
836 */
837
Per Liden4323add2006-01-18 00:38:21 +0100838int tipc_link_send_buf(struct link *l_ptr, struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100839{
840 struct tipc_msg *msg = buf_msg(buf);
841 u32 size = msg_size(msg);
842 u32 dsz = msg_data_sz(msg);
843 u32 queue_size = l_ptr->out_queue_size;
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000844 u32 imp = tipc_msg_tot_importance(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100845 u32 queue_limit = l_ptr->queue_limit[imp];
Allan Stephens15e979d2010-05-11 14:30:10 +0000846 u32 max_packet = l_ptr->max_pkt;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100847
848 msg_set_prevnode(msg, tipc_own_addr); /* If routed message */
849
850 /* Match msg importance against queue limits: */
851
852 if (unlikely(queue_size >= queue_limit)) {
853 if (imp <= TIPC_CRITICAL_IMPORTANCE) {
854 return link_schedule_port(l_ptr, msg_origport(msg),
855 size);
856 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100857 buf_discard(buf);
858 if (imp > CONN_MANAGER) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700859 warn("Resetting link <%s>, send queue full", l_ptr->name);
Per Liden4323add2006-01-18 00:38:21 +0100860 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100861 }
862 return dsz;
863 }
864
865 /* Fragmentation needed ? */
866
867 if (size > max_packet)
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000868 return link_send_long_buf(l_ptr, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100869
870 /* Packet can be queued or sent: */
871
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900872 if (likely(!tipc_bearer_congested(l_ptr->b_ptr, l_ptr) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100873 !link_congested(l_ptr))) {
874 link_add_to_outqueue(l_ptr, buf, msg);
875
Per Liden4323add2006-01-18 00:38:21 +0100876 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr))) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100877 l_ptr->unacked_window = 0;
878 } else {
Per Liden4323add2006-01-18 00:38:21 +0100879 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100880 l_ptr->stats.bearer_congs++;
881 l_ptr->next_out = buf;
882 }
883 return dsz;
884 }
885 /* Congestion: can message be bundled ?: */
886
887 if ((msg_user(msg) != CHANGEOVER_PROTOCOL) &&
888 (msg_user(msg) != MSG_FRAGMENTER)) {
889
890 /* Try adding message to an existing bundle */
891
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900892 if (l_ptr->next_out &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100893 link_bundle_buf(l_ptr, l_ptr->last_out, buf)) {
Per Liden4323add2006-01-18 00:38:21 +0100894 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100895 return dsz;
896 }
897
898 /* Try creating a new bundle */
899
900 if (size <= max_packet * 2 / 3) {
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000901 struct sk_buff *bundler = tipc_buf_acquire(max_packet);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100902 struct tipc_msg bundler_hdr;
903
904 if (bundler) {
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000905 tipc_msg_init(&bundler_hdr, MSG_BUNDLER, OPEN_MSG,
Allan Stephens75715212008-06-04 17:37:34 -0700906 INT_H_SIZE, l_ptr->addr);
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -0300907 skb_copy_to_linear_data(bundler, &bundler_hdr,
908 INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100909 skb_trim(bundler, INT_H_SIZE);
910 link_bundle_buf(l_ptr, bundler, buf);
911 buf = bundler;
912 msg = buf_msg(buf);
913 l_ptr->stats.sent_bundles++;
914 }
915 }
916 }
917 if (!l_ptr->next_out)
918 l_ptr->next_out = buf;
919 link_add_to_outqueue(l_ptr, buf, msg);
Per Liden4323add2006-01-18 00:38:21 +0100920 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100921 return dsz;
922}
923
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900924/*
925 * tipc_link_send(): same as tipc_link_send_buf(), but the link to use has
Per Lidenb97bf3f2006-01-02 19:04:38 +0100926 * not been selected yet, and the the owner node is not locked
927 * Called by TIPC internal users, e.g. the name distributor
928 */
929
Per Liden4323add2006-01-18 00:38:21 +0100930int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100931{
932 struct link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -0700933 struct tipc_node *n_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100934 int res = -ELINKCONG;
935
Per Liden4323add2006-01-18 00:38:21 +0100936 read_lock_bh(&tipc_net_lock);
Allan Stephens51a8e4d2010-12-31 18:59:18 +0000937 n_ptr = tipc_node_find(dest);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100938 if (n_ptr) {
Per Liden4323add2006-01-18 00:38:21 +0100939 tipc_node_lock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100940 l_ptr = n_ptr->active_links[selector & 1];
Allan Stephensa0168922010-12-31 18:59:35 +0000941 if (l_ptr)
Per Liden4323add2006-01-18 00:38:21 +0100942 res = tipc_link_send_buf(l_ptr, buf);
Allan Stephensa0168922010-12-31 18:59:35 +0000943 else
Allan Stephensc33d53b2006-06-25 23:50:30 -0700944 buf_discard(buf);
Per Liden4323add2006-01-18 00:38:21 +0100945 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100946 } else {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100947 buf_discard(buf);
948 }
Per Liden4323add2006-01-18 00:38:21 +0100949 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100950 return res;
951}
952
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900953/*
954 * link_send_buf_fast: Entry for data messages where the
Per Lidenb97bf3f2006-01-02 19:04:38 +0100955 * destination link is known and the header is complete,
956 * inclusive total message length. Very time critical.
957 * Link is locked. Returns user data length.
958 */
959
Sam Ravnborg05790c62006-03-20 22:37:04 -0800960static int link_send_buf_fast(struct link *l_ptr, struct sk_buff *buf,
961 u32 *used_max_pkt)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100962{
963 struct tipc_msg *msg = buf_msg(buf);
964 int res = msg_data_sz(msg);
965
966 if (likely(!link_congested(l_ptr))) {
Allan Stephens15e979d2010-05-11 14:30:10 +0000967 if (likely(msg_size(msg) <= l_ptr->max_pkt)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100968 if (likely(list_empty(&l_ptr->b_ptr->cong_links))) {
969 link_add_to_outqueue(l_ptr, buf, msg);
Per Liden4323add2006-01-18 00:38:21 +0100970 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf,
971 &l_ptr->media_addr))) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100972 l_ptr->unacked_window = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100973 return res;
974 }
Per Liden4323add2006-01-18 00:38:21 +0100975 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100976 l_ptr->stats.bearer_congs++;
977 l_ptr->next_out = buf;
978 return res;
979 }
Allan Stephens0e659672010-12-31 18:59:32 +0000980 } else
Allan Stephens15e979d2010-05-11 14:30:10 +0000981 *used_max_pkt = l_ptr->max_pkt;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100982 }
Per Liden4323add2006-01-18 00:38:21 +0100983 return tipc_link_send_buf(l_ptr, buf); /* All other cases */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100984}
985
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900986/*
987 * tipc_send_buf_fast: Entry for data messages where the
Per Lidenb97bf3f2006-01-02 19:04:38 +0100988 * destination node is known and the header is complete,
989 * inclusive total message length.
990 * Returns user data length.
991 */
992int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode)
993{
994 struct link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -0700995 struct tipc_node *n_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100996 int res;
997 u32 selector = msg_origport(buf_msg(buf)) & 1;
998 u32 dummy;
999
1000 if (destnode == tipc_own_addr)
Per Liden4323add2006-01-18 00:38:21 +01001001 return tipc_port_recv_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001002
Per Liden4323add2006-01-18 00:38:21 +01001003 read_lock_bh(&tipc_net_lock);
Allan Stephens51a8e4d2010-12-31 18:59:18 +00001004 n_ptr = tipc_node_find(destnode);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001005 if (likely(n_ptr)) {
Per Liden4323add2006-01-18 00:38:21 +01001006 tipc_node_lock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001007 l_ptr = n_ptr->active_links[selector];
Per Lidenb97bf3f2006-01-02 19:04:38 +01001008 if (likely(l_ptr)) {
1009 res = link_send_buf_fast(l_ptr, buf, &dummy);
Per Liden4323add2006-01-18 00:38:21 +01001010 tipc_node_unlock(n_ptr);
1011 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001012 return res;
1013 }
Per Liden4323add2006-01-18 00:38:21 +01001014 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001015 }
Per Liden4323add2006-01-18 00:38:21 +01001016 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001017 res = msg_data_sz(buf_msg(buf));
1018 tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1019 return res;
1020}
1021
1022
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001023/*
1024 * tipc_link_send_sections_fast: Entry for messages where the
Per Lidenb97bf3f2006-01-02 19:04:38 +01001025 * destination processor is known and the header is complete,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001026 * except for total message length.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001027 * Returns user data length or errno.
1028 */
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001029int tipc_link_send_sections_fast(struct tipc_port *sender,
Per Liden4323add2006-01-18 00:38:21 +01001030 struct iovec const *msg_sect,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001031 const u32 num_sect,
Per Liden4323add2006-01-18 00:38:21 +01001032 u32 destaddr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001033{
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001034 struct tipc_msg *hdr = &sender->phdr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001035 struct link *l_ptr;
1036 struct sk_buff *buf;
David S. Miller6c000552008-09-02 23:38:32 -07001037 struct tipc_node *node;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001038 int res;
1039 u32 selector = msg_origport(hdr) & 1;
1040
Per Lidenb97bf3f2006-01-02 19:04:38 +01001041again:
1042 /*
1043 * Try building message using port's max_pkt hint.
1044 * (Must not hold any locks while building message.)
1045 */
1046
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001047 res = tipc_msg_build(hdr, msg_sect, num_sect, sender->max_pkt,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001048 !sender->user_port, &buf);
1049
Per Liden4323add2006-01-18 00:38:21 +01001050 read_lock_bh(&tipc_net_lock);
Allan Stephens51a8e4d2010-12-31 18:59:18 +00001051 node = tipc_node_find(destaddr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001052 if (likely(node)) {
Per Liden4323add2006-01-18 00:38:21 +01001053 tipc_node_lock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001054 l_ptr = node->active_links[selector];
1055 if (likely(l_ptr)) {
1056 if (likely(buf)) {
1057 res = link_send_buf_fast(l_ptr, buf,
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001058 &sender->max_pkt);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001059 if (unlikely(res < 0))
1060 buf_discard(buf);
1061exit:
Per Liden4323add2006-01-18 00:38:21 +01001062 tipc_node_unlock(node);
1063 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001064 return res;
1065 }
1066
1067 /* Exit if build request was invalid */
1068
1069 if (unlikely(res < 0))
1070 goto exit;
1071
1072 /* Exit if link (or bearer) is congested */
1073
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001074 if (link_congested(l_ptr) ||
Per Lidenb97bf3f2006-01-02 19:04:38 +01001075 !list_empty(&l_ptr->b_ptr->cong_links)) {
1076 res = link_schedule_port(l_ptr,
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001077 sender->ref, res);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001078 goto exit;
1079 }
1080
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001081 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001082 * Message size exceeds max_pkt hint; update hint,
1083 * then re-try fast path or fragment the message
1084 */
1085
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001086 sender->max_pkt = l_ptr->max_pkt;
Per Liden4323add2006-01-18 00:38:21 +01001087 tipc_node_unlock(node);
1088 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001089
1090
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001091 if ((msg_hdr_sz(hdr) + res) <= sender->max_pkt)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001092 goto again;
1093
1094 return link_send_sections_long(sender, msg_sect,
1095 num_sect, destaddr);
1096 }
Per Liden4323add2006-01-18 00:38:21 +01001097 tipc_node_unlock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001098 }
Per Liden4323add2006-01-18 00:38:21 +01001099 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001100
1101 /* Couldn't find a link to the destination node */
1102
1103 if (buf)
1104 return tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1105 if (res >= 0)
Per Liden4323add2006-01-18 00:38:21 +01001106 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
1107 TIPC_ERR_NO_NODE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001108 return res;
1109}
1110
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001111/*
1112 * link_send_sections_long(): Entry for long messages where the
Per Lidenb97bf3f2006-01-02 19:04:38 +01001113 * destination node is known and the header is complete,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001114 * inclusive total message length.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001115 * Link and bearer congestion status have been checked to be ok,
1116 * and are ignored if they change.
1117 *
1118 * Note that fragments do not use the full link MTU so that they won't have
1119 * to undergo refragmentation if link changeover causes them to be sent
1120 * over another link with an additional tunnel header added as prefix.
1121 * (Refragmentation will still occur if the other link has a smaller MTU.)
1122 *
1123 * Returns user data length or errno.
1124 */
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001125static int link_send_sections_long(struct tipc_port *sender,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001126 struct iovec const *msg_sect,
1127 u32 num_sect,
1128 u32 destaddr)
1129{
1130 struct link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -07001131 struct tipc_node *node;
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001132 struct tipc_msg *hdr = &sender->phdr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001133 u32 dsz = msg_data_sz(hdr);
Allan Stephens0e659672010-12-31 18:59:32 +00001134 u32 max_pkt, fragm_sz, rest;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001135 struct tipc_msg fragm_hdr;
Allan Stephens0e659672010-12-31 18:59:32 +00001136 struct sk_buff *buf, *buf_chain, *prev;
1137 u32 fragm_crs, fragm_rest, hsz, sect_rest;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001138 const unchar *sect_crs;
1139 int curr_sect;
1140 u32 fragm_no;
1141
1142again:
1143 fragm_no = 1;
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001144 max_pkt = sender->max_pkt - INT_H_SIZE;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001145 /* leave room for tunnel header in case of link changeover */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001146 fragm_sz = max_pkt - INT_H_SIZE;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001147 /* leave room for fragmentation header in each fragment */
1148 rest = dsz;
1149 fragm_crs = 0;
1150 fragm_rest = 0;
1151 sect_rest = 0;
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001152 sect_crs = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001153 curr_sect = -1;
1154
1155 /* Prepare reusable fragment header: */
1156
Allan Stephensc68ca7b2010-05-11 14:30:12 +00001157 tipc_msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
Allan Stephens75715212008-06-04 17:37:34 -07001158 INT_H_SIZE, msg_destnode(hdr));
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001159 msg_set_link_selector(&fragm_hdr, sender->ref);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001160 msg_set_size(&fragm_hdr, max_pkt);
1161 msg_set_fragm_no(&fragm_hdr, 1);
1162
1163 /* Prepare header of first fragment: */
1164
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001165 buf_chain = buf = tipc_buf_acquire(max_pkt);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001166 if (!buf)
1167 return -ENOMEM;
1168 buf->next = NULL;
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001169 skb_copy_to_linear_data(buf, &fragm_hdr, INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001170 hsz = msg_hdr_sz(hdr);
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001171 skb_copy_to_linear_data_offset(buf, INT_H_SIZE, hdr, hsz);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001172
1173 /* Chop up message: */
1174
1175 fragm_crs = INT_H_SIZE + hsz;
1176 fragm_rest = fragm_sz - hsz;
1177
1178 do { /* For all sections */
1179 u32 sz;
1180
1181 if (!sect_rest) {
1182 sect_rest = msg_sect[++curr_sect].iov_len;
1183 sect_crs = (const unchar *)msg_sect[curr_sect].iov_base;
1184 }
1185
1186 if (sect_rest < fragm_rest)
1187 sz = sect_rest;
1188 else
1189 sz = fragm_rest;
1190
1191 if (likely(!sender->user_port)) {
1192 if (copy_from_user(buf->data + fragm_crs, sect_crs, sz)) {
1193error:
1194 for (; buf_chain; buf_chain = buf) {
1195 buf = buf_chain->next;
1196 buf_discard(buf_chain);
1197 }
1198 return -EFAULT;
1199 }
1200 } else
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001201 skb_copy_to_linear_data_offset(buf, fragm_crs,
1202 sect_crs, sz);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001203 sect_crs += sz;
1204 sect_rest -= sz;
1205 fragm_crs += sz;
1206 fragm_rest -= sz;
1207 rest -= sz;
1208
1209 if (!fragm_rest && rest) {
1210
1211 /* Initiate new fragment: */
1212 if (rest <= fragm_sz) {
1213 fragm_sz = rest;
Allan Stephens0e659672010-12-31 18:59:32 +00001214 msg_set_type(&fragm_hdr, LAST_FRAGMENT);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001215 } else {
1216 msg_set_type(&fragm_hdr, FRAGMENT);
1217 }
1218 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
1219 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
1220 prev = buf;
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001221 buf = tipc_buf_acquire(fragm_sz + INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001222 if (!buf)
1223 goto error;
1224
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001225 buf->next = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001226 prev->next = buf;
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001227 skb_copy_to_linear_data(buf, &fragm_hdr, INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001228 fragm_crs = INT_H_SIZE;
1229 fragm_rest = fragm_sz;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001230 }
Allan Stephens0e659672010-12-31 18:59:32 +00001231 } while (rest > 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001232
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001233 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001234 * Now we have a buffer chain. Select a link and check
1235 * that packet size is still OK
1236 */
Allan Stephens51a8e4d2010-12-31 18:59:18 +00001237 node = tipc_node_find(destaddr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001238 if (likely(node)) {
Per Liden4323add2006-01-18 00:38:21 +01001239 tipc_node_lock(node);
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001240 l_ptr = node->active_links[sender->ref & 1];
Per Lidenb97bf3f2006-01-02 19:04:38 +01001241 if (!l_ptr) {
Per Liden4323add2006-01-18 00:38:21 +01001242 tipc_node_unlock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001243 goto reject;
1244 }
Allan Stephens15e979d2010-05-11 14:30:10 +00001245 if (l_ptr->max_pkt < max_pkt) {
Allan Stephens23dd4cc2011-01-07 11:43:40 -05001246 sender->max_pkt = l_ptr->max_pkt;
Per Liden4323add2006-01-18 00:38:21 +01001247 tipc_node_unlock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001248 for (; buf_chain; buf_chain = buf) {
1249 buf = buf_chain->next;
1250 buf_discard(buf_chain);
1251 }
1252 goto again;
1253 }
1254 } else {
1255reject:
1256 for (; buf_chain; buf_chain = buf) {
1257 buf = buf_chain->next;
1258 buf_discard(buf_chain);
1259 }
Per Liden4323add2006-01-18 00:38:21 +01001260 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
1261 TIPC_ERR_NO_NODE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001262 }
1263
1264 /* Append whole chain to send queue: */
1265
1266 buf = buf_chain;
1267 l_ptr->long_msg_seq_no = mod(l_ptr->long_msg_seq_no + 1);
1268 if (!l_ptr->next_out)
1269 l_ptr->next_out = buf_chain;
1270 l_ptr->stats.sent_fragmented++;
1271 while (buf) {
1272 struct sk_buff *next = buf->next;
1273 struct tipc_msg *msg = buf_msg(buf);
1274
1275 l_ptr->stats.sent_fragments++;
1276 msg_set_long_msgno(msg, l_ptr->long_msg_seq_no);
1277 link_add_to_outqueue(l_ptr, buf, msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001278 buf = next;
1279 }
1280
1281 /* Send it, if possible: */
1282
Per Liden4323add2006-01-18 00:38:21 +01001283 tipc_link_push_queue(l_ptr);
1284 tipc_node_unlock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001285 return dsz;
1286}
1287
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001288/*
Per Liden4323add2006-01-18 00:38:21 +01001289 * tipc_link_push_packet: Push one unsent packet to the media
Per Lidenb97bf3f2006-01-02 19:04:38 +01001290 */
Per Liden4323add2006-01-18 00:38:21 +01001291u32 tipc_link_push_packet(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001292{
1293 struct sk_buff *buf = l_ptr->first_out;
1294 u32 r_q_size = l_ptr->retransm_queue_size;
1295 u32 r_q_head = l_ptr->retransm_queue_head;
1296
1297 /* Step to position where retransmission failed, if any, */
1298 /* consider that buffers may have been released in meantime */
1299
1300 if (r_q_size && buf) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001301 u32 last = lesser(mod(r_q_head + r_q_size),
Per Lidenb97bf3f2006-01-02 19:04:38 +01001302 link_last_sent(l_ptr));
1303 u32 first = msg_seqno(buf_msg(buf));
1304
1305 while (buf && less(first, r_q_head)) {
1306 first = mod(first + 1);
1307 buf = buf->next;
1308 }
1309 l_ptr->retransm_queue_head = r_q_head = first;
1310 l_ptr->retransm_queue_size = r_q_size = mod(last - first);
1311 }
1312
1313 /* Continue retransmission now, if there is anything: */
1314
Neil Hormanca509102010-03-15 07:58:45 +00001315 if (r_q_size && buf) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001316 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001317 msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
Per Liden4323add2006-01-18 00:38:21 +01001318 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001319 l_ptr->retransm_queue_head = mod(++r_q_head);
1320 l_ptr->retransm_queue_size = --r_q_size;
1321 l_ptr->stats.retransmitted++;
Allan Stephens0e35fd52008-07-14 22:44:01 -07001322 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001323 } else {
1324 l_ptr->stats.bearer_congs++;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001325 return PUSH_FAILED;
1326 }
1327 }
1328
1329 /* Send deferred protocol message, if any: */
1330
1331 buf = l_ptr->proto_msg_queue;
1332 if (buf) {
1333 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
Allan Stephens0e659672010-12-31 18:59:32 +00001334 msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
Per Liden4323add2006-01-18 00:38:21 +01001335 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001336 l_ptr->unacked_window = 0;
1337 buf_discard(buf);
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001338 l_ptr->proto_msg_queue = NULL;
Allan Stephens0e35fd52008-07-14 22:44:01 -07001339 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001340 } else {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001341 l_ptr->stats.bearer_congs++;
1342 return PUSH_FAILED;
1343 }
1344 }
1345
1346 /* Send one deferred data message, if send window not full: */
1347
1348 buf = l_ptr->next_out;
1349 if (buf) {
1350 struct tipc_msg *msg = buf_msg(buf);
1351 u32 next = msg_seqno(msg);
1352 u32 first = msg_seqno(buf_msg(l_ptr->first_out));
1353
1354 if (mod(next - first) < l_ptr->queue_limit[0]) {
1355 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001356 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Per Liden4323add2006-01-18 00:38:21 +01001357 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001358 if (msg_user(msg) == MSG_BUNDLER)
1359 msg_set_type(msg, CLOSED_MSG);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001360 l_ptr->next_out = buf->next;
Allan Stephens0e35fd52008-07-14 22:44:01 -07001361 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001362 } else {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001363 l_ptr->stats.bearer_congs++;
1364 return PUSH_FAILED;
1365 }
1366 }
1367 }
1368 return PUSH_FINISHED;
1369}
1370
1371/*
1372 * push_queue(): push out the unsent messages of a link where
1373 * congestion has abated. Node is locked
1374 */
Per Liden4323add2006-01-18 00:38:21 +01001375void tipc_link_push_queue(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001376{
1377 u32 res;
1378
Per Liden4323add2006-01-18 00:38:21 +01001379 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001380 return;
1381
1382 do {
Per Liden4323add2006-01-18 00:38:21 +01001383 res = tipc_link_push_packet(l_ptr);
Allan Stephens0e35fd52008-07-14 22:44:01 -07001384 } while (!res);
1385
Per Lidenb97bf3f2006-01-02 19:04:38 +01001386 if (res == PUSH_FAILED)
Per Liden4323add2006-01-18 00:38:21 +01001387 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001388}
1389
Allan Stephensd356eeb2006-06-25 23:40:01 -07001390static void link_reset_all(unsigned long addr)
1391{
David S. Miller6c000552008-09-02 23:38:32 -07001392 struct tipc_node *n_ptr;
Allan Stephensd356eeb2006-06-25 23:40:01 -07001393 char addr_string[16];
1394 u32 i;
1395
1396 read_lock_bh(&tipc_net_lock);
1397 n_ptr = tipc_node_find((u32)addr);
1398 if (!n_ptr) {
1399 read_unlock_bh(&tipc_net_lock);
1400 return; /* node no longer exists */
1401 }
1402
1403 tipc_node_lock(n_ptr);
1404
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001405 warn("Resetting all links to %s\n",
Allan Stephensc68ca7b2010-05-11 14:30:12 +00001406 tipc_addr_string_fill(addr_string, n_ptr->addr));
Allan Stephensd356eeb2006-06-25 23:40:01 -07001407
1408 for (i = 0; i < MAX_BEARERS; i++) {
1409 if (n_ptr->links[i]) {
Allan Stephens8d64a5b2010-12-31 18:59:27 +00001410 link_print(n_ptr->links[i], "Resetting link\n");
Allan Stephensd356eeb2006-06-25 23:40:01 -07001411 tipc_link_reset(n_ptr->links[i]);
1412 }
1413 }
1414
1415 tipc_node_unlock(n_ptr);
1416 read_unlock_bh(&tipc_net_lock);
1417}
1418
1419static void link_retransmit_failure(struct link *l_ptr, struct sk_buff *buf)
1420{
1421 struct tipc_msg *msg = buf_msg(buf);
1422
1423 warn("Retransmission failure on link <%s>\n", l_ptr->name);
Allan Stephensd356eeb2006-06-25 23:40:01 -07001424
1425 if (l_ptr->addr) {
1426
1427 /* Handle failure on standard link */
1428
Allan Stephens8d64a5b2010-12-31 18:59:27 +00001429 link_print(l_ptr, "Resetting link\n");
Allan Stephensd356eeb2006-06-25 23:40:01 -07001430 tipc_link_reset(l_ptr);
1431
1432 } else {
1433
1434 /* Handle failure on broadcast link */
1435
David S. Miller6c000552008-09-02 23:38:32 -07001436 struct tipc_node *n_ptr;
Allan Stephensd356eeb2006-06-25 23:40:01 -07001437 char addr_string[16];
1438
Allan Stephens8d64a5b2010-12-31 18:59:27 +00001439 info("Msg seq number: %u, ", msg_seqno(msg));
1440 info("Outstanding acks: %lu\n",
1441 (unsigned long) TIPC_SKB_CB(buf)->handle);
Jeff Garzik617dbea2006-10-03 16:25:34 -07001442
Allan Stephens01d83ed2011-01-18 13:53:16 -05001443 n_ptr = tipc_bclink_retransmit_to();
Allan Stephensd356eeb2006-06-25 23:40:01 -07001444 tipc_node_lock(n_ptr);
1445
Allan Stephensc68ca7b2010-05-11 14:30:12 +00001446 tipc_addr_string_fill(addr_string, n_ptr->addr);
Allan Stephens8d64a5b2010-12-31 18:59:27 +00001447 info("Multicast link info for %s\n", addr_string);
1448 info("Supported: %d, ", n_ptr->bclink.supported);
1449 info("Acked: %u\n", n_ptr->bclink.acked);
1450 info("Last in: %u, ", n_ptr->bclink.last_in);
1451 info("Gap after: %u, ", n_ptr->bclink.gap_after);
1452 info("Gap to: %u\n", n_ptr->bclink.gap_to);
1453 info("Nack sync: %u\n\n", n_ptr->bclink.nack_sync);
Allan Stephensd356eeb2006-06-25 23:40:01 -07001454
1455 tipc_k_signal((Handler)link_reset_all, (unsigned long)n_ptr->addr);
1456
1457 tipc_node_unlock(n_ptr);
1458
1459 l_ptr->stale_count = 0;
1460 }
1461}
1462
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001463void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *buf,
Per Liden4323add2006-01-18 00:38:21 +01001464 u32 retransmits)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001465{
1466 struct tipc_msg *msg;
1467
Allan Stephensd356eeb2006-06-25 23:40:01 -07001468 if (!buf)
1469 return;
1470
1471 msg = buf_msg(buf);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001472
Allan Stephensd356eeb2006-06-25 23:40:01 -07001473 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
Neil Hormanca509102010-03-15 07:58:45 +00001474 if (l_ptr->retransm_queue_size == 0) {
Allan Stephensd356eeb2006-06-25 23:40:01 -07001475 l_ptr->retransm_queue_head = msg_seqno(msg);
1476 l_ptr->retransm_queue_size = retransmits;
Allan Stephensd356eeb2006-06-25 23:40:01 -07001477 } else {
Neil Hormanca509102010-03-15 07:58:45 +00001478 err("Unexpected retransmit on link %s (qsize=%d)\n",
1479 l_ptr->name, l_ptr->retransm_queue_size);
Allan Stephensd356eeb2006-06-25 23:40:01 -07001480 }
Neil Hormanca509102010-03-15 07:58:45 +00001481 return;
Allan Stephensd356eeb2006-06-25 23:40:01 -07001482 } else {
1483 /* Detect repeated retransmit failures on uncongested bearer */
1484
1485 if (l_ptr->last_retransmitted == msg_seqno(msg)) {
1486 if (++l_ptr->stale_count > 100) {
1487 link_retransmit_failure(l_ptr, buf);
1488 return;
1489 }
1490 } else {
1491 l_ptr->last_retransmitted = msg_seqno(msg);
1492 l_ptr->stale_count = 1;
1493 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001494 }
Allan Stephensd356eeb2006-06-25 23:40:01 -07001495
Neil Hormanca509102010-03-15 07:58:45 +00001496 while (retransmits && (buf != l_ptr->next_out) && buf) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001497 msg = buf_msg(buf);
1498 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001499 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Per Liden4323add2006-01-18 00:38:21 +01001500 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001501 buf = buf->next;
1502 retransmits--;
1503 l_ptr->stats.retransmitted++;
1504 } else {
Per Liden4323add2006-01-18 00:38:21 +01001505 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001506 l_ptr->stats.bearer_congs++;
1507 l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
1508 l_ptr->retransm_queue_size = retransmits;
1509 return;
1510 }
1511 }
Allan Stephensd356eeb2006-06-25 23:40:01 -07001512
Per Lidenb97bf3f2006-01-02 19:04:38 +01001513 l_ptr->retransm_queue_head = l_ptr->retransm_queue_size = 0;
1514}
1515
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001516/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001517 * link_insert_deferred_queue - insert deferred messages back into receive chain
1518 */
1519
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001520static struct sk_buff *link_insert_deferred_queue(struct link *l_ptr,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001521 struct sk_buff *buf)
1522{
1523 u32 seq_no;
1524
1525 if (l_ptr->oldest_deferred_in == NULL)
1526 return buf;
1527
1528 seq_no = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1529 if (seq_no == mod(l_ptr->next_in_no)) {
1530 l_ptr->newest_deferred_in->next = buf;
1531 buf = l_ptr->oldest_deferred_in;
1532 l_ptr->oldest_deferred_in = NULL;
1533 l_ptr->deferred_inqueue_sz = 0;
1534 }
1535 return buf;
1536}
1537
Allan Stephens85035562008-04-15 19:04:54 -07001538/**
1539 * link_recv_buf_validate - validate basic format of received message
1540 *
1541 * This routine ensures a TIPC message has an acceptable header, and at least
1542 * as much data as the header indicates it should. The routine also ensures
1543 * that the entire message header is stored in the main fragment of the message
1544 * buffer, to simplify future access to message header fields.
1545 *
1546 * Note: Having extra info present in the message header or data areas is OK.
1547 * TIPC will ignore the excess, under the assumption that it is optional info
1548 * introduced by a later release of the protocol.
1549 */
1550
1551static int link_recv_buf_validate(struct sk_buff *buf)
1552{
1553 static u32 min_data_hdr_size[8] = {
1554 SHORT_H_SIZE, MCAST_H_SIZE, LONG_H_SIZE, DIR_MSG_H_SIZE,
1555 MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE
1556 };
1557
1558 struct tipc_msg *msg;
1559 u32 tipc_hdr[2];
1560 u32 size;
1561 u32 hdr_size;
1562 u32 min_hdr_size;
1563
1564 if (unlikely(buf->len < MIN_H_SIZE))
1565 return 0;
1566
1567 msg = skb_header_pointer(buf, 0, sizeof(tipc_hdr), tipc_hdr);
1568 if (msg == NULL)
1569 return 0;
1570
1571 if (unlikely(msg_version(msg) != TIPC_VERSION))
1572 return 0;
1573
1574 size = msg_size(msg);
1575 hdr_size = msg_hdr_sz(msg);
1576 min_hdr_size = msg_isdata(msg) ?
1577 min_data_hdr_size[msg_type(msg)] : INT_H_SIZE;
1578
1579 if (unlikely((hdr_size < min_hdr_size) ||
1580 (size < hdr_size) ||
1581 (buf->len < size) ||
1582 (size - hdr_size > TIPC_MAX_USER_MSG_SIZE)))
1583 return 0;
1584
1585 return pskb_may_pull(buf, hdr_size);
1586}
1587
Allan Stephensb02b69c2010-08-17 11:00:07 +00001588/**
1589 * tipc_recv_msg - process TIPC messages arriving from off-node
1590 * @head: pointer to message buffer chain
1591 * @tb_ptr: pointer to bearer message arrived on
1592 *
1593 * Invoked with no locks held. Bearer pointer must point to a valid bearer
1594 * structure (i.e. cannot be NULL), but bearer can be inactive.
1595 */
1596
Allan Stephens2d627b92011-01-07 13:00:11 -05001597void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001598{
Per Liden4323add2006-01-18 00:38:21 +01001599 read_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001600 while (head) {
David S. Miller6c000552008-09-02 23:38:32 -07001601 struct tipc_node *n_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001602 struct link *l_ptr;
1603 struct sk_buff *crs;
1604 struct sk_buff *buf = head;
Allan Stephens85035562008-04-15 19:04:54 -07001605 struct tipc_msg *msg;
1606 u32 seq_no;
1607 u32 ackd;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001608 u32 released = 0;
1609 int type;
1610
Per Lidenb97bf3f2006-01-02 19:04:38 +01001611 head = head->next;
Allan Stephens85035562008-04-15 19:04:54 -07001612
Allan Stephensb02b69c2010-08-17 11:00:07 +00001613 /* Ensure bearer is still enabled */
1614
1615 if (unlikely(!b_ptr->active))
1616 goto cont;
1617
Allan Stephens85035562008-04-15 19:04:54 -07001618 /* Ensure message is well-formed */
1619
1620 if (unlikely(!link_recv_buf_validate(buf)))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001621 goto cont;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001622
Allan Stephensfe13dda2008-04-15 19:03:23 -07001623 /* Ensure message data is a single contiguous unit */
1624
Allan Stephensa0168922010-12-31 18:59:35 +00001625 if (unlikely(buf_linearize(buf)))
Allan Stephensfe13dda2008-04-15 19:03:23 -07001626 goto cont;
Allan Stephensfe13dda2008-04-15 19:03:23 -07001627
Allan Stephens85035562008-04-15 19:04:54 -07001628 /* Handle arrival of a non-unicast link message */
1629
1630 msg = buf_msg(buf);
1631
Per Lidenb97bf3f2006-01-02 19:04:38 +01001632 if (unlikely(msg_non_seq(msg))) {
Allan Stephens1265a022008-06-04 17:32:35 -07001633 if (msg_user(msg) == LINK_CONFIG)
1634 tipc_disc_recv_msg(buf, b_ptr);
1635 else
1636 tipc_bclink_recv_pkt(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001637 continue;
1638 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001639
Allan Stephens26008242006-06-25 23:39:31 -07001640 if (unlikely(!msg_short(msg) &&
1641 (msg_destnode(msg) != tipc_own_addr)))
1642 goto cont;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001643
Neil Hormande586572010-03-08 12:43:56 -08001644 /* Discard non-routeable messages destined for another node */
1645
1646 if (unlikely(!msg_isdata(msg) &&
1647 (msg_destnode(msg) != tipc_own_addr))) {
1648 if ((msg_user(msg) != CONN_MANAGER) &&
1649 (msg_user(msg) != MSG_FRAGMENTER))
1650 goto cont;
1651 }
1652
Allan Stephens5a68d5ee2010-08-17 11:00:16 +00001653 /* Locate neighboring node that sent message */
Allan Stephens85035562008-04-15 19:04:54 -07001654
Per Liden4323add2006-01-18 00:38:21 +01001655 n_ptr = tipc_node_find(msg_prevnode(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001656 if (unlikely(!n_ptr))
1657 goto cont;
Per Liden4323add2006-01-18 00:38:21 +01001658 tipc_node_lock(n_ptr);
Allan Stephens85035562008-04-15 19:04:54 -07001659
Allan Stephens5a68d5ee2010-08-17 11:00:16 +00001660 /* Don't talk to neighbor during cleanup after last session */
1661
1662 if (n_ptr->cleanup_required) {
1663 tipc_node_unlock(n_ptr);
1664 goto cont;
1665 }
1666
1667 /* Locate unicast link endpoint that should handle message */
1668
Per Lidenb97bf3f2006-01-02 19:04:38 +01001669 l_ptr = n_ptr->links[b_ptr->identity];
1670 if (unlikely(!l_ptr)) {
Per Liden4323add2006-01-18 00:38:21 +01001671 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001672 goto cont;
1673 }
Allan Stephens85035562008-04-15 19:04:54 -07001674
1675 /* Validate message sequence number info */
1676
1677 seq_no = msg_seqno(msg);
1678 ackd = msg_ack(msg);
1679
1680 /* Release acked messages */
1681
Per Lidenb97bf3f2006-01-02 19:04:38 +01001682 if (less(n_ptr->bclink.acked, msg_bcast_ack(msg))) {
Per Liden4323add2006-01-18 00:38:21 +01001683 if (tipc_node_is_up(n_ptr) && n_ptr->bclink.supported)
1684 tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001685 }
1686
1687 crs = l_ptr->first_out;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001688 while ((crs != l_ptr->next_out) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01001689 less_eq(msg_seqno(buf_msg(crs)), ackd)) {
1690 struct sk_buff *next = crs->next;
1691
1692 buf_discard(crs);
1693 crs = next;
1694 released++;
1695 }
1696 if (released) {
1697 l_ptr->first_out = crs;
1698 l_ptr->out_queue_size -= released;
1699 }
Allan Stephens85035562008-04-15 19:04:54 -07001700
1701 /* Try sending any messages link endpoint has pending */
1702
Per Lidenb97bf3f2006-01-02 19:04:38 +01001703 if (unlikely(l_ptr->next_out))
Per Liden4323add2006-01-18 00:38:21 +01001704 tipc_link_push_queue(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001705 if (unlikely(!list_empty(&l_ptr->waiting_ports)))
Per Liden4323add2006-01-18 00:38:21 +01001706 tipc_link_wakeup_ports(l_ptr, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001707 if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
1708 l_ptr->stats.sent_acks++;
Per Liden4323add2006-01-18 00:38:21 +01001709 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001710 }
1711
Allan Stephens85035562008-04-15 19:04:54 -07001712 /* Now (finally!) process the incoming message */
1713
Per Lidenb97bf3f2006-01-02 19:04:38 +01001714protocol_check:
1715 if (likely(link_working_working(l_ptr))) {
1716 if (likely(seq_no == mod(l_ptr->next_in_no))) {
1717 l_ptr->next_in_no++;
1718 if (unlikely(l_ptr->oldest_deferred_in))
1719 head = link_insert_deferred_queue(l_ptr,
1720 head);
1721 if (likely(msg_is_dest(msg, tipc_own_addr))) {
1722deliver:
1723 if (likely(msg_isdata(msg))) {
Per Liden4323add2006-01-18 00:38:21 +01001724 tipc_node_unlock(n_ptr);
1725 tipc_port_recv_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001726 continue;
1727 }
1728 switch (msg_user(msg)) {
1729 case MSG_BUNDLER:
1730 l_ptr->stats.recv_bundles++;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001731 l_ptr->stats.recv_bundled +=
Per Lidenb97bf3f2006-01-02 19:04:38 +01001732 msg_msgcnt(msg);
Per Liden4323add2006-01-18 00:38:21 +01001733 tipc_node_unlock(n_ptr);
1734 tipc_link_recv_bundle(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001735 continue;
1736 case ROUTE_DISTRIBUTOR:
Per Liden4323add2006-01-18 00:38:21 +01001737 tipc_node_unlock(n_ptr);
Allan Stephens51a8e4d2010-12-31 18:59:18 +00001738 buf_discard(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001739 continue;
1740 case NAME_DISTRIBUTOR:
Per Liden4323add2006-01-18 00:38:21 +01001741 tipc_node_unlock(n_ptr);
1742 tipc_named_recv(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001743 continue;
1744 case CONN_MANAGER:
Per Liden4323add2006-01-18 00:38:21 +01001745 tipc_node_unlock(n_ptr);
1746 tipc_port_recv_proto_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001747 continue;
1748 case MSG_FRAGMENTER:
1749 l_ptr->stats.recv_fragments++;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001750 if (tipc_link_recv_fragment(&l_ptr->defragm_buf,
Per Liden4323add2006-01-18 00:38:21 +01001751 &buf, &msg)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001752 l_ptr->stats.recv_fragmented++;
1753 goto deliver;
1754 }
1755 break;
1756 case CHANGEOVER_PROTOCOL:
1757 type = msg_type(msg);
Per Liden4323add2006-01-18 00:38:21 +01001758 if (link_recv_changeover_msg(&l_ptr, &buf)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001759 msg = buf_msg(buf);
1760 seq_no = msg_seqno(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001761 if (type == ORIGINAL_MSG)
1762 goto deliver;
1763 goto protocol_check;
1764 }
1765 break;
1766 }
1767 }
Per Liden4323add2006-01-18 00:38:21 +01001768 tipc_node_unlock(n_ptr);
1769 tipc_net_route_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001770 continue;
1771 }
1772 link_handle_out_of_seq_msg(l_ptr, buf);
1773 head = link_insert_deferred_queue(l_ptr, head);
Per Liden4323add2006-01-18 00:38:21 +01001774 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001775 continue;
1776 }
1777
1778 if (msg_user(msg) == LINK_PROTOCOL) {
1779 link_recv_proto_msg(l_ptr, buf);
1780 head = link_insert_deferred_queue(l_ptr, head);
Per Liden4323add2006-01-18 00:38:21 +01001781 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001782 continue;
1783 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001784 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1785
1786 if (link_working_working(l_ptr)) {
1787 /* Re-insert in front of queue */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001788 buf->next = head;
1789 head = buf;
Per Liden4323add2006-01-18 00:38:21 +01001790 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001791 continue;
1792 }
Per Liden4323add2006-01-18 00:38:21 +01001793 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001794cont:
1795 buf_discard(buf);
1796 }
Per Liden4323add2006-01-18 00:38:21 +01001797 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001798}
1799
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001800/*
1801 * link_defer_buf(): Sort a received out-of-sequence packet
Per Lidenb97bf3f2006-01-02 19:04:38 +01001802 * into the deferred reception queue.
1803 * Returns the increase of the queue length,i.e. 0 or 1
1804 */
1805
Per Liden4323add2006-01-18 00:38:21 +01001806u32 tipc_link_defer_pkt(struct sk_buff **head,
1807 struct sk_buff **tail,
1808 struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001809{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001810 struct sk_buff *prev = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001811 struct sk_buff *crs = *head;
1812 u32 seq_no = msg_seqno(buf_msg(buf));
1813
1814 buf->next = NULL;
1815
1816 /* Empty queue ? */
1817 if (*head == NULL) {
1818 *head = *tail = buf;
1819 return 1;
1820 }
1821
1822 /* Last ? */
1823 if (less(msg_seqno(buf_msg(*tail)), seq_no)) {
1824 (*tail)->next = buf;
1825 *tail = buf;
1826 return 1;
1827 }
1828
1829 /* Scan through queue and sort it in */
1830 do {
1831 struct tipc_msg *msg = buf_msg(crs);
1832
1833 if (less(seq_no, msg_seqno(msg))) {
1834 buf->next = crs;
1835 if (prev)
1836 prev->next = buf;
1837 else
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001838 *head = buf;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001839 return 1;
1840 }
Allan Stephensa0168922010-12-31 18:59:35 +00001841 if (seq_no == msg_seqno(msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001842 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001843 prev = crs;
1844 crs = crs->next;
Allan Stephens0e659672010-12-31 18:59:32 +00001845 } while (crs);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001846
1847 /* Message is a duplicate of an existing message */
1848
1849 buf_discard(buf);
1850 return 0;
1851}
1852
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001853/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001854 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
1855 */
1856
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001857static void link_handle_out_of_seq_msg(struct link *l_ptr,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001858 struct sk_buff *buf)
1859{
1860 u32 seq_no = msg_seqno(buf_msg(buf));
1861
1862 if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
1863 link_recv_proto_msg(l_ptr, buf);
1864 return;
1865 }
1866
Per Lidenb97bf3f2006-01-02 19:04:38 +01001867 /* Record OOS packet arrival (force mismatch on next timeout) */
1868
1869 l_ptr->checkpoint--;
1870
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001871 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001872 * Discard packet if a duplicate; otherwise add it to deferred queue
1873 * and notify peer of gap as per protocol specification
1874 */
1875
1876 if (less(seq_no, mod(l_ptr->next_in_no))) {
1877 l_ptr->stats.duplicates++;
1878 buf_discard(buf);
1879 return;
1880 }
1881
Per Liden4323add2006-01-18 00:38:21 +01001882 if (tipc_link_defer_pkt(&l_ptr->oldest_deferred_in,
1883 &l_ptr->newest_deferred_in, buf)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001884 l_ptr->deferred_inqueue_sz++;
1885 l_ptr->stats.deferred_recv++;
1886 if ((l_ptr->deferred_inqueue_sz % 16) == 1)
Per Liden4323add2006-01-18 00:38:21 +01001887 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001888 } else
1889 l_ptr->stats.duplicates++;
1890}
1891
1892/*
1893 * Send protocol message to the other endpoint.
1894 */
Per Liden4323add2006-01-18 00:38:21 +01001895void tipc_link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int probe_msg,
1896 u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001897{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001898 struct sk_buff *buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001899 struct tipc_msg *msg = l_ptr->pmsg;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001900 u32 msg_size = sizeof(l_ptr->proto_msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001901
1902 if (link_blocked(l_ptr))
1903 return;
1904 msg_set_type(msg, msg_typ);
1905 msg_set_net_plane(msg, l_ptr->b_ptr->net_plane);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001906 msg_set_bcast_ack(msg, mod(l_ptr->owner->bclink.last_in));
Per Liden4323add2006-01-18 00:38:21 +01001907 msg_set_last_bcast(msg, tipc_bclink_get_last_sent());
Per Lidenb97bf3f2006-01-02 19:04:38 +01001908
1909 if (msg_typ == STATE_MSG) {
1910 u32 next_sent = mod(l_ptr->next_out_no);
1911
Per Liden4323add2006-01-18 00:38:21 +01001912 if (!tipc_link_is_up(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001913 return;
1914 if (l_ptr->next_out)
1915 next_sent = msg_seqno(buf_msg(l_ptr->next_out));
1916 msg_set_next_sent(msg, next_sent);
1917 if (l_ptr->oldest_deferred_in) {
1918 u32 rec = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1919 gap = mod(rec - mod(l_ptr->next_in_no));
1920 }
1921 msg_set_seq_gap(msg, gap);
1922 if (gap)
1923 l_ptr->stats.sent_nacks++;
1924 msg_set_link_tolerance(msg, tolerance);
1925 msg_set_linkprio(msg, priority);
1926 msg_set_max_pkt(msg, ack_mtu);
1927 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1928 msg_set_probe(msg, probe_msg != 0);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001929 if (probe_msg) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001930 u32 mtu = l_ptr->max_pkt;
1931
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001932 if ((mtu < l_ptr->max_pkt_target) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01001933 link_working_working(l_ptr) &&
1934 l_ptr->fsm_msg_cnt) {
1935 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001936 if (l_ptr->max_pkt_probes == 10) {
1937 l_ptr->max_pkt_target = (msg_size - 4);
1938 l_ptr->max_pkt_probes = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001939 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001940 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001941 l_ptr->max_pkt_probes++;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001942 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001943
1944 l_ptr->stats.sent_probes++;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001945 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001946 l_ptr->stats.sent_states++;
1947 } else { /* RESET_MSG or ACTIVATE_MSG */
1948 msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1));
1949 msg_set_seq_gap(msg, 0);
1950 msg_set_next_sent(msg, 1);
Allan Stephensf23d9bf2011-01-18 15:15:34 -05001951 msg_set_probe(msg, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001952 msg_set_link_tolerance(msg, l_ptr->tolerance);
1953 msg_set_linkprio(msg, l_ptr->priority);
1954 msg_set_max_pkt(msg, l_ptr->max_pkt_target);
1955 }
1956
Allan Stephens77f167f2011-02-28 15:30:20 -05001957 msg_set_redundant_link(msg, tipc_node_redundant_links(l_ptr->owner));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001958 msg_set_linkprio(msg, l_ptr->priority);
1959
1960 /* Ensure sequence number will not fit : */
1961
1962 msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
1963
1964 /* Congestion? */
1965
Per Liden4323add2006-01-18 00:38:21 +01001966 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001967 if (!l_ptr->proto_msg_queue) {
1968 l_ptr->proto_msg_queue =
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001969 tipc_buf_acquire(sizeof(l_ptr->proto_msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001970 }
1971 buf = l_ptr->proto_msg_queue;
1972 if (!buf)
1973 return;
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001974 skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001975 return;
1976 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001977
1978 /* Message can be sent */
1979
stephen hemminger31e3c3f2010-10-13 13:20:35 +00001980 buf = tipc_buf_acquire(msg_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001981 if (!buf)
1982 return;
1983
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03001984 skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001985 msg_set_size(buf_msg(buf), msg_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001986
Per Liden4323add2006-01-18 00:38:21 +01001987 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001988 l_ptr->unacked_window = 0;
1989 buf_discard(buf);
1990 return;
1991 }
1992
1993 /* New congestion */
Per Liden4323add2006-01-18 00:38:21 +01001994 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001995 l_ptr->proto_msg_queue = buf;
1996 l_ptr->stats.bearer_congs++;
1997}
1998
1999/*
2000 * Receive protocol message :
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002001 * Note that network plane id propagates through the network, and may
2002 * change at any time. The node with lowest address rules
Per Lidenb97bf3f2006-01-02 19:04:38 +01002003 */
2004
2005static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf)
2006{
2007 u32 rec_gap = 0;
2008 u32 max_pkt_info;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002009 u32 max_pkt_ack;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002010 u32 msg_tol;
2011 struct tipc_msg *msg = buf_msg(buf);
2012
Per Lidenb97bf3f2006-01-02 19:04:38 +01002013 if (link_blocked(l_ptr))
2014 goto exit;
2015
2016 /* record unnumbered packet arrival (force mismatch on next timeout) */
2017
2018 l_ptr->checkpoint--;
2019
2020 if (l_ptr->b_ptr->net_plane != msg_net_plane(msg))
2021 if (tipc_own_addr > msg_prevnode(msg))
2022 l_ptr->b_ptr->net_plane = msg_net_plane(msg);
2023
2024 l_ptr->owner->permit_changeover = msg_redundant_link(msg);
2025
2026 switch (msg_type(msg)) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002027
Per Lidenb97bf3f2006-01-02 19:04:38 +01002028 case RESET_MSG:
Allan Stephensa686e682008-06-04 17:29:39 -07002029 if (!link_working_unknown(l_ptr) &&
2030 (l_ptr->peer_session != INVALID_SESSION)) {
Allan Stephensb29f1422010-12-31 18:59:25 +00002031 if (msg_session(msg) == l_ptr->peer_session)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002032 break; /* duplicate: ignore */
Per Lidenb97bf3f2006-01-02 19:04:38 +01002033 }
2034 /* fall thru' */
2035 case ACTIVATE_MSG:
2036 /* Update link settings according other endpoint's values */
2037
2038 strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
2039
Allan Stephens2db99832010-12-31 18:59:33 +00002040 msg_tol = msg_link_tolerance(msg);
2041 if (msg_tol > l_ptr->tolerance)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002042 link_set_supervision_props(l_ptr, msg_tol);
2043
2044 if (msg_linkprio(msg) > l_ptr->priority)
2045 l_ptr->priority = msg_linkprio(msg);
2046
2047 max_pkt_info = msg_max_pkt(msg);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002048 if (max_pkt_info) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002049 if (max_pkt_info < l_ptr->max_pkt_target)
2050 l_ptr->max_pkt_target = max_pkt_info;
2051 if (l_ptr->max_pkt > l_ptr->max_pkt_target)
2052 l_ptr->max_pkt = l_ptr->max_pkt_target;
2053 } else {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002054 l_ptr->max_pkt = l_ptr->max_pkt_target;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002055 }
2056 l_ptr->owner->bclink.supported = (max_pkt_info != 0);
2057
2058 link_state_event(l_ptr, msg_type(msg));
2059
2060 l_ptr->peer_session = msg_session(msg);
2061 l_ptr->peer_bearer_id = msg_bearer_id(msg);
2062
2063 /* Synchronize broadcast sequence numbers */
Paul Gortmaker8f19afb2011-02-28 11:36:21 -04002064 if (!tipc_node_redundant_links(l_ptr->owner))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002065 l_ptr->owner->bclink.last_in = mod(msg_last_bcast(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002066 break;
2067 case STATE_MSG:
2068
Allan Stephens2db99832010-12-31 18:59:33 +00002069 msg_tol = msg_link_tolerance(msg);
2070 if (msg_tol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002071 link_set_supervision_props(l_ptr, msg_tol);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002072
2073 if (msg_linkprio(msg) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01002074 (msg_linkprio(msg) != l_ptr->priority)) {
Allan Stephensa10bd922006-06-25 23:52:17 -07002075 warn("Resetting link <%s>, priority change %u->%u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +01002076 l_ptr->name, l_ptr->priority, msg_linkprio(msg));
2077 l_ptr->priority = msg_linkprio(msg);
Per Liden4323add2006-01-18 00:38:21 +01002078 tipc_link_reset(l_ptr); /* Enforce change to take effect */
Per Lidenb97bf3f2006-01-02 19:04:38 +01002079 break;
2080 }
2081 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
2082 l_ptr->stats.recv_states++;
2083 if (link_reset_unknown(l_ptr))
2084 break;
2085
2086 if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002087 rec_gap = mod(msg_next_sent(msg) -
Per Lidenb97bf3f2006-01-02 19:04:38 +01002088 mod(l_ptr->next_in_no));
2089 }
2090
2091 max_pkt_ack = msg_max_pkt(msg);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002092 if (max_pkt_ack > l_ptr->max_pkt) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002093 l_ptr->max_pkt = max_pkt_ack;
2094 l_ptr->max_pkt_probes = 0;
2095 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002096
2097 max_pkt_ack = 0;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002098 if (msg_probe(msg)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002099 l_ptr->stats.recv_probes++;
Allan Stephensa0168922010-12-31 18:59:35 +00002100 if (msg_size(msg) > sizeof(l_ptr->proto_msg))
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002101 max_pkt_ack = msg_size(msg);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002102 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002103
2104 /* Protocol message before retransmits, reduce loss risk */
2105
Per Liden4323add2006-01-18 00:38:21 +01002106 tipc_bclink_check_gap(l_ptr->owner, msg_last_bcast(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002107
2108 if (rec_gap || (msg_probe(msg))) {
Per Liden4323add2006-01-18 00:38:21 +01002109 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2110 0, rec_gap, 0, 0, max_pkt_ack);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002111 }
2112 if (msg_seq_gap(msg)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002113 l_ptr->stats.recv_nacks++;
Per Liden4323add2006-01-18 00:38:21 +01002114 tipc_link_retransmit(l_ptr, l_ptr->first_out,
2115 msg_seq_gap(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002116 }
2117 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002118 }
2119exit:
2120 buf_discard(buf);
2121}
2122
2123
2124/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002125 * tipc_link_tunnel(): Send one message via a link belonging to
Per Lidenb97bf3f2006-01-02 19:04:38 +01002126 * another bearer. Owner node is locked.
2127 */
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002128static void tipc_link_tunnel(struct link *l_ptr,
2129 struct tipc_msg *tunnel_hdr,
2130 struct tipc_msg *msg,
2131 u32 selector)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002132{
2133 struct link *tunnel;
2134 struct sk_buff *buf;
2135 u32 length = msg_size(msg);
2136
2137 tunnel = l_ptr->owner->active_links[selector & 1];
Allan Stephens5392d642006-06-25 23:52:50 -07002138 if (!tipc_link_is_up(tunnel)) {
2139 warn("Link changeover error, "
2140 "tunnel link no longer available\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002141 return;
Allan Stephens5392d642006-06-25 23:52:50 -07002142 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002143 msg_set_size(tunnel_hdr, length + INT_H_SIZE);
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002144 buf = tipc_buf_acquire(length + INT_H_SIZE);
Allan Stephens5392d642006-06-25 23:52:50 -07002145 if (!buf) {
2146 warn("Link changeover error, "
2147 "unable to send tunnel msg\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002148 return;
Allan Stephens5392d642006-06-25 23:52:50 -07002149 }
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002150 skb_copy_to_linear_data(buf, tunnel_hdr, INT_H_SIZE);
2151 skb_copy_to_linear_data_offset(buf, INT_H_SIZE, msg, length);
Per Liden4323add2006-01-18 00:38:21 +01002152 tipc_link_send_buf(tunnel, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002153}
2154
2155
2156
2157/*
2158 * changeover(): Send whole message queue via the remaining link
2159 * Owner node is locked.
2160 */
2161
Per Liden4323add2006-01-18 00:38:21 +01002162void tipc_link_changeover(struct link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002163{
2164 u32 msgcount = l_ptr->out_queue_size;
2165 struct sk_buff *crs = l_ptr->first_out;
2166 struct link *tunnel = l_ptr->owner->active_links[0];
Per Lidenb97bf3f2006-01-02 19:04:38 +01002167 struct tipc_msg tunnel_hdr;
Allan Stephens5392d642006-06-25 23:52:50 -07002168 int split_bundles;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002169
2170 if (!tunnel)
2171 return;
2172
Allan Stephens5392d642006-06-25 23:52:50 -07002173 if (!l_ptr->owner->permit_changeover) {
2174 warn("Link changeover error, "
2175 "peer did not permit changeover\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002176 return;
Allan Stephens5392d642006-06-25 23:52:50 -07002177 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002178
Allan Stephensc68ca7b2010-05-11 14:30:12 +00002179 tipc_msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
Allan Stephens75715212008-06-04 17:37:34 -07002180 ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002181 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2182 msg_set_msgcnt(&tunnel_hdr, msgcount);
Allan Stephensf1310722006-06-25 23:51:37 -07002183
Per Lidenb97bf3f2006-01-02 19:04:38 +01002184 if (!l_ptr->first_out) {
2185 struct sk_buff *buf;
2186
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002187 buf = tipc_buf_acquire(INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002188 if (buf) {
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002189 skb_copy_to_linear_data(buf, &tunnel_hdr, INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002190 msg_set_size(&tunnel_hdr, INT_H_SIZE);
Per Liden4323add2006-01-18 00:38:21 +01002191 tipc_link_send_buf(tunnel, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002192 } else {
Allan Stephensa10bd922006-06-25 23:52:17 -07002193 warn("Link changeover error, "
2194 "unable to send changeover msg\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002195 }
2196 return;
2197 }
Allan Stephensf1310722006-06-25 23:51:37 -07002198
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002199 split_bundles = (l_ptr->owner->active_links[0] !=
Allan Stephens5392d642006-06-25 23:52:50 -07002200 l_ptr->owner->active_links[1]);
2201
Per Lidenb97bf3f2006-01-02 19:04:38 +01002202 while (crs) {
2203 struct tipc_msg *msg = buf_msg(crs);
2204
2205 if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002206 struct tipc_msg *m = msg_get_wrapped(msg);
Allan Stephens0e659672010-12-31 18:59:32 +00002207 unchar *pos = (unchar *)m;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002208
Florian Westphald788d802007-08-02 19:28:06 -07002209 msgcount = msg_msgcnt(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002210 while (msgcount--) {
Allan Stephens0e659672010-12-31 18:59:32 +00002211 msg_set_seqno(m, msg_seqno(msg));
Per Liden4323add2006-01-18 00:38:21 +01002212 tipc_link_tunnel(l_ptr, &tunnel_hdr, m,
2213 msg_link_selector(m));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002214 pos += align(msg_size(m));
2215 m = (struct tipc_msg *)pos;
2216 }
2217 } else {
Per Liden4323add2006-01-18 00:38:21 +01002218 tipc_link_tunnel(l_ptr, &tunnel_hdr, msg,
2219 msg_link_selector(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002220 }
2221 crs = crs->next;
2222 }
2223}
2224
Per Liden4323add2006-01-18 00:38:21 +01002225void tipc_link_send_duplicate(struct link *l_ptr, struct link *tunnel)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002226{
2227 struct sk_buff *iter;
2228 struct tipc_msg tunnel_hdr;
2229
Allan Stephensc68ca7b2010-05-11 14:30:12 +00002230 tipc_msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
Allan Stephens75715212008-06-04 17:37:34 -07002231 DUPLICATE_MSG, INT_H_SIZE, l_ptr->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002232 msg_set_msgcnt(&tunnel_hdr, l_ptr->out_queue_size);
2233 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2234 iter = l_ptr->first_out;
2235 while (iter) {
2236 struct sk_buff *outbuf;
2237 struct tipc_msg *msg = buf_msg(iter);
2238 u32 length = msg_size(msg);
2239
2240 if (msg_user(msg) == MSG_BUNDLER)
2241 msg_set_type(msg, CLOSED_MSG);
2242 msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002243 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002244 msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002245 outbuf = tipc_buf_acquire(length + INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002246 if (outbuf == NULL) {
Allan Stephensa10bd922006-06-25 23:52:17 -07002247 warn("Link changeover error, "
2248 "unable to send duplicate msg\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002249 return;
2250 }
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002251 skb_copy_to_linear_data(outbuf, &tunnel_hdr, INT_H_SIZE);
2252 skb_copy_to_linear_data_offset(outbuf, INT_H_SIZE, iter->data,
2253 length);
Per Liden4323add2006-01-18 00:38:21 +01002254 tipc_link_send_buf(tunnel, outbuf);
2255 if (!tipc_link_is_up(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002256 return;
2257 iter = iter->next;
2258 }
2259}
2260
2261
2262
2263/**
2264 * buf_extract - extracts embedded TIPC message from another message
2265 * @skb: encapsulating message buffer
2266 * @from_pos: offset to extract from
2267 *
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002268 * Returns a new message buffer containing an embedded message. The
Per Lidenb97bf3f2006-01-02 19:04:38 +01002269 * encapsulating message itself is left unchanged.
2270 */
2271
2272static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)
2273{
2274 struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos);
2275 u32 size = msg_size(msg);
2276 struct sk_buff *eb;
2277
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002278 eb = tipc_buf_acquire(size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002279 if (eb)
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002280 skb_copy_to_linear_data(eb, msg, size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002281 return eb;
2282}
2283
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002284/*
Per Lidenb97bf3f2006-01-02 19:04:38 +01002285 * link_recv_changeover_msg(): Receive tunneled packet sent
2286 * via other link. Node is locked. Return extracted buffer.
2287 */
2288
2289static int link_recv_changeover_msg(struct link **l_ptr,
2290 struct sk_buff **buf)
2291{
2292 struct sk_buff *tunnel_buf = *buf;
2293 struct link *dest_link;
2294 struct tipc_msg *msg;
2295 struct tipc_msg *tunnel_msg = buf_msg(tunnel_buf);
2296 u32 msg_typ = msg_type(tunnel_msg);
2297 u32 msg_count = msg_msgcnt(tunnel_msg);
2298
2299 dest_link = (*l_ptr)->owner->links[msg_bearer_id(tunnel_msg)];
Allan Stephensb29f1422010-12-31 18:59:25 +00002300 if (!dest_link)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002301 goto exit;
Allan Stephensf1310722006-06-25 23:51:37 -07002302 if (dest_link == *l_ptr) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002303 err("Unexpected changeover message on link <%s>\n",
Allan Stephensf1310722006-06-25 23:51:37 -07002304 (*l_ptr)->name);
2305 goto exit;
2306 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002307 *l_ptr = dest_link;
2308 msg = msg_get_wrapped(tunnel_msg);
2309
2310 if (msg_typ == DUPLICATE_MSG) {
Allan Stephensb29f1422010-12-31 18:59:25 +00002311 if (less(msg_seqno(msg), mod(dest_link->next_in_no)))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002312 goto exit;
Allan Stephens0e659672010-12-31 18:59:32 +00002313 *buf = buf_extract(tunnel_buf, INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002314 if (*buf == NULL) {
Allan Stephensa10bd922006-06-25 23:52:17 -07002315 warn("Link changeover error, duplicate msg dropped\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002316 goto exit;
2317 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002318 buf_discard(tunnel_buf);
2319 return 1;
2320 }
2321
2322 /* First original message ?: */
2323
Per Liden4323add2006-01-18 00:38:21 +01002324 if (tipc_link_is_up(dest_link)) {
Allan Stephensa10bd922006-06-25 23:52:17 -07002325 info("Resetting link <%s>, changeover initiated by peer\n",
2326 dest_link->name);
Per Liden4323add2006-01-18 00:38:21 +01002327 tipc_link_reset(dest_link);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002328 dest_link->exp_msg_count = msg_count;
2329 if (!msg_count)
2330 goto exit;
2331 } else if (dest_link->exp_msg_count == START_CHANGEOVER) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002332 dest_link->exp_msg_count = msg_count;
2333 if (!msg_count)
2334 goto exit;
2335 }
2336
2337 /* Receive original message */
2338
2339 if (dest_link->exp_msg_count == 0) {
Allan Stephens5392d642006-06-25 23:52:50 -07002340 warn("Link switchover error, "
2341 "got too many tunnelled messages\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002342 goto exit;
2343 }
2344 dest_link->exp_msg_count--;
2345 if (less(msg_seqno(msg), dest_link->reset_checkpoint)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002346 goto exit;
2347 } else {
2348 *buf = buf_extract(tunnel_buf, INT_H_SIZE);
2349 if (*buf != NULL) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002350 buf_discard(tunnel_buf);
2351 return 1;
2352 } else {
Allan Stephensa10bd922006-06-25 23:52:17 -07002353 warn("Link changeover error, original msg dropped\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002354 }
2355 }
2356exit:
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002357 *buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002358 buf_discard(tunnel_buf);
2359 return 0;
2360}
2361
2362/*
2363 * Bundler functionality:
2364 */
Per Liden4323add2006-01-18 00:38:21 +01002365void tipc_link_recv_bundle(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002366{
2367 u32 msgcount = msg_msgcnt(buf_msg(buf));
2368 u32 pos = INT_H_SIZE;
2369 struct sk_buff *obuf;
2370
Per Lidenb97bf3f2006-01-02 19:04:38 +01002371 while (msgcount--) {
2372 obuf = buf_extract(buf, pos);
2373 if (obuf == NULL) {
Allan Stephensa10bd922006-06-25 23:52:17 -07002374 warn("Link unable to unbundle message(s)\n");
2375 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07002376 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002377 pos += align(msg_size(buf_msg(obuf)));
Per Liden4323add2006-01-18 00:38:21 +01002378 tipc_net_route_msg(obuf);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002379 }
2380 buf_discard(buf);
2381}
2382
2383/*
2384 * Fragmentation/defragmentation:
2385 */
2386
2387
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002388/*
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002389 * link_send_long_buf: Entry for buffers needing fragmentation.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002390 * The buffer is complete, inclusive total message length.
Per Lidenb97bf3f2006-01-02 19:04:38 +01002391 * Returns user data length.
2392 */
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002393static int link_send_long_buf(struct link *l_ptr, struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002394{
2395 struct tipc_msg *inmsg = buf_msg(buf);
2396 struct tipc_msg fragm_hdr;
2397 u32 insize = msg_size(inmsg);
2398 u32 dsz = msg_data_sz(inmsg);
2399 unchar *crs = buf->data;
2400 u32 rest = insize;
Allan Stephens15e979d2010-05-11 14:30:10 +00002401 u32 pack_sz = l_ptr->max_pkt;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002402 u32 fragm_sz = pack_sz - INT_H_SIZE;
2403 u32 fragm_no = 1;
Allan Stephens9c396a72008-06-04 17:36:58 -07002404 u32 destaddr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002405
2406 if (msg_short(inmsg))
2407 destaddr = l_ptr->addr;
Allan Stephens9c396a72008-06-04 17:36:58 -07002408 else
2409 destaddr = msg_destnode(inmsg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002410
2411 if (msg_routed(inmsg))
2412 msg_set_prevnode(inmsg, tipc_own_addr);
2413
2414 /* Prepare reusable fragment header: */
2415
Allan Stephensc68ca7b2010-05-11 14:30:12 +00002416 tipc_msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
Allan Stephens75715212008-06-04 17:37:34 -07002417 INT_H_SIZE, destaddr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002418 msg_set_link_selector(&fragm_hdr, msg_link_selector(inmsg));
2419 msg_set_long_msgno(&fragm_hdr, mod(l_ptr->long_msg_seq_no++));
2420 msg_set_fragm_no(&fragm_hdr, fragm_no);
2421 l_ptr->stats.sent_fragmented++;
2422
2423 /* Chop up message: */
2424
2425 while (rest > 0) {
2426 struct sk_buff *fragm;
2427
2428 if (rest <= fragm_sz) {
2429 fragm_sz = rest;
2430 msg_set_type(&fragm_hdr, LAST_FRAGMENT);
2431 }
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002432 fragm = tipc_buf_acquire(fragm_sz + INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002433 if (fragm == NULL) {
Allan Stephensa10bd922006-06-25 23:52:17 -07002434 warn("Link unable to fragment message\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002435 dsz = -ENOMEM;
2436 goto exit;
2437 }
2438 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002439 skb_copy_to_linear_data(fragm, &fragm_hdr, INT_H_SIZE);
2440 skb_copy_to_linear_data_offset(fragm, INT_H_SIZE, crs,
2441 fragm_sz);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002442 /* Send queued messages first, if any: */
2443
2444 l_ptr->stats.sent_fragments++;
Per Liden4323add2006-01-18 00:38:21 +01002445 tipc_link_send_buf(l_ptr, fragm);
2446 if (!tipc_link_is_up(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002447 return dsz;
2448 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
2449 rest -= fragm_sz;
2450 crs += fragm_sz;
2451 msg_set_type(&fragm_hdr, FRAGMENT);
2452 }
2453exit:
2454 buf_discard(buf);
2455 return dsz;
2456}
2457
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002458/*
2459 * A pending message being re-assembled must store certain values
2460 * to handle subsequent fragments correctly. The following functions
Per Lidenb97bf3f2006-01-02 19:04:38 +01002461 * help storing these values in unused, available fields in the
2462 * pending message. This makes dynamic memory allocation unecessary.
2463 */
2464
Sam Ravnborg05790c62006-03-20 22:37:04 -08002465static void set_long_msg_seqno(struct sk_buff *buf, u32 seqno)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002466{
2467 msg_set_seqno(buf_msg(buf), seqno);
2468}
2469
Sam Ravnborg05790c62006-03-20 22:37:04 -08002470static u32 get_fragm_size(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002471{
2472 return msg_ack(buf_msg(buf));
2473}
2474
Sam Ravnborg05790c62006-03-20 22:37:04 -08002475static void set_fragm_size(struct sk_buff *buf, u32 sz)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002476{
2477 msg_set_ack(buf_msg(buf), sz);
2478}
2479
Sam Ravnborg05790c62006-03-20 22:37:04 -08002480static u32 get_expected_frags(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002481{
2482 return msg_bcast_ack(buf_msg(buf));
2483}
2484
Sam Ravnborg05790c62006-03-20 22:37:04 -08002485static void set_expected_frags(struct sk_buff *buf, u32 exp)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002486{
2487 msg_set_bcast_ack(buf_msg(buf), exp);
2488}
2489
Sam Ravnborg05790c62006-03-20 22:37:04 -08002490static u32 get_timer_cnt(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002491{
2492 return msg_reroute_cnt(buf_msg(buf));
2493}
2494
Sam Ravnborg05790c62006-03-20 22:37:04 -08002495static void incr_timer_cnt(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002496{
2497 msg_incr_reroute_cnt(buf_msg(buf));
2498}
2499
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002500/*
2501 * tipc_link_recv_fragment(): Called with node lock on. Returns
Per Lidenb97bf3f2006-01-02 19:04:38 +01002502 * the reassembled buffer if message is complete.
2503 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002504int tipc_link_recv_fragment(struct sk_buff **pending, struct sk_buff **fb,
Per Liden4323add2006-01-18 00:38:21 +01002505 struct tipc_msg **m)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002506{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002507 struct sk_buff *prev = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002508 struct sk_buff *fbuf = *fb;
2509 struct tipc_msg *fragm = buf_msg(fbuf);
2510 struct sk_buff *pbuf = *pending;
2511 u32 long_msg_seq_no = msg_long_msgno(fragm);
2512
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002513 *fb = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002514
2515 /* Is there an incomplete message waiting for this fragment? */
2516
Joe Perchesf64f9e72009-11-29 16:55:45 -08002517 while (pbuf && ((msg_seqno(buf_msg(pbuf)) != long_msg_seq_no) ||
2518 (msg_orignode(fragm) != msg_orignode(buf_msg(pbuf))))) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002519 prev = pbuf;
2520 pbuf = pbuf->next;
2521 }
2522
2523 if (!pbuf && (msg_type(fragm) == FIRST_FRAGMENT)) {
2524 struct tipc_msg *imsg = (struct tipc_msg *)msg_data(fragm);
2525 u32 msg_sz = msg_size(imsg);
2526 u32 fragm_sz = msg_data_sz(fragm);
2527 u32 exp_fragm_cnt = msg_sz/fragm_sz + !!(msg_sz % fragm_sz);
2528 u32 max = TIPC_MAX_USER_MSG_SIZE + LONG_H_SIZE;
2529 if (msg_type(imsg) == TIPC_MCAST_MSG)
2530 max = TIPC_MAX_USER_MSG_SIZE + MCAST_H_SIZE;
2531 if (msg_size(imsg) > max) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002532 buf_discard(fbuf);
2533 return 0;
2534 }
stephen hemminger31e3c3f2010-10-13 13:20:35 +00002535 pbuf = tipc_buf_acquire(msg_size(imsg));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002536 if (pbuf != NULL) {
2537 pbuf->next = *pending;
2538 *pending = pbuf;
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002539 skb_copy_to_linear_data(pbuf, imsg,
2540 msg_data_sz(fragm));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002541 /* Prepare buffer for subsequent fragments. */
2542
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002543 set_long_msg_seqno(pbuf, long_msg_seq_no);
Allan Stephens0e659672010-12-31 18:59:32 +00002544 set_fragm_size(pbuf, fragm_sz);
2545 set_expected_frags(pbuf, exp_fragm_cnt - 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002546 } else {
Allan Stephensa10bd922006-06-25 23:52:17 -07002547 warn("Link unable to reassemble fragmented message\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002548 }
2549 buf_discard(fbuf);
2550 return 0;
2551 } else if (pbuf && (msg_type(fragm) != FIRST_FRAGMENT)) {
2552 u32 dsz = msg_data_sz(fragm);
2553 u32 fsz = get_fragm_size(pbuf);
2554 u32 crs = ((msg_fragm_no(fragm) - 1) * fsz);
2555 u32 exp_frags = get_expected_frags(pbuf) - 1;
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -03002556 skb_copy_to_linear_data_offset(pbuf, crs,
2557 msg_data(fragm), dsz);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002558 buf_discard(fbuf);
2559
2560 /* Is message complete? */
2561
2562 if (exp_frags == 0) {
2563 if (prev)
2564 prev->next = pbuf->next;
2565 else
2566 *pending = pbuf->next;
2567 msg_reset_reroute_cnt(buf_msg(pbuf));
2568 *fb = pbuf;
2569 *m = buf_msg(pbuf);
2570 return 1;
2571 }
Allan Stephens0e659672010-12-31 18:59:32 +00002572 set_expected_frags(pbuf, exp_frags);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002573 return 0;
2574 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002575 buf_discard(fbuf);
2576 return 0;
2577}
2578
2579/**
2580 * link_check_defragm_bufs - flush stale incoming message fragments
2581 * @l_ptr: pointer to link
2582 */
2583
2584static void link_check_defragm_bufs(struct link *l_ptr)
2585{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002586 struct sk_buff *prev = NULL;
2587 struct sk_buff *next = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002588 struct sk_buff *buf = l_ptr->defragm_buf;
2589
2590 if (!buf)
2591 return;
2592 if (!link_working_working(l_ptr))
2593 return;
2594 while (buf) {
2595 u32 cnt = get_timer_cnt(buf);
2596
2597 next = buf->next;
2598 if (cnt < 4) {
2599 incr_timer_cnt(buf);
2600 prev = buf;
2601 } else {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002602 if (prev)
2603 prev->next = buf->next;
2604 else
2605 l_ptr->defragm_buf = buf->next;
2606 buf_discard(buf);
2607 }
2608 buf = next;
2609 }
2610}
2611
2612
2613
2614static void link_set_supervision_props(struct link *l_ptr, u32 tolerance)
2615{
Allan Stephens5413b4c2011-01-18 13:24:55 -05002616 if ((tolerance < TIPC_MIN_LINK_TOL) || (tolerance > TIPC_MAX_LINK_TOL))
2617 return;
2618
Per Lidenb97bf3f2006-01-02 19:04:38 +01002619 l_ptr->tolerance = tolerance;
2620 l_ptr->continuity_interval =
2621 ((tolerance / 4) > 500) ? 500 : tolerance / 4;
2622 l_ptr->abort_limit = tolerance / (l_ptr->continuity_interval / 4);
2623}
2624
2625
Per Liden4323add2006-01-18 00:38:21 +01002626void tipc_link_set_queue_limits(struct link *l_ptr, u32 window)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002627{
2628 /* Data messages from this node, inclusive FIRST_FRAGM */
Allan Stephens06d82c92008-03-06 15:06:55 -08002629 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE] = window;
2630 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE] = (window / 3) * 4;
2631 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE] = (window / 3) * 5;
2632 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE] = (window / 3) * 6;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002633 /* Transiting data messages,inclusive FIRST_FRAGM */
Allan Stephens06d82c92008-03-06 15:06:55 -08002634 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE + 4] = 300;
2635 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE + 4] = 600;
2636 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE + 4] = 900;
2637 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE + 4] = 1200;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002638 l_ptr->queue_limit[CONN_MANAGER] = 1200;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002639 l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;
2640 l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000;
2641 /* FRAGMENT and LAST_FRAGMENT packets */
2642 l_ptr->queue_limit[MSG_FRAGMENTER] = 4000;
2643}
2644
2645/**
2646 * link_find_link - locate link by name
2647 * @name - ptr to link name string
2648 * @node - ptr to area to be filled with ptr to associated node
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002649 *
Per Liden4323add2006-01-18 00:38:21 +01002650 * Caller must hold 'tipc_net_lock' to ensure node and bearer are not deleted;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002651 * this also prevents link deletion.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002652 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01002653 * Returns pointer to link (or 0 if invalid link name).
2654 */
2655
David S. Miller6c000552008-09-02 23:38:32 -07002656static struct link *link_find_link(const char *name, struct tipc_node **node)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002657{
2658 struct link_name link_name_parts;
Allan Stephens2d627b92011-01-07 13:00:11 -05002659 struct tipc_bearer *b_ptr;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002660 struct link *l_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002661
2662 if (!link_name_validate(name, &link_name_parts))
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002663 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002664
Per Liden4323add2006-01-18 00:38:21 +01002665 b_ptr = tipc_bearer_find_interface(link_name_parts.if_local);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002666 if (!b_ptr)
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002667 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002668
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002669 *node = tipc_node_find(link_name_parts.addr_peer);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002670 if (!*node)
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002671 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002672
2673 l_ptr = (*node)->links[b_ptr->identity];
2674 if (!l_ptr || strcmp(l_ptr->name, name))
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08002675 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002676
2677 return l_ptr;
2678}
2679
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002680struct sk_buff *tipc_link_cmd_config(const void *req_tlv_area, int req_tlv_space,
Per Liden4323add2006-01-18 00:38:21 +01002681 u16 cmd)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002682{
2683 struct tipc_link_config *args;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002684 u32 new_value;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002685 struct link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -07002686 struct tipc_node *node;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002687 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002688
2689 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG))
Per Liden4323add2006-01-18 00:38:21 +01002690 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002691
2692 args = (struct tipc_link_config *)TLV_DATA(req_tlv_area);
2693 new_value = ntohl(args->value);
2694
Per Liden4323add2006-01-18 00:38:21 +01002695 if (!strcmp(args->name, tipc_bclink_name)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002696 if ((cmd == TIPC_CMD_SET_LINK_WINDOW) &&
Per Liden4323add2006-01-18 00:38:21 +01002697 (tipc_bclink_set_queue_limits(new_value) == 0))
2698 return tipc_cfg_reply_none();
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002699 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
Per Liden4323add2006-01-18 00:38:21 +01002700 " (cannot change setting on broadcast link)");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002701 }
2702
Per Liden4323add2006-01-18 00:38:21 +01002703 read_lock_bh(&tipc_net_lock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002704 l_ptr = link_find_link(args->name, &node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002705 if (!l_ptr) {
Per Liden4323add2006-01-18 00:38:21 +01002706 read_unlock_bh(&tipc_net_lock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002707 return tipc_cfg_reply_error_string("link not found");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002708 }
2709
Per Liden4323add2006-01-18 00:38:21 +01002710 tipc_node_lock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002711 res = -EINVAL;
2712 switch (cmd) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002713 case TIPC_CMD_SET_LINK_TOL:
2714 if ((new_value >= TIPC_MIN_LINK_TOL) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01002715 (new_value <= TIPC_MAX_LINK_TOL)) {
2716 link_set_supervision_props(l_ptr, new_value);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002717 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
Per Liden4323add2006-01-18 00:38:21 +01002718 0, 0, new_value, 0, 0);
Allan Stephens0e35fd52008-07-14 22:44:01 -07002719 res = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002720 }
2721 break;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002722 case TIPC_CMD_SET_LINK_PRI:
Per Liden16cb4b32006-01-13 22:22:22 +01002723 if ((new_value >= TIPC_MIN_LINK_PRI) &&
2724 (new_value <= TIPC_MAX_LINK_PRI)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002725 l_ptr->priority = new_value;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002726 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
Per Liden4323add2006-01-18 00:38:21 +01002727 0, 0, 0, new_value, 0);
Allan Stephens0e35fd52008-07-14 22:44:01 -07002728 res = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002729 }
2730 break;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002731 case TIPC_CMD_SET_LINK_WINDOW:
2732 if ((new_value >= TIPC_MIN_LINK_WIN) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01002733 (new_value <= TIPC_MAX_LINK_WIN)) {
Per Liden4323add2006-01-18 00:38:21 +01002734 tipc_link_set_queue_limits(l_ptr, new_value);
Allan Stephens0e35fd52008-07-14 22:44:01 -07002735 res = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002736 }
2737 break;
2738 }
Per Liden4323add2006-01-18 00:38:21 +01002739 tipc_node_unlock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002740
Per Liden4323add2006-01-18 00:38:21 +01002741 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002742 if (res)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002743 return tipc_cfg_reply_error_string("cannot change link setting");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002744
Per Liden4323add2006-01-18 00:38:21 +01002745 return tipc_cfg_reply_none();
Per Lidenb97bf3f2006-01-02 19:04:38 +01002746}
2747
2748/**
2749 * link_reset_statistics - reset link statistics
2750 * @l_ptr: pointer to link
2751 */
2752
2753static void link_reset_statistics(struct link *l_ptr)
2754{
2755 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
2756 l_ptr->stats.sent_info = l_ptr->next_out_no;
2757 l_ptr->stats.recv_info = l_ptr->next_in_no;
2758}
2759
Per Liden4323add2006-01-18 00:38:21 +01002760struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002761{
2762 char *link_name;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002763 struct link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -07002764 struct tipc_node *node;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002765
2766 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
Per Liden4323add2006-01-18 00:38:21 +01002767 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002768
2769 link_name = (char *)TLV_DATA(req_tlv_area);
Per Liden4323add2006-01-18 00:38:21 +01002770 if (!strcmp(link_name, tipc_bclink_name)) {
2771 if (tipc_bclink_reset_stats())
2772 return tipc_cfg_reply_error_string("link not found");
2773 return tipc_cfg_reply_none();
Per Lidenb97bf3f2006-01-02 19:04:38 +01002774 }
2775
Per Liden4323add2006-01-18 00:38:21 +01002776 read_lock_bh(&tipc_net_lock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002777 l_ptr = link_find_link(link_name, &node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002778 if (!l_ptr) {
Per Liden4323add2006-01-18 00:38:21 +01002779 read_unlock_bh(&tipc_net_lock);
2780 return tipc_cfg_reply_error_string("link not found");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002781 }
2782
Per Liden4323add2006-01-18 00:38:21 +01002783 tipc_node_lock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002784 link_reset_statistics(l_ptr);
Per Liden4323add2006-01-18 00:38:21 +01002785 tipc_node_unlock(node);
2786 read_unlock_bh(&tipc_net_lock);
2787 return tipc_cfg_reply_none();
Per Lidenb97bf3f2006-01-02 19:04:38 +01002788}
2789
2790/**
2791 * percent - convert count to a percentage of total (rounding up or down)
2792 */
2793
2794static u32 percent(u32 count, u32 total)
2795{
2796 return (count * 100 + (total / 2)) / total;
2797}
2798
2799/**
Per Liden4323add2006-01-18 00:38:21 +01002800 * tipc_link_stats - print link statistics
Per Lidenb97bf3f2006-01-02 19:04:38 +01002801 * @name: link name
2802 * @buf: print buffer area
2803 * @buf_size: size of print buffer area
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002804 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01002805 * Returns length of print buffer data string (or 0 if error)
2806 */
2807
Per Liden4323add2006-01-18 00:38:21 +01002808static int tipc_link_stats(const char *name, char *buf, const u32 buf_size)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002809{
2810 struct print_buf pb;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002811 struct link *l_ptr;
David S. Miller6c000552008-09-02 23:38:32 -07002812 struct tipc_node *node;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002813 char *status;
2814 u32 profile_total = 0;
2815
Per Liden4323add2006-01-18 00:38:21 +01002816 if (!strcmp(name, tipc_bclink_name))
2817 return tipc_bclink_stats(buf, buf_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002818
Per Liden4323add2006-01-18 00:38:21 +01002819 tipc_printbuf_init(&pb, buf, buf_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002820
Per Liden4323add2006-01-18 00:38:21 +01002821 read_lock_bh(&tipc_net_lock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002822 l_ptr = link_find_link(name, &node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002823 if (!l_ptr) {
Per Liden4323add2006-01-18 00:38:21 +01002824 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002825 return 0;
2826 }
Per Liden4323add2006-01-18 00:38:21 +01002827 tipc_node_lock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002828
Per Liden4323add2006-01-18 00:38:21 +01002829 if (tipc_link_is_active(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002830 status = "ACTIVE";
Per Liden4323add2006-01-18 00:38:21 +01002831 else if (tipc_link_is_up(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01002832 status = "STANDBY";
2833 else
2834 status = "DEFUNCT";
2835 tipc_printf(&pb, "Link <%s>\n"
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002836 " %s MTU:%u Priority:%u Tolerance:%u ms"
2837 " Window:%u packets\n",
Allan Stephens15e979d2010-05-11 14:30:10 +00002838 l_ptr->name, status, l_ptr->max_pkt,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002839 l_ptr->priority, l_ptr->tolerance, l_ptr->queue_limit[0]);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002840 tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +01002841 l_ptr->next_in_no - l_ptr->stats.recv_info,
2842 l_ptr->stats.recv_fragments,
2843 l_ptr->stats.recv_fragmented,
2844 l_ptr->stats.recv_bundles,
2845 l_ptr->stats.recv_bundled);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002846 tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +01002847 l_ptr->next_out_no - l_ptr->stats.sent_info,
2848 l_ptr->stats.sent_fragments,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002849 l_ptr->stats.sent_fragmented,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002850 l_ptr->stats.sent_bundles,
2851 l_ptr->stats.sent_bundled);
2852 profile_total = l_ptr->stats.msg_length_counts;
2853 if (!profile_total)
2854 profile_total = 1;
2855 tipc_printf(&pb, " TX profile sample:%u packets average:%u octets\n"
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002856 " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% "
2857 "-16354:%u%% -32768:%u%% -66000:%u%%\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +01002858 l_ptr->stats.msg_length_counts,
2859 l_ptr->stats.msg_lengths_total / profile_total,
2860 percent(l_ptr->stats.msg_length_profile[0], profile_total),
2861 percent(l_ptr->stats.msg_length_profile[1], profile_total),
2862 percent(l_ptr->stats.msg_length_profile[2], profile_total),
2863 percent(l_ptr->stats.msg_length_profile[3], profile_total),
2864 percent(l_ptr->stats.msg_length_profile[4], profile_total),
2865 percent(l_ptr->stats.msg_length_profile[5], profile_total),
2866 percent(l_ptr->stats.msg_length_profile[6], profile_total));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002867 tipc_printf(&pb, " RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +01002868 l_ptr->stats.recv_states,
2869 l_ptr->stats.recv_probes,
2870 l_ptr->stats.recv_nacks,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002871 l_ptr->stats.deferred_recv,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002872 l_ptr->stats.duplicates);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002873 tipc_printf(&pb, " TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
2874 l_ptr->stats.sent_states,
2875 l_ptr->stats.sent_probes,
2876 l_ptr->stats.sent_nacks,
2877 l_ptr->stats.sent_acks,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002878 l_ptr->stats.retransmitted);
2879 tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
2880 l_ptr->stats.bearer_congs,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002881 l_ptr->stats.link_congs,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002882 l_ptr->stats.max_queue_sz,
2883 l_ptr->stats.queue_sz_counts
2884 ? (l_ptr->stats.accu_queue_sz / l_ptr->stats.queue_sz_counts)
2885 : 0);
2886
Per Liden4323add2006-01-18 00:38:21 +01002887 tipc_node_unlock(node);
2888 read_unlock_bh(&tipc_net_lock);
2889 return tipc_printbuf_validate(&pb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002890}
2891
2892#define MAX_LINK_STATS_INFO 2000
2893
Per Liden4323add2006-01-18 00:38:21 +01002894struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002895{
2896 struct sk_buff *buf;
2897 struct tlv_desc *rep_tlv;
2898 int str_len;
2899
2900 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
Per Liden4323add2006-01-18 00:38:21 +01002901 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002902
Per Liden4323add2006-01-18 00:38:21 +01002903 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_LINK_STATS_INFO));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002904 if (!buf)
2905 return NULL;
2906
2907 rep_tlv = (struct tlv_desc *)buf->data;
2908
Per Liden4323add2006-01-18 00:38:21 +01002909 str_len = tipc_link_stats((char *)TLV_DATA(req_tlv_area),
2910 (char *)TLV_DATA(rep_tlv), MAX_LINK_STATS_INFO);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002911 if (!str_len) {
2912 buf_discard(buf);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002913 return tipc_cfg_reply_error_string("link not found");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002914 }
2915
2916 skb_put(buf, TLV_SPACE(str_len));
2917 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
2918
2919 return buf;
2920}
2921
Per Lidenb97bf3f2006-01-02 19:04:38 +01002922/**
Per Liden4323add2006-01-18 00:38:21 +01002923 * tipc_link_get_max_pkt - get maximum packet size to use when sending to destination
Per Lidenb97bf3f2006-01-02 19:04:38 +01002924 * @dest: network address of destination node
2925 * @selector: used to select from set of active links
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002926 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01002927 * If no active link can be found, uses default maximum packet size.
2928 */
2929
Per Liden4323add2006-01-18 00:38:21 +01002930u32 tipc_link_get_max_pkt(u32 dest, u32 selector)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002931{
David S. Miller6c000552008-09-02 23:38:32 -07002932 struct tipc_node *n_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002933 struct link *l_ptr;
2934 u32 res = MAX_PKT_DEFAULT;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002935
Per Lidenb97bf3f2006-01-02 19:04:38 +01002936 if (dest == tipc_own_addr)
2937 return MAX_MSG_SIZE;
2938
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002939 read_lock_bh(&tipc_net_lock);
Allan Stephens51a8e4d2010-12-31 18:59:18 +00002940 n_ptr = tipc_node_find(dest);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002941 if (n_ptr) {
Per Liden4323add2006-01-18 00:38:21 +01002942 tipc_node_lock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002943 l_ptr = n_ptr->active_links[selector & 1];
2944 if (l_ptr)
Allan Stephens15e979d2010-05-11 14:30:10 +00002945 res = l_ptr->max_pkt;
Per Liden4323add2006-01-18 00:38:21 +01002946 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002947 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002948 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002949 return res;
2950}
2951
Allan Stephens8d64a5b2010-12-31 18:59:27 +00002952static void link_print(struct link *l_ptr, const char *str)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002953{
Allan Stephens8d64a5b2010-12-31 18:59:27 +00002954 char print_area[256];
2955 struct print_buf pb;
2956 struct print_buf *buf = &pb;
2957
2958 tipc_printbuf_init(buf, print_area, sizeof(print_area));
2959
Per Lidenb97bf3f2006-01-02 19:04:38 +01002960 tipc_printf(buf, str);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002961 tipc_printf(buf, "Link %x<%s>:",
Allan Stephens2d627b92011-01-07 13:00:11 -05002962 l_ptr->addr, l_ptr->b_ptr->name);
Allan Stephens8d64a5b2010-12-31 18:59:27 +00002963
2964#ifdef CONFIG_TIPC_DEBUG
2965 if (link_reset_reset(l_ptr) || link_reset_unknown(l_ptr))
2966 goto print_state;
2967
Per Lidenb97bf3f2006-01-02 19:04:38 +01002968 tipc_printf(buf, ": NXO(%u):", mod(l_ptr->next_out_no));
2969 tipc_printf(buf, "NXI(%u):", mod(l_ptr->next_in_no));
2970 tipc_printf(buf, "SQUE");
2971 if (l_ptr->first_out) {
2972 tipc_printf(buf, "[%u..", msg_seqno(buf_msg(l_ptr->first_out)));
2973 if (l_ptr->next_out)
2974 tipc_printf(buf, "%u..",
2975 msg_seqno(buf_msg(l_ptr->next_out)));
Allan Stephensb82834e2010-05-11 14:30:04 +00002976 tipc_printf(buf, "%u]", msg_seqno(buf_msg(l_ptr->last_out)));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002977 if ((mod(msg_seqno(buf_msg(l_ptr->last_out)) -
2978 msg_seqno(buf_msg(l_ptr->first_out)))
Joe Perchesf64f9e72009-11-29 16:55:45 -08002979 != (l_ptr->out_queue_size - 1)) ||
2980 (l_ptr->last_out->next != NULL)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01002981 tipc_printf(buf, "\nSend queue inconsistency\n");
Allan Stephensc8a61b52011-01-18 13:31:32 -05002982 tipc_printf(buf, "first_out= %p ", l_ptr->first_out);
2983 tipc_printf(buf, "next_out= %p ", l_ptr->next_out);
2984 tipc_printf(buf, "last_out= %p ", l_ptr->last_out);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002985 }
2986 } else
2987 tipc_printf(buf, "[]");
2988 tipc_printf(buf, "SQSIZ(%u)", l_ptr->out_queue_size);
2989 if (l_ptr->oldest_deferred_in) {
2990 u32 o = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
2991 u32 n = msg_seqno(buf_msg(l_ptr->newest_deferred_in));
2992 tipc_printf(buf, ":RQUE[%u..%u]", o, n);
2993 if (l_ptr->deferred_inqueue_sz != mod((n + 1) - o)) {
2994 tipc_printf(buf, ":RQSIZ(%u)",
2995 l_ptr->deferred_inqueue_sz);
2996 }
2997 }
Allan Stephens8d64a5b2010-12-31 18:59:27 +00002998print_state:
2999#endif
3000
Per Lidenb97bf3f2006-01-02 19:04:38 +01003001 if (link_working_unknown(l_ptr))
3002 tipc_printf(buf, ":WU");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00003003 else if (link_reset_reset(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01003004 tipc_printf(buf, ":RR");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00003005 else if (link_reset_unknown(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01003006 tipc_printf(buf, ":RU");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00003007 else if (link_working_working(l_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +01003008 tipc_printf(buf, ":WW");
3009 tipc_printf(buf, "\n");
Allan Stephens8d64a5b2010-12-31 18:59:27 +00003010
3011 tipc_printbuf_validate(buf);
3012 info("%s", print_area);
Per Lidenb97bf3f2006-01-02 19:04:38 +01003013}
3014