Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
170b3927 | 4 | * Copyright (c) 1996-2007, 2012-2014, Ericsson AB |
198d73b8 | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 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. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * 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 | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
b97bf3fd | 38 | #include "link.h" |
7be57fc6 | 39 | #include "bcast.h" |
9816f061 | 40 | #include "socket.h" |
b97bf3fd | 41 | #include "name_distr.h" |
b97bf3fd PL |
42 | #include "discover.h" |
43 | #include "config.h" | |
0655f6a8 | 44 | #include "netlink.h" |
b97bf3fd | 45 | |
796c75d0 YX |
46 | #include <linux/pkt_sched.h> |
47 | ||
2cf8aa19 EH |
48 | /* |
49 | * Error message prefixes | |
50 | */ | |
51 | static const char *link_co_err = "Link changeover error, "; | |
52 | static const char *link_rst_msg = "Resetting link "; | |
53 | static const char *link_unk_evt = "Unknown link event "; | |
b97bf3fd | 54 | |
7be57fc6 RA |
55 | static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = { |
56 | [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC }, | |
57 | [TIPC_NLA_LINK_NAME] = { | |
58 | .type = NLA_STRING, | |
59 | .len = TIPC_MAX_LINK_NAME | |
60 | }, | |
61 | [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 }, | |
62 | [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG }, | |
63 | [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG }, | |
64 | [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG }, | |
65 | [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED }, | |
66 | [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED }, | |
67 | [TIPC_NLA_LINK_RX] = { .type = NLA_U32 }, | |
68 | [TIPC_NLA_LINK_TX] = { .type = NLA_U32 } | |
69 | }; | |
70 | ||
0655f6a8 RA |
71 | /* Properties valid for media, bearar and link */ |
72 | static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { | |
73 | [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC }, | |
74 | [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 }, | |
75 | [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 }, | |
76 | [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 } | |
77 | }; | |
78 | ||
a686e685 AS |
79 | /* |
80 | * Out-of-range value for link session numbers | |
81 | */ | |
a686e685 AS |
82 | #define INVALID_SESSION 0x10000 |
83 | ||
c4307285 YH |
84 | /* |
85 | * Link state events: | |
b97bf3fd | 86 | */ |
b97bf3fd PL |
87 | #define STARTING_EVT 856384768 /* link processing trigger */ |
88 | #define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */ | |
89 | #define TIMEOUT_EVT 560817u /* link timer expired */ | |
90 | ||
c4307285 YH |
91 | /* |
92 | * The following two 'message types' is really just implementation | |
93 | * data conveniently stored in the message header. | |
b97bf3fd PL |
94 | * They must not be considered part of the protocol |
95 | */ | |
96 | #define OPEN_MSG 0 | |
97 | #define CLOSED_MSG 1 | |
98 | ||
c4307285 | 99 | /* |
b97bf3fd PL |
100 | * State value stored in 'exp_msg_count' |
101 | */ | |
b97bf3fd PL |
102 | #define START_CHANGEOVER 100000u |
103 | ||
c5898636 JPM |
104 | static void link_handle_out_of_seq_msg(struct tipc_link *link, |
105 | struct sk_buff *skb); | |
106 | static void tipc_link_proto_rcv(struct tipc_link *link, | |
107 | struct sk_buff *skb); | |
108 | static int tipc_link_tunnel_rcv(struct tipc_node *node, | |
109 | struct sk_buff **skb); | |
2f55c437 | 110 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol); |
a18c4bc3 PG |
111 | static void link_state_event(struct tipc_link *l_ptr, u32 event); |
112 | static void link_reset_statistics(struct tipc_link *l_ptr); | |
113 | static void link_print(struct tipc_link *l_ptr, const char *str); | |
247f0f3c YX |
114 | static void tipc_link_sync_xmit(struct tipc_link *l); |
115 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf); | |
c637c103 JPM |
116 | static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb); |
117 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb); | |
31e3c3f6 | 118 | |
b97bf3fd | 119 | /* |
05790c64 | 120 | * Simple link routines |
b97bf3fd | 121 | */ |
05790c64 | 122 | static unsigned int align(unsigned int i) |
b97bf3fd PL |
123 | { |
124 | return (i + 3) & ~3u; | |
125 | } | |
126 | ||
2d72d495 JPM |
127 | static void tipc_link_release(struct kref *kref) |
128 | { | |
129 | kfree(container_of(kref, struct tipc_link, ref)); | |
130 | } | |
131 | ||
132 | static void tipc_link_get(struct tipc_link *l_ptr) | |
133 | { | |
134 | kref_get(&l_ptr->ref); | |
135 | } | |
136 | ||
137 | static void tipc_link_put(struct tipc_link *l_ptr) | |
138 | { | |
139 | kref_put(&l_ptr->ref, tipc_link_release); | |
140 | } | |
141 | ||
a18c4bc3 | 142 | static void link_init_max_pkt(struct tipc_link *l_ptr) |
b97bf3fd | 143 | { |
7f9f95d9 YX |
144 | struct tipc_node *node = l_ptr->owner; |
145 | struct tipc_net *tn = net_generic(node->net, tipc_net_id); | |
7a2f7d18 | 146 | struct tipc_bearer *b_ptr; |
b97bf3fd | 147 | u32 max_pkt; |
c4307285 | 148 | |
7a2f7d18 | 149 | rcu_read_lock(); |
7f9f95d9 | 150 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
151 | if (!b_ptr) { |
152 | rcu_read_unlock(); | |
153 | return; | |
154 | } | |
155 | max_pkt = (b_ptr->mtu & ~3); | |
156 | rcu_read_unlock(); | |
157 | ||
b97bf3fd PL |
158 | if (max_pkt > MAX_MSG_SIZE) |
159 | max_pkt = MAX_MSG_SIZE; | |
160 | ||
c4307285 | 161 | l_ptr->max_pkt_target = max_pkt; |
b97bf3fd PL |
162 | if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT) |
163 | l_ptr->max_pkt = l_ptr->max_pkt_target; | |
c4307285 | 164 | else |
b97bf3fd PL |
165 | l_ptr->max_pkt = MAX_PKT_DEFAULT; |
166 | ||
c4307285 | 167 | l_ptr->max_pkt_probes = 0; |
b97bf3fd PL |
168 | } |
169 | ||
b97bf3fd | 170 | /* |
05790c64 | 171 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 172 | */ |
a18c4bc3 | 173 | int tipc_link_is_up(struct tipc_link *l_ptr) |
b97bf3fd PL |
174 | { |
175 | if (!l_ptr) | |
176 | return 0; | |
a02cec21 | 177 | return link_working_working(l_ptr) || link_working_unknown(l_ptr); |
b97bf3fd PL |
178 | } |
179 | ||
a18c4bc3 | 180 | int tipc_link_is_active(struct tipc_link *l_ptr) |
b97bf3fd | 181 | { |
a02cec21 ED |
182 | return (l_ptr->owner->active_links[0] == l_ptr) || |
183 | (l_ptr->owner->active_links[1] == l_ptr); | |
b97bf3fd PL |
184 | } |
185 | ||
b97bf3fd PL |
186 | /** |
187 | * link_timeout - handle expiration of link timer | |
188 | * @l_ptr: pointer to link | |
b97bf3fd | 189 | */ |
2f55c437 | 190 | static void link_timeout(unsigned long data) |
b97bf3fd | 191 | { |
2f55c437 | 192 | struct tipc_link *l_ptr = (struct tipc_link *)data; |
58dc55f2 YX |
193 | struct sk_buff *skb; |
194 | ||
4323add6 | 195 | tipc_node_lock(l_ptr->owner); |
b97bf3fd PL |
196 | |
197 | /* update counters used in statistical profiling of send traffic */ | |
58dc55f2 | 198 | l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->outqueue); |
b97bf3fd PL |
199 | l_ptr->stats.queue_sz_counts++; |
200 | ||
58dc55f2 YX |
201 | skb = skb_peek(&l_ptr->outqueue); |
202 | if (skb) { | |
203 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
204 | u32 length = msg_size(msg); |
205 | ||
f64f9e71 JP |
206 | if ((msg_user(msg) == MSG_FRAGMENTER) && |
207 | (msg_type(msg) == FIRST_FRAGMENT)) { | |
b97bf3fd PL |
208 | length = msg_size(msg_get_wrapped(msg)); |
209 | } | |
210 | if (length) { | |
211 | l_ptr->stats.msg_lengths_total += length; | |
212 | l_ptr->stats.msg_length_counts++; | |
213 | if (length <= 64) | |
214 | l_ptr->stats.msg_length_profile[0]++; | |
215 | else if (length <= 256) | |
216 | l_ptr->stats.msg_length_profile[1]++; | |
217 | else if (length <= 1024) | |
218 | l_ptr->stats.msg_length_profile[2]++; | |
219 | else if (length <= 4096) | |
220 | l_ptr->stats.msg_length_profile[3]++; | |
221 | else if (length <= 16384) | |
222 | l_ptr->stats.msg_length_profile[4]++; | |
223 | else if (length <= 32768) | |
224 | l_ptr->stats.msg_length_profile[5]++; | |
225 | else | |
226 | l_ptr->stats.msg_length_profile[6]++; | |
227 | } | |
228 | } | |
229 | ||
230 | /* do all other link processing performed on a periodic basis */ | |
b97bf3fd PL |
231 | link_state_event(l_ptr, TIMEOUT_EVT); |
232 | ||
233 | if (l_ptr->next_out) | |
47b4c9a8 | 234 | tipc_link_push_packets(l_ptr); |
b97bf3fd | 235 | |
4323add6 | 236 | tipc_node_unlock(l_ptr->owner); |
2d72d495 | 237 | tipc_link_put(l_ptr); |
b97bf3fd PL |
238 | } |
239 | ||
2f55c437 | 240 | static void link_set_timer(struct tipc_link *link, unsigned long time) |
b97bf3fd | 241 | { |
2d72d495 JPM |
242 | if (!mod_timer(&link->timer, jiffies + time)) |
243 | tipc_link_get(link); | |
b97bf3fd PL |
244 | } |
245 | ||
246 | /** | |
4323add6 | 247 | * tipc_link_create - create a new link |
37b9c08a | 248 | * @n_ptr: pointer to associated node |
b97bf3fd | 249 | * @b_ptr: pointer to associated bearer |
b97bf3fd | 250 | * @media_addr: media address to use when sending messages over link |
c4307285 | 251 | * |
b97bf3fd PL |
252 | * Returns pointer to link. |
253 | */ | |
a18c4bc3 | 254 | struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, |
c61dd61d YX |
255 | struct tipc_bearer *b_ptr, |
256 | const struct tipc_media_addr *media_addr) | |
b97bf3fd | 257 | { |
34747539 | 258 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
a18c4bc3 | 259 | struct tipc_link *l_ptr; |
b97bf3fd PL |
260 | struct tipc_msg *msg; |
261 | char *if_name; | |
37b9c08a AS |
262 | char addr_string[16]; |
263 | u32 peer = n_ptr->addr; | |
264 | ||
0372bf5c | 265 | if (n_ptr->link_cnt >= MAX_BEARERS) { |
37b9c08a | 266 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
0372bf5c HB |
267 | pr_err("Attempt to establish %uth link to %s. Max %u allowed.\n", |
268 | n_ptr->link_cnt, addr_string, MAX_BEARERS); | |
37b9c08a AS |
269 | return NULL; |
270 | } | |
271 | ||
272 | if (n_ptr->links[b_ptr->identity]) { | |
273 | tipc_addr_string_fill(addr_string, n_ptr->addr); | |
2cf8aa19 EH |
274 | pr_err("Attempt to establish second link on <%s> to %s\n", |
275 | b_ptr->name, addr_string); | |
37b9c08a AS |
276 | return NULL; |
277 | } | |
b97bf3fd | 278 | |
0da974f4 | 279 | l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC); |
b97bf3fd | 280 | if (!l_ptr) { |
2cf8aa19 | 281 | pr_warn("Link creation failed, no memory\n"); |
b97bf3fd PL |
282 | return NULL; |
283 | } | |
2d72d495 | 284 | kref_init(&l_ptr->ref); |
b97bf3fd | 285 | l_ptr->addr = peer; |
2d627b92 | 286 | if_name = strchr(b_ptr->name, ':') + 1; |
062b4c99 | 287 | sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
34747539 YX |
288 | tipc_zone(tn->own_addr), tipc_cluster(tn->own_addr), |
289 | tipc_node(tn->own_addr), | |
b97bf3fd PL |
290 | if_name, |
291 | tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
062b4c99 | 292 | /* note: peer i/f name is updated by reset/activate message */ |
b97bf3fd | 293 | memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr)); |
37b9c08a | 294 | l_ptr->owner = n_ptr; |
b97bf3fd | 295 | l_ptr->checkpoint = 1; |
f882cb76 | 296 | l_ptr->peer_session = INVALID_SESSION; |
7a2f7d18 | 297 | l_ptr->bearer_id = b_ptr->identity; |
5c216e1d | 298 | link_set_supervision_props(l_ptr, b_ptr->tolerance); |
b97bf3fd PL |
299 | l_ptr->state = RESET_UNKNOWN; |
300 | ||
301 | l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg; | |
302 | msg = l_ptr->pmsg; | |
c5898636 | 303 | tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, |
34747539 | 304 | l_ptr->addr); |
b97bf3fd | 305 | msg_set_size(msg, sizeof(l_ptr->proto_msg)); |
bafa29e3 | 306 | msg_set_session(msg, (tn->random & 0xffff)); |
b97bf3fd PL |
307 | msg_set_bearer_id(msg, b_ptr->identity); |
308 | strcpy((char *)msg_data(msg), if_name); | |
309 | ||
310 | l_ptr->priority = b_ptr->priority; | |
5c216e1d | 311 | tipc_link_set_queue_limits(l_ptr, b_ptr->window); |
b97bf3fd | 312 | |
7a2f7d18 | 313 | l_ptr->net_plane = b_ptr->net_plane; |
b97bf3fd PL |
314 | link_init_max_pkt(l_ptr); |
315 | ||
316 | l_ptr->next_out_no = 1; | |
58dc55f2 | 317 | __skb_queue_head_init(&l_ptr->outqueue); |
bc6fecd4 | 318 | __skb_queue_head_init(&l_ptr->deferred_queue); |
c637c103 JPM |
319 | skb_queue_head_init(&l_ptr->wakeupq); |
320 | skb_queue_head_init(&l_ptr->inputq); | |
321 | skb_queue_head_init(&l_ptr->namedq); | |
b97bf3fd | 322 | link_reset_statistics(l_ptr); |
37b9c08a | 323 | tipc_node_attach_link(n_ptr, l_ptr); |
2f55c437 | 324 | setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr); |
581465fa | 325 | link_state_event(l_ptr, STARTING_EVT); |
b97bf3fd | 326 | |
b97bf3fd PL |
327 | return l_ptr; |
328 | } | |
329 | ||
2d72d495 JPM |
330 | /** |
331 | * link_delete - Conditional deletion of link. | |
332 | * If timer still running, real delete is done when it expires | |
333 | * @link: link to be deleted | |
334 | */ | |
335 | void tipc_link_delete(struct tipc_link *link) | |
336 | { | |
337 | tipc_link_reset_fragments(link); | |
338 | tipc_node_detach_link(link->owner, link); | |
339 | tipc_link_put(link); | |
340 | } | |
341 | ||
f2f9800d YX |
342 | void tipc_link_delete_list(struct net *net, unsigned int bearer_id, |
343 | bool shutting_down) | |
8d8439b6 | 344 | { |
f2f9800d | 345 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
2d72d495 JPM |
346 | struct tipc_link *link; |
347 | struct tipc_node *node; | |
8d8439b6 | 348 | |
6c7a762e | 349 | rcu_read_lock(); |
2d72d495 JPM |
350 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
351 | tipc_node_lock(node); | |
352 | link = node->links[bearer_id]; | |
353 | if (!link) { | |
354 | tipc_node_unlock(node); | |
c61dd61d YX |
355 | continue; |
356 | } | |
2d72d495 JPM |
357 | tipc_link_reset(link); |
358 | if (del_timer(&link->timer)) | |
359 | tipc_link_put(link); | |
360 | link->flags |= LINK_STOPPED; | |
361 | /* Delete link now, or when failover is finished: */ | |
362 | if (shutting_down || !tipc_node_is_up(node)) | |
363 | tipc_link_delete(link); | |
364 | tipc_node_unlock(node); | |
8d8439b6 | 365 | } |
6c7a762e | 366 | rcu_read_unlock(); |
8d8439b6 | 367 | } |
b97bf3fd PL |
368 | |
369 | /** | |
50100a5e JPM |
370 | * link_schedule_user - schedule user for wakeup after congestion |
371 | * @link: congested link | |
372 | * @oport: sending port | |
373 | * @chain_sz: size of buffer chain that was attempted sent | |
374 | * @imp: importance of message attempted sent | |
375 | * Create pseudo msg to send back to user when congestion abates | |
b97bf3fd | 376 | */ |
50100a5e JPM |
377 | static bool link_schedule_user(struct tipc_link *link, u32 oport, |
378 | uint chain_sz, uint imp) | |
b97bf3fd | 379 | { |
50100a5e JPM |
380 | struct sk_buff *buf; |
381 | ||
c5898636 JPM |
382 | buf = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, |
383 | link_own_addr(link), link_own_addr(link), | |
384 | oport, 0, 0); | |
50100a5e JPM |
385 | if (!buf) |
386 | return false; | |
387 | TIPC_SKB_CB(buf)->chain_sz = chain_sz; | |
388 | TIPC_SKB_CB(buf)->chain_imp = imp; | |
c637c103 | 389 | skb_queue_tail(&link->wakeupq, buf); |
50100a5e JPM |
390 | link->stats.link_congs++; |
391 | return true; | |
b97bf3fd PL |
392 | } |
393 | ||
50100a5e JPM |
394 | /** |
395 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
396 | * @link: congested link | |
397 | * Move a number of waiting users, as permitted by available space in | |
398 | * the send queue, from link wait queue to node wait queue for wakeup | |
399 | */ | |
c637c103 | 400 | void link_prepare_wakeup(struct tipc_link *link) |
b97bf3fd | 401 | { |
58dc55f2 | 402 | uint pend_qsz = skb_queue_len(&link->outqueue); |
58d78b32 | 403 | struct sk_buff *skb, *tmp; |
50100a5e | 404 | |
c637c103 | 405 | skb_queue_walk_safe(&link->wakeupq, skb, tmp) { |
58d78b32 | 406 | if (pend_qsz >= link->queue_limit[TIPC_SKB_CB(skb)->chain_imp]) |
b97bf3fd | 407 | break; |
58d78b32 | 408 | pend_qsz += TIPC_SKB_CB(skb)->chain_sz; |
c637c103 JPM |
409 | skb_unlink(skb, &link->wakeupq); |
410 | skb_queue_tail(&link->inputq, skb); | |
411 | link->owner->inputq = &link->inputq; | |
412 | link->owner->action_flags |= TIPC_MSG_EVT; | |
b97bf3fd | 413 | } |
b97bf3fd PL |
414 | } |
415 | ||
b97bf3fd | 416 | /** |
4323add6 | 417 | * tipc_link_reset_fragments - purge link's inbound message fragments queue |
b97bf3fd PL |
418 | * @l_ptr: pointer to link |
419 | */ | |
a18c4bc3 | 420 | void tipc_link_reset_fragments(struct tipc_link *l_ptr) |
b97bf3fd | 421 | { |
37e22164 JPM |
422 | kfree_skb(l_ptr->reasm_buf); |
423 | l_ptr->reasm_buf = NULL; | |
b97bf3fd PL |
424 | } |
425 | ||
c4307285 | 426 | /** |
581465fa | 427 | * tipc_link_purge_queues - purge all pkt queues associated with link |
b97bf3fd PL |
428 | * @l_ptr: pointer to link |
429 | */ | |
581465fa | 430 | void tipc_link_purge_queues(struct tipc_link *l_ptr) |
b97bf3fd | 431 | { |
bc6fecd4 | 432 | __skb_queue_purge(&l_ptr->deferred_queue); |
58dc55f2 | 433 | __skb_queue_purge(&l_ptr->outqueue); |
4323add6 | 434 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
435 | } |
436 | ||
a18c4bc3 | 437 | void tipc_link_reset(struct tipc_link *l_ptr) |
b97bf3fd | 438 | { |
b97bf3fd PL |
439 | u32 prev_state = l_ptr->state; |
440 | u32 checkpoint = l_ptr->next_in_no; | |
5392d646 | 441 | int was_active_link = tipc_link_is_active(l_ptr); |
50100a5e | 442 | struct tipc_node *owner = l_ptr->owner; |
c4307285 | 443 | |
a686e685 | 444 | msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff)); |
b97bf3fd | 445 | |
a686e685 AS |
446 | /* Link is down, accept any session */ |
447 | l_ptr->peer_session = INVALID_SESSION; | |
b97bf3fd | 448 | |
c4307285 | 449 | /* Prepare for max packet size negotiation */ |
b97bf3fd | 450 | link_init_max_pkt(l_ptr); |
c4307285 | 451 | |
b97bf3fd | 452 | l_ptr->state = RESET_UNKNOWN; |
b97bf3fd PL |
453 | |
454 | if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET)) | |
455 | return; | |
456 | ||
4323add6 | 457 | tipc_node_link_down(l_ptr->owner, l_ptr); |
7f9f95d9 | 458 | tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr); |
7368ddf1 | 459 | |
b9d4c339 | 460 | if (was_active_link && tipc_node_active_links(l_ptr->owner)) { |
b97bf3fd PL |
461 | l_ptr->reset_checkpoint = checkpoint; |
462 | l_ptr->exp_msg_count = START_CHANGEOVER; | |
463 | } | |
464 | ||
c637c103 | 465 | /* Clean up all queues, except inputq: */ |
58dc55f2 | 466 | __skb_queue_purge(&l_ptr->outqueue); |
bc6fecd4 | 467 | __skb_queue_purge(&l_ptr->deferred_queue); |
c637c103 JPM |
468 | skb_queue_splice_init(&l_ptr->wakeupq, &l_ptr->inputq); |
469 | if (!skb_queue_empty(&l_ptr->inputq)) | |
470 | owner->action_flags |= TIPC_MSG_EVT; | |
471 | owner->inputq = &l_ptr->inputq; | |
b97bf3fd PL |
472 | l_ptr->next_out = NULL; |
473 | l_ptr->unacked_window = 0; | |
474 | l_ptr->checkpoint = 1; | |
475 | l_ptr->next_out_no = 1; | |
b97bf3fd PL |
476 | l_ptr->fsm_msg_cnt = 0; |
477 | l_ptr->stale_count = 0; | |
478 | link_reset_statistics(l_ptr); | |
b97bf3fd PL |
479 | } |
480 | ||
f2f9800d | 481 | void tipc_link_reset_list(struct net *net, unsigned int bearer_id) |
e0ca2c30 | 482 | { |
f2f9800d | 483 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
e0ca2c30 | 484 | struct tipc_link *l_ptr; |
c61dd61d | 485 | struct tipc_node *n_ptr; |
e0ca2c30 | 486 | |
6c7a762e | 487 | rcu_read_lock(); |
f2f9800d | 488 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
5356f3d7 | 489 | tipc_node_lock(n_ptr); |
c61dd61d YX |
490 | l_ptr = n_ptr->links[bearer_id]; |
491 | if (l_ptr) | |
492 | tipc_link_reset(l_ptr); | |
5356f3d7 | 493 | tipc_node_unlock(n_ptr); |
e0ca2c30 | 494 | } |
6c7a762e | 495 | rcu_read_unlock(); |
e0ca2c30 | 496 | } |
b97bf3fd | 497 | |
7f9f95d9 | 498 | static void link_activate(struct tipc_link *link) |
b97bf3fd | 499 | { |
7f9f95d9 YX |
500 | struct tipc_node *node = link->owner; |
501 | ||
502 | link->next_in_no = 1; | |
503 | link->stats.recv_info = 1; | |
504 | tipc_node_link_up(node, link); | |
505 | tipc_bearer_add_dest(node->net, link->bearer_id, link->addr); | |
b97bf3fd PL |
506 | } |
507 | ||
508 | /** | |
509 | * link_state_event - link finite state machine | |
510 | * @l_ptr: pointer to link | |
511 | * @event: state machine event to process | |
512 | */ | |
95c96174 | 513 | static void link_state_event(struct tipc_link *l_ptr, unsigned int event) |
b97bf3fd | 514 | { |
a18c4bc3 | 515 | struct tipc_link *other; |
2f55c437 | 516 | unsigned long cont_intv = l_ptr->cont_intv; |
b97bf3fd | 517 | |
7d33939f JPM |
518 | if (l_ptr->flags & LINK_STOPPED) |
519 | return; | |
520 | ||
135daee6 | 521 | if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT)) |
b97bf3fd PL |
522 | return; /* Not yet. */ |
523 | ||
77a7e07a YX |
524 | /* Check whether changeover is going on */ |
525 | if (l_ptr->exp_msg_count) { | |
a016892c | 526 | if (event == TIMEOUT_EVT) |
b97bf3fd | 527 | link_set_timer(l_ptr, cont_intv); |
77a7e07a | 528 | return; |
b97bf3fd | 529 | } |
b97bf3fd PL |
530 | |
531 | switch (l_ptr->state) { | |
532 | case WORKING_WORKING: | |
b97bf3fd PL |
533 | switch (event) { |
534 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 535 | case ACTIVATE_MSG: |
b97bf3fd PL |
536 | break; |
537 | case TIMEOUT_EVT: | |
b97bf3fd PL |
538 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
539 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 540 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c YX |
541 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
542 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
543 | l_ptr->fsm_msg_cnt++; |
544 | } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) { | |
247f0f3c YX |
545 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
546 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
547 | l_ptr->fsm_msg_cnt++; |
548 | } | |
549 | link_set_timer(l_ptr, cont_intv); | |
550 | break; | |
551 | } | |
b97bf3fd PL |
552 | l_ptr->state = WORKING_UNKNOWN; |
553 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c | 554 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd PL |
555 | l_ptr->fsm_msg_cnt++; |
556 | link_set_timer(l_ptr, cont_intv / 4); | |
557 | break; | |
558 | case RESET_MSG: | |
3fa9cacd EH |
559 | pr_debug("%s<%s>, requested by peer\n", |
560 | link_rst_msg, l_ptr->name); | |
4323add6 | 561 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
562 | l_ptr->state = RESET_RESET; |
563 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
564 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
565 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
566 | l_ptr->fsm_msg_cnt++; |
567 | link_set_timer(l_ptr, cont_intv); | |
568 | break; | |
569 | default: | |
3fa9cacd | 570 | pr_debug("%s%u in WW state\n", link_unk_evt, event); |
b97bf3fd PL |
571 | } |
572 | break; | |
573 | case WORKING_UNKNOWN: | |
b97bf3fd PL |
574 | switch (event) { |
575 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 576 | case ACTIVATE_MSG: |
b97bf3fd PL |
577 | l_ptr->state = WORKING_WORKING; |
578 | l_ptr->fsm_msg_cnt = 0; | |
579 | link_set_timer(l_ptr, cont_intv); | |
580 | break; | |
581 | case RESET_MSG: | |
3fa9cacd EH |
582 | pr_debug("%s<%s>, requested by peer while probing\n", |
583 | link_rst_msg, l_ptr->name); | |
4323add6 | 584 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
585 | l_ptr->state = RESET_RESET; |
586 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
587 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
588 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
589 | l_ptr->fsm_msg_cnt++; |
590 | link_set_timer(l_ptr, cont_intv); | |
591 | break; | |
592 | case TIMEOUT_EVT: | |
b97bf3fd | 593 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
b97bf3fd PL |
594 | l_ptr->state = WORKING_WORKING; |
595 | l_ptr->fsm_msg_cnt = 0; | |
596 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 597 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c YX |
598 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
599 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
600 | l_ptr->fsm_msg_cnt++; |
601 | } | |
602 | link_set_timer(l_ptr, cont_intv); | |
603 | } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) { | |
247f0f3c YX |
604 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
605 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
606 | l_ptr->fsm_msg_cnt++; |
607 | link_set_timer(l_ptr, cont_intv / 4); | |
608 | } else { /* Link has failed */ | |
3fa9cacd EH |
609 | pr_debug("%s<%s>, peer not responding\n", |
610 | link_rst_msg, l_ptr->name); | |
4323add6 | 611 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
612 | l_ptr->state = RESET_UNKNOWN; |
613 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
614 | tipc_link_proto_xmit(l_ptr, RESET_MSG, |
615 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
616 | l_ptr->fsm_msg_cnt++; |
617 | link_set_timer(l_ptr, cont_intv); | |
618 | } | |
619 | break; | |
620 | default: | |
2cf8aa19 | 621 | pr_err("%s%u in WU state\n", link_unk_evt, event); |
b97bf3fd PL |
622 | } |
623 | break; | |
624 | case RESET_UNKNOWN: | |
b97bf3fd PL |
625 | switch (event) { |
626 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
627 | break; |
628 | case ACTIVATE_MSG: | |
629 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 630 | if (other && link_working_unknown(other)) |
b97bf3fd | 631 | break; |
b97bf3fd PL |
632 | l_ptr->state = WORKING_WORKING; |
633 | l_ptr->fsm_msg_cnt = 0; | |
634 | link_activate(l_ptr); | |
247f0f3c | 635 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd | 636 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 637 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 638 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
639 | link_set_timer(l_ptr, cont_intv); |
640 | break; | |
641 | case RESET_MSG: | |
b97bf3fd PL |
642 | l_ptr->state = RESET_RESET; |
643 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
644 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
645 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
646 | l_ptr->fsm_msg_cnt++; |
647 | link_set_timer(l_ptr, cont_intv); | |
648 | break; | |
649 | case STARTING_EVT: | |
135daee6 | 650 | l_ptr->flags |= LINK_STARTED; |
af9946fd JPM |
651 | l_ptr->fsm_msg_cnt++; |
652 | link_set_timer(l_ptr, cont_intv); | |
653 | break; | |
b97bf3fd | 654 | case TIMEOUT_EVT: |
247f0f3c | 655 | tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0, 0); |
b97bf3fd PL |
656 | l_ptr->fsm_msg_cnt++; |
657 | link_set_timer(l_ptr, cont_intv); | |
658 | break; | |
659 | default: | |
2cf8aa19 | 660 | pr_err("%s%u in RU state\n", link_unk_evt, event); |
b97bf3fd PL |
661 | } |
662 | break; | |
663 | case RESET_RESET: | |
b97bf3fd PL |
664 | switch (event) { |
665 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
666 | case ACTIVATE_MSG: |
667 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 668 | if (other && link_working_unknown(other)) |
b97bf3fd | 669 | break; |
b97bf3fd PL |
670 | l_ptr->state = WORKING_WORKING; |
671 | l_ptr->fsm_msg_cnt = 0; | |
672 | link_activate(l_ptr); | |
247f0f3c | 673 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd | 674 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 675 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 676 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
677 | link_set_timer(l_ptr, cont_intv); |
678 | break; | |
679 | case RESET_MSG: | |
b97bf3fd PL |
680 | break; |
681 | case TIMEOUT_EVT: | |
247f0f3c YX |
682 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
683 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
684 | l_ptr->fsm_msg_cnt++; |
685 | link_set_timer(l_ptr, cont_intv); | |
b97bf3fd PL |
686 | break; |
687 | default: | |
2cf8aa19 | 688 | pr_err("%s%u in RR state\n", link_unk_evt, event); |
b97bf3fd PL |
689 | } |
690 | break; | |
691 | default: | |
2cf8aa19 | 692 | pr_err("Unknown link state %u/%u\n", l_ptr->state, event); |
b97bf3fd PL |
693 | } |
694 | } | |
695 | ||
4f1688b2 JPM |
696 | /* tipc_link_cong: determine return value and how to treat the |
697 | * sent buffer during link congestion. | |
698 | * - For plain, errorless user data messages we keep the buffer and | |
699 | * return -ELINKONG. | |
700 | * - For all other messages we discard the buffer and return -EHOSTUNREACH | |
701 | * - For TIPC internal messages we also reset the link | |
702 | */ | |
a6ca1094 | 703 | static int tipc_link_cong(struct tipc_link *link, struct sk_buff_head *list) |
4f1688b2 | 704 | { |
a6ca1094 YX |
705 | struct sk_buff *skb = skb_peek(list); |
706 | struct tipc_msg *msg = buf_msg(skb); | |
4f1688b2 JPM |
707 | uint imp = tipc_msg_tot_importance(msg); |
708 | u32 oport = msg_tot_origport(msg); | |
709 | ||
50100a5e | 710 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { |
4f1688b2 JPM |
711 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); |
712 | tipc_link_reset(link); | |
50100a5e | 713 | goto drop; |
4f1688b2 | 714 | } |
50100a5e JPM |
715 | if (unlikely(msg_errcode(msg))) |
716 | goto drop; | |
717 | if (unlikely(msg_reroute_cnt(msg))) | |
718 | goto drop; | |
a6ca1094 | 719 | if (TIPC_SKB_CB(skb)->wakeup_pending) |
50100a5e | 720 | return -ELINKCONG; |
a6ca1094 | 721 | if (link_schedule_user(link, oport, skb_queue_len(list), imp)) |
50100a5e JPM |
722 | return -ELINKCONG; |
723 | drop: | |
a6ca1094 | 724 | __skb_queue_purge(list); |
4f1688b2 JPM |
725 | return -EHOSTUNREACH; |
726 | } | |
727 | ||
728 | /** | |
9fbfb8b1 | 729 | * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked |
4f1688b2 | 730 | * @link: link to use |
a6ca1094 YX |
731 | * @list: chain of buffers containing message |
732 | * | |
4f1688b2 JPM |
733 | * Consumes the buffer chain, except when returning -ELINKCONG |
734 | * Returns 0 if success, otherwise errno: -ELINKCONG, -EMSGSIZE (plain socket | |
735 | * user data messages) or -EHOSTUNREACH (all other messages/senders) | |
736 | * Only the socket functions tipc_send_stream() and tipc_send_packet() need | |
737 | * to act on the return value, since they may need to do more send attempts. | |
738 | */ | |
7f9f95d9 YX |
739 | int __tipc_link_xmit(struct net *net, struct tipc_link *link, |
740 | struct sk_buff_head *list) | |
4f1688b2 | 741 | { |
a6ca1094 | 742 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
4f1688b2 | 743 | uint psz = msg_size(msg); |
4f1688b2 JPM |
744 | uint sndlim = link->queue_limit[0]; |
745 | uint imp = tipc_msg_tot_importance(msg); | |
746 | uint mtu = link->max_pkt; | |
747 | uint ack = mod(link->next_in_no - 1); | |
748 | uint seqno = link->next_out_no; | |
749 | uint bc_last_in = link->owner->bclink.last_in; | |
750 | struct tipc_media_addr *addr = &link->media_addr; | |
58dc55f2 | 751 | struct sk_buff_head *outqueue = &link->outqueue; |
a6ca1094 | 752 | struct sk_buff *skb, *tmp; |
4f1688b2 JPM |
753 | |
754 | /* Match queue limits against msg importance: */ | |
58dc55f2 | 755 | if (unlikely(skb_queue_len(outqueue) >= link->queue_limit[imp])) |
a6ca1094 | 756 | return tipc_link_cong(link, list); |
4f1688b2 JPM |
757 | |
758 | /* Has valid packet limit been used ? */ | |
759 | if (unlikely(psz > mtu)) { | |
a6ca1094 | 760 | __skb_queue_purge(list); |
4f1688b2 JPM |
761 | return -EMSGSIZE; |
762 | } | |
763 | ||
764 | /* Prepare each packet for sending, and add to outqueue: */ | |
a6ca1094 YX |
765 | skb_queue_walk_safe(list, skb, tmp) { |
766 | __skb_unlink(skb, list); | |
58dc55f2 | 767 | msg = buf_msg(skb); |
4f1688b2 JPM |
768 | msg_set_word(msg, 2, ((ack << 16) | mod(seqno))); |
769 | msg_set_bcast_ack(msg, bc_last_in); | |
770 | ||
58dc55f2 YX |
771 | if (skb_queue_len(outqueue) < sndlim) { |
772 | __skb_queue_tail(outqueue, skb); | |
7f9f95d9 YX |
773 | tipc_bearer_send(net, link->bearer_id, |
774 | skb, addr); | |
58dc55f2 YX |
775 | link->next_out = NULL; |
776 | link->unacked_window = 0; | |
777 | } else if (tipc_msg_bundle(outqueue, skb, mtu)) { | |
4f1688b2 | 778 | link->stats.sent_bundled++; |
4f1688b2 | 779 | continue; |
c5898636 | 780 | } else if (tipc_msg_make_bundle(outqueue, skb, mtu, |
58dc55f2 | 781 | link->addr)) { |
4f1688b2 JPM |
782 | link->stats.sent_bundled++; |
783 | link->stats.sent_bundles++; | |
4f1688b2 | 784 | if (!link->next_out) |
58dc55f2 | 785 | link->next_out = skb_peek_tail(outqueue); |
4f1688b2 | 786 | } else { |
58dc55f2 | 787 | __skb_queue_tail(outqueue, skb); |
4f1688b2 | 788 | if (!link->next_out) |
58dc55f2 | 789 | link->next_out = skb; |
4f1688b2 JPM |
790 | } |
791 | seqno++; | |
4f1688b2 JPM |
792 | } |
793 | link->next_out_no = seqno; | |
4f1688b2 JPM |
794 | return 0; |
795 | } | |
796 | ||
a6ca1094 YX |
797 | static void skb2list(struct sk_buff *skb, struct sk_buff_head *list) |
798 | { | |
c637c103 | 799 | skb_queue_head_init(list); |
a6ca1094 YX |
800 | __skb_queue_tail(list, skb); |
801 | } | |
802 | ||
803 | static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb) | |
804 | { | |
805 | struct sk_buff_head head; | |
806 | ||
807 | skb2list(skb, &head); | |
7f9f95d9 | 808 | return __tipc_link_xmit(link->owner->net, link, &head); |
a6ca1094 YX |
809 | } |
810 | ||
f2f9800d YX |
811 | int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode, |
812 | u32 selector) | |
a6ca1094 YX |
813 | { |
814 | struct sk_buff_head head; | |
815 | ||
816 | skb2list(skb, &head); | |
f2f9800d | 817 | return tipc_link_xmit(net, &head, dnode, selector); |
a6ca1094 YX |
818 | } |
819 | ||
4f1688b2 | 820 | /** |
9fbfb8b1 | 821 | * tipc_link_xmit() is the general link level function for message sending |
f2f9800d | 822 | * @net: the applicable net namespace |
a6ca1094 | 823 | * @list: chain of buffers containing message |
4f1688b2 JPM |
824 | * @dsz: amount of user data to be sent |
825 | * @dnode: address of destination node | |
826 | * @selector: a number used for deterministic link selection | |
827 | * Consumes the buffer chain, except when returning -ELINKCONG | |
828 | * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE | |
829 | */ | |
f2f9800d YX |
830 | int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode, |
831 | u32 selector) | |
4f1688b2 JPM |
832 | { |
833 | struct tipc_link *link = NULL; | |
834 | struct tipc_node *node; | |
835 | int rc = -EHOSTUNREACH; | |
836 | ||
f2f9800d | 837 | node = tipc_node_find(net, dnode); |
4f1688b2 JPM |
838 | if (node) { |
839 | tipc_node_lock(node); | |
840 | link = node->active_links[selector & 1]; | |
841 | if (link) | |
7f9f95d9 | 842 | rc = __tipc_link_xmit(net, link, list); |
4f1688b2 JPM |
843 | tipc_node_unlock(node); |
844 | } | |
4f1688b2 JPM |
845 | if (link) |
846 | return rc; | |
847 | ||
c637c103 JPM |
848 | if (likely(in_own_node(net, dnode))) |
849 | return tipc_sk_rcv(net, list); | |
4f1688b2 | 850 | |
c637c103 | 851 | __skb_queue_purge(list); |
4f1688b2 JPM |
852 | return rc; |
853 | } | |
854 | ||
c64f7a6a | 855 | /* |
247f0f3c | 856 | * tipc_link_sync_xmit - synchronize broadcast link endpoints. |
c64f7a6a JM |
857 | * |
858 | * Give a newly added peer node the sequence number where it should | |
859 | * start receiving and acking broadcast packets. | |
860 | * | |
861 | * Called with node locked | |
862 | */ | |
25b660c7 | 863 | static void tipc_link_sync_xmit(struct tipc_link *link) |
c64f7a6a | 864 | { |
a6ca1094 | 865 | struct sk_buff *skb; |
c64f7a6a JM |
866 | struct tipc_msg *msg; |
867 | ||
a6ca1094 YX |
868 | skb = tipc_buf_acquire(INT_H_SIZE); |
869 | if (!skb) | |
c64f7a6a JM |
870 | return; |
871 | ||
a6ca1094 | 872 | msg = buf_msg(skb); |
c5898636 | 873 | tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG, |
34747539 | 874 | INT_H_SIZE, link->addr); |
25b660c7 | 875 | msg_set_last_bcast(msg, link->owner->bclink.acked); |
a6ca1094 | 876 | __tipc_link_xmit_skb(link, skb); |
c64f7a6a JM |
877 | } |
878 | ||
879 | /* | |
247f0f3c | 880 | * tipc_link_sync_rcv - synchronize broadcast link endpoints. |
c64f7a6a JM |
881 | * Receive the sequence number where we should start receiving and |
882 | * acking broadcast packets from a newly added peer node, and open | |
883 | * up for reception of such packets. | |
884 | * | |
885 | * Called with node locked | |
886 | */ | |
247f0f3c | 887 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf) |
c64f7a6a JM |
888 | { |
889 | struct tipc_msg *msg = buf_msg(buf); | |
890 | ||
891 | n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); | |
892 | n->bclink.recv_permitted = true; | |
893 | kfree_skb(buf); | |
894 | } | |
895 | ||
58dc55f2 YX |
896 | struct sk_buff *tipc_skb_queue_next(const struct sk_buff_head *list, |
897 | const struct sk_buff *skb) | |
898 | { | |
899 | if (skb_queue_is_last(list, skb)) | |
900 | return NULL; | |
901 | return skb->next; | |
902 | } | |
903 | ||
c4307285 | 904 | /* |
47b4c9a8 YX |
905 | * tipc_link_push_packets - push unsent packets to bearer |
906 | * | |
907 | * Push out the unsent messages of a link where congestion | |
908 | * has abated. Node is locked. | |
909 | * | |
910 | * Called with node locked | |
b97bf3fd | 911 | */ |
47b4c9a8 | 912 | void tipc_link_push_packets(struct tipc_link *l_ptr) |
b97bf3fd | 913 | { |
58dc55f2 YX |
914 | struct sk_buff_head *outqueue = &l_ptr->outqueue; |
915 | struct sk_buff *skb = l_ptr->next_out; | |
47b4c9a8 YX |
916 | struct tipc_msg *msg; |
917 | u32 next, first; | |
b97bf3fd | 918 | |
58dc55f2 | 919 | skb_queue_walk_from(outqueue, skb) { |
47b4c9a8 YX |
920 | msg = buf_msg(skb); |
921 | next = msg_seqno(msg); | |
58dc55f2 | 922 | first = buf_seqno(skb_peek(outqueue)); |
b97bf3fd PL |
923 | |
924 | if (mod(next - first) < l_ptr->queue_limit[0]) { | |
925 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); | |
c4307285 | 926 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
3c294cb3 | 927 | if (msg_user(msg) == MSG_BUNDLER) |
58311d16 | 928 | TIPC_SKB_CB(skb)->bundling = false; |
7f9f95d9 YX |
929 | tipc_bearer_send(l_ptr->owner->net, |
930 | l_ptr->bearer_id, skb, | |
47b4c9a8 | 931 | &l_ptr->media_addr); |
58dc55f2 | 932 | l_ptr->next_out = tipc_skb_queue_next(outqueue, skb); |
47b4c9a8 YX |
933 | } else { |
934 | break; | |
b97bf3fd PL |
935 | } |
936 | } | |
b97bf3fd PL |
937 | } |
938 | ||
3f5a12bd | 939 | void tipc_link_reset_all(struct tipc_node *node) |
d356eeba | 940 | { |
d356eeba AS |
941 | char addr_string[16]; |
942 | u32 i; | |
943 | ||
3f5a12bd | 944 | tipc_node_lock(node); |
d356eeba | 945 | |
2cf8aa19 | 946 | pr_warn("Resetting all links to %s\n", |
3f5a12bd | 947 | tipc_addr_string_fill(addr_string, node->addr)); |
d356eeba AS |
948 | |
949 | for (i = 0; i < MAX_BEARERS; i++) { | |
3f5a12bd YX |
950 | if (node->links[i]) { |
951 | link_print(node->links[i], "Resetting link\n"); | |
952 | tipc_link_reset(node->links[i]); | |
d356eeba AS |
953 | } |
954 | } | |
955 | ||
3f5a12bd | 956 | tipc_node_unlock(node); |
d356eeba AS |
957 | } |
958 | ||
a18c4bc3 | 959 | static void link_retransmit_failure(struct tipc_link *l_ptr, |
ae8509c4 | 960 | struct sk_buff *buf) |
d356eeba AS |
961 | { |
962 | struct tipc_msg *msg = buf_msg(buf); | |
1da46568 | 963 | struct net *net = l_ptr->owner->net; |
d356eeba | 964 | |
2cf8aa19 | 965 | pr_warn("Retransmission failure on link <%s>\n", l_ptr->name); |
d356eeba AS |
966 | |
967 | if (l_ptr->addr) { | |
d356eeba | 968 | /* Handle failure on standard link */ |
8d64a5ba | 969 | link_print(l_ptr, "Resetting link\n"); |
d356eeba AS |
970 | tipc_link_reset(l_ptr); |
971 | ||
972 | } else { | |
d356eeba | 973 | /* Handle failure on broadcast link */ |
6c00055a | 974 | struct tipc_node *n_ptr; |
d356eeba AS |
975 | char addr_string[16]; |
976 | ||
2cf8aa19 EH |
977 | pr_info("Msg seq number: %u, ", msg_seqno(msg)); |
978 | pr_cont("Outstanding acks: %lu\n", | |
979 | (unsigned long) TIPC_SKB_CB(buf)->handle); | |
617dbeaa | 980 | |
1da46568 | 981 | n_ptr = tipc_bclink_retransmit_to(net); |
d356eeba AS |
982 | tipc_node_lock(n_ptr); |
983 | ||
c68ca7b7 | 984 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 | 985 | pr_info("Broadcast link info for %s\n", addr_string); |
389dd9bc YX |
986 | pr_info("Reception permitted: %d, Acked: %u\n", |
987 | n_ptr->bclink.recv_permitted, | |
2cf8aa19 EH |
988 | n_ptr->bclink.acked); |
989 | pr_info("Last in: %u, Oos state: %u, Last sent: %u\n", | |
990 | n_ptr->bclink.last_in, | |
991 | n_ptr->bclink.oos_state, | |
992 | n_ptr->bclink.last_sent); | |
d356eeba | 993 | |
d356eeba AS |
994 | tipc_node_unlock(n_ptr); |
995 | ||
1da46568 | 996 | tipc_bclink_set_flags(net, TIPC_BCLINK_RESET); |
d356eeba AS |
997 | l_ptr->stale_count = 0; |
998 | } | |
999 | } | |
1000 | ||
58dc55f2 | 1001 | void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, |
4323add6 | 1002 | u32 retransmits) |
b97bf3fd PL |
1003 | { |
1004 | struct tipc_msg *msg; | |
1005 | ||
58dc55f2 | 1006 | if (!skb) |
d356eeba AS |
1007 | return; |
1008 | ||
58dc55f2 | 1009 | msg = buf_msg(skb); |
c4307285 | 1010 | |
512137ee EH |
1011 | /* Detect repeated retransmit failures */ |
1012 | if (l_ptr->last_retransmitted == msg_seqno(msg)) { | |
1013 | if (++l_ptr->stale_count > 100) { | |
58dc55f2 | 1014 | link_retransmit_failure(l_ptr, skb); |
512137ee | 1015 | return; |
d356eeba AS |
1016 | } |
1017 | } else { | |
512137ee EH |
1018 | l_ptr->last_retransmitted = msg_seqno(msg); |
1019 | l_ptr->stale_count = 1; | |
b97bf3fd | 1020 | } |
d356eeba | 1021 | |
58dc55f2 YX |
1022 | skb_queue_walk_from(&l_ptr->outqueue, skb) { |
1023 | if (!retransmits || skb == l_ptr->next_out) | |
1024 | break; | |
1025 | msg = buf_msg(skb); | |
b97bf3fd | 1026 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); |
c4307285 | 1027 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
7f9f95d9 YX |
1028 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, |
1029 | &l_ptr->media_addr); | |
3c294cb3 YX |
1030 | retransmits--; |
1031 | l_ptr->stats.retransmitted++; | |
b97bf3fd | 1032 | } |
b97bf3fd PL |
1033 | } |
1034 | ||
f03273f1 YX |
1035 | static void link_retrieve_defq(struct tipc_link *link, |
1036 | struct sk_buff_head *list) | |
b97bf3fd PL |
1037 | { |
1038 | u32 seq_no; | |
1039 | ||
f03273f1 YX |
1040 | if (skb_queue_empty(&link->deferred_queue)) |
1041 | return; | |
1042 | ||
1043 | seq_no = buf_seqno(skb_peek(&link->deferred_queue)); | |
1044 | if (seq_no == mod(link->next_in_no)) | |
1045 | skb_queue_splice_tail_init(&link->deferred_queue, list); | |
b97bf3fd PL |
1046 | } |
1047 | ||
85035568 AS |
1048 | /** |
1049 | * link_recv_buf_validate - validate basic format of received message | |
1050 | * | |
1051 | * This routine ensures a TIPC message has an acceptable header, and at least | |
1052 | * as much data as the header indicates it should. The routine also ensures | |
1053 | * that the entire message header is stored in the main fragment of the message | |
1054 | * buffer, to simplify future access to message header fields. | |
1055 | * | |
1056 | * Note: Having extra info present in the message header or data areas is OK. | |
1057 | * TIPC will ignore the excess, under the assumption that it is optional info | |
1058 | * introduced by a later release of the protocol. | |
1059 | */ | |
85035568 AS |
1060 | static int link_recv_buf_validate(struct sk_buff *buf) |
1061 | { | |
1062 | static u32 min_data_hdr_size[8] = { | |
741d9eb7 | 1063 | SHORT_H_SIZE, MCAST_H_SIZE, NAMED_H_SIZE, BASIC_H_SIZE, |
85035568 AS |
1064 | MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE |
1065 | }; | |
1066 | ||
1067 | struct tipc_msg *msg; | |
1068 | u32 tipc_hdr[2]; | |
1069 | u32 size; | |
1070 | u32 hdr_size; | |
1071 | u32 min_hdr_size; | |
1072 | ||
64380a04 EH |
1073 | /* If this packet comes from the defer queue, the skb has already |
1074 | * been validated | |
1075 | */ | |
1076 | if (unlikely(TIPC_SKB_CB(buf)->deferred)) | |
1077 | return 1; | |
1078 | ||
85035568 AS |
1079 | if (unlikely(buf->len < MIN_H_SIZE)) |
1080 | return 0; | |
1081 | ||
1082 | msg = skb_header_pointer(buf, 0, sizeof(tipc_hdr), tipc_hdr); | |
1083 | if (msg == NULL) | |
1084 | return 0; | |
1085 | ||
1086 | if (unlikely(msg_version(msg) != TIPC_VERSION)) | |
1087 | return 0; | |
1088 | ||
1089 | size = msg_size(msg); | |
1090 | hdr_size = msg_hdr_sz(msg); | |
1091 | min_hdr_size = msg_isdata(msg) ? | |
1092 | min_data_hdr_size[msg_type(msg)] : INT_H_SIZE; | |
1093 | ||
1094 | if (unlikely((hdr_size < min_hdr_size) || | |
1095 | (size < hdr_size) || | |
1096 | (buf->len < size) || | |
1097 | (size - hdr_size > TIPC_MAX_USER_MSG_SIZE))) | |
1098 | return 0; | |
1099 | ||
1100 | return pskb_may_pull(buf, hdr_size); | |
1101 | } | |
1102 | ||
b02b69c8 | 1103 | /** |
170b3927 | 1104 | * tipc_rcv - process TIPC packets/messages arriving from off-node |
f2f9800d | 1105 | * @net: the applicable net namespace |
f03273f1 | 1106 | * @skb: TIPC packet |
7a2f7d18 | 1107 | * @b_ptr: pointer to bearer message arrived on |
b02b69c8 AS |
1108 | * |
1109 | * Invoked with no locks held. Bearer pointer must point to a valid bearer | |
1110 | * structure (i.e. cannot be NULL), but bearer can be inactive. | |
1111 | */ | |
c93d3baa | 1112 | void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) |
b97bf3fd | 1113 | { |
34747539 | 1114 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
f03273f1 YX |
1115 | struct sk_buff_head head; |
1116 | struct tipc_node *n_ptr; | |
1117 | struct tipc_link *l_ptr; | |
1118 | struct sk_buff *skb1, *tmp; | |
1119 | struct tipc_msg *msg; | |
1120 | u32 seq_no; | |
1121 | u32 ackd; | |
1122 | u32 released; | |
b97bf3fd | 1123 | |
a6ca1094 | 1124 | skb2list(skb, &head); |
85035568 | 1125 | |
f03273f1 | 1126 | while ((skb = __skb_dequeue(&head))) { |
85035568 | 1127 | /* Ensure message is well-formed */ |
f03273f1 | 1128 | if (unlikely(!link_recv_buf_validate(skb))) |
3af390e2 | 1129 | goto discard; |
b97bf3fd | 1130 | |
fe13dda2 | 1131 | /* Ensure message data is a single contiguous unit */ |
f03273f1 | 1132 | if (unlikely(skb_linearize(skb))) |
3af390e2 | 1133 | goto discard; |
fe13dda2 | 1134 | |
85035568 | 1135 | /* Handle arrival of a non-unicast link message */ |
f03273f1 | 1136 | msg = buf_msg(skb); |
85035568 | 1137 | |
b97bf3fd | 1138 | if (unlikely(msg_non_seq(msg))) { |
1265a021 | 1139 | if (msg_user(msg) == LINK_CONFIG) |
c93d3baa | 1140 | tipc_disc_rcv(net, skb, b_ptr); |
1265a021 | 1141 | else |
c93d3baa | 1142 | tipc_bclink_rcv(net, skb); |
b97bf3fd PL |
1143 | continue; |
1144 | } | |
c4307285 | 1145 | |
ed33a9c4 | 1146 | /* Discard unicast link messages destined for another node */ |
26008247 | 1147 | if (unlikely(!msg_short(msg) && |
34747539 | 1148 | (msg_destnode(msg) != tn->own_addr))) |
3af390e2 | 1149 | goto discard; |
c4307285 | 1150 | |
5a68d5ee | 1151 | /* Locate neighboring node that sent message */ |
f2f9800d | 1152 | n_ptr = tipc_node_find(net, msg_prevnode(msg)); |
b97bf3fd | 1153 | if (unlikely(!n_ptr)) |
3af390e2 | 1154 | goto discard; |
4323add6 | 1155 | tipc_node_lock(n_ptr); |
85035568 | 1156 | |
b4b56102 | 1157 | /* Locate unicast link endpoint that should handle message */ |
b4b56102 | 1158 | l_ptr = n_ptr->links[b_ptr->identity]; |
3af390e2 | 1159 | if (unlikely(!l_ptr)) |
c637c103 | 1160 | goto unlock; |
5a68d5ee | 1161 | |
b4b56102 | 1162 | /* Verify that communication with node is currently allowed */ |
aecb9bb8 | 1163 | if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) && |
10f465c4 YX |
1164 | msg_user(msg) == LINK_PROTOCOL && |
1165 | (msg_type(msg) == RESET_MSG || | |
1166 | msg_type(msg) == ACTIVATE_MSG) && | |
1167 | !msg_redundant_link(msg)) | |
aecb9bb8 | 1168 | n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN; |
10f465c4 YX |
1169 | |
1170 | if (tipc_node_blocked(n_ptr)) | |
c637c103 | 1171 | goto unlock; |
85035568 AS |
1172 | |
1173 | /* Validate message sequence number info */ | |
85035568 AS |
1174 | seq_no = msg_seqno(msg); |
1175 | ackd = msg_ack(msg); | |
1176 | ||
1177 | /* Release acked messages */ | |
389dd9bc | 1178 | if (n_ptr->bclink.recv_permitted) |
36559591 | 1179 | tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg)); |
b97bf3fd | 1180 | |
58dc55f2 YX |
1181 | released = 0; |
1182 | skb_queue_walk_safe(&l_ptr->outqueue, skb1, tmp) { | |
1183 | if (skb1 == l_ptr->next_out || | |
1184 | more(buf_seqno(skb1), ackd)) | |
1185 | break; | |
1186 | __skb_unlink(skb1, &l_ptr->outqueue); | |
1187 | kfree_skb(skb1); | |
1188 | released = 1; | |
b97bf3fd | 1189 | } |
85035568 AS |
1190 | |
1191 | /* Try sending any messages link endpoint has pending */ | |
b97bf3fd | 1192 | if (unlikely(l_ptr->next_out)) |
47b4c9a8 | 1193 | tipc_link_push_packets(l_ptr); |
a5377831 | 1194 | |
c637c103 | 1195 | if (released && !skb_queue_empty(&l_ptr->wakeupq)) |
50100a5e | 1196 | link_prepare_wakeup(l_ptr); |
a5377831 | 1197 | |
a5377831 | 1198 | /* Process the incoming packet */ |
3af390e2 YX |
1199 | if (unlikely(!link_working_working(l_ptr))) { |
1200 | if (msg_user(msg) == LINK_PROTOCOL) { | |
c5898636 | 1201 | tipc_link_proto_rcv(l_ptr, skb); |
f03273f1 | 1202 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1203 | skb = NULL; |
1204 | goto unlock; | |
b97bf3fd | 1205 | } |
3af390e2 YX |
1206 | |
1207 | /* Traffic message. Conditionally activate link */ | |
1208 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); | |
1209 | ||
1210 | if (link_working_working(l_ptr)) { | |
1211 | /* Re-insert buffer in front of queue */ | |
f03273f1 | 1212 | __skb_queue_head(&head, skb); |
c637c103 JPM |
1213 | skb = NULL; |
1214 | goto unlock; | |
3af390e2 | 1215 | } |
c637c103 | 1216 | goto unlock; |
3af390e2 YX |
1217 | } |
1218 | ||
1219 | /* Link is now in state WORKING_WORKING */ | |
1220 | if (unlikely(seq_no != mod(l_ptr->next_in_no))) { | |
c5898636 | 1221 | link_handle_out_of_seq_msg(l_ptr, skb); |
f03273f1 | 1222 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1223 | skb = NULL; |
1224 | goto unlock; | |
b97bf3fd | 1225 | } |
3af390e2 | 1226 | l_ptr->next_in_no++; |
bc6fecd4 | 1227 | if (unlikely(!skb_queue_empty(&l_ptr->deferred_queue))) |
f03273f1 | 1228 | link_retrieve_defq(l_ptr, &head); |
a5377831 | 1229 | |
3f53bd8f EH |
1230 | if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) { |
1231 | l_ptr->stats.sent_acks++; | |
1232 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); | |
1233 | } | |
c637c103 JPM |
1234 | tipc_link_input(l_ptr, skb); |
1235 | skb = NULL; | |
1236 | unlock: | |
3af390e2 YX |
1237 | tipc_node_unlock(n_ptr); |
1238 | discard: | |
c637c103 JPM |
1239 | if (unlikely(skb)) |
1240 | kfree_skb(skb); | |
b97bf3fd | 1241 | } |
b97bf3fd PL |
1242 | } |
1243 | ||
c637c103 | 1244 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1245 | * |
c637c103 | 1246 | * Consumes buffer if message is of right type |
7ae934be EH |
1247 | * Node lock must be held |
1248 | */ | |
c637c103 | 1249 | static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1250 | { |
c637c103 JPM |
1251 | struct tipc_node *node = link->owner; |
1252 | struct tipc_msg *msg = buf_msg(skb); | |
1253 | u32 dport = msg_destport(msg); | |
7ae934be | 1254 | |
7ae934be | 1255 | switch (msg_user(msg)) { |
c637c103 JPM |
1256 | case TIPC_LOW_IMPORTANCE: |
1257 | case TIPC_MEDIUM_IMPORTANCE: | |
1258 | case TIPC_HIGH_IMPORTANCE: | |
1259 | case TIPC_CRITICAL_IMPORTANCE: | |
1260 | case CONN_MANAGER: | |
1261 | if (tipc_skb_queue_tail(&link->inputq, skb, dport)) { | |
1262 | node->inputq = &link->inputq; | |
1263 | node->action_flags |= TIPC_MSG_EVT; | |
7ae934be | 1264 | } |
c637c103 | 1265 | return true; |
7ae934be | 1266 | case NAME_DISTRIBUTOR: |
c637c103 JPM |
1267 | node->bclink.recv_permitted = true; |
1268 | node->namedq = &link->namedq; | |
1269 | skb_queue_tail(&link->namedq, skb); | |
1270 | if (skb_queue_len(&link->namedq) == 1) | |
1271 | node->action_flags |= TIPC_NAMED_MSG_EVT; | |
1272 | return true; | |
1273 | case MSG_BUNDLER: | |
1274 | case CHANGEOVER_PROTOCOL: | |
1275 | case MSG_FRAGMENTER: | |
7ae934be | 1276 | case BCAST_PROTOCOL: |
c637c103 | 1277 | return false; |
7ae934be | 1278 | default: |
c637c103 JPM |
1279 | pr_warn("Dropping received illegal msg type\n"); |
1280 | kfree_skb(skb); | |
1281 | return false; | |
1282 | }; | |
7ae934be | 1283 | } |
c637c103 JPM |
1284 | |
1285 | /* tipc_link_input - process packet that has passed link protocol check | |
1286 | * | |
1287 | * Consumes buffer | |
1288 | * Node lock must be held | |
7ae934be | 1289 | */ |
c637c103 | 1290 | static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1291 | { |
c637c103 JPM |
1292 | struct tipc_node *node = link->owner; |
1293 | struct tipc_msg *msg = buf_msg(skb); | |
1294 | struct sk_buff *iskb; | |
1295 | int pos = 0; | |
1296 | ||
1297 | if (likely(tipc_data_input(link, skb))) | |
1298 | return; | |
7ae934be EH |
1299 | |
1300 | switch (msg_user(msg)) { | |
c637c103 JPM |
1301 | case CHANGEOVER_PROTOCOL: |
1302 | if (!tipc_link_tunnel_rcv(node, &skb)) | |
1303 | break; | |
1304 | if (msg_user(buf_msg(skb)) != MSG_BUNDLER) { | |
1305 | tipc_data_input(link, skb); | |
1306 | break; | |
1307 | } | |
1308 | case MSG_BUNDLER: | |
1309 | link->stats.recv_bundles++; | |
1310 | link->stats.recv_bundled += msg_msgcnt(msg); | |
1311 | ||
1312 | while (tipc_msg_extract(skb, &iskb, &pos)) | |
1313 | tipc_data_input(link, iskb); | |
7ae934be | 1314 | break; |
c637c103 JPM |
1315 | case MSG_FRAGMENTER: |
1316 | link->stats.recv_fragments++; | |
1317 | if (tipc_buf_append(&link->reasm_buf, &skb)) { | |
1318 | link->stats.recv_fragmented++; | |
1319 | tipc_data_input(link, skb); | |
1320 | } else if (!link->reasm_buf) { | |
1321 | tipc_link_reset(link); | |
1322 | } | |
7ae934be | 1323 | break; |
c637c103 JPM |
1324 | case BCAST_PROTOCOL: |
1325 | tipc_link_sync_rcv(node, skb); | |
7ae934be EH |
1326 | break; |
1327 | default: | |
c637c103 JPM |
1328 | break; |
1329 | }; | |
7ae934be EH |
1330 | } |
1331 | ||
2c53040f | 1332 | /** |
8809b255 AS |
1333 | * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue |
1334 | * | |
1335 | * Returns increase in queue length (i.e. 0 or 1) | |
b97bf3fd | 1336 | */ |
bc6fecd4 | 1337 | u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) |
b97bf3fd | 1338 | { |
bc6fecd4 YX |
1339 | struct sk_buff *skb1; |
1340 | u32 seq_no = buf_seqno(skb); | |
b97bf3fd PL |
1341 | |
1342 | /* Empty queue ? */ | |
bc6fecd4 YX |
1343 | if (skb_queue_empty(list)) { |
1344 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1345 | return 1; |
1346 | } | |
1347 | ||
1348 | /* Last ? */ | |
bc6fecd4 YX |
1349 | if (less(buf_seqno(skb_peek_tail(list)), seq_no)) { |
1350 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1351 | return 1; |
1352 | } | |
1353 | ||
8809b255 | 1354 | /* Locate insertion point in queue, then insert; discard if duplicate */ |
bc6fecd4 YX |
1355 | skb_queue_walk(list, skb1) { |
1356 | u32 curr_seqno = buf_seqno(skb1); | |
b97bf3fd | 1357 | |
8809b255 | 1358 | if (seq_no == curr_seqno) { |
bc6fecd4 | 1359 | kfree_skb(skb); |
8809b255 | 1360 | return 0; |
b97bf3fd | 1361 | } |
8809b255 AS |
1362 | |
1363 | if (less(seq_no, curr_seqno)) | |
b97bf3fd | 1364 | break; |
8809b255 | 1365 | } |
b97bf3fd | 1366 | |
bc6fecd4 | 1367 | __skb_queue_before(list, skb1, skb); |
8809b255 | 1368 | return 1; |
b97bf3fd PL |
1369 | } |
1370 | ||
8809b255 | 1371 | /* |
b97bf3fd PL |
1372 | * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet |
1373 | */ | |
c5898636 | 1374 | static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr, |
b97bf3fd PL |
1375 | struct sk_buff *buf) |
1376 | { | |
f905730c | 1377 | u32 seq_no = buf_seqno(buf); |
b97bf3fd PL |
1378 | |
1379 | if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) { | |
c5898636 | 1380 | tipc_link_proto_rcv(l_ptr, buf); |
b97bf3fd PL |
1381 | return; |
1382 | } | |
1383 | ||
b97bf3fd | 1384 | /* Record OOS packet arrival (force mismatch on next timeout) */ |
b97bf3fd PL |
1385 | l_ptr->checkpoint--; |
1386 | ||
c4307285 | 1387 | /* |
b97bf3fd PL |
1388 | * Discard packet if a duplicate; otherwise add it to deferred queue |
1389 | * and notify peer of gap as per protocol specification | |
1390 | */ | |
b97bf3fd PL |
1391 | if (less(seq_no, mod(l_ptr->next_in_no))) { |
1392 | l_ptr->stats.duplicates++; | |
5f6d9123 | 1393 | kfree_skb(buf); |
b97bf3fd PL |
1394 | return; |
1395 | } | |
1396 | ||
bc6fecd4 | 1397 | if (tipc_link_defer_pkt(&l_ptr->deferred_queue, buf)) { |
b97bf3fd | 1398 | l_ptr->stats.deferred_recv++; |
64380a04 | 1399 | TIPC_SKB_CB(buf)->deferred = true; |
bc6fecd4 | 1400 | if ((skb_queue_len(&l_ptr->deferred_queue) % 16) == 1) |
247f0f3c | 1401 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); |
bc6fecd4 | 1402 | } else { |
b97bf3fd | 1403 | l_ptr->stats.duplicates++; |
bc6fecd4 | 1404 | } |
b97bf3fd PL |
1405 | } |
1406 | ||
1407 | /* | |
1408 | * Send protocol message to the other endpoint. | |
1409 | */ | |
247f0f3c YX |
1410 | void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg, |
1411 | u32 gap, u32 tolerance, u32 priority, u32 ack_mtu) | |
b97bf3fd | 1412 | { |
1fc54d8f | 1413 | struct sk_buff *buf = NULL; |
b97bf3fd | 1414 | struct tipc_msg *msg = l_ptr->pmsg; |
c4307285 | 1415 | u32 msg_size = sizeof(l_ptr->proto_msg); |
75f0aa49 | 1416 | int r_flag; |
b97bf3fd | 1417 | |
77a7e07a YX |
1418 | /* Don't send protocol message during link changeover */ |
1419 | if (l_ptr->exp_msg_count) | |
b97bf3fd | 1420 | return; |
b4b56102 AS |
1421 | |
1422 | /* Abort non-RESET send if communication with node is prohibited */ | |
10f465c4 | 1423 | if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG)) |
b4b56102 AS |
1424 | return; |
1425 | ||
92d2c905 | 1426 | /* Create protocol message with "out-of-sequence" sequence number */ |
b97bf3fd | 1427 | msg_set_type(msg, msg_typ); |
7a2f7d18 | 1428 | msg_set_net_plane(msg, l_ptr->net_plane); |
7a54d4a9 | 1429 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
1da46568 | 1430 | msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net)); |
b97bf3fd PL |
1431 | |
1432 | if (msg_typ == STATE_MSG) { | |
1433 | u32 next_sent = mod(l_ptr->next_out_no); | |
1434 | ||
4323add6 | 1435 | if (!tipc_link_is_up(l_ptr)) |
b97bf3fd PL |
1436 | return; |
1437 | if (l_ptr->next_out) | |
f905730c | 1438 | next_sent = buf_seqno(l_ptr->next_out); |
b97bf3fd | 1439 | msg_set_next_sent(msg, next_sent); |
bc6fecd4 YX |
1440 | if (!skb_queue_empty(&l_ptr->deferred_queue)) { |
1441 | u32 rec = buf_seqno(skb_peek(&l_ptr->deferred_queue)); | |
b97bf3fd PL |
1442 | gap = mod(rec - mod(l_ptr->next_in_no)); |
1443 | } | |
1444 | msg_set_seq_gap(msg, gap); | |
1445 | if (gap) | |
1446 | l_ptr->stats.sent_nacks++; | |
1447 | msg_set_link_tolerance(msg, tolerance); | |
1448 | msg_set_linkprio(msg, priority); | |
1449 | msg_set_max_pkt(msg, ack_mtu); | |
1450 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); | |
1451 | msg_set_probe(msg, probe_msg != 0); | |
c4307285 | 1452 | if (probe_msg) { |
b97bf3fd PL |
1453 | u32 mtu = l_ptr->max_pkt; |
1454 | ||
c4307285 | 1455 | if ((mtu < l_ptr->max_pkt_target) && |
b97bf3fd PL |
1456 | link_working_working(l_ptr) && |
1457 | l_ptr->fsm_msg_cnt) { | |
1458 | msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3; | |
c4307285 YH |
1459 | if (l_ptr->max_pkt_probes == 10) { |
1460 | l_ptr->max_pkt_target = (msg_size - 4); | |
1461 | l_ptr->max_pkt_probes = 0; | |
b97bf3fd | 1462 | msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3; |
c4307285 | 1463 | } |
b97bf3fd | 1464 | l_ptr->max_pkt_probes++; |
c4307285 | 1465 | } |
b97bf3fd PL |
1466 | |
1467 | l_ptr->stats.sent_probes++; | |
c4307285 | 1468 | } |
b97bf3fd PL |
1469 | l_ptr->stats.sent_states++; |
1470 | } else { /* RESET_MSG or ACTIVATE_MSG */ | |
1471 | msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1)); | |
1472 | msg_set_seq_gap(msg, 0); | |
1473 | msg_set_next_sent(msg, 1); | |
f23d9bf2 | 1474 | msg_set_probe(msg, 0); |
b97bf3fd PL |
1475 | msg_set_link_tolerance(msg, l_ptr->tolerance); |
1476 | msg_set_linkprio(msg, l_ptr->priority); | |
1477 | msg_set_max_pkt(msg, l_ptr->max_pkt_target); | |
1478 | } | |
1479 | ||
75f0aa49 AS |
1480 | r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr)); |
1481 | msg_set_redundant_link(msg, r_flag); | |
b97bf3fd | 1482 | msg_set_linkprio(msg, l_ptr->priority); |
92d2c905 | 1483 | msg_set_size(msg, msg_size); |
b97bf3fd PL |
1484 | |
1485 | msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2))); | |
1486 | ||
31e3c3f6 | 1487 | buf = tipc_buf_acquire(msg_size); |
b97bf3fd PL |
1488 | if (!buf) |
1489 | return; | |
1490 | ||
27d7ff46 | 1491 | skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg)); |
796c75d0 | 1492 | buf->priority = TC_PRIO_CONTROL; |
b97bf3fd | 1493 | |
7f9f95d9 YX |
1494 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf, |
1495 | &l_ptr->media_addr); | |
92d2c905 | 1496 | l_ptr->unacked_window = 0; |
5f6d9123 | 1497 | kfree_skb(buf); |
b97bf3fd PL |
1498 | } |
1499 | ||
1500 | /* | |
1501 | * Receive protocol message : | |
c4307285 YH |
1502 | * Note that network plane id propagates through the network, and may |
1503 | * change at any time. The node with lowest address rules | |
b97bf3fd | 1504 | */ |
c5898636 | 1505 | static void tipc_link_proto_rcv(struct tipc_link *l_ptr, |
c93d3baa | 1506 | struct sk_buff *buf) |
b97bf3fd PL |
1507 | { |
1508 | u32 rec_gap = 0; | |
1509 | u32 max_pkt_info; | |
c4307285 | 1510 | u32 max_pkt_ack; |
b97bf3fd PL |
1511 | u32 msg_tol; |
1512 | struct tipc_msg *msg = buf_msg(buf); | |
1513 | ||
77a7e07a YX |
1514 | /* Discard protocol message during link changeover */ |
1515 | if (l_ptr->exp_msg_count) | |
b97bf3fd PL |
1516 | goto exit; |
1517 | ||
7a2f7d18 | 1518 | if (l_ptr->net_plane != msg_net_plane(msg)) |
c5898636 | 1519 | if (link_own_addr(l_ptr) > msg_prevnode(msg)) |
7a2f7d18 | 1520 | l_ptr->net_plane = msg_net_plane(msg); |
b97bf3fd | 1521 | |
b97bf3fd | 1522 | switch (msg_type(msg)) { |
c4307285 | 1523 | |
b97bf3fd | 1524 | case RESET_MSG: |
a686e685 AS |
1525 | if (!link_working_unknown(l_ptr) && |
1526 | (l_ptr->peer_session != INVALID_SESSION)) { | |
641c218d AS |
1527 | if (less_eq(msg_session(msg), l_ptr->peer_session)) |
1528 | break; /* duplicate or old reset: ignore */ | |
b97bf3fd | 1529 | } |
b4b56102 AS |
1530 | |
1531 | if (!msg_redundant_link(msg) && (link_working_working(l_ptr) || | |
1532 | link_working_unknown(l_ptr))) { | |
1533 | /* | |
1534 | * peer has lost contact -- don't allow peer's links | |
1535 | * to reactivate before we recognize loss & clean up | |
1536 | */ | |
ca9cf06a | 1537 | l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN; |
b4b56102 AS |
1538 | } |
1539 | ||
47361c87 AS |
1540 | link_state_event(l_ptr, RESET_MSG); |
1541 | ||
b97bf3fd PL |
1542 | /* fall thru' */ |
1543 | case ACTIVATE_MSG: | |
1544 | /* Update link settings according other endpoint's values */ | |
b97bf3fd PL |
1545 | strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg)); |
1546 | ||
2db9983a AS |
1547 | msg_tol = msg_link_tolerance(msg); |
1548 | if (msg_tol > l_ptr->tolerance) | |
b97bf3fd PL |
1549 | link_set_supervision_props(l_ptr, msg_tol); |
1550 | ||
1551 | if (msg_linkprio(msg) > l_ptr->priority) | |
1552 | l_ptr->priority = msg_linkprio(msg); | |
1553 | ||
1554 | max_pkt_info = msg_max_pkt(msg); | |
c4307285 | 1555 | if (max_pkt_info) { |
b97bf3fd PL |
1556 | if (max_pkt_info < l_ptr->max_pkt_target) |
1557 | l_ptr->max_pkt_target = max_pkt_info; | |
1558 | if (l_ptr->max_pkt > l_ptr->max_pkt_target) | |
1559 | l_ptr->max_pkt = l_ptr->max_pkt_target; | |
1560 | } else { | |
c4307285 | 1561 | l_ptr->max_pkt = l_ptr->max_pkt_target; |
b97bf3fd | 1562 | } |
b97bf3fd | 1563 | |
4d75313c | 1564 | /* Synchronize broadcast link info, if not done previously */ |
7a54d4a9 AS |
1565 | if (!tipc_node_is_up(l_ptr->owner)) { |
1566 | l_ptr->owner->bclink.last_sent = | |
1567 | l_ptr->owner->bclink.last_in = | |
1568 | msg_last_bcast(msg); | |
1569 | l_ptr->owner->bclink.oos_state = 0; | |
1570 | } | |
4d75313c | 1571 | |
b97bf3fd PL |
1572 | l_ptr->peer_session = msg_session(msg); |
1573 | l_ptr->peer_bearer_id = msg_bearer_id(msg); | |
47361c87 AS |
1574 | |
1575 | if (msg_type(msg) == ACTIVATE_MSG) | |
1576 | link_state_event(l_ptr, ACTIVATE_MSG); | |
b97bf3fd PL |
1577 | break; |
1578 | case STATE_MSG: | |
1579 | ||
2db9983a AS |
1580 | msg_tol = msg_link_tolerance(msg); |
1581 | if (msg_tol) | |
b97bf3fd | 1582 | link_set_supervision_props(l_ptr, msg_tol); |
c4307285 YH |
1583 | |
1584 | if (msg_linkprio(msg) && | |
b97bf3fd | 1585 | (msg_linkprio(msg) != l_ptr->priority)) { |
3fa9cacd EH |
1586 | pr_debug("%s<%s>, priority change %u->%u\n", |
1587 | link_rst_msg, l_ptr->name, | |
1588 | l_ptr->priority, msg_linkprio(msg)); | |
b97bf3fd | 1589 | l_ptr->priority = msg_linkprio(msg); |
4323add6 | 1590 | tipc_link_reset(l_ptr); /* Enforce change to take effect */ |
b97bf3fd PL |
1591 | break; |
1592 | } | |
ec37dcd3 JPM |
1593 | |
1594 | /* Record reception; force mismatch at next timeout: */ | |
1595 | l_ptr->checkpoint--; | |
1596 | ||
b97bf3fd PL |
1597 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); |
1598 | l_ptr->stats.recv_states++; | |
1599 | if (link_reset_unknown(l_ptr)) | |
1600 | break; | |
1601 | ||
1602 | if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) { | |
c4307285 | 1603 | rec_gap = mod(msg_next_sent(msg) - |
b97bf3fd PL |
1604 | mod(l_ptr->next_in_no)); |
1605 | } | |
1606 | ||
1607 | max_pkt_ack = msg_max_pkt(msg); | |
c4307285 | 1608 | if (max_pkt_ack > l_ptr->max_pkt) { |
c4307285 YH |
1609 | l_ptr->max_pkt = max_pkt_ack; |
1610 | l_ptr->max_pkt_probes = 0; | |
1611 | } | |
b97bf3fd PL |
1612 | |
1613 | max_pkt_ack = 0; | |
c4307285 | 1614 | if (msg_probe(msg)) { |
b97bf3fd | 1615 | l_ptr->stats.recv_probes++; |
a016892c | 1616 | if (msg_size(msg) > sizeof(l_ptr->proto_msg)) |
c4307285 | 1617 | max_pkt_ack = msg_size(msg); |
c4307285 | 1618 | } |
b97bf3fd PL |
1619 | |
1620 | /* Protocol message before retransmits, reduce loss risk */ | |
389dd9bc | 1621 | if (l_ptr->owner->bclink.recv_permitted) |
c5898636 | 1622 | tipc_bclink_update_link_state(l_ptr->owner, |
7a54d4a9 | 1623 | msg_last_bcast(msg)); |
b97bf3fd PL |
1624 | |
1625 | if (rec_gap || (msg_probe(msg))) { | |
247f0f3c YX |
1626 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, rec_gap, 0, |
1627 | 0, max_pkt_ack); | |
b97bf3fd PL |
1628 | } |
1629 | if (msg_seq_gap(msg)) { | |
b97bf3fd | 1630 | l_ptr->stats.recv_nacks++; |
58dc55f2 | 1631 | tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->outqueue), |
4323add6 | 1632 | msg_seq_gap(msg)); |
b97bf3fd PL |
1633 | } |
1634 | break; | |
b97bf3fd PL |
1635 | } |
1636 | exit: | |
5f6d9123 | 1637 | kfree_skb(buf); |
b97bf3fd PL |
1638 | } |
1639 | ||
1640 | ||
170b3927 JPM |
1641 | /* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to |
1642 | * a different bearer. Owner node is locked. | |
b97bf3fd | 1643 | */ |
170b3927 JPM |
1644 | static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr, |
1645 | struct tipc_msg *tunnel_hdr, | |
1646 | struct tipc_msg *msg, | |
1647 | u32 selector) | |
b97bf3fd | 1648 | { |
a18c4bc3 | 1649 | struct tipc_link *tunnel; |
a6ca1094 | 1650 | struct sk_buff *skb; |
b97bf3fd PL |
1651 | u32 length = msg_size(msg); |
1652 | ||
1653 | tunnel = l_ptr->owner->active_links[selector & 1]; | |
5392d646 | 1654 | if (!tipc_link_is_up(tunnel)) { |
2cf8aa19 | 1655 | pr_warn("%stunnel link no longer available\n", link_co_err); |
b97bf3fd | 1656 | return; |
5392d646 | 1657 | } |
b97bf3fd | 1658 | msg_set_size(tunnel_hdr, length + INT_H_SIZE); |
a6ca1094 YX |
1659 | skb = tipc_buf_acquire(length + INT_H_SIZE); |
1660 | if (!skb) { | |
2cf8aa19 | 1661 | pr_warn("%sunable to send tunnel msg\n", link_co_err); |
b97bf3fd | 1662 | return; |
5392d646 | 1663 | } |
a6ca1094 YX |
1664 | skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE); |
1665 | skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length); | |
1666 | __tipc_link_xmit_skb(tunnel, skb); | |
b97bf3fd PL |
1667 | } |
1668 | ||
1669 | ||
170b3927 JPM |
1670 | /* tipc_link_failover_send_queue(): A link has gone down, but a second |
1671 | * link is still active. We can do failover. Tunnel the failing link's | |
1672 | * whole send queue via the remaining link. This way, we don't lose | |
1673 | * any packets, and sequence order is preserved for subsequent traffic | |
1674 | * sent over the remaining link. Owner node is locked. | |
b97bf3fd | 1675 | */ |
170b3927 | 1676 | void tipc_link_failover_send_queue(struct tipc_link *l_ptr) |
b97bf3fd | 1677 | { |
58dc55f2 | 1678 | u32 msgcount = skb_queue_len(&l_ptr->outqueue); |
a18c4bc3 | 1679 | struct tipc_link *tunnel = l_ptr->owner->active_links[0]; |
b97bf3fd | 1680 | struct tipc_msg tunnel_hdr; |
58dc55f2 | 1681 | struct sk_buff *skb; |
5392d646 | 1682 | int split_bundles; |
b97bf3fd PL |
1683 | |
1684 | if (!tunnel) | |
1685 | return; | |
1686 | ||
c5898636 | 1687 | tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, CHANGEOVER_PROTOCOL, |
34747539 | 1688 | ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr); |
b97bf3fd PL |
1689 | msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); |
1690 | msg_set_msgcnt(&tunnel_hdr, msgcount); | |
f131072c | 1691 | |
58dc55f2 YX |
1692 | if (skb_queue_empty(&l_ptr->outqueue)) { |
1693 | skb = tipc_buf_acquire(INT_H_SIZE); | |
1694 | if (skb) { | |
1695 | skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE); | |
b97bf3fd | 1696 | msg_set_size(&tunnel_hdr, INT_H_SIZE); |
a6ca1094 | 1697 | __tipc_link_xmit_skb(tunnel, skb); |
b97bf3fd | 1698 | } else { |
2cf8aa19 EH |
1699 | pr_warn("%sunable to send changeover msg\n", |
1700 | link_co_err); | |
b97bf3fd PL |
1701 | } |
1702 | return; | |
1703 | } | |
f131072c | 1704 | |
c4307285 | 1705 | split_bundles = (l_ptr->owner->active_links[0] != |
5392d646 AS |
1706 | l_ptr->owner->active_links[1]); |
1707 | ||
58dc55f2 YX |
1708 | skb_queue_walk(&l_ptr->outqueue, skb) { |
1709 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
1710 | |
1711 | if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) { | |
b97bf3fd | 1712 | struct tipc_msg *m = msg_get_wrapped(msg); |
0e65967e | 1713 | unchar *pos = (unchar *)m; |
b97bf3fd | 1714 | |
d788d805 | 1715 | msgcount = msg_msgcnt(msg); |
b97bf3fd | 1716 | while (msgcount--) { |
0e65967e | 1717 | msg_set_seqno(m, msg_seqno(msg)); |
170b3927 JPM |
1718 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m, |
1719 | msg_link_selector(m)); | |
b97bf3fd PL |
1720 | pos += align(msg_size(m)); |
1721 | m = (struct tipc_msg *)pos; | |
1722 | } | |
1723 | } else { | |
170b3927 JPM |
1724 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg, |
1725 | msg_link_selector(msg)); | |
b97bf3fd | 1726 | } |
b97bf3fd PL |
1727 | } |
1728 | } | |
1729 | ||
247f0f3c | 1730 | /* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a |
170b3927 JPM |
1731 | * duplicate of the first link's send queue via the new link. This way, we |
1732 | * are guaranteed that currently queued packets from a socket are delivered | |
1733 | * before future traffic from the same socket, even if this is using the | |
1734 | * new link. The last arriving copy of each duplicate packet is dropped at | |
1735 | * the receiving end by the regular protocol check, so packet cardinality | |
1736 | * and sequence order is preserved per sender/receiver socket pair. | |
1737 | * Owner node is locked. | |
1738 | */ | |
247f0f3c | 1739 | void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr, |
170b3927 | 1740 | struct tipc_link *tunnel) |
b97bf3fd | 1741 | { |
58dc55f2 | 1742 | struct sk_buff *skb; |
b97bf3fd PL |
1743 | struct tipc_msg tunnel_hdr; |
1744 | ||
c5898636 | 1745 | tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, CHANGEOVER_PROTOCOL, |
34747539 | 1746 | DUPLICATE_MSG, INT_H_SIZE, l_ptr->addr); |
58dc55f2 | 1747 | msg_set_msgcnt(&tunnel_hdr, skb_queue_len(&l_ptr->outqueue)); |
b97bf3fd | 1748 | msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); |
58dc55f2 YX |
1749 | skb_queue_walk(&l_ptr->outqueue, skb) { |
1750 | struct sk_buff *outskb; | |
1751 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
1752 | u32 length = msg_size(msg); |
1753 | ||
1754 | if (msg_user(msg) == MSG_BUNDLER) | |
1755 | msg_set_type(msg, CLOSED_MSG); | |
1756 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */ | |
c4307285 | 1757 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
b97bf3fd | 1758 | msg_set_size(&tunnel_hdr, length + INT_H_SIZE); |
58dc55f2 YX |
1759 | outskb = tipc_buf_acquire(length + INT_H_SIZE); |
1760 | if (outskb == NULL) { | |
2cf8aa19 EH |
1761 | pr_warn("%sunable to send duplicate msg\n", |
1762 | link_co_err); | |
b97bf3fd PL |
1763 | return; |
1764 | } | |
58dc55f2 YX |
1765 | skb_copy_to_linear_data(outskb, &tunnel_hdr, INT_H_SIZE); |
1766 | skb_copy_to_linear_data_offset(outskb, INT_H_SIZE, skb->data, | |
27d7ff46 | 1767 | length); |
a6ca1094 | 1768 | __tipc_link_xmit_skb(tunnel, outskb); |
4323add6 | 1769 | if (!tipc_link_is_up(l_ptr)) |
b97bf3fd | 1770 | return; |
b97bf3fd PL |
1771 | } |
1772 | } | |
1773 | ||
b97bf3fd PL |
1774 | /** |
1775 | * buf_extract - extracts embedded TIPC message from another message | |
1776 | * @skb: encapsulating message buffer | |
1777 | * @from_pos: offset to extract from | |
1778 | * | |
c4307285 | 1779 | * Returns a new message buffer containing an embedded message. The |
c637c103 | 1780 | * encapsulating buffer is left unchanged. |
b97bf3fd | 1781 | */ |
b97bf3fd PL |
1782 | static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos) |
1783 | { | |
1784 | struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos); | |
1785 | u32 size = msg_size(msg); | |
1786 | struct sk_buff *eb; | |
1787 | ||
31e3c3f6 | 1788 | eb = tipc_buf_acquire(size); |
b97bf3fd | 1789 | if (eb) |
27d7ff46 | 1790 | skb_copy_to_linear_data(eb, msg, size); |
b97bf3fd PL |
1791 | return eb; |
1792 | } | |
1793 | ||
1dab3d5a JPM |
1794 | /* tipc_link_dup_rcv(): Receive a tunnelled DUPLICATE_MSG packet. |
1795 | * Owner node is locked. | |
1796 | */ | |
c5898636 | 1797 | static void tipc_link_dup_rcv(struct tipc_link *l_ptr, |
1dab3d5a JPM |
1798 | struct sk_buff *t_buf) |
1799 | { | |
1800 | struct sk_buff *buf; | |
1801 | ||
1802 | if (!tipc_link_is_up(l_ptr)) | |
1803 | return; | |
1804 | ||
1805 | buf = buf_extract(t_buf, INT_H_SIZE); | |
1806 | if (buf == NULL) { | |
1807 | pr_warn("%sfailed to extract inner dup pkt\n", link_co_err); | |
1808 | return; | |
1809 | } | |
1810 | ||
1811 | /* Add buffer to deferred queue, if applicable: */ | |
c5898636 | 1812 | link_handle_out_of_seq_msg(l_ptr, buf); |
1dab3d5a JPM |
1813 | } |
1814 | ||
f006c9c7 JPM |
1815 | /* tipc_link_failover_rcv(): Receive a tunnelled ORIGINAL_MSG packet |
1816 | * Owner node is locked. | |
1817 | */ | |
1818 | static struct sk_buff *tipc_link_failover_rcv(struct tipc_link *l_ptr, | |
1819 | struct sk_buff *t_buf) | |
1820 | { | |
1821 | struct tipc_msg *t_msg = buf_msg(t_buf); | |
1822 | struct sk_buff *buf = NULL; | |
1823 | struct tipc_msg *msg; | |
1824 | ||
1825 | if (tipc_link_is_up(l_ptr)) | |
1826 | tipc_link_reset(l_ptr); | |
1827 | ||
1828 | /* First failover packet? */ | |
1829 | if (l_ptr->exp_msg_count == START_CHANGEOVER) | |
1830 | l_ptr->exp_msg_count = msg_msgcnt(t_msg); | |
1831 | ||
1832 | /* Should there be an inner packet? */ | |
1833 | if (l_ptr->exp_msg_count) { | |
1834 | l_ptr->exp_msg_count--; | |
1835 | buf = buf_extract(t_buf, INT_H_SIZE); | |
1836 | if (buf == NULL) { | |
1837 | pr_warn("%sno inner failover pkt\n", link_co_err); | |
1838 | goto exit; | |
1839 | } | |
1840 | msg = buf_msg(buf); | |
1841 | ||
1842 | if (less(msg_seqno(msg), l_ptr->reset_checkpoint)) { | |
1843 | kfree_skb(buf); | |
1844 | buf = NULL; | |
1845 | goto exit; | |
1846 | } | |
1847 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
1848 | l_ptr->stats.recv_fragments++; | |
37e22164 | 1849 | tipc_buf_append(&l_ptr->reasm_buf, &buf); |
f006c9c7 JPM |
1850 | } |
1851 | } | |
f006c9c7 | 1852 | exit: |
2d72d495 JPM |
1853 | if ((!l_ptr->exp_msg_count) && (l_ptr->flags & LINK_STOPPED)) |
1854 | tipc_link_delete(l_ptr); | |
f006c9c7 JPM |
1855 | return buf; |
1856 | } | |
1857 | ||
1dab3d5a | 1858 | /* tipc_link_tunnel_rcv(): Receive a tunnelled packet, sent |
170b3927 JPM |
1859 | * via other link as result of a failover (ORIGINAL_MSG) or |
1860 | * a new active link (DUPLICATE_MSG). Failover packets are | |
1861 | * returned to the active link for delivery upwards. | |
1862 | * Owner node is locked. | |
b97bf3fd | 1863 | */ |
c5898636 | 1864 | static int tipc_link_tunnel_rcv(struct tipc_node *n_ptr, |
170b3927 | 1865 | struct sk_buff **buf) |
b97bf3fd | 1866 | { |
02842f71 JPM |
1867 | struct sk_buff *t_buf = *buf; |
1868 | struct tipc_link *l_ptr; | |
1869 | struct tipc_msg *t_msg = buf_msg(t_buf); | |
1870 | u32 bearer_id = msg_bearer_id(t_msg); | |
b97bf3fd | 1871 | |
1e9d47a9 JPM |
1872 | *buf = NULL; |
1873 | ||
cb4b102f DC |
1874 | if (bearer_id >= MAX_BEARERS) |
1875 | goto exit; | |
1dab3d5a | 1876 | |
02842f71 JPM |
1877 | l_ptr = n_ptr->links[bearer_id]; |
1878 | if (!l_ptr) | |
b97bf3fd | 1879 | goto exit; |
b97bf3fd | 1880 | |
02842f71 | 1881 | if (msg_type(t_msg) == DUPLICATE_MSG) |
c5898636 | 1882 | tipc_link_dup_rcv(l_ptr, t_buf); |
02842f71 JPM |
1883 | else if (msg_type(t_msg) == ORIGINAL_MSG) |
1884 | *buf = tipc_link_failover_rcv(l_ptr, t_buf); | |
1e9d47a9 JPM |
1885 | else |
1886 | pr_warn("%sunknown tunnel pkt received\n", link_co_err); | |
b97bf3fd | 1887 | exit: |
02842f71 | 1888 | kfree_skb(t_buf); |
1e9d47a9 | 1889 | return *buf != NULL; |
b97bf3fd PL |
1890 | } |
1891 | ||
2f55c437 | 1892 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol) |
b97bf3fd | 1893 | { |
2f55c437 YX |
1894 | unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; |
1895 | ||
1896 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
5413b4c6 AS |
1897 | return; |
1898 | ||
2f55c437 YX |
1899 | l_ptr->tolerance = tol; |
1900 | l_ptr->cont_intv = msecs_to_jiffies(intv); | |
1901 | l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->cont_intv) / 4); | |
b97bf3fd PL |
1902 | } |
1903 | ||
a18c4bc3 | 1904 | void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window) |
b97bf3fd PL |
1905 | { |
1906 | /* Data messages from this node, inclusive FIRST_FRAGM */ | |
06d82c91 AS |
1907 | l_ptr->queue_limit[TIPC_LOW_IMPORTANCE] = window; |
1908 | l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE] = (window / 3) * 4; | |
1909 | l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE] = (window / 3) * 5; | |
1910 | l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE] = (window / 3) * 6; | |
b97bf3fd | 1911 | /* Transiting data messages,inclusive FIRST_FRAGM */ |
06d82c91 AS |
1912 | l_ptr->queue_limit[TIPC_LOW_IMPORTANCE + 4] = 300; |
1913 | l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE + 4] = 600; | |
1914 | l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE + 4] = 900; | |
1915 | l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE + 4] = 1200; | |
b97bf3fd | 1916 | l_ptr->queue_limit[CONN_MANAGER] = 1200; |
b97bf3fd PL |
1917 | l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500; |
1918 | l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000; | |
1919 | /* FRAGMENT and LAST_FRAGMENT packets */ | |
1920 | l_ptr->queue_limit[MSG_FRAGMENTER] = 4000; | |
1921 | } | |
1922 | ||
e099e86c | 1923 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1924 | * @net: the applicable net namespace |
e099e86c JPM |
1925 | * @name: pointer to link name string |
1926 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1927 | * |
e099e86c | 1928 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1929 | */ |
f2f9800d YX |
1930 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1931 | const char *link_name, | |
e099e86c | 1932 | unsigned int *bearer_id) |
b97bf3fd | 1933 | { |
f2f9800d | 1934 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1935 | struct tipc_link *l_ptr; |
bbfbe47c | 1936 | struct tipc_node *n_ptr; |
886eaa1f | 1937 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1938 | int i; |
b97bf3fd | 1939 | |
e099e86c | 1940 | *bearer_id = 0; |
6c7a762e | 1941 | rcu_read_lock(); |
f2f9800d | 1942 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1943 | tipc_node_lock(n_ptr); |
bbfbe47c EH |
1944 | for (i = 0; i < MAX_BEARERS; i++) { |
1945 | l_ptr = n_ptr->links[i]; | |
e099e86c JPM |
1946 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1947 | *bearer_id = i; | |
1948 | found_node = n_ptr; | |
1949 | break; | |
1950 | } | |
bbfbe47c | 1951 | } |
a11607f5 | 1952 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1953 | if (found_node) |
1954 | break; | |
bbfbe47c | 1955 | } |
6c7a762e YX |
1956 | rcu_read_unlock(); |
1957 | ||
e099e86c | 1958 | return found_node; |
b97bf3fd PL |
1959 | } |
1960 | ||
5c216e1d AS |
1961 | /** |
1962 | * link_value_is_valid -- validate proposed link tolerance/priority/window | |
1963 | * | |
2c53040f BH |
1964 | * @cmd: value type (TIPC_CMD_SET_LINK_*) |
1965 | * @new_value: the new value | |
5c216e1d AS |
1966 | * |
1967 | * Returns 1 if value is within range, 0 if not. | |
1968 | */ | |
5c216e1d AS |
1969 | static int link_value_is_valid(u16 cmd, u32 new_value) |
1970 | { | |
1971 | switch (cmd) { | |
1972 | case TIPC_CMD_SET_LINK_TOL: | |
1973 | return (new_value >= TIPC_MIN_LINK_TOL) && | |
1974 | (new_value <= TIPC_MAX_LINK_TOL); | |
1975 | case TIPC_CMD_SET_LINK_PRI: | |
1976 | return (new_value <= TIPC_MAX_LINK_PRI); | |
1977 | case TIPC_CMD_SET_LINK_WINDOW: | |
1978 | return (new_value >= TIPC_MIN_LINK_WIN) && | |
1979 | (new_value <= TIPC_MAX_LINK_WIN); | |
1980 | } | |
1981 | return 0; | |
1982 | } | |
1983 | ||
5c216e1d AS |
1984 | /** |
1985 | * link_cmd_set_value - change priority/tolerance/window for link/bearer/media | |
f2f9800d | 1986 | * @net: the applicable net namespace |
2c53040f BH |
1987 | * @name: ptr to link, bearer, or media name |
1988 | * @new_value: new value of link, bearer, or media setting | |
1989 | * @cmd: which link, bearer, or media attribute to set (TIPC_CMD_SET_LINK_*) | |
5c216e1d | 1990 | * |
7216cd94 | 1991 | * Caller must hold RTNL lock to ensure link/bearer/media is not deleted. |
5c216e1d AS |
1992 | * |
1993 | * Returns 0 if value updated and negative value on error. | |
1994 | */ | |
f2f9800d YX |
1995 | static int link_cmd_set_value(struct net *net, const char *name, u32 new_value, |
1996 | u16 cmd) | |
5c216e1d AS |
1997 | { |
1998 | struct tipc_node *node; | |
a18c4bc3 | 1999 | struct tipc_link *l_ptr; |
5c216e1d | 2000 | struct tipc_bearer *b_ptr; |
358a0d1c | 2001 | struct tipc_media *m_ptr; |
e099e86c | 2002 | int bearer_id; |
636c0371 | 2003 | int res = 0; |
5c216e1d | 2004 | |
f2f9800d | 2005 | node = tipc_link_find_owner(net, name, &bearer_id); |
e099e86c | 2006 | if (node) { |
5c216e1d | 2007 | tipc_node_lock(node); |
e099e86c JPM |
2008 | l_ptr = node->links[bearer_id]; |
2009 | ||
2010 | if (l_ptr) { | |
2011 | switch (cmd) { | |
2012 | case TIPC_CMD_SET_LINK_TOL: | |
2013 | link_set_supervision_props(l_ptr, new_value); | |
247f0f3c YX |
2014 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, |
2015 | new_value, 0, 0); | |
e099e86c JPM |
2016 | break; |
2017 | case TIPC_CMD_SET_LINK_PRI: | |
2018 | l_ptr->priority = new_value; | |
247f0f3c YX |
2019 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, |
2020 | 0, new_value, 0); | |
e099e86c JPM |
2021 | break; |
2022 | case TIPC_CMD_SET_LINK_WINDOW: | |
2023 | tipc_link_set_queue_limits(l_ptr, new_value); | |
2024 | break; | |
2025 | default: | |
2026 | res = -EINVAL; | |
2027 | break; | |
2028 | } | |
5c216e1d AS |
2029 | } |
2030 | tipc_node_unlock(node); | |
636c0371 | 2031 | return res; |
5c216e1d AS |
2032 | } |
2033 | ||
7f9f95d9 | 2034 | b_ptr = tipc_bearer_find(net, name); |
5c216e1d AS |
2035 | if (b_ptr) { |
2036 | switch (cmd) { | |
2037 | case TIPC_CMD_SET_LINK_TOL: | |
2038 | b_ptr->tolerance = new_value; | |
636c0371 | 2039 | break; |
5c216e1d AS |
2040 | case TIPC_CMD_SET_LINK_PRI: |
2041 | b_ptr->priority = new_value; | |
636c0371 | 2042 | break; |
5c216e1d AS |
2043 | case TIPC_CMD_SET_LINK_WINDOW: |
2044 | b_ptr->window = new_value; | |
636c0371 YX |
2045 | break; |
2046 | default: | |
2047 | res = -EINVAL; | |
2048 | break; | |
5c216e1d | 2049 | } |
636c0371 | 2050 | return res; |
5c216e1d AS |
2051 | } |
2052 | ||
2053 | m_ptr = tipc_media_find(name); | |
2054 | if (!m_ptr) | |
2055 | return -ENODEV; | |
2056 | switch (cmd) { | |
2057 | case TIPC_CMD_SET_LINK_TOL: | |
2058 | m_ptr->tolerance = new_value; | |
636c0371 | 2059 | break; |
5c216e1d AS |
2060 | case TIPC_CMD_SET_LINK_PRI: |
2061 | m_ptr->priority = new_value; | |
636c0371 | 2062 | break; |
5c216e1d AS |
2063 | case TIPC_CMD_SET_LINK_WINDOW: |
2064 | m_ptr->window = new_value; | |
636c0371 YX |
2065 | break; |
2066 | default: | |
2067 | res = -EINVAL; | |
2068 | break; | |
5c216e1d | 2069 | } |
636c0371 | 2070 | return res; |
5c216e1d AS |
2071 | } |
2072 | ||
f2f9800d YX |
2073 | struct sk_buff *tipc_link_cmd_config(struct net *net, const void *req_tlv_area, |
2074 | int req_tlv_space, u16 cmd) | |
b97bf3fd PL |
2075 | { |
2076 | struct tipc_link_config *args; | |
c4307285 | 2077 | u32 new_value; |
c4307285 | 2078 | int res; |
b97bf3fd PL |
2079 | |
2080 | if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG)) | |
4323add6 | 2081 | return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR); |
b97bf3fd PL |
2082 | |
2083 | args = (struct tipc_link_config *)TLV_DATA(req_tlv_area); | |
2084 | new_value = ntohl(args->value); | |
2085 | ||
5c216e1d AS |
2086 | if (!link_value_is_valid(cmd, new_value)) |
2087 | return tipc_cfg_reply_error_string( | |
2088 | "cannot change, value invalid"); | |
2089 | ||
4323add6 | 2090 | if (!strcmp(args->name, tipc_bclink_name)) { |
b97bf3fd | 2091 | if ((cmd == TIPC_CMD_SET_LINK_WINDOW) && |
1da46568 | 2092 | (tipc_bclink_set_queue_limits(net, new_value) == 0)) |
4323add6 | 2093 | return tipc_cfg_reply_none(); |
c4307285 | 2094 | return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED |
4323add6 | 2095 | " (cannot change setting on broadcast link)"); |
b97bf3fd PL |
2096 | } |
2097 | ||
f2f9800d | 2098 | res = link_cmd_set_value(net, args->name, new_value, cmd); |
b97bf3fd | 2099 | if (res) |
c4307285 | 2100 | return tipc_cfg_reply_error_string("cannot change link setting"); |
b97bf3fd | 2101 | |
4323add6 | 2102 | return tipc_cfg_reply_none(); |
b97bf3fd PL |
2103 | } |
2104 | ||
2105 | /** | |
2106 | * link_reset_statistics - reset link statistics | |
2107 | * @l_ptr: pointer to link | |
2108 | */ | |
a18c4bc3 | 2109 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
2110 | { |
2111 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
2112 | l_ptr->stats.sent_info = l_ptr->next_out_no; | |
2113 | l_ptr->stats.recv_info = l_ptr->next_in_no; | |
2114 | } | |
2115 | ||
f2f9800d YX |
2116 | struct sk_buff *tipc_link_cmd_reset_stats(struct net *net, |
2117 | const void *req_tlv_area, | |
2118 | int req_tlv_space) | |
b97bf3fd PL |
2119 | { |
2120 | char *link_name; | |
a18c4bc3 | 2121 | struct tipc_link *l_ptr; |
6c00055a | 2122 | struct tipc_node *node; |
e099e86c | 2123 | unsigned int bearer_id; |
b97bf3fd PL |
2124 | |
2125 | if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME)) | |
4323add6 | 2126 | return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR); |
b97bf3fd PL |
2127 | |
2128 | link_name = (char *)TLV_DATA(req_tlv_area); | |
4323add6 | 2129 | if (!strcmp(link_name, tipc_bclink_name)) { |
1da46568 | 2130 | if (tipc_bclink_reset_stats(net)) |
4323add6 PL |
2131 | return tipc_cfg_reply_error_string("link not found"); |
2132 | return tipc_cfg_reply_none(); | |
b97bf3fd | 2133 | } |
f2f9800d | 2134 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
7216cd94 | 2135 | if (!node) |
e099e86c | 2136 | return tipc_cfg_reply_error_string("link not found"); |
7216cd94 | 2137 | |
a11607f5 | 2138 | tipc_node_lock(node); |
e099e86c | 2139 | l_ptr = node->links[bearer_id]; |
b97bf3fd | 2140 | if (!l_ptr) { |
e099e86c | 2141 | tipc_node_unlock(node); |
4323add6 | 2142 | return tipc_cfg_reply_error_string("link not found"); |
b97bf3fd | 2143 | } |
b97bf3fd | 2144 | link_reset_statistics(l_ptr); |
4323add6 | 2145 | tipc_node_unlock(node); |
4323add6 | 2146 | return tipc_cfg_reply_none(); |
b97bf3fd PL |
2147 | } |
2148 | ||
a18c4bc3 | 2149 | static void link_print(struct tipc_link *l_ptr, const char *str) |
b97bf3fd | 2150 | { |
7f9f95d9 | 2151 | struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id); |
7a2f7d18 YX |
2152 | struct tipc_bearer *b_ptr; |
2153 | ||
2154 | rcu_read_lock(); | |
7f9f95d9 | 2155 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
2156 | if (b_ptr) |
2157 | pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name); | |
2158 | rcu_read_unlock(); | |
8d64a5ba | 2159 | |
b97bf3fd | 2160 | if (link_working_unknown(l_ptr)) |
5deedde9 | 2161 | pr_cont(":WU\n"); |
8d64a5ba | 2162 | else if (link_reset_reset(l_ptr)) |
5deedde9 | 2163 | pr_cont(":RR\n"); |
8d64a5ba | 2164 | else if (link_reset_unknown(l_ptr)) |
5deedde9 | 2165 | pr_cont(":RU\n"); |
8d64a5ba | 2166 | else if (link_working_working(l_ptr)) |
5deedde9 PG |
2167 | pr_cont(":WW\n"); |
2168 | else | |
2169 | pr_cont("\n"); | |
b97bf3fd | 2170 | } |
0655f6a8 RA |
2171 | |
2172 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
2173 | */ | |
2174 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
2175 | { | |
2176 | int err; | |
2177 | ||
2178 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
2179 | tipc_nl_prop_policy); | |
2180 | if (err) | |
2181 | return err; | |
2182 | ||
2183 | if (props[TIPC_NLA_PROP_PRIO]) { | |
2184 | u32 prio; | |
2185 | ||
2186 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
2187 | if (prio > TIPC_MAX_LINK_PRI) | |
2188 | return -EINVAL; | |
2189 | } | |
2190 | ||
2191 | if (props[TIPC_NLA_PROP_TOL]) { | |
2192 | u32 tol; | |
2193 | ||
2194 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
2195 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
2196 | return -EINVAL; | |
2197 | } | |
2198 | ||
2199 | if (props[TIPC_NLA_PROP_WIN]) { | |
2200 | u32 win; | |
2201 | ||
2202 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
2203 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
2204 | return -EINVAL; | |
2205 | } | |
2206 | ||
2207 | return 0; | |
2208 | } | |
7be57fc6 | 2209 | |
f96ce7a2 RA |
2210 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
2211 | { | |
2212 | int err; | |
2213 | int res = 0; | |
2214 | int bearer_id; | |
2215 | char *name; | |
2216 | struct tipc_link *link; | |
2217 | struct tipc_node *node; | |
2218 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
f2f9800d | 2219 | struct net *net = genl_info_net(info); |
f96ce7a2 RA |
2220 | |
2221 | if (!info->attrs[TIPC_NLA_LINK]) | |
2222 | return -EINVAL; | |
2223 | ||
2224 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2225 | info->attrs[TIPC_NLA_LINK], | |
2226 | tipc_nl_link_policy); | |
2227 | if (err) | |
2228 | return err; | |
2229 | ||
2230 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2231 | return -EINVAL; | |
2232 | ||
2233 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2234 | ||
f2f9800d | 2235 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
2236 | if (!node) |
2237 | return -EINVAL; | |
2238 | ||
2239 | tipc_node_lock(node); | |
2240 | ||
2241 | link = node->links[bearer_id]; | |
2242 | if (!link) { | |
2243 | res = -EINVAL; | |
2244 | goto out; | |
2245 | } | |
2246 | ||
2247 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
2248 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
2249 | ||
2250 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
2251 | props); | |
2252 | if (err) { | |
2253 | res = err; | |
2254 | goto out; | |
2255 | } | |
2256 | ||
2257 | if (props[TIPC_NLA_PROP_TOL]) { | |
2258 | u32 tol; | |
2259 | ||
2260 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
2261 | link_set_supervision_props(link, tol); | |
2262 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0, 0); | |
2263 | } | |
2264 | if (props[TIPC_NLA_PROP_PRIO]) { | |
2265 | u32 prio; | |
2266 | ||
2267 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
2268 | link->priority = prio; | |
2269 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio, 0); | |
2270 | } | |
2271 | if (props[TIPC_NLA_PROP_WIN]) { | |
2272 | u32 win; | |
2273 | ||
2274 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
2275 | tipc_link_set_queue_limits(link, win); | |
2276 | } | |
2277 | } | |
2278 | ||
2279 | out: | |
2280 | tipc_node_unlock(node); | |
2281 | ||
2282 | return res; | |
2283 | } | |
d8182804 RA |
2284 | |
2285 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
2286 | { |
2287 | int i; | |
2288 | struct nlattr *stats; | |
2289 | ||
2290 | struct nla_map { | |
2291 | u32 key; | |
2292 | u32 val; | |
2293 | }; | |
2294 | ||
2295 | struct nla_map map[] = { | |
2296 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
2297 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
2298 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
2299 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
2300 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
2301 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
2302 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
2303 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
2304 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
2305 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
2306 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
2307 | s->msg_length_counts : 1}, | |
2308 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
2309 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
2310 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
2311 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
2312 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
2313 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
2314 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
2315 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
2316 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
2317 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
2318 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
2319 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
2320 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
2321 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
2322 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
2323 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
2324 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
2325 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
2326 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
2327 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
2328 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
2329 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
2330 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
2331 | }; | |
2332 | ||
2333 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
2334 | if (!stats) | |
2335 | return -EMSGSIZE; | |
2336 | ||
2337 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2338 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2339 | goto msg_full; | |
2340 | ||
2341 | nla_nest_end(skb, stats); | |
2342 | ||
2343 | return 0; | |
2344 | msg_full: | |
2345 | nla_nest_cancel(skb, stats); | |
2346 | ||
2347 | return -EMSGSIZE; | |
2348 | } | |
2349 | ||
2350 | /* Caller should hold appropriate locks to protect the link */ | |
34747539 YX |
2351 | static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
2352 | struct tipc_link *link) | |
7be57fc6 RA |
2353 | { |
2354 | int err; | |
2355 | void *hdr; | |
2356 | struct nlattr *attrs; | |
2357 | struct nlattr *prop; | |
34747539 | 2358 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 2359 | |
bfb3e5dd | 2360 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
7be57fc6 RA |
2361 | NLM_F_MULTI, TIPC_NL_LINK_GET); |
2362 | if (!hdr) | |
2363 | return -EMSGSIZE; | |
2364 | ||
2365 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2366 | if (!attrs) | |
2367 | goto msg_full; | |
2368 | ||
2369 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2370 | goto attr_msg_full; | |
2371 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 2372 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 RA |
2373 | goto attr_msg_full; |
2374 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->max_pkt)) | |
2375 | goto attr_msg_full; | |
2376 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no)) | |
2377 | goto attr_msg_full; | |
2378 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->next_out_no)) | |
2379 | goto attr_msg_full; | |
2380 | ||
2381 | if (tipc_link_is_up(link)) | |
2382 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2383 | goto attr_msg_full; | |
2384 | if (tipc_link_is_active(link)) | |
2385 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) | |
2386 | goto attr_msg_full; | |
2387 | ||
2388 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2389 | if (!prop) | |
2390 | goto attr_msg_full; | |
2391 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2392 | goto prop_msg_full; | |
2393 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2394 | goto prop_msg_full; | |
2395 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
2396 | link->queue_limit[TIPC_LOW_IMPORTANCE])) | |
2397 | goto prop_msg_full; | |
2398 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2399 | goto prop_msg_full; | |
2400 | nla_nest_end(msg->skb, prop); | |
2401 | ||
2402 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2403 | if (err) | |
2404 | goto attr_msg_full; | |
2405 | ||
2406 | nla_nest_end(msg->skb, attrs); | |
2407 | genlmsg_end(msg->skb, hdr); | |
2408 | ||
2409 | return 0; | |
2410 | ||
2411 | prop_msg_full: | |
2412 | nla_nest_cancel(msg->skb, prop); | |
2413 | attr_msg_full: | |
2414 | nla_nest_cancel(msg->skb, attrs); | |
2415 | msg_full: | |
2416 | genlmsg_cancel(msg->skb, hdr); | |
2417 | ||
2418 | return -EMSGSIZE; | |
2419 | } | |
2420 | ||
2421 | /* Caller should hold node lock */ | |
34747539 YX |
2422 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, |
2423 | struct tipc_node *node, u32 *prev_link) | |
7be57fc6 RA |
2424 | { |
2425 | u32 i; | |
2426 | int err; | |
2427 | ||
2428 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
2429 | *prev_link = i; | |
2430 | ||
2431 | if (!node->links[i]) | |
2432 | continue; | |
2433 | ||
34747539 | 2434 | err = __tipc_nl_add_link(net, msg, node->links[i]); |
7be57fc6 RA |
2435 | if (err) |
2436 | return err; | |
2437 | } | |
2438 | *prev_link = 0; | |
2439 | ||
2440 | return 0; | |
2441 | } | |
2442 | ||
2443 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2444 | { | |
f2f9800d YX |
2445 | struct net *net = sock_net(skb->sk); |
2446 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
2447 | struct tipc_node *node; |
2448 | struct tipc_nl_msg msg; | |
2449 | u32 prev_node = cb->args[0]; | |
2450 | u32 prev_link = cb->args[1]; | |
2451 | int done = cb->args[2]; | |
2452 | int err; | |
2453 | ||
2454 | if (done) | |
2455 | return 0; | |
2456 | ||
2457 | msg.skb = skb; | |
2458 | msg.portid = NETLINK_CB(cb->skb).portid; | |
2459 | msg.seq = cb->nlh->nlmsg_seq; | |
2460 | ||
2461 | rcu_read_lock(); | |
2462 | ||
2463 | if (prev_node) { | |
f2f9800d | 2464 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
2465 | if (!node) { |
2466 | /* We never set seq or call nl_dump_check_consistent() | |
2467 | * this means that setting prev_seq here will cause the | |
2468 | * consistence check to fail in the netlink callback | |
2469 | * handler. Resulting in the last NLMSG_DONE message | |
2470 | * having the NLM_F_DUMP_INTR flag set. | |
2471 | */ | |
2472 | cb->prev_seq = 1; | |
2473 | goto out; | |
2474 | } | |
2475 | ||
f2f9800d YX |
2476 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
2477 | list) { | |
7be57fc6 | 2478 | tipc_node_lock(node); |
34747539 YX |
2479 | err = __tipc_nl_add_node_links(net, &msg, node, |
2480 | &prev_link); | |
7be57fc6 RA |
2481 | tipc_node_unlock(node); |
2482 | if (err) | |
2483 | goto out; | |
2484 | ||
2485 | prev_node = node->addr; | |
2486 | } | |
2487 | } else { | |
1da46568 | 2488 | err = tipc_nl_add_bc_link(net, &msg); |
7be57fc6 RA |
2489 | if (err) |
2490 | goto out; | |
2491 | ||
f2f9800d | 2492 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 | 2493 | tipc_node_lock(node); |
34747539 YX |
2494 | err = __tipc_nl_add_node_links(net, &msg, node, |
2495 | &prev_link); | |
7be57fc6 RA |
2496 | tipc_node_unlock(node); |
2497 | if (err) | |
2498 | goto out; | |
2499 | ||
2500 | prev_node = node->addr; | |
2501 | } | |
2502 | } | |
2503 | done = 1; | |
2504 | out: | |
2505 | rcu_read_unlock(); | |
2506 | ||
2507 | cb->args[0] = prev_node; | |
2508 | cb->args[1] = prev_link; | |
2509 | cb->args[2] = done; | |
2510 | ||
2511 | return skb->len; | |
2512 | } | |
2513 | ||
2514 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
2515 | { | |
f2f9800d | 2516 | struct net *net = genl_info_net(info); |
7be57fc6 RA |
2517 | struct sk_buff *ans_skb; |
2518 | struct tipc_nl_msg msg; | |
2519 | struct tipc_link *link; | |
2520 | struct tipc_node *node; | |
2521 | char *name; | |
2522 | int bearer_id; | |
2523 | int err; | |
2524 | ||
2525 | if (!info->attrs[TIPC_NLA_LINK_NAME]) | |
2526 | return -EINVAL; | |
2527 | ||
2528 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); | |
f2f9800d | 2529 | node = tipc_link_find_owner(net, name, &bearer_id); |
7be57fc6 RA |
2530 | if (!node) |
2531 | return -EINVAL; | |
2532 | ||
2533 | ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2534 | if (!ans_skb) | |
2535 | return -ENOMEM; | |
2536 | ||
2537 | msg.skb = ans_skb; | |
2538 | msg.portid = info->snd_portid; | |
2539 | msg.seq = info->snd_seq; | |
2540 | ||
2541 | tipc_node_lock(node); | |
2542 | link = node->links[bearer_id]; | |
2543 | if (!link) { | |
2544 | err = -EINVAL; | |
2545 | goto err_out; | |
2546 | } | |
2547 | ||
34747539 | 2548 | err = __tipc_nl_add_link(net, &msg, link); |
7be57fc6 RA |
2549 | if (err) |
2550 | goto err_out; | |
2551 | ||
2552 | tipc_node_unlock(node); | |
2553 | ||
2554 | return genlmsg_reply(ans_skb, info); | |
2555 | ||
2556 | err_out: | |
2557 | tipc_node_unlock(node); | |
2558 | nlmsg_free(ans_skb); | |
2559 | ||
2560 | return err; | |
2561 | } | |
ae36342b RA |
2562 | |
2563 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
2564 | { | |
2565 | int err; | |
2566 | char *link_name; | |
2567 | unsigned int bearer_id; | |
2568 | struct tipc_link *link; | |
2569 | struct tipc_node *node; | |
2570 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
f2f9800d | 2571 | struct net *net = genl_info_net(info); |
ae36342b RA |
2572 | |
2573 | if (!info->attrs[TIPC_NLA_LINK]) | |
2574 | return -EINVAL; | |
2575 | ||
2576 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2577 | info->attrs[TIPC_NLA_LINK], | |
2578 | tipc_nl_link_policy); | |
2579 | if (err) | |
2580 | return err; | |
2581 | ||
2582 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2583 | return -EINVAL; | |
2584 | ||
2585 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2586 | ||
2587 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
1da46568 | 2588 | err = tipc_bclink_reset_stats(net); |
ae36342b RA |
2589 | if (err) |
2590 | return err; | |
2591 | return 0; | |
2592 | } | |
2593 | ||
f2f9800d | 2594 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
2595 | if (!node) |
2596 | return -EINVAL; | |
2597 | ||
2598 | tipc_node_lock(node); | |
2599 | ||
2600 | link = node->links[bearer_id]; | |
2601 | if (!link) { | |
2602 | tipc_node_unlock(node); | |
2603 | return -EINVAL; | |
2604 | } | |
2605 | ||
2606 | link_reset_statistics(link); | |
2607 | ||
2608 | tipc_node_unlock(node); | |
2609 | ||
2610 | return 0; | |
2611 | } |