Commit | Line | Data |
---|---|---|
b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
c1336ee4 | 4 | * Copyright (c) 1996-2007, 2012-2015, 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" | |
e3eea1eb | 38 | #include "subscr.h" |
b97bf3fd | 39 | #include "link.h" |
7be57fc6 | 40 | #include "bcast.h" |
9816f061 | 41 | #include "socket.h" |
b97bf3fd | 42 | #include "name_distr.h" |
b97bf3fd | 43 | #include "discover.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 | ||
8b4ed863 JPM |
142 | static struct tipc_link *tipc_parallel_link(struct tipc_link *l) |
143 | { | |
144 | if (l->owner->active_links[0] != l) | |
145 | return l->owner->active_links[0]; | |
146 | return l->owner->active_links[1]; | |
147 | } | |
148 | ||
a18c4bc3 | 149 | static void link_init_max_pkt(struct tipc_link *l_ptr) |
b97bf3fd | 150 | { |
7f9f95d9 YX |
151 | struct tipc_node *node = l_ptr->owner; |
152 | struct tipc_net *tn = net_generic(node->net, tipc_net_id); | |
7a2f7d18 | 153 | struct tipc_bearer *b_ptr; |
b97bf3fd | 154 | u32 max_pkt; |
c4307285 | 155 | |
7a2f7d18 | 156 | rcu_read_lock(); |
7f9f95d9 | 157 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
158 | if (!b_ptr) { |
159 | rcu_read_unlock(); | |
160 | return; | |
161 | } | |
162 | max_pkt = (b_ptr->mtu & ~3); | |
163 | rcu_read_unlock(); | |
164 | ||
b97bf3fd PL |
165 | if (max_pkt > MAX_MSG_SIZE) |
166 | max_pkt = MAX_MSG_SIZE; | |
167 | ||
c4307285 | 168 | l_ptr->max_pkt_target = max_pkt; |
b97bf3fd PL |
169 | if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT) |
170 | l_ptr->max_pkt = l_ptr->max_pkt_target; | |
c4307285 | 171 | else |
b97bf3fd PL |
172 | l_ptr->max_pkt = MAX_PKT_DEFAULT; |
173 | ||
c4307285 | 174 | l_ptr->max_pkt_probes = 0; |
b97bf3fd PL |
175 | } |
176 | ||
b97bf3fd | 177 | /* |
05790c64 | 178 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 179 | */ |
a18c4bc3 | 180 | int tipc_link_is_up(struct tipc_link *l_ptr) |
b97bf3fd PL |
181 | { |
182 | if (!l_ptr) | |
183 | return 0; | |
a02cec21 | 184 | return link_working_working(l_ptr) || link_working_unknown(l_ptr); |
b97bf3fd PL |
185 | } |
186 | ||
a18c4bc3 | 187 | int tipc_link_is_active(struct tipc_link *l_ptr) |
b97bf3fd | 188 | { |
a02cec21 ED |
189 | return (l_ptr->owner->active_links[0] == l_ptr) || |
190 | (l_ptr->owner->active_links[1] == l_ptr); | |
b97bf3fd PL |
191 | } |
192 | ||
b97bf3fd PL |
193 | /** |
194 | * link_timeout - handle expiration of link timer | |
195 | * @l_ptr: pointer to link | |
b97bf3fd | 196 | */ |
2f55c437 | 197 | static void link_timeout(unsigned long data) |
b97bf3fd | 198 | { |
2f55c437 | 199 | struct tipc_link *l_ptr = (struct tipc_link *)data; |
58dc55f2 YX |
200 | struct sk_buff *skb; |
201 | ||
4323add6 | 202 | tipc_node_lock(l_ptr->owner); |
b97bf3fd PL |
203 | |
204 | /* update counters used in statistical profiling of send traffic */ | |
05dcc5aa | 205 | l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->transmq); |
b97bf3fd PL |
206 | l_ptr->stats.queue_sz_counts++; |
207 | ||
05dcc5aa | 208 | skb = skb_peek(&l_ptr->transmq); |
58dc55f2 YX |
209 | if (skb) { |
210 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
211 | u32 length = msg_size(msg); |
212 | ||
f64f9e71 JP |
213 | if ((msg_user(msg) == MSG_FRAGMENTER) && |
214 | (msg_type(msg) == FIRST_FRAGMENT)) { | |
b97bf3fd PL |
215 | length = msg_size(msg_get_wrapped(msg)); |
216 | } | |
217 | if (length) { | |
218 | l_ptr->stats.msg_lengths_total += length; | |
219 | l_ptr->stats.msg_length_counts++; | |
220 | if (length <= 64) | |
221 | l_ptr->stats.msg_length_profile[0]++; | |
222 | else if (length <= 256) | |
223 | l_ptr->stats.msg_length_profile[1]++; | |
224 | else if (length <= 1024) | |
225 | l_ptr->stats.msg_length_profile[2]++; | |
226 | else if (length <= 4096) | |
227 | l_ptr->stats.msg_length_profile[3]++; | |
228 | else if (length <= 16384) | |
229 | l_ptr->stats.msg_length_profile[4]++; | |
230 | else if (length <= 32768) | |
231 | l_ptr->stats.msg_length_profile[5]++; | |
232 | else | |
233 | l_ptr->stats.msg_length_profile[6]++; | |
234 | } | |
235 | } | |
236 | ||
237 | /* do all other link processing performed on a periodic basis */ | |
b97bf3fd PL |
238 | link_state_event(l_ptr, TIMEOUT_EVT); |
239 | ||
05dcc5aa | 240 | if (skb_queue_len(&l_ptr->backlogq)) |
47b4c9a8 | 241 | tipc_link_push_packets(l_ptr); |
b97bf3fd | 242 | |
4323add6 | 243 | tipc_node_unlock(l_ptr->owner); |
2d72d495 | 244 | tipc_link_put(l_ptr); |
b97bf3fd PL |
245 | } |
246 | ||
2f55c437 | 247 | static void link_set_timer(struct tipc_link *link, unsigned long time) |
b97bf3fd | 248 | { |
2d72d495 JPM |
249 | if (!mod_timer(&link->timer, jiffies + time)) |
250 | tipc_link_get(link); | |
b97bf3fd PL |
251 | } |
252 | ||
253 | /** | |
4323add6 | 254 | * tipc_link_create - create a new link |
37b9c08a | 255 | * @n_ptr: pointer to associated node |
b97bf3fd | 256 | * @b_ptr: pointer to associated bearer |
b97bf3fd | 257 | * @media_addr: media address to use when sending messages over link |
c4307285 | 258 | * |
b97bf3fd PL |
259 | * Returns pointer to link. |
260 | */ | |
a18c4bc3 | 261 | struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, |
c61dd61d YX |
262 | struct tipc_bearer *b_ptr, |
263 | const struct tipc_media_addr *media_addr) | |
b97bf3fd | 264 | { |
34747539 | 265 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
a18c4bc3 | 266 | struct tipc_link *l_ptr; |
b97bf3fd PL |
267 | struct tipc_msg *msg; |
268 | char *if_name; | |
37b9c08a AS |
269 | char addr_string[16]; |
270 | u32 peer = n_ptr->addr; | |
271 | ||
0372bf5c | 272 | if (n_ptr->link_cnt >= MAX_BEARERS) { |
37b9c08a | 273 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
0372bf5c HB |
274 | pr_err("Attempt to establish %uth link to %s. Max %u allowed.\n", |
275 | n_ptr->link_cnt, addr_string, MAX_BEARERS); | |
37b9c08a AS |
276 | return NULL; |
277 | } | |
278 | ||
279 | if (n_ptr->links[b_ptr->identity]) { | |
280 | tipc_addr_string_fill(addr_string, n_ptr->addr); | |
2cf8aa19 EH |
281 | pr_err("Attempt to establish second link on <%s> to %s\n", |
282 | b_ptr->name, addr_string); | |
37b9c08a AS |
283 | return NULL; |
284 | } | |
b97bf3fd | 285 | |
0da974f4 | 286 | l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC); |
b97bf3fd | 287 | if (!l_ptr) { |
2cf8aa19 | 288 | pr_warn("Link creation failed, no memory\n"); |
b97bf3fd PL |
289 | return NULL; |
290 | } | |
2d72d495 | 291 | kref_init(&l_ptr->ref); |
b97bf3fd | 292 | l_ptr->addr = peer; |
2d627b92 | 293 | if_name = strchr(b_ptr->name, ':') + 1; |
062b4c99 | 294 | sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
34747539 YX |
295 | tipc_zone(tn->own_addr), tipc_cluster(tn->own_addr), |
296 | tipc_node(tn->own_addr), | |
b97bf3fd PL |
297 | if_name, |
298 | tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
062b4c99 | 299 | /* note: peer i/f name is updated by reset/activate message */ |
b97bf3fd | 300 | memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr)); |
37b9c08a | 301 | l_ptr->owner = n_ptr; |
b97bf3fd | 302 | l_ptr->checkpoint = 1; |
f882cb76 | 303 | l_ptr->peer_session = INVALID_SESSION; |
7a2f7d18 | 304 | l_ptr->bearer_id = b_ptr->identity; |
5c216e1d | 305 | link_set_supervision_props(l_ptr, b_ptr->tolerance); |
b97bf3fd PL |
306 | l_ptr->state = RESET_UNKNOWN; |
307 | ||
308 | l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg; | |
309 | msg = l_ptr->pmsg; | |
c5898636 | 310 | tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, |
34747539 | 311 | l_ptr->addr); |
b97bf3fd | 312 | msg_set_size(msg, sizeof(l_ptr->proto_msg)); |
bafa29e3 | 313 | msg_set_session(msg, (tn->random & 0xffff)); |
b97bf3fd PL |
314 | msg_set_bearer_id(msg, b_ptr->identity); |
315 | strcpy((char *)msg_data(msg), if_name); | |
7a2f7d18 | 316 | l_ptr->net_plane = b_ptr->net_plane; |
b97bf3fd | 317 | link_init_max_pkt(l_ptr); |
e3eea1eb JPM |
318 | l_ptr->priority = b_ptr->priority; |
319 | tipc_link_set_queue_limits(l_ptr, b_ptr->window); | |
b97bf3fd | 320 | l_ptr->next_out_no = 1; |
05dcc5aa JPM |
321 | __skb_queue_head_init(&l_ptr->transmq); |
322 | __skb_queue_head_init(&l_ptr->backlogq); | |
323 | __skb_queue_head_init(&l_ptr->deferdq); | |
c637c103 JPM |
324 | skb_queue_head_init(&l_ptr->wakeupq); |
325 | skb_queue_head_init(&l_ptr->inputq); | |
326 | skb_queue_head_init(&l_ptr->namedq); | |
b97bf3fd | 327 | link_reset_statistics(l_ptr); |
37b9c08a | 328 | tipc_node_attach_link(n_ptr, l_ptr); |
2f55c437 | 329 | setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr); |
581465fa | 330 | link_state_event(l_ptr, STARTING_EVT); |
b97bf3fd | 331 | |
b97bf3fd PL |
332 | return l_ptr; |
333 | } | |
334 | ||
2d72d495 JPM |
335 | /** |
336 | * link_delete - Conditional deletion of link. | |
337 | * If timer still running, real delete is done when it expires | |
338 | * @link: link to be deleted | |
339 | */ | |
340 | void tipc_link_delete(struct tipc_link *link) | |
341 | { | |
342 | tipc_link_reset_fragments(link); | |
343 | tipc_node_detach_link(link->owner, link); | |
344 | tipc_link_put(link); | |
345 | } | |
346 | ||
f2f9800d YX |
347 | void tipc_link_delete_list(struct net *net, unsigned int bearer_id, |
348 | bool shutting_down) | |
8d8439b6 | 349 | { |
f2f9800d | 350 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
2d72d495 JPM |
351 | struct tipc_link *link; |
352 | struct tipc_node *node; | |
169bf912 | 353 | bool del_link; |
8d8439b6 | 354 | |
6c7a762e | 355 | rcu_read_lock(); |
2d72d495 JPM |
356 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
357 | tipc_node_lock(node); | |
358 | link = node->links[bearer_id]; | |
359 | if (!link) { | |
360 | tipc_node_unlock(node); | |
c61dd61d YX |
361 | continue; |
362 | } | |
169bf912 | 363 | del_link = !tipc_link_is_up(link) && !link->exp_msg_count; |
2d72d495 JPM |
364 | tipc_link_reset(link); |
365 | if (del_timer(&link->timer)) | |
366 | tipc_link_put(link); | |
367 | link->flags |= LINK_STOPPED; | |
368 | /* Delete link now, or when failover is finished: */ | |
169bf912 | 369 | if (shutting_down || !tipc_node_is_up(node) || del_link) |
2d72d495 JPM |
370 | tipc_link_delete(link); |
371 | tipc_node_unlock(node); | |
8d8439b6 | 372 | } |
6c7a762e | 373 | rcu_read_unlock(); |
8d8439b6 | 374 | } |
b97bf3fd PL |
375 | |
376 | /** | |
3127a020 | 377 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 378 | * @link: congested link |
3127a020 | 379 | * @list: message that was attempted sent |
50100a5e | 380 | * Create pseudo msg to send back to user when congestion abates |
3127a020 | 381 | * Only consumes message if there is an error |
b97bf3fd | 382 | */ |
3127a020 | 383 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 384 | { |
3127a020 JPM |
385 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
386 | int imp = msg_importance(msg); | |
387 | u32 oport = msg_origport(msg); | |
388 | u32 addr = link_own_addr(link); | |
389 | struct sk_buff *skb; | |
390 | ||
391 | /* This really cannot happen... */ | |
392 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
393 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
394 | tipc_link_reset(link); | |
395 | goto err; | |
396 | } | |
397 | /* Non-blocking sender: */ | |
398 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
399 | return -ELINKCONG; | |
400 | ||
401 | /* Create and schedule wakeup pseudo message */ | |
402 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
403 | addr, addr, oport, 0, 0); | |
404 | if (!skb) | |
405 | goto err; | |
406 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); | |
407 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
408 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 409 | link->stats.link_congs++; |
3127a020 JPM |
410 | return -ELINKCONG; |
411 | err: | |
412 | __skb_queue_purge(list); | |
413 | return -ENOBUFS; | |
b97bf3fd PL |
414 | } |
415 | ||
50100a5e JPM |
416 | /** |
417 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
418 | * @link: congested link | |
419 | * Move a number of waiting users, as permitted by available space in | |
420 | * the send queue, from link wait queue to node wait queue for wakeup | |
421 | */ | |
1f66d161 | 422 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 423 | { |
1f66d161 JPM |
424 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
425 | int imp, lim; | |
58d78b32 | 426 | struct sk_buff *skb, *tmp; |
50100a5e | 427 | |
1f66d161 JPM |
428 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
429 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
430 | lim = l->window + l->backlog[imp].limit; | |
431 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
432 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 433 | break; |
1f66d161 JPM |
434 | skb_unlink(skb, &l->wakeupq); |
435 | skb_queue_tail(&l->inputq, skb); | |
436 | l->owner->inputq = &l->inputq; | |
437 | l->owner->action_flags |= TIPC_MSG_EVT; | |
b97bf3fd | 438 | } |
b97bf3fd PL |
439 | } |
440 | ||
b97bf3fd | 441 | /** |
4323add6 | 442 | * tipc_link_reset_fragments - purge link's inbound message fragments queue |
b97bf3fd PL |
443 | * @l_ptr: pointer to link |
444 | */ | |
a18c4bc3 | 445 | void tipc_link_reset_fragments(struct tipc_link *l_ptr) |
b97bf3fd | 446 | { |
37e22164 JPM |
447 | kfree_skb(l_ptr->reasm_buf); |
448 | l_ptr->reasm_buf = NULL; | |
b97bf3fd PL |
449 | } |
450 | ||
1f66d161 JPM |
451 | static void tipc_link_purge_backlog(struct tipc_link *l) |
452 | { | |
453 | __skb_queue_purge(&l->backlogq); | |
454 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
455 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
456 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
457 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
458 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
459 | } | |
460 | ||
c4307285 | 461 | /** |
581465fa | 462 | * tipc_link_purge_queues - purge all pkt queues associated with link |
b97bf3fd PL |
463 | * @l_ptr: pointer to link |
464 | */ | |
581465fa | 465 | void tipc_link_purge_queues(struct tipc_link *l_ptr) |
b97bf3fd | 466 | { |
05dcc5aa JPM |
467 | __skb_queue_purge(&l_ptr->deferdq); |
468 | __skb_queue_purge(&l_ptr->transmq); | |
1f66d161 | 469 | tipc_link_purge_backlog(l_ptr); |
4323add6 | 470 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
471 | } |
472 | ||
a18c4bc3 | 473 | void tipc_link_reset(struct tipc_link *l_ptr) |
b97bf3fd | 474 | { |
b97bf3fd PL |
475 | u32 prev_state = l_ptr->state; |
476 | u32 checkpoint = l_ptr->next_in_no; | |
5392d646 | 477 | int was_active_link = tipc_link_is_active(l_ptr); |
50100a5e | 478 | struct tipc_node *owner = l_ptr->owner; |
c4307285 | 479 | |
a686e685 | 480 | msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff)); |
b97bf3fd | 481 | |
a686e685 AS |
482 | /* Link is down, accept any session */ |
483 | l_ptr->peer_session = INVALID_SESSION; | |
b97bf3fd | 484 | |
c4307285 | 485 | /* Prepare for max packet size negotiation */ |
b97bf3fd | 486 | link_init_max_pkt(l_ptr); |
c4307285 | 487 | |
b97bf3fd | 488 | l_ptr->state = RESET_UNKNOWN; |
b97bf3fd PL |
489 | |
490 | if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET)) | |
491 | return; | |
492 | ||
4323add6 | 493 | tipc_node_link_down(l_ptr->owner, l_ptr); |
7f9f95d9 | 494 | tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr); |
7368ddf1 | 495 | |
b9d4c339 | 496 | if (was_active_link && tipc_node_active_links(l_ptr->owner)) { |
b97bf3fd PL |
497 | l_ptr->reset_checkpoint = checkpoint; |
498 | l_ptr->exp_msg_count = START_CHANGEOVER; | |
499 | } | |
500 | ||
c637c103 | 501 | /* Clean up all queues, except inputq: */ |
05dcc5aa | 502 | __skb_queue_purge(&l_ptr->transmq); |
05dcc5aa | 503 | __skb_queue_purge(&l_ptr->deferdq); |
e6441bae JPM |
504 | if (!owner->inputq) |
505 | owner->inputq = &l_ptr->inputq; | |
506 | skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq); | |
507 | if (!skb_queue_empty(owner->inputq)) | |
c637c103 | 508 | owner->action_flags |= TIPC_MSG_EVT; |
1f66d161 | 509 | tipc_link_purge_backlog(l_ptr); |
05dcc5aa | 510 | l_ptr->rcv_unacked = 0; |
b97bf3fd PL |
511 | l_ptr->checkpoint = 1; |
512 | l_ptr->next_out_no = 1; | |
b97bf3fd PL |
513 | l_ptr->fsm_msg_cnt = 0; |
514 | l_ptr->stale_count = 0; | |
515 | link_reset_statistics(l_ptr); | |
b97bf3fd PL |
516 | } |
517 | ||
f2f9800d | 518 | void tipc_link_reset_list(struct net *net, unsigned int bearer_id) |
e0ca2c30 | 519 | { |
f2f9800d | 520 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
e0ca2c30 | 521 | struct tipc_link *l_ptr; |
c61dd61d | 522 | struct tipc_node *n_ptr; |
e0ca2c30 | 523 | |
6c7a762e | 524 | rcu_read_lock(); |
f2f9800d | 525 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
5356f3d7 | 526 | tipc_node_lock(n_ptr); |
c61dd61d YX |
527 | l_ptr = n_ptr->links[bearer_id]; |
528 | if (l_ptr) | |
529 | tipc_link_reset(l_ptr); | |
5356f3d7 | 530 | tipc_node_unlock(n_ptr); |
e0ca2c30 | 531 | } |
6c7a762e | 532 | rcu_read_unlock(); |
e0ca2c30 | 533 | } |
b97bf3fd | 534 | |
7f9f95d9 | 535 | static void link_activate(struct tipc_link *link) |
b97bf3fd | 536 | { |
7f9f95d9 YX |
537 | struct tipc_node *node = link->owner; |
538 | ||
539 | link->next_in_no = 1; | |
540 | link->stats.recv_info = 1; | |
541 | tipc_node_link_up(node, link); | |
542 | tipc_bearer_add_dest(node->net, link->bearer_id, link->addr); | |
b97bf3fd PL |
543 | } |
544 | ||
545 | /** | |
546 | * link_state_event - link finite state machine | |
547 | * @l_ptr: pointer to link | |
548 | * @event: state machine event to process | |
549 | */ | |
95c96174 | 550 | static void link_state_event(struct tipc_link *l_ptr, unsigned int event) |
b97bf3fd | 551 | { |
a18c4bc3 | 552 | struct tipc_link *other; |
2f55c437 | 553 | unsigned long cont_intv = l_ptr->cont_intv; |
b97bf3fd | 554 | |
7d33939f JPM |
555 | if (l_ptr->flags & LINK_STOPPED) |
556 | return; | |
557 | ||
135daee6 | 558 | if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT)) |
b97bf3fd PL |
559 | return; /* Not yet. */ |
560 | ||
77a7e07a YX |
561 | /* Check whether changeover is going on */ |
562 | if (l_ptr->exp_msg_count) { | |
a016892c | 563 | if (event == TIMEOUT_EVT) |
b97bf3fd | 564 | link_set_timer(l_ptr, cont_intv); |
77a7e07a | 565 | return; |
b97bf3fd | 566 | } |
b97bf3fd PL |
567 | |
568 | switch (l_ptr->state) { | |
569 | case WORKING_WORKING: | |
b97bf3fd PL |
570 | switch (event) { |
571 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 572 | case ACTIVATE_MSG: |
b97bf3fd PL |
573 | break; |
574 | case TIMEOUT_EVT: | |
b97bf3fd PL |
575 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
576 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 577 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c YX |
578 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
579 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
580 | l_ptr->fsm_msg_cnt++; |
581 | } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) { | |
247f0f3c YX |
582 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
583 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
584 | l_ptr->fsm_msg_cnt++; |
585 | } | |
586 | link_set_timer(l_ptr, cont_intv); | |
587 | break; | |
588 | } | |
b97bf3fd PL |
589 | l_ptr->state = WORKING_UNKNOWN; |
590 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c | 591 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd PL |
592 | l_ptr->fsm_msg_cnt++; |
593 | link_set_timer(l_ptr, cont_intv / 4); | |
594 | break; | |
595 | case RESET_MSG: | |
3fa9cacd EH |
596 | pr_debug("%s<%s>, requested by peer\n", |
597 | link_rst_msg, l_ptr->name); | |
4323add6 | 598 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
599 | l_ptr->state = RESET_RESET; |
600 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
601 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
602 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
603 | l_ptr->fsm_msg_cnt++; |
604 | link_set_timer(l_ptr, cont_intv); | |
605 | break; | |
606 | default: | |
3fa9cacd | 607 | pr_debug("%s%u in WW state\n", link_unk_evt, event); |
b97bf3fd PL |
608 | } |
609 | break; | |
610 | case WORKING_UNKNOWN: | |
b97bf3fd PL |
611 | switch (event) { |
612 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 613 | case ACTIVATE_MSG: |
b97bf3fd PL |
614 | l_ptr->state = WORKING_WORKING; |
615 | l_ptr->fsm_msg_cnt = 0; | |
616 | link_set_timer(l_ptr, cont_intv); | |
617 | break; | |
618 | case RESET_MSG: | |
3fa9cacd EH |
619 | pr_debug("%s<%s>, requested by peer while probing\n", |
620 | link_rst_msg, l_ptr->name); | |
4323add6 | 621 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
622 | l_ptr->state = RESET_RESET; |
623 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
624 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
625 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
626 | l_ptr->fsm_msg_cnt++; |
627 | link_set_timer(l_ptr, cont_intv); | |
628 | break; | |
629 | case TIMEOUT_EVT: | |
b97bf3fd | 630 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
b97bf3fd PL |
631 | l_ptr->state = WORKING_WORKING; |
632 | l_ptr->fsm_msg_cnt = 0; | |
633 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 634 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c YX |
635 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
636 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
637 | l_ptr->fsm_msg_cnt++; |
638 | } | |
639 | link_set_timer(l_ptr, cont_intv); | |
640 | } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) { | |
247f0f3c YX |
641 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
642 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
643 | l_ptr->fsm_msg_cnt++; |
644 | link_set_timer(l_ptr, cont_intv / 4); | |
645 | } else { /* Link has failed */ | |
3fa9cacd EH |
646 | pr_debug("%s<%s>, peer not responding\n", |
647 | link_rst_msg, l_ptr->name); | |
4323add6 | 648 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
649 | l_ptr->state = RESET_UNKNOWN; |
650 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
651 | tipc_link_proto_xmit(l_ptr, RESET_MSG, |
652 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
653 | l_ptr->fsm_msg_cnt++; |
654 | link_set_timer(l_ptr, cont_intv); | |
655 | } | |
656 | break; | |
657 | default: | |
2cf8aa19 | 658 | pr_err("%s%u in WU state\n", link_unk_evt, event); |
b97bf3fd PL |
659 | } |
660 | break; | |
661 | case RESET_UNKNOWN: | |
b97bf3fd PL |
662 | switch (event) { |
663 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
664 | break; |
665 | case ACTIVATE_MSG: | |
666 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 667 | if (other && link_working_unknown(other)) |
b97bf3fd | 668 | break; |
b97bf3fd PL |
669 | l_ptr->state = WORKING_WORKING; |
670 | l_ptr->fsm_msg_cnt = 0; | |
671 | link_activate(l_ptr); | |
247f0f3c | 672 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd | 673 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 674 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 675 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
676 | link_set_timer(l_ptr, cont_intv); |
677 | break; | |
678 | case RESET_MSG: | |
b97bf3fd PL |
679 | l_ptr->state = RESET_RESET; |
680 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
681 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
682 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
683 | l_ptr->fsm_msg_cnt++; |
684 | link_set_timer(l_ptr, cont_intv); | |
685 | break; | |
686 | case STARTING_EVT: | |
135daee6 | 687 | l_ptr->flags |= LINK_STARTED; |
af9946fd JPM |
688 | l_ptr->fsm_msg_cnt++; |
689 | link_set_timer(l_ptr, cont_intv); | |
690 | break; | |
b97bf3fd | 691 | case TIMEOUT_EVT: |
247f0f3c | 692 | tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0, 0); |
b97bf3fd PL |
693 | l_ptr->fsm_msg_cnt++; |
694 | link_set_timer(l_ptr, cont_intv); | |
695 | break; | |
696 | default: | |
2cf8aa19 | 697 | pr_err("%s%u in RU state\n", link_unk_evt, event); |
b97bf3fd PL |
698 | } |
699 | break; | |
700 | case RESET_RESET: | |
b97bf3fd PL |
701 | switch (event) { |
702 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
703 | case ACTIVATE_MSG: |
704 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 705 | if (other && link_working_unknown(other)) |
b97bf3fd | 706 | break; |
b97bf3fd PL |
707 | l_ptr->state = WORKING_WORKING; |
708 | l_ptr->fsm_msg_cnt = 0; | |
709 | link_activate(l_ptr); | |
247f0f3c | 710 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd | 711 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 712 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 713 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
714 | link_set_timer(l_ptr, cont_intv); |
715 | break; | |
716 | case RESET_MSG: | |
b97bf3fd PL |
717 | break; |
718 | case TIMEOUT_EVT: | |
247f0f3c YX |
719 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
720 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
721 | l_ptr->fsm_msg_cnt++; |
722 | link_set_timer(l_ptr, cont_intv); | |
b97bf3fd PL |
723 | break; |
724 | default: | |
2cf8aa19 | 725 | pr_err("%s%u in RR state\n", link_unk_evt, event); |
b97bf3fd PL |
726 | } |
727 | break; | |
728 | default: | |
2cf8aa19 | 729 | pr_err("Unknown link state %u/%u\n", l_ptr->state, event); |
b97bf3fd PL |
730 | } |
731 | } | |
732 | ||
4f1688b2 | 733 | /** |
9fbfb8b1 | 734 | * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked |
4f1688b2 | 735 | * @link: link to use |
a6ca1094 YX |
736 | * @list: chain of buffers containing message |
737 | * | |
3127a020 JPM |
738 | * Consumes the buffer chain, except when returning -ELINKCONG, |
739 | * since the caller then may want to make more send attempts. | |
740 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
741 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
4f1688b2 | 742 | */ |
7f9f95d9 YX |
743 | int __tipc_link_xmit(struct net *net, struct tipc_link *link, |
744 | struct sk_buff_head *list) | |
4f1688b2 | 745 | { |
a6ca1094 | 746 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
05dcc5aa | 747 | unsigned int maxwin = link->window; |
e3eea1eb | 748 | unsigned int imp = msg_importance(msg); |
4f1688b2 JPM |
749 | uint mtu = link->max_pkt; |
750 | uint ack = mod(link->next_in_no - 1); | |
751 | uint seqno = link->next_out_no; | |
752 | uint bc_last_in = link->owner->bclink.last_in; | |
753 | struct tipc_media_addr *addr = &link->media_addr; | |
05dcc5aa JPM |
754 | struct sk_buff_head *transmq = &link->transmq; |
755 | struct sk_buff_head *backlogq = &link->backlogq; | |
a6ca1094 | 756 | struct sk_buff *skb, *tmp; |
4f1688b2 | 757 | |
1f66d161 JPM |
758 | /* Match backlog limit against msg importance: */ |
759 | if (unlikely(link->backlog[imp].len >= link->backlog[imp].limit)) | |
3127a020 | 760 | return link_schedule_user(link, list); |
4f1688b2 | 761 | |
05dcc5aa | 762 | if (unlikely(msg_size(msg) > mtu)) { |
a6ca1094 | 763 | __skb_queue_purge(list); |
4f1688b2 JPM |
764 | return -EMSGSIZE; |
765 | } | |
05dcc5aa | 766 | /* Prepare each packet for sending, and add to relevant queue: */ |
a6ca1094 YX |
767 | skb_queue_walk_safe(list, skb, tmp) { |
768 | __skb_unlink(skb, list); | |
58dc55f2 | 769 | msg = buf_msg(skb); |
05dcc5aa JPM |
770 | msg_set_seqno(msg, seqno); |
771 | msg_set_ack(msg, ack); | |
4f1688b2 JPM |
772 | msg_set_bcast_ack(msg, bc_last_in); |
773 | ||
05dcc5aa JPM |
774 | if (likely(skb_queue_len(transmq) < maxwin)) { |
775 | __skb_queue_tail(transmq, skb); | |
776 | tipc_bearer_send(net, link->bearer_id, skb, addr); | |
777 | link->rcv_unacked = 0; | |
778 | seqno++; | |
779 | continue; | |
780 | } | |
781 | if (tipc_msg_bundle(skb_peek_tail(backlogq), skb, mtu)) { | |
4f1688b2 | 782 | link->stats.sent_bundled++; |
4f1688b2 | 783 | continue; |
05dcc5aa JPM |
784 | } |
785 | if (tipc_msg_make_bundle(&skb, mtu, link->addr)) { | |
4f1688b2 JPM |
786 | link->stats.sent_bundled++; |
787 | link->stats.sent_bundles++; | |
1f66d161 | 788 | imp = msg_importance(buf_msg(skb)); |
4f1688b2 | 789 | } |
05dcc5aa | 790 | __skb_queue_tail(backlogq, skb); |
1f66d161 | 791 | link->backlog[imp].len++; |
4f1688b2 | 792 | seqno++; |
4f1688b2 JPM |
793 | } |
794 | link->next_out_no = seqno; | |
4f1688b2 JPM |
795 | return 0; |
796 | } | |
797 | ||
a6ca1094 YX |
798 | static void skb2list(struct sk_buff *skb, struct sk_buff_head *list) |
799 | { | |
c637c103 | 800 | skb_queue_head_init(list); |
a6ca1094 YX |
801 | __skb_queue_tail(list, skb); |
802 | } | |
803 | ||
804 | static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb) | |
805 | { | |
806 | struct sk_buff_head head; | |
807 | ||
808 | skb2list(skb, &head); | |
7f9f95d9 | 809 | return __tipc_link_xmit(link->owner->net, link, &head); |
a6ca1094 YX |
810 | } |
811 | ||
3127a020 JPM |
812 | /* tipc_link_xmit_skb(): send single buffer to destination |
813 | * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE | |
814 | * messages, which will not be rejected | |
815 | * The only exception is datagram messages rerouted after secondary | |
816 | * lookup, which are rare and safe to dispose of anyway. | |
817 | * TODO: Return real return value, and let callers use | |
818 | * tipc_wait_for_sendpkt() where applicable | |
819 | */ | |
f2f9800d YX |
820 | int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode, |
821 | u32 selector) | |
a6ca1094 YX |
822 | { |
823 | struct sk_buff_head head; | |
3127a020 | 824 | int rc; |
a6ca1094 YX |
825 | |
826 | skb2list(skb, &head); | |
3127a020 JPM |
827 | rc = tipc_link_xmit(net, &head, dnode, selector); |
828 | if (rc == -ELINKCONG) | |
829 | kfree_skb(skb); | |
830 | return 0; | |
a6ca1094 YX |
831 | } |
832 | ||
4f1688b2 | 833 | /** |
9fbfb8b1 | 834 | * tipc_link_xmit() is the general link level function for message sending |
f2f9800d | 835 | * @net: the applicable net namespace |
a6ca1094 | 836 | * @list: chain of buffers containing message |
4f1688b2 JPM |
837 | * @dsz: amount of user data to be sent |
838 | * @dnode: address of destination node | |
839 | * @selector: a number used for deterministic link selection | |
840 | * Consumes the buffer chain, except when returning -ELINKCONG | |
841 | * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE | |
842 | */ | |
f2f9800d YX |
843 | int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode, |
844 | u32 selector) | |
4f1688b2 JPM |
845 | { |
846 | struct tipc_link *link = NULL; | |
847 | struct tipc_node *node; | |
848 | int rc = -EHOSTUNREACH; | |
849 | ||
f2f9800d | 850 | node = tipc_node_find(net, dnode); |
4f1688b2 JPM |
851 | if (node) { |
852 | tipc_node_lock(node); | |
853 | link = node->active_links[selector & 1]; | |
854 | if (link) | |
7f9f95d9 | 855 | rc = __tipc_link_xmit(net, link, list); |
4f1688b2 JPM |
856 | tipc_node_unlock(node); |
857 | } | |
4f1688b2 JPM |
858 | if (link) |
859 | return rc; | |
860 | ||
3bd88ee7 EH |
861 | if (likely(in_own_node(net, dnode))) { |
862 | tipc_sk_rcv(net, list); | |
863 | return 0; | |
864 | } | |
4f1688b2 | 865 | |
c637c103 | 866 | __skb_queue_purge(list); |
4f1688b2 JPM |
867 | return rc; |
868 | } | |
869 | ||
c64f7a6a | 870 | /* |
247f0f3c | 871 | * tipc_link_sync_xmit - synchronize broadcast link endpoints. |
c64f7a6a JM |
872 | * |
873 | * Give a newly added peer node the sequence number where it should | |
874 | * start receiving and acking broadcast packets. | |
875 | * | |
876 | * Called with node locked | |
877 | */ | |
25b660c7 | 878 | static void tipc_link_sync_xmit(struct tipc_link *link) |
c64f7a6a | 879 | { |
a6ca1094 | 880 | struct sk_buff *skb; |
c64f7a6a JM |
881 | struct tipc_msg *msg; |
882 | ||
a6ca1094 YX |
883 | skb = tipc_buf_acquire(INT_H_SIZE); |
884 | if (!skb) | |
c64f7a6a JM |
885 | return; |
886 | ||
a6ca1094 | 887 | msg = buf_msg(skb); |
c5898636 | 888 | tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG, |
34747539 | 889 | INT_H_SIZE, link->addr); |
25b660c7 | 890 | msg_set_last_bcast(msg, link->owner->bclink.acked); |
a6ca1094 | 891 | __tipc_link_xmit_skb(link, skb); |
c64f7a6a JM |
892 | } |
893 | ||
894 | /* | |
247f0f3c | 895 | * tipc_link_sync_rcv - synchronize broadcast link endpoints. |
c64f7a6a JM |
896 | * Receive the sequence number where we should start receiving and |
897 | * acking broadcast packets from a newly added peer node, and open | |
898 | * up for reception of such packets. | |
899 | * | |
900 | * Called with node locked | |
901 | */ | |
247f0f3c | 902 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf) |
c64f7a6a JM |
903 | { |
904 | struct tipc_msg *msg = buf_msg(buf); | |
905 | ||
906 | n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); | |
907 | n->bclink.recv_permitted = true; | |
908 | kfree_skb(buf); | |
909 | } | |
910 | ||
c4307285 | 911 | /* |
47b4c9a8 YX |
912 | * tipc_link_push_packets - push unsent packets to bearer |
913 | * | |
914 | * Push out the unsent messages of a link where congestion | |
915 | * has abated. Node is locked. | |
916 | * | |
917 | * Called with node locked | |
b97bf3fd | 918 | */ |
05dcc5aa | 919 | void tipc_link_push_packets(struct tipc_link *link) |
b97bf3fd | 920 | { |
05dcc5aa | 921 | struct sk_buff *skb; |
47b4c9a8 | 922 | struct tipc_msg *msg; |
05dcc5aa | 923 | unsigned int ack = mod(link->next_in_no - 1); |
b97bf3fd | 924 | |
05dcc5aa JPM |
925 | while (skb_queue_len(&link->transmq) < link->window) { |
926 | skb = __skb_dequeue(&link->backlogq); | |
927 | if (!skb) | |
47b4c9a8 | 928 | break; |
05dcc5aa | 929 | msg = buf_msg(skb); |
1f66d161 | 930 | link->backlog[msg_importance(msg)].len--; |
05dcc5aa JPM |
931 | msg_set_ack(msg, ack); |
932 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); | |
933 | link->rcv_unacked = 0; | |
934 | __skb_queue_tail(&link->transmq, skb); | |
935 | tipc_bearer_send(link->owner->net, link->bearer_id, | |
936 | skb, &link->media_addr); | |
b97bf3fd | 937 | } |
b97bf3fd PL |
938 | } |
939 | ||
3f5a12bd | 940 | void tipc_link_reset_all(struct tipc_node *node) |
d356eeba | 941 | { |
d356eeba AS |
942 | char addr_string[16]; |
943 | u32 i; | |
944 | ||
3f5a12bd | 945 | tipc_node_lock(node); |
d356eeba | 946 | |
2cf8aa19 | 947 | pr_warn("Resetting all links to %s\n", |
3f5a12bd | 948 | tipc_addr_string_fill(addr_string, node->addr)); |
d356eeba AS |
949 | |
950 | for (i = 0; i < MAX_BEARERS; i++) { | |
3f5a12bd YX |
951 | if (node->links[i]) { |
952 | link_print(node->links[i], "Resetting link\n"); | |
953 | tipc_link_reset(node->links[i]); | |
d356eeba AS |
954 | } |
955 | } | |
956 | ||
3f5a12bd | 957 | tipc_node_unlock(node); |
d356eeba AS |
958 | } |
959 | ||
a18c4bc3 | 960 | static void link_retransmit_failure(struct tipc_link *l_ptr, |
ae8509c4 | 961 | struct sk_buff *buf) |
d356eeba AS |
962 | { |
963 | struct tipc_msg *msg = buf_msg(buf); | |
1da46568 | 964 | struct net *net = l_ptr->owner->net; |
d356eeba | 965 | |
2cf8aa19 | 966 | pr_warn("Retransmission failure on link <%s>\n", l_ptr->name); |
d356eeba AS |
967 | |
968 | if (l_ptr->addr) { | |
d356eeba | 969 | /* Handle failure on standard link */ |
8d64a5ba | 970 | link_print(l_ptr, "Resetting link\n"); |
d356eeba AS |
971 | tipc_link_reset(l_ptr); |
972 | ||
973 | } else { | |
d356eeba | 974 | /* Handle failure on broadcast link */ |
6c00055a | 975 | struct tipc_node *n_ptr; |
d356eeba AS |
976 | char addr_string[16]; |
977 | ||
2cf8aa19 EH |
978 | pr_info("Msg seq number: %u, ", msg_seqno(msg)); |
979 | pr_cont("Outstanding acks: %lu\n", | |
980 | (unsigned long) TIPC_SKB_CB(buf)->handle); | |
617dbeaa | 981 | |
1da46568 | 982 | n_ptr = tipc_bclink_retransmit_to(net); |
d356eeba AS |
983 | tipc_node_lock(n_ptr); |
984 | ||
c68ca7b7 | 985 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 | 986 | pr_info("Broadcast link info for %s\n", addr_string); |
389dd9bc YX |
987 | pr_info("Reception permitted: %d, Acked: %u\n", |
988 | n_ptr->bclink.recv_permitted, | |
2cf8aa19 EH |
989 | n_ptr->bclink.acked); |
990 | pr_info("Last in: %u, Oos state: %u, Last sent: %u\n", | |
991 | n_ptr->bclink.last_in, | |
992 | n_ptr->bclink.oos_state, | |
993 | n_ptr->bclink.last_sent); | |
d356eeba | 994 | |
d356eeba AS |
995 | tipc_node_unlock(n_ptr); |
996 | ||
1da46568 | 997 | tipc_bclink_set_flags(net, TIPC_BCLINK_RESET); |
d356eeba AS |
998 | l_ptr->stale_count = 0; |
999 | } | |
1000 | } | |
1001 | ||
58dc55f2 | 1002 | void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, |
4323add6 | 1003 | u32 retransmits) |
b97bf3fd PL |
1004 | { |
1005 | struct tipc_msg *msg; | |
1006 | ||
58dc55f2 | 1007 | if (!skb) |
d356eeba AS |
1008 | return; |
1009 | ||
58dc55f2 | 1010 | msg = buf_msg(skb); |
c4307285 | 1011 | |
512137ee EH |
1012 | /* Detect repeated retransmit failures */ |
1013 | if (l_ptr->last_retransmitted == msg_seqno(msg)) { | |
1014 | if (++l_ptr->stale_count > 100) { | |
58dc55f2 | 1015 | link_retransmit_failure(l_ptr, skb); |
512137ee | 1016 | return; |
d356eeba AS |
1017 | } |
1018 | } else { | |
512137ee EH |
1019 | l_ptr->last_retransmitted = msg_seqno(msg); |
1020 | l_ptr->stale_count = 1; | |
b97bf3fd | 1021 | } |
d356eeba | 1022 | |
05dcc5aa JPM |
1023 | skb_queue_walk_from(&l_ptr->transmq, skb) { |
1024 | if (!retransmits) | |
58dc55f2 YX |
1025 | break; |
1026 | msg = buf_msg(skb); | |
b97bf3fd | 1027 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); |
c4307285 | 1028 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
7f9f95d9 YX |
1029 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, |
1030 | &l_ptr->media_addr); | |
3c294cb3 YX |
1031 | retransmits--; |
1032 | l_ptr->stats.retransmitted++; | |
b97bf3fd | 1033 | } |
b97bf3fd PL |
1034 | } |
1035 | ||
8b4ed863 JPM |
1036 | /* link_synch(): check if all packets arrived before the synch |
1037 | * point have been consumed | |
1038 | * Returns true if the parallel links are synched, otherwise false | |
1039 | */ | |
1040 | static bool link_synch(struct tipc_link *l) | |
1041 | { | |
1042 | unsigned int post_synch; | |
1043 | struct tipc_link *pl; | |
1044 | ||
1045 | pl = tipc_parallel_link(l); | |
1046 | if (pl == l) | |
1047 | goto synched; | |
1048 | ||
1049 | /* Was last pre-synch packet added to input queue ? */ | |
1050 | if (less_eq(pl->next_in_no, l->synch_point)) | |
1051 | return false; | |
1052 | ||
1053 | /* Is it still in the input queue ? */ | |
1054 | post_synch = mod(pl->next_in_no - l->synch_point) - 1; | |
1055 | if (skb_queue_len(&pl->inputq) > post_synch) | |
1056 | return false; | |
1057 | synched: | |
1058 | l->flags &= ~LINK_SYNCHING; | |
1059 | return true; | |
1060 | } | |
1061 | ||
f03273f1 YX |
1062 | static void link_retrieve_defq(struct tipc_link *link, |
1063 | struct sk_buff_head *list) | |
b97bf3fd PL |
1064 | { |
1065 | u32 seq_no; | |
1066 | ||
05dcc5aa | 1067 | if (skb_queue_empty(&link->deferdq)) |
f03273f1 YX |
1068 | return; |
1069 | ||
05dcc5aa | 1070 | seq_no = buf_seqno(skb_peek(&link->deferdq)); |
f03273f1 | 1071 | if (seq_no == mod(link->next_in_no)) |
05dcc5aa | 1072 | skb_queue_splice_tail_init(&link->deferdq, list); |
b97bf3fd PL |
1073 | } |
1074 | ||
b02b69c8 | 1075 | /** |
170b3927 | 1076 | * tipc_rcv - process TIPC packets/messages arriving from off-node |
f2f9800d | 1077 | * @net: the applicable net namespace |
f03273f1 | 1078 | * @skb: TIPC packet |
7a2f7d18 | 1079 | * @b_ptr: pointer to bearer message arrived on |
b02b69c8 AS |
1080 | * |
1081 | * Invoked with no locks held. Bearer pointer must point to a valid bearer | |
1082 | * structure (i.e. cannot be NULL), but bearer can be inactive. | |
1083 | */ | |
c93d3baa | 1084 | void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) |
b97bf3fd | 1085 | { |
34747539 | 1086 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
f03273f1 YX |
1087 | struct sk_buff_head head; |
1088 | struct tipc_node *n_ptr; | |
1089 | struct tipc_link *l_ptr; | |
1090 | struct sk_buff *skb1, *tmp; | |
1091 | struct tipc_msg *msg; | |
1092 | u32 seq_no; | |
1093 | u32 ackd; | |
1094 | u32 released; | |
b97bf3fd | 1095 | |
a6ca1094 | 1096 | skb2list(skb, &head); |
85035568 | 1097 | |
f03273f1 | 1098 | while ((skb = __skb_dequeue(&head))) { |
85035568 | 1099 | /* Ensure message is well-formed */ |
cf2157f8 | 1100 | if (unlikely(!tipc_msg_validate(skb))) |
3af390e2 | 1101 | goto discard; |
b97bf3fd | 1102 | |
85035568 | 1103 | /* Handle arrival of a non-unicast link message */ |
f03273f1 | 1104 | msg = buf_msg(skb); |
b97bf3fd | 1105 | if (unlikely(msg_non_seq(msg))) { |
1265a021 | 1106 | if (msg_user(msg) == LINK_CONFIG) |
c93d3baa | 1107 | tipc_disc_rcv(net, skb, b_ptr); |
1265a021 | 1108 | else |
c93d3baa | 1109 | tipc_bclink_rcv(net, skb); |
b97bf3fd PL |
1110 | continue; |
1111 | } | |
c4307285 | 1112 | |
ed33a9c4 | 1113 | /* Discard unicast link messages destined for another node */ |
26008247 | 1114 | if (unlikely(!msg_short(msg) && |
34747539 | 1115 | (msg_destnode(msg) != tn->own_addr))) |
3af390e2 | 1116 | goto discard; |
c4307285 | 1117 | |
5a68d5ee | 1118 | /* Locate neighboring node that sent message */ |
f2f9800d | 1119 | n_ptr = tipc_node_find(net, msg_prevnode(msg)); |
b97bf3fd | 1120 | if (unlikely(!n_ptr)) |
3af390e2 | 1121 | goto discard; |
4323add6 | 1122 | tipc_node_lock(n_ptr); |
85035568 | 1123 | |
b4b56102 | 1124 | /* Locate unicast link endpoint that should handle message */ |
b4b56102 | 1125 | l_ptr = n_ptr->links[b_ptr->identity]; |
3af390e2 | 1126 | if (unlikely(!l_ptr)) |
c637c103 | 1127 | goto unlock; |
5a68d5ee | 1128 | |
b4b56102 | 1129 | /* Verify that communication with node is currently allowed */ |
aecb9bb8 | 1130 | if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) && |
10f465c4 YX |
1131 | msg_user(msg) == LINK_PROTOCOL && |
1132 | (msg_type(msg) == RESET_MSG || | |
1133 | msg_type(msg) == ACTIVATE_MSG) && | |
1134 | !msg_redundant_link(msg)) | |
aecb9bb8 | 1135 | n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN; |
10f465c4 YX |
1136 | |
1137 | if (tipc_node_blocked(n_ptr)) | |
c637c103 | 1138 | goto unlock; |
85035568 AS |
1139 | |
1140 | /* Validate message sequence number info */ | |
85035568 AS |
1141 | seq_no = msg_seqno(msg); |
1142 | ackd = msg_ack(msg); | |
1143 | ||
1144 | /* Release acked messages */ | |
2cdf3918 | 1145 | if (unlikely(n_ptr->bclink.acked != msg_bcast_ack(msg))) |
36559591 | 1146 | tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg)); |
b97bf3fd | 1147 | |
58dc55f2 | 1148 | released = 0; |
05dcc5aa JPM |
1149 | skb_queue_walk_safe(&l_ptr->transmq, skb1, tmp) { |
1150 | if (more(buf_seqno(skb1), ackd)) | |
58dc55f2 | 1151 | break; |
05dcc5aa | 1152 | __skb_unlink(skb1, &l_ptr->transmq); |
58dc55f2 YX |
1153 | kfree_skb(skb1); |
1154 | released = 1; | |
b97bf3fd | 1155 | } |
85035568 AS |
1156 | |
1157 | /* Try sending any messages link endpoint has pending */ | |
05dcc5aa | 1158 | if (unlikely(skb_queue_len(&l_ptr->backlogq))) |
47b4c9a8 | 1159 | tipc_link_push_packets(l_ptr); |
a5377831 | 1160 | |
c637c103 | 1161 | if (released && !skb_queue_empty(&l_ptr->wakeupq)) |
50100a5e | 1162 | link_prepare_wakeup(l_ptr); |
a5377831 | 1163 | |
a5377831 | 1164 | /* Process the incoming packet */ |
3af390e2 YX |
1165 | if (unlikely(!link_working_working(l_ptr))) { |
1166 | if (msg_user(msg) == LINK_PROTOCOL) { | |
c5898636 | 1167 | tipc_link_proto_rcv(l_ptr, skb); |
f03273f1 | 1168 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1169 | skb = NULL; |
1170 | goto unlock; | |
b97bf3fd | 1171 | } |
3af390e2 YX |
1172 | |
1173 | /* Traffic message. Conditionally activate link */ | |
1174 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); | |
1175 | ||
1176 | if (link_working_working(l_ptr)) { | |
1177 | /* Re-insert buffer in front of queue */ | |
f03273f1 | 1178 | __skb_queue_head(&head, skb); |
c637c103 JPM |
1179 | skb = NULL; |
1180 | goto unlock; | |
3af390e2 | 1181 | } |
c637c103 | 1182 | goto unlock; |
3af390e2 YX |
1183 | } |
1184 | ||
1185 | /* Link is now in state WORKING_WORKING */ | |
1186 | if (unlikely(seq_no != mod(l_ptr->next_in_no))) { | |
c5898636 | 1187 | link_handle_out_of_seq_msg(l_ptr, skb); |
f03273f1 | 1188 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1189 | skb = NULL; |
1190 | goto unlock; | |
b97bf3fd | 1191 | } |
8b4ed863 JPM |
1192 | /* Synchronize with parallel link if applicable */ |
1193 | if (unlikely((l_ptr->flags & LINK_SYNCHING) && !msg_dup(msg))) { | |
1194 | link_handle_out_of_seq_msg(l_ptr, skb); | |
1195 | if (link_synch(l_ptr)) | |
1196 | link_retrieve_defq(l_ptr, &head); | |
1197 | skb = NULL; | |
1198 | goto unlock; | |
1199 | } | |
3af390e2 | 1200 | l_ptr->next_in_no++; |
05dcc5aa | 1201 | if (unlikely(!skb_queue_empty(&l_ptr->deferdq))) |
f03273f1 | 1202 | link_retrieve_defq(l_ptr, &head); |
05dcc5aa | 1203 | if (unlikely(++l_ptr->rcv_unacked >= TIPC_MIN_LINK_WIN)) { |
3f53bd8f EH |
1204 | l_ptr->stats.sent_acks++; |
1205 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); | |
1206 | } | |
c637c103 JPM |
1207 | tipc_link_input(l_ptr, skb); |
1208 | skb = NULL; | |
1209 | unlock: | |
3af390e2 YX |
1210 | tipc_node_unlock(n_ptr); |
1211 | discard: | |
c637c103 JPM |
1212 | if (unlikely(skb)) |
1213 | kfree_skb(skb); | |
b97bf3fd | 1214 | } |
b97bf3fd PL |
1215 | } |
1216 | ||
c637c103 | 1217 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1218 | * |
c637c103 | 1219 | * Consumes buffer if message is of right type |
7ae934be EH |
1220 | * Node lock must be held |
1221 | */ | |
c637c103 | 1222 | static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1223 | { |
c637c103 JPM |
1224 | struct tipc_node *node = link->owner; |
1225 | struct tipc_msg *msg = buf_msg(skb); | |
1226 | u32 dport = msg_destport(msg); | |
7ae934be | 1227 | |
7ae934be | 1228 | switch (msg_user(msg)) { |
c637c103 JPM |
1229 | case TIPC_LOW_IMPORTANCE: |
1230 | case TIPC_MEDIUM_IMPORTANCE: | |
1231 | case TIPC_HIGH_IMPORTANCE: | |
1232 | case TIPC_CRITICAL_IMPORTANCE: | |
1233 | case CONN_MANAGER: | |
1234 | if (tipc_skb_queue_tail(&link->inputq, skb, dport)) { | |
1235 | node->inputq = &link->inputq; | |
1236 | node->action_flags |= TIPC_MSG_EVT; | |
7ae934be | 1237 | } |
c637c103 | 1238 | return true; |
7ae934be | 1239 | case NAME_DISTRIBUTOR: |
c637c103 JPM |
1240 | node->bclink.recv_permitted = true; |
1241 | node->namedq = &link->namedq; | |
1242 | skb_queue_tail(&link->namedq, skb); | |
1243 | if (skb_queue_len(&link->namedq) == 1) | |
1244 | node->action_flags |= TIPC_NAMED_MSG_EVT; | |
1245 | return true; | |
1246 | case MSG_BUNDLER: | |
1247 | case CHANGEOVER_PROTOCOL: | |
1248 | case MSG_FRAGMENTER: | |
7ae934be | 1249 | case BCAST_PROTOCOL: |
c637c103 | 1250 | return false; |
7ae934be | 1251 | default: |
c637c103 JPM |
1252 | pr_warn("Dropping received illegal msg type\n"); |
1253 | kfree_skb(skb); | |
1254 | return false; | |
1255 | }; | |
7ae934be | 1256 | } |
c637c103 JPM |
1257 | |
1258 | /* tipc_link_input - process packet that has passed link protocol check | |
1259 | * | |
1260 | * Consumes buffer | |
1261 | * Node lock must be held | |
7ae934be | 1262 | */ |
c637c103 | 1263 | static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1264 | { |
c637c103 JPM |
1265 | struct tipc_node *node = link->owner; |
1266 | struct tipc_msg *msg = buf_msg(skb); | |
1267 | struct sk_buff *iskb; | |
1268 | int pos = 0; | |
1269 | ||
1270 | if (likely(tipc_data_input(link, skb))) | |
1271 | return; | |
7ae934be EH |
1272 | |
1273 | switch (msg_user(msg)) { | |
c637c103 | 1274 | case CHANGEOVER_PROTOCOL: |
8b4ed863 JPM |
1275 | if (msg_dup(msg)) { |
1276 | link->flags |= LINK_SYNCHING; | |
1277 | link->synch_point = msg_seqno(msg_get_wrapped(msg)); | |
1278 | } | |
c637c103 JPM |
1279 | if (!tipc_link_tunnel_rcv(node, &skb)) |
1280 | break; | |
1281 | if (msg_user(buf_msg(skb)) != MSG_BUNDLER) { | |
1282 | tipc_data_input(link, skb); | |
1283 | break; | |
1284 | } | |
1285 | case MSG_BUNDLER: | |
1286 | link->stats.recv_bundles++; | |
1287 | link->stats.recv_bundled += msg_msgcnt(msg); | |
1288 | ||
1289 | while (tipc_msg_extract(skb, &iskb, &pos)) | |
1290 | tipc_data_input(link, iskb); | |
7ae934be | 1291 | break; |
c637c103 JPM |
1292 | case MSG_FRAGMENTER: |
1293 | link->stats.recv_fragments++; | |
1294 | if (tipc_buf_append(&link->reasm_buf, &skb)) { | |
1295 | link->stats.recv_fragmented++; | |
1296 | tipc_data_input(link, skb); | |
1297 | } else if (!link->reasm_buf) { | |
1298 | tipc_link_reset(link); | |
1299 | } | |
7ae934be | 1300 | break; |
c637c103 JPM |
1301 | case BCAST_PROTOCOL: |
1302 | tipc_link_sync_rcv(node, skb); | |
7ae934be EH |
1303 | break; |
1304 | default: | |
c637c103 JPM |
1305 | break; |
1306 | }; | |
7ae934be EH |
1307 | } |
1308 | ||
2c53040f | 1309 | /** |
8809b255 AS |
1310 | * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue |
1311 | * | |
1312 | * Returns increase in queue length (i.e. 0 or 1) | |
b97bf3fd | 1313 | */ |
bc6fecd4 | 1314 | u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) |
b97bf3fd | 1315 | { |
bc6fecd4 YX |
1316 | struct sk_buff *skb1; |
1317 | u32 seq_no = buf_seqno(skb); | |
b97bf3fd PL |
1318 | |
1319 | /* Empty queue ? */ | |
bc6fecd4 YX |
1320 | if (skb_queue_empty(list)) { |
1321 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1322 | return 1; |
1323 | } | |
1324 | ||
1325 | /* Last ? */ | |
bc6fecd4 YX |
1326 | if (less(buf_seqno(skb_peek_tail(list)), seq_no)) { |
1327 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1328 | return 1; |
1329 | } | |
1330 | ||
8809b255 | 1331 | /* Locate insertion point in queue, then insert; discard if duplicate */ |
bc6fecd4 YX |
1332 | skb_queue_walk(list, skb1) { |
1333 | u32 curr_seqno = buf_seqno(skb1); | |
b97bf3fd | 1334 | |
8809b255 | 1335 | if (seq_no == curr_seqno) { |
bc6fecd4 | 1336 | kfree_skb(skb); |
8809b255 | 1337 | return 0; |
b97bf3fd | 1338 | } |
8809b255 AS |
1339 | |
1340 | if (less(seq_no, curr_seqno)) | |
b97bf3fd | 1341 | break; |
8809b255 | 1342 | } |
b97bf3fd | 1343 | |
bc6fecd4 | 1344 | __skb_queue_before(list, skb1, skb); |
8809b255 | 1345 | return 1; |
b97bf3fd PL |
1346 | } |
1347 | ||
8809b255 | 1348 | /* |
b97bf3fd PL |
1349 | * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet |
1350 | */ | |
c5898636 | 1351 | static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr, |
b97bf3fd PL |
1352 | struct sk_buff *buf) |
1353 | { | |
f905730c | 1354 | u32 seq_no = buf_seqno(buf); |
b97bf3fd PL |
1355 | |
1356 | if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) { | |
c5898636 | 1357 | tipc_link_proto_rcv(l_ptr, buf); |
b97bf3fd PL |
1358 | return; |
1359 | } | |
1360 | ||
b97bf3fd | 1361 | /* Record OOS packet arrival (force mismatch on next timeout) */ |
b97bf3fd PL |
1362 | l_ptr->checkpoint--; |
1363 | ||
c4307285 | 1364 | /* |
b97bf3fd PL |
1365 | * Discard packet if a duplicate; otherwise add it to deferred queue |
1366 | * and notify peer of gap as per protocol specification | |
1367 | */ | |
b97bf3fd PL |
1368 | if (less(seq_no, mod(l_ptr->next_in_no))) { |
1369 | l_ptr->stats.duplicates++; | |
5f6d9123 | 1370 | kfree_skb(buf); |
b97bf3fd PL |
1371 | return; |
1372 | } | |
1373 | ||
05dcc5aa | 1374 | if (tipc_link_defer_pkt(&l_ptr->deferdq, buf)) { |
b97bf3fd | 1375 | l_ptr->stats.deferred_recv++; |
05dcc5aa | 1376 | if ((skb_queue_len(&l_ptr->deferdq) % TIPC_MIN_LINK_WIN) == 1) |
247f0f3c | 1377 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); |
bc6fecd4 | 1378 | } else { |
b97bf3fd | 1379 | l_ptr->stats.duplicates++; |
bc6fecd4 | 1380 | } |
b97bf3fd PL |
1381 | } |
1382 | ||
1383 | /* | |
1384 | * Send protocol message to the other endpoint. | |
1385 | */ | |
247f0f3c YX |
1386 | void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg, |
1387 | u32 gap, u32 tolerance, u32 priority, u32 ack_mtu) | |
b97bf3fd | 1388 | { |
1fc54d8f | 1389 | struct sk_buff *buf = NULL; |
b97bf3fd | 1390 | struct tipc_msg *msg = l_ptr->pmsg; |
c4307285 | 1391 | u32 msg_size = sizeof(l_ptr->proto_msg); |
75f0aa49 | 1392 | int r_flag; |
b97bf3fd | 1393 | |
77a7e07a YX |
1394 | /* Don't send protocol message during link changeover */ |
1395 | if (l_ptr->exp_msg_count) | |
b97bf3fd | 1396 | return; |
b4b56102 AS |
1397 | |
1398 | /* Abort non-RESET send if communication with node is prohibited */ | |
10f465c4 | 1399 | if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG)) |
b4b56102 AS |
1400 | return; |
1401 | ||
92d2c905 | 1402 | /* Create protocol message with "out-of-sequence" sequence number */ |
b97bf3fd | 1403 | msg_set_type(msg, msg_typ); |
7a2f7d18 | 1404 | msg_set_net_plane(msg, l_ptr->net_plane); |
7a54d4a9 | 1405 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
1da46568 | 1406 | msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net)); |
b97bf3fd PL |
1407 | |
1408 | if (msg_typ == STATE_MSG) { | |
1409 | u32 next_sent = mod(l_ptr->next_out_no); | |
1410 | ||
4323add6 | 1411 | if (!tipc_link_is_up(l_ptr)) |
b97bf3fd | 1412 | return; |
05dcc5aa JPM |
1413 | if (skb_queue_len(&l_ptr->backlogq)) |
1414 | next_sent = buf_seqno(skb_peek(&l_ptr->backlogq)); | |
b97bf3fd | 1415 | msg_set_next_sent(msg, next_sent); |
05dcc5aa JPM |
1416 | if (!skb_queue_empty(&l_ptr->deferdq)) { |
1417 | u32 rec = buf_seqno(skb_peek(&l_ptr->deferdq)); | |
b97bf3fd PL |
1418 | gap = mod(rec - mod(l_ptr->next_in_no)); |
1419 | } | |
1420 | msg_set_seq_gap(msg, gap); | |
1421 | if (gap) | |
1422 | l_ptr->stats.sent_nacks++; | |
1423 | msg_set_link_tolerance(msg, tolerance); | |
1424 | msg_set_linkprio(msg, priority); | |
1425 | msg_set_max_pkt(msg, ack_mtu); | |
1426 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); | |
1427 | msg_set_probe(msg, probe_msg != 0); | |
c4307285 | 1428 | if (probe_msg) { |
b97bf3fd PL |
1429 | u32 mtu = l_ptr->max_pkt; |
1430 | ||
c4307285 | 1431 | if ((mtu < l_ptr->max_pkt_target) && |
b97bf3fd PL |
1432 | link_working_working(l_ptr) && |
1433 | l_ptr->fsm_msg_cnt) { | |
1434 | msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3; | |
c4307285 YH |
1435 | if (l_ptr->max_pkt_probes == 10) { |
1436 | l_ptr->max_pkt_target = (msg_size - 4); | |
1437 | l_ptr->max_pkt_probes = 0; | |
b97bf3fd | 1438 | msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3; |
c4307285 | 1439 | } |
b97bf3fd | 1440 | l_ptr->max_pkt_probes++; |
c4307285 | 1441 | } |
b97bf3fd PL |
1442 | |
1443 | l_ptr->stats.sent_probes++; | |
c4307285 | 1444 | } |
b97bf3fd PL |
1445 | l_ptr->stats.sent_states++; |
1446 | } else { /* RESET_MSG or ACTIVATE_MSG */ | |
1447 | msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1)); | |
1448 | msg_set_seq_gap(msg, 0); | |
1449 | msg_set_next_sent(msg, 1); | |
f23d9bf2 | 1450 | msg_set_probe(msg, 0); |
b97bf3fd PL |
1451 | msg_set_link_tolerance(msg, l_ptr->tolerance); |
1452 | msg_set_linkprio(msg, l_ptr->priority); | |
1453 | msg_set_max_pkt(msg, l_ptr->max_pkt_target); | |
1454 | } | |
1455 | ||
75f0aa49 AS |
1456 | r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr)); |
1457 | msg_set_redundant_link(msg, r_flag); | |
b97bf3fd | 1458 | msg_set_linkprio(msg, l_ptr->priority); |
92d2c905 | 1459 | msg_set_size(msg, msg_size); |
b97bf3fd PL |
1460 | |
1461 | msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2))); | |
1462 | ||
31e3c3f6 | 1463 | buf = tipc_buf_acquire(msg_size); |
b97bf3fd PL |
1464 | if (!buf) |
1465 | return; | |
1466 | ||
27d7ff46 | 1467 | skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg)); |
796c75d0 | 1468 | buf->priority = TC_PRIO_CONTROL; |
7f9f95d9 YX |
1469 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf, |
1470 | &l_ptr->media_addr); | |
05dcc5aa | 1471 | l_ptr->rcv_unacked = 0; |
5f6d9123 | 1472 | kfree_skb(buf); |
b97bf3fd PL |
1473 | } |
1474 | ||
1475 | /* | |
1476 | * Receive protocol message : | |
c4307285 YH |
1477 | * Note that network plane id propagates through the network, and may |
1478 | * change at any time. The node with lowest address rules | |
b97bf3fd | 1479 | */ |
c5898636 | 1480 | static void tipc_link_proto_rcv(struct tipc_link *l_ptr, |
c93d3baa | 1481 | struct sk_buff *buf) |
b97bf3fd PL |
1482 | { |
1483 | u32 rec_gap = 0; | |
1484 | u32 max_pkt_info; | |
c4307285 | 1485 | u32 max_pkt_ack; |
b97bf3fd PL |
1486 | u32 msg_tol; |
1487 | struct tipc_msg *msg = buf_msg(buf); | |
1488 | ||
77a7e07a YX |
1489 | /* Discard protocol message during link changeover */ |
1490 | if (l_ptr->exp_msg_count) | |
b97bf3fd PL |
1491 | goto exit; |
1492 | ||
7a2f7d18 | 1493 | if (l_ptr->net_plane != msg_net_plane(msg)) |
c5898636 | 1494 | if (link_own_addr(l_ptr) > msg_prevnode(msg)) |
7a2f7d18 | 1495 | l_ptr->net_plane = msg_net_plane(msg); |
b97bf3fd | 1496 | |
b97bf3fd | 1497 | switch (msg_type(msg)) { |
c4307285 | 1498 | |
b97bf3fd | 1499 | case RESET_MSG: |
a686e685 AS |
1500 | if (!link_working_unknown(l_ptr) && |
1501 | (l_ptr->peer_session != INVALID_SESSION)) { | |
641c218d AS |
1502 | if (less_eq(msg_session(msg), l_ptr->peer_session)) |
1503 | break; /* duplicate or old reset: ignore */ | |
b97bf3fd | 1504 | } |
b4b56102 AS |
1505 | |
1506 | if (!msg_redundant_link(msg) && (link_working_working(l_ptr) || | |
1507 | link_working_unknown(l_ptr))) { | |
1508 | /* | |
1509 | * peer has lost contact -- don't allow peer's links | |
1510 | * to reactivate before we recognize loss & clean up | |
1511 | */ | |
ca9cf06a | 1512 | l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN; |
b4b56102 AS |
1513 | } |
1514 | ||
47361c87 AS |
1515 | link_state_event(l_ptr, RESET_MSG); |
1516 | ||
b97bf3fd PL |
1517 | /* fall thru' */ |
1518 | case ACTIVATE_MSG: | |
1519 | /* Update link settings according other endpoint's values */ | |
b97bf3fd PL |
1520 | strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg)); |
1521 | ||
2db9983a AS |
1522 | msg_tol = msg_link_tolerance(msg); |
1523 | if (msg_tol > l_ptr->tolerance) | |
b97bf3fd PL |
1524 | link_set_supervision_props(l_ptr, msg_tol); |
1525 | ||
1526 | if (msg_linkprio(msg) > l_ptr->priority) | |
1527 | l_ptr->priority = msg_linkprio(msg); | |
1528 | ||
1529 | max_pkt_info = msg_max_pkt(msg); | |
c4307285 | 1530 | if (max_pkt_info) { |
b97bf3fd PL |
1531 | if (max_pkt_info < l_ptr->max_pkt_target) |
1532 | l_ptr->max_pkt_target = max_pkt_info; | |
1533 | if (l_ptr->max_pkt > l_ptr->max_pkt_target) | |
1534 | l_ptr->max_pkt = l_ptr->max_pkt_target; | |
1535 | } else { | |
c4307285 | 1536 | l_ptr->max_pkt = l_ptr->max_pkt_target; |
b97bf3fd | 1537 | } |
b97bf3fd | 1538 | |
4d75313c | 1539 | /* Synchronize broadcast link info, if not done previously */ |
7a54d4a9 AS |
1540 | if (!tipc_node_is_up(l_ptr->owner)) { |
1541 | l_ptr->owner->bclink.last_sent = | |
1542 | l_ptr->owner->bclink.last_in = | |
1543 | msg_last_bcast(msg); | |
1544 | l_ptr->owner->bclink.oos_state = 0; | |
1545 | } | |
4d75313c | 1546 | |
b97bf3fd PL |
1547 | l_ptr->peer_session = msg_session(msg); |
1548 | l_ptr->peer_bearer_id = msg_bearer_id(msg); | |
47361c87 AS |
1549 | |
1550 | if (msg_type(msg) == ACTIVATE_MSG) | |
1551 | link_state_event(l_ptr, ACTIVATE_MSG); | |
b97bf3fd PL |
1552 | break; |
1553 | case STATE_MSG: | |
1554 | ||
2db9983a AS |
1555 | msg_tol = msg_link_tolerance(msg); |
1556 | if (msg_tol) | |
b97bf3fd | 1557 | link_set_supervision_props(l_ptr, msg_tol); |
c4307285 YH |
1558 | |
1559 | if (msg_linkprio(msg) && | |
b97bf3fd | 1560 | (msg_linkprio(msg) != l_ptr->priority)) { |
3fa9cacd EH |
1561 | pr_debug("%s<%s>, priority change %u->%u\n", |
1562 | link_rst_msg, l_ptr->name, | |
1563 | l_ptr->priority, msg_linkprio(msg)); | |
b97bf3fd | 1564 | l_ptr->priority = msg_linkprio(msg); |
4323add6 | 1565 | tipc_link_reset(l_ptr); /* Enforce change to take effect */ |
b97bf3fd PL |
1566 | break; |
1567 | } | |
ec37dcd3 JPM |
1568 | |
1569 | /* Record reception; force mismatch at next timeout: */ | |
1570 | l_ptr->checkpoint--; | |
1571 | ||
b97bf3fd PL |
1572 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); |
1573 | l_ptr->stats.recv_states++; | |
1574 | if (link_reset_unknown(l_ptr)) | |
1575 | break; | |
1576 | ||
1577 | if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) { | |
c4307285 | 1578 | rec_gap = mod(msg_next_sent(msg) - |
b97bf3fd PL |
1579 | mod(l_ptr->next_in_no)); |
1580 | } | |
1581 | ||
1582 | max_pkt_ack = msg_max_pkt(msg); | |
c4307285 | 1583 | if (max_pkt_ack > l_ptr->max_pkt) { |
c4307285 YH |
1584 | l_ptr->max_pkt = max_pkt_ack; |
1585 | l_ptr->max_pkt_probes = 0; | |
1586 | } | |
b97bf3fd PL |
1587 | |
1588 | max_pkt_ack = 0; | |
c4307285 | 1589 | if (msg_probe(msg)) { |
b97bf3fd | 1590 | l_ptr->stats.recv_probes++; |
a016892c | 1591 | if (msg_size(msg) > sizeof(l_ptr->proto_msg)) |
c4307285 | 1592 | max_pkt_ack = msg_size(msg); |
c4307285 | 1593 | } |
b97bf3fd PL |
1594 | |
1595 | /* Protocol message before retransmits, reduce loss risk */ | |
389dd9bc | 1596 | if (l_ptr->owner->bclink.recv_permitted) |
c5898636 | 1597 | tipc_bclink_update_link_state(l_ptr->owner, |
7a54d4a9 | 1598 | msg_last_bcast(msg)); |
b97bf3fd PL |
1599 | |
1600 | if (rec_gap || (msg_probe(msg))) { | |
247f0f3c YX |
1601 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, rec_gap, 0, |
1602 | 0, max_pkt_ack); | |
b97bf3fd PL |
1603 | } |
1604 | if (msg_seq_gap(msg)) { | |
b97bf3fd | 1605 | l_ptr->stats.recv_nacks++; |
05dcc5aa | 1606 | tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->transmq), |
4323add6 | 1607 | msg_seq_gap(msg)); |
b97bf3fd PL |
1608 | } |
1609 | break; | |
b97bf3fd PL |
1610 | } |
1611 | exit: | |
5f6d9123 | 1612 | kfree_skb(buf); |
b97bf3fd PL |
1613 | } |
1614 | ||
1615 | ||
170b3927 JPM |
1616 | /* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to |
1617 | * a different bearer. Owner node is locked. | |
b97bf3fd | 1618 | */ |
170b3927 JPM |
1619 | static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr, |
1620 | struct tipc_msg *tunnel_hdr, | |
1621 | struct tipc_msg *msg, | |
1622 | u32 selector) | |
b97bf3fd | 1623 | { |
a18c4bc3 | 1624 | struct tipc_link *tunnel; |
a6ca1094 | 1625 | struct sk_buff *skb; |
b97bf3fd PL |
1626 | u32 length = msg_size(msg); |
1627 | ||
1628 | tunnel = l_ptr->owner->active_links[selector & 1]; | |
5392d646 | 1629 | if (!tipc_link_is_up(tunnel)) { |
2cf8aa19 | 1630 | pr_warn("%stunnel link no longer available\n", link_co_err); |
b97bf3fd | 1631 | return; |
5392d646 | 1632 | } |
b97bf3fd | 1633 | msg_set_size(tunnel_hdr, length + INT_H_SIZE); |
a6ca1094 YX |
1634 | skb = tipc_buf_acquire(length + INT_H_SIZE); |
1635 | if (!skb) { | |
2cf8aa19 | 1636 | pr_warn("%sunable to send tunnel msg\n", link_co_err); |
b97bf3fd | 1637 | return; |
5392d646 | 1638 | } |
a6ca1094 YX |
1639 | skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE); |
1640 | skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length); | |
1641 | __tipc_link_xmit_skb(tunnel, skb); | |
b97bf3fd PL |
1642 | } |
1643 | ||
1644 | ||
170b3927 JPM |
1645 | /* tipc_link_failover_send_queue(): A link has gone down, but a second |
1646 | * link is still active. We can do failover. Tunnel the failing link's | |
1647 | * whole send queue via the remaining link. This way, we don't lose | |
1648 | * any packets, and sequence order is preserved for subsequent traffic | |
1649 | * sent over the remaining link. Owner node is locked. | |
b97bf3fd | 1650 | */ |
170b3927 | 1651 | void tipc_link_failover_send_queue(struct tipc_link *l_ptr) |
b97bf3fd | 1652 | { |
05dcc5aa | 1653 | int msgcount; |
a18c4bc3 | 1654 | struct tipc_link *tunnel = l_ptr->owner->active_links[0]; |
b97bf3fd | 1655 | struct tipc_msg tunnel_hdr; |
58dc55f2 | 1656 | struct sk_buff *skb; |
5392d646 | 1657 | int split_bundles; |
b97bf3fd PL |
1658 | |
1659 | if (!tunnel) | |
1660 | return; | |
1661 | ||
c5898636 | 1662 | tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, CHANGEOVER_PROTOCOL, |
34747539 | 1663 | ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr); |
05dcc5aa | 1664 | skb_queue_splice_tail_init(&l_ptr->backlogq, &l_ptr->transmq); |
1f66d161 | 1665 | tipc_link_purge_backlog(l_ptr); |
05dcc5aa | 1666 | msgcount = skb_queue_len(&l_ptr->transmq); |
b97bf3fd PL |
1667 | msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); |
1668 | msg_set_msgcnt(&tunnel_hdr, msgcount); | |
f131072c | 1669 | |
05dcc5aa | 1670 | if (skb_queue_empty(&l_ptr->transmq)) { |
58dc55f2 YX |
1671 | skb = tipc_buf_acquire(INT_H_SIZE); |
1672 | if (skb) { | |
1673 | skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE); | |
b97bf3fd | 1674 | msg_set_size(&tunnel_hdr, INT_H_SIZE); |
a6ca1094 | 1675 | __tipc_link_xmit_skb(tunnel, skb); |
b97bf3fd | 1676 | } else { |
2cf8aa19 EH |
1677 | pr_warn("%sunable to send changeover msg\n", |
1678 | link_co_err); | |
b97bf3fd PL |
1679 | } |
1680 | return; | |
1681 | } | |
f131072c | 1682 | |
c4307285 | 1683 | split_bundles = (l_ptr->owner->active_links[0] != |
5392d646 AS |
1684 | l_ptr->owner->active_links[1]); |
1685 | ||
05dcc5aa | 1686 | skb_queue_walk(&l_ptr->transmq, skb) { |
58dc55f2 | 1687 | struct tipc_msg *msg = buf_msg(skb); |
b97bf3fd PL |
1688 | |
1689 | if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) { | |
b97bf3fd | 1690 | struct tipc_msg *m = msg_get_wrapped(msg); |
0e65967e | 1691 | unchar *pos = (unchar *)m; |
b97bf3fd | 1692 | |
d788d805 | 1693 | msgcount = msg_msgcnt(msg); |
b97bf3fd | 1694 | while (msgcount--) { |
0e65967e | 1695 | msg_set_seqno(m, msg_seqno(msg)); |
170b3927 JPM |
1696 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m, |
1697 | msg_link_selector(m)); | |
b97bf3fd PL |
1698 | pos += align(msg_size(m)); |
1699 | m = (struct tipc_msg *)pos; | |
1700 | } | |
1701 | } else { | |
170b3927 JPM |
1702 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg, |
1703 | msg_link_selector(msg)); | |
b97bf3fd | 1704 | } |
b97bf3fd PL |
1705 | } |
1706 | } | |
1707 | ||
247f0f3c | 1708 | /* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a |
170b3927 JPM |
1709 | * duplicate of the first link's send queue via the new link. This way, we |
1710 | * are guaranteed that currently queued packets from a socket are delivered | |
1711 | * before future traffic from the same socket, even if this is using the | |
1712 | * new link. The last arriving copy of each duplicate packet is dropped at | |
1713 | * the receiving end by the regular protocol check, so packet cardinality | |
1714 | * and sequence order is preserved per sender/receiver socket pair. | |
1715 | * Owner node is locked. | |
1716 | */ | |
05dcc5aa JPM |
1717 | void tipc_link_dup_queue_xmit(struct tipc_link *link, |
1718 | struct tipc_link *tnl) | |
b97bf3fd | 1719 | { |
58dc55f2 | 1720 | struct sk_buff *skb; |
05dcc5aa JPM |
1721 | struct tipc_msg tnl_hdr; |
1722 | struct sk_buff_head *queue = &link->transmq; | |
1723 | int mcnt; | |
1724 | ||
1725 | tipc_msg_init(link_own_addr(link), &tnl_hdr, CHANGEOVER_PROTOCOL, | |
1726 | DUPLICATE_MSG, INT_H_SIZE, link->addr); | |
1727 | mcnt = skb_queue_len(&link->transmq) + skb_queue_len(&link->backlogq); | |
1728 | msg_set_msgcnt(&tnl_hdr, mcnt); | |
1729 | msg_set_bearer_id(&tnl_hdr, link->peer_bearer_id); | |
1730 | ||
1731 | tunnel_queue: | |
1732 | skb_queue_walk(queue, skb) { | |
58dc55f2 YX |
1733 | struct sk_buff *outskb; |
1734 | struct tipc_msg *msg = buf_msg(skb); | |
05dcc5aa | 1735 | u32 len = msg_size(msg); |
b97bf3fd | 1736 | |
05dcc5aa JPM |
1737 | msg_set_ack(msg, mod(link->next_in_no - 1)); |
1738 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); | |
1739 | msg_set_size(&tnl_hdr, len + INT_H_SIZE); | |
1740 | outskb = tipc_buf_acquire(len + INT_H_SIZE); | |
58dc55f2 | 1741 | if (outskb == NULL) { |
2cf8aa19 EH |
1742 | pr_warn("%sunable to send duplicate msg\n", |
1743 | link_co_err); | |
b97bf3fd PL |
1744 | return; |
1745 | } | |
05dcc5aa JPM |
1746 | skb_copy_to_linear_data(outskb, &tnl_hdr, INT_H_SIZE); |
1747 | skb_copy_to_linear_data_offset(outskb, INT_H_SIZE, | |
1748 | skb->data, len); | |
1749 | __tipc_link_xmit_skb(tnl, outskb); | |
1750 | if (!tipc_link_is_up(link)) | |
b97bf3fd | 1751 | return; |
b97bf3fd | 1752 | } |
05dcc5aa JPM |
1753 | if (queue == &link->backlogq) |
1754 | return; | |
1755 | queue = &link->backlogq; | |
1756 | goto tunnel_queue; | |
b97bf3fd PL |
1757 | } |
1758 | ||
1dab3d5a JPM |
1759 | /* tipc_link_dup_rcv(): Receive a tunnelled DUPLICATE_MSG packet. |
1760 | * Owner node is locked. | |
1761 | */ | |
c1336ee4 JPM |
1762 | static void tipc_link_dup_rcv(struct tipc_link *link, |
1763 | struct sk_buff *skb) | |
1dab3d5a | 1764 | { |
c1336ee4 JPM |
1765 | struct sk_buff *iskb; |
1766 | int pos = 0; | |
1dab3d5a | 1767 | |
c1336ee4 | 1768 | if (!tipc_link_is_up(link)) |
1dab3d5a JPM |
1769 | return; |
1770 | ||
c1336ee4 | 1771 | if (!tipc_msg_extract(skb, &iskb, &pos)) { |
1dab3d5a JPM |
1772 | pr_warn("%sfailed to extract inner dup pkt\n", link_co_err); |
1773 | return; | |
1774 | } | |
c1336ee4 JPM |
1775 | /* Append buffer to deferred queue, if applicable: */ |
1776 | link_handle_out_of_seq_msg(link, iskb); | |
1dab3d5a JPM |
1777 | } |
1778 | ||
f006c9c7 JPM |
1779 | /* tipc_link_failover_rcv(): Receive a tunnelled ORIGINAL_MSG packet |
1780 | * Owner node is locked. | |
1781 | */ | |
1782 | static struct sk_buff *tipc_link_failover_rcv(struct tipc_link *l_ptr, | |
1783 | struct sk_buff *t_buf) | |
1784 | { | |
1785 | struct tipc_msg *t_msg = buf_msg(t_buf); | |
1786 | struct sk_buff *buf = NULL; | |
1787 | struct tipc_msg *msg; | |
c1336ee4 | 1788 | int pos = 0; |
f006c9c7 JPM |
1789 | |
1790 | if (tipc_link_is_up(l_ptr)) | |
1791 | tipc_link_reset(l_ptr); | |
1792 | ||
1793 | /* First failover packet? */ | |
1794 | if (l_ptr->exp_msg_count == START_CHANGEOVER) | |
1795 | l_ptr->exp_msg_count = msg_msgcnt(t_msg); | |
1796 | ||
1797 | /* Should there be an inner packet? */ | |
1798 | if (l_ptr->exp_msg_count) { | |
1799 | l_ptr->exp_msg_count--; | |
c1336ee4 | 1800 | if (!tipc_msg_extract(t_buf, &buf, &pos)) { |
f006c9c7 JPM |
1801 | pr_warn("%sno inner failover pkt\n", link_co_err); |
1802 | goto exit; | |
1803 | } | |
1804 | msg = buf_msg(buf); | |
1805 | ||
1806 | if (less(msg_seqno(msg), l_ptr->reset_checkpoint)) { | |
1807 | kfree_skb(buf); | |
1808 | buf = NULL; | |
1809 | goto exit; | |
1810 | } | |
1811 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
1812 | l_ptr->stats.recv_fragments++; | |
37e22164 | 1813 | tipc_buf_append(&l_ptr->reasm_buf, &buf); |
f006c9c7 JPM |
1814 | } |
1815 | } | |
f006c9c7 | 1816 | exit: |
2d72d495 JPM |
1817 | if ((!l_ptr->exp_msg_count) && (l_ptr->flags & LINK_STOPPED)) |
1818 | tipc_link_delete(l_ptr); | |
f006c9c7 JPM |
1819 | return buf; |
1820 | } | |
1821 | ||
1dab3d5a | 1822 | /* tipc_link_tunnel_rcv(): Receive a tunnelled packet, sent |
170b3927 JPM |
1823 | * via other link as result of a failover (ORIGINAL_MSG) or |
1824 | * a new active link (DUPLICATE_MSG). Failover packets are | |
1825 | * returned to the active link for delivery upwards. | |
1826 | * Owner node is locked. | |
b97bf3fd | 1827 | */ |
c5898636 | 1828 | static int tipc_link_tunnel_rcv(struct tipc_node *n_ptr, |
170b3927 | 1829 | struct sk_buff **buf) |
b97bf3fd | 1830 | { |
02842f71 JPM |
1831 | struct sk_buff *t_buf = *buf; |
1832 | struct tipc_link *l_ptr; | |
1833 | struct tipc_msg *t_msg = buf_msg(t_buf); | |
1834 | u32 bearer_id = msg_bearer_id(t_msg); | |
b97bf3fd | 1835 | |
1e9d47a9 JPM |
1836 | *buf = NULL; |
1837 | ||
cb4b102f DC |
1838 | if (bearer_id >= MAX_BEARERS) |
1839 | goto exit; | |
1dab3d5a | 1840 | |
02842f71 JPM |
1841 | l_ptr = n_ptr->links[bearer_id]; |
1842 | if (!l_ptr) | |
b97bf3fd | 1843 | goto exit; |
b97bf3fd | 1844 | |
02842f71 | 1845 | if (msg_type(t_msg) == DUPLICATE_MSG) |
c5898636 | 1846 | tipc_link_dup_rcv(l_ptr, t_buf); |
02842f71 JPM |
1847 | else if (msg_type(t_msg) == ORIGINAL_MSG) |
1848 | *buf = tipc_link_failover_rcv(l_ptr, t_buf); | |
1e9d47a9 JPM |
1849 | else |
1850 | pr_warn("%sunknown tunnel pkt received\n", link_co_err); | |
b97bf3fd | 1851 | exit: |
02842f71 | 1852 | kfree_skb(t_buf); |
1e9d47a9 | 1853 | return *buf != NULL; |
b97bf3fd PL |
1854 | } |
1855 | ||
2f55c437 | 1856 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol) |
b97bf3fd | 1857 | { |
2f55c437 YX |
1858 | unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; |
1859 | ||
1860 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
5413b4c6 AS |
1861 | return; |
1862 | ||
2f55c437 YX |
1863 | l_ptr->tolerance = tol; |
1864 | l_ptr->cont_intv = msecs_to_jiffies(intv); | |
1865 | l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->cont_intv) / 4); | |
b97bf3fd PL |
1866 | } |
1867 | ||
e3eea1eb | 1868 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1869 | { |
e3eea1eb JPM |
1870 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->max_pkt / ITEM_SIZE); |
1871 | ||
1872 | l->window = win; | |
1f66d161 JPM |
1873 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1874 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1875 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1876 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1877 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1878 | } |
1879 | ||
e099e86c | 1880 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1881 | * @net: the applicable net namespace |
e099e86c JPM |
1882 | * @name: pointer to link name string |
1883 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1884 | * |
e099e86c | 1885 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1886 | */ |
f2f9800d YX |
1887 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1888 | const char *link_name, | |
e099e86c | 1889 | unsigned int *bearer_id) |
b97bf3fd | 1890 | { |
f2f9800d | 1891 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1892 | struct tipc_link *l_ptr; |
bbfbe47c | 1893 | struct tipc_node *n_ptr; |
886eaa1f | 1894 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1895 | int i; |
b97bf3fd | 1896 | |
e099e86c | 1897 | *bearer_id = 0; |
6c7a762e | 1898 | rcu_read_lock(); |
f2f9800d | 1899 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1900 | tipc_node_lock(n_ptr); |
bbfbe47c EH |
1901 | for (i = 0; i < MAX_BEARERS; i++) { |
1902 | l_ptr = n_ptr->links[i]; | |
e099e86c JPM |
1903 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1904 | *bearer_id = i; | |
1905 | found_node = n_ptr; | |
1906 | break; | |
1907 | } | |
bbfbe47c | 1908 | } |
a11607f5 | 1909 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1910 | if (found_node) |
1911 | break; | |
bbfbe47c | 1912 | } |
6c7a762e YX |
1913 | rcu_read_unlock(); |
1914 | ||
e099e86c | 1915 | return found_node; |
b97bf3fd PL |
1916 | } |
1917 | ||
b97bf3fd PL |
1918 | /** |
1919 | * link_reset_statistics - reset link statistics | |
1920 | * @l_ptr: pointer to link | |
1921 | */ | |
a18c4bc3 | 1922 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
1923 | { |
1924 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
1925 | l_ptr->stats.sent_info = l_ptr->next_out_no; | |
1926 | l_ptr->stats.recv_info = l_ptr->next_in_no; | |
1927 | } | |
1928 | ||
a18c4bc3 | 1929 | static void link_print(struct tipc_link *l_ptr, const char *str) |
b97bf3fd | 1930 | { |
7f9f95d9 | 1931 | struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id); |
7a2f7d18 YX |
1932 | struct tipc_bearer *b_ptr; |
1933 | ||
1934 | rcu_read_lock(); | |
7f9f95d9 | 1935 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
1936 | if (b_ptr) |
1937 | pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name); | |
1938 | rcu_read_unlock(); | |
8d64a5ba | 1939 | |
b97bf3fd | 1940 | if (link_working_unknown(l_ptr)) |
5deedde9 | 1941 | pr_cont(":WU\n"); |
8d64a5ba | 1942 | else if (link_reset_reset(l_ptr)) |
5deedde9 | 1943 | pr_cont(":RR\n"); |
8d64a5ba | 1944 | else if (link_reset_unknown(l_ptr)) |
5deedde9 | 1945 | pr_cont(":RU\n"); |
8d64a5ba | 1946 | else if (link_working_working(l_ptr)) |
5deedde9 PG |
1947 | pr_cont(":WW\n"); |
1948 | else | |
1949 | pr_cont("\n"); | |
b97bf3fd | 1950 | } |
0655f6a8 RA |
1951 | |
1952 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1953 | */ | |
1954 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1955 | { | |
1956 | int err; | |
1957 | ||
1958 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1959 | tipc_nl_prop_policy); | |
1960 | if (err) | |
1961 | return err; | |
1962 | ||
1963 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1964 | u32 prio; | |
1965 | ||
1966 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1967 | if (prio > TIPC_MAX_LINK_PRI) | |
1968 | return -EINVAL; | |
1969 | } | |
1970 | ||
1971 | if (props[TIPC_NLA_PROP_TOL]) { | |
1972 | u32 tol; | |
1973 | ||
1974 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1975 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1976 | return -EINVAL; | |
1977 | } | |
1978 | ||
1979 | if (props[TIPC_NLA_PROP_WIN]) { | |
1980 | u32 win; | |
1981 | ||
1982 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1983 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1984 | return -EINVAL; | |
1985 | } | |
1986 | ||
1987 | return 0; | |
1988 | } | |
7be57fc6 | 1989 | |
f96ce7a2 RA |
1990 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
1991 | { | |
1992 | int err; | |
1993 | int res = 0; | |
1994 | int bearer_id; | |
1995 | char *name; | |
1996 | struct tipc_link *link; | |
1997 | struct tipc_node *node; | |
1998 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
37e2d484 | 1999 | struct net *net = sock_net(skb->sk); |
f96ce7a2 RA |
2000 | |
2001 | if (!info->attrs[TIPC_NLA_LINK]) | |
2002 | return -EINVAL; | |
2003 | ||
2004 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2005 | info->attrs[TIPC_NLA_LINK], | |
2006 | tipc_nl_link_policy); | |
2007 | if (err) | |
2008 | return err; | |
2009 | ||
2010 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2011 | return -EINVAL; | |
2012 | ||
2013 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2014 | ||
f2f9800d | 2015 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
2016 | if (!node) |
2017 | return -EINVAL; | |
2018 | ||
2019 | tipc_node_lock(node); | |
2020 | ||
2021 | link = node->links[bearer_id]; | |
2022 | if (!link) { | |
2023 | res = -EINVAL; | |
2024 | goto out; | |
2025 | } | |
2026 | ||
2027 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
2028 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
2029 | ||
2030 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
2031 | props); | |
2032 | if (err) { | |
2033 | res = err; | |
2034 | goto out; | |
2035 | } | |
2036 | ||
2037 | if (props[TIPC_NLA_PROP_TOL]) { | |
2038 | u32 tol; | |
2039 | ||
2040 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
2041 | link_set_supervision_props(link, tol); | |
2042 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0, 0); | |
2043 | } | |
2044 | if (props[TIPC_NLA_PROP_PRIO]) { | |
2045 | u32 prio; | |
2046 | ||
2047 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
2048 | link->priority = prio; | |
2049 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio, 0); | |
2050 | } | |
2051 | if (props[TIPC_NLA_PROP_WIN]) { | |
2052 | u32 win; | |
2053 | ||
2054 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
2055 | tipc_link_set_queue_limits(link, win); | |
2056 | } | |
2057 | } | |
2058 | ||
2059 | out: | |
2060 | tipc_node_unlock(node); | |
2061 | ||
2062 | return res; | |
2063 | } | |
d8182804 RA |
2064 | |
2065 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
2066 | { |
2067 | int i; | |
2068 | struct nlattr *stats; | |
2069 | ||
2070 | struct nla_map { | |
2071 | u32 key; | |
2072 | u32 val; | |
2073 | }; | |
2074 | ||
2075 | struct nla_map map[] = { | |
2076 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
2077 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
2078 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
2079 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
2080 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
2081 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
2082 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
2083 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
2084 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
2085 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
2086 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
2087 | s->msg_length_counts : 1}, | |
2088 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
2089 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
2090 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
2091 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
2092 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
2093 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
2094 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
2095 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
2096 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
2097 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
2098 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
2099 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
2100 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
2101 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
2102 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
2103 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
2104 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
2105 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
2106 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
2107 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
2108 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
2109 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
2110 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
2111 | }; | |
2112 | ||
2113 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
2114 | if (!stats) | |
2115 | return -EMSGSIZE; | |
2116 | ||
2117 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2118 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2119 | goto msg_full; | |
2120 | ||
2121 | nla_nest_end(skb, stats); | |
2122 | ||
2123 | return 0; | |
2124 | msg_full: | |
2125 | nla_nest_cancel(skb, stats); | |
2126 | ||
2127 | return -EMSGSIZE; | |
2128 | } | |
2129 | ||
2130 | /* Caller should hold appropriate locks to protect the link */ | |
34747539 YX |
2131 | static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
2132 | struct tipc_link *link) | |
7be57fc6 RA |
2133 | { |
2134 | int err; | |
2135 | void *hdr; | |
2136 | struct nlattr *attrs; | |
2137 | struct nlattr *prop; | |
34747539 | 2138 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 2139 | |
bfb3e5dd | 2140 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
7be57fc6 RA |
2141 | NLM_F_MULTI, TIPC_NL_LINK_GET); |
2142 | if (!hdr) | |
2143 | return -EMSGSIZE; | |
2144 | ||
2145 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2146 | if (!attrs) | |
2147 | goto msg_full; | |
2148 | ||
2149 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2150 | goto attr_msg_full; | |
2151 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 2152 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 RA |
2153 | goto attr_msg_full; |
2154 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->max_pkt)) | |
2155 | goto attr_msg_full; | |
2156 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no)) | |
2157 | goto attr_msg_full; | |
2158 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->next_out_no)) | |
2159 | goto attr_msg_full; | |
2160 | ||
2161 | if (tipc_link_is_up(link)) | |
2162 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2163 | goto attr_msg_full; | |
2164 | if (tipc_link_is_active(link)) | |
2165 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) | |
2166 | goto attr_msg_full; | |
2167 | ||
2168 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2169 | if (!prop) | |
2170 | goto attr_msg_full; | |
2171 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2172 | goto prop_msg_full; | |
2173 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2174 | goto prop_msg_full; | |
2175 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 2176 | link->window)) |
7be57fc6 RA |
2177 | goto prop_msg_full; |
2178 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2179 | goto prop_msg_full; | |
2180 | nla_nest_end(msg->skb, prop); | |
2181 | ||
2182 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2183 | if (err) | |
2184 | goto attr_msg_full; | |
2185 | ||
2186 | nla_nest_end(msg->skb, attrs); | |
2187 | genlmsg_end(msg->skb, hdr); | |
2188 | ||
2189 | return 0; | |
2190 | ||
2191 | prop_msg_full: | |
2192 | nla_nest_cancel(msg->skb, prop); | |
2193 | attr_msg_full: | |
2194 | nla_nest_cancel(msg->skb, attrs); | |
2195 | msg_full: | |
2196 | genlmsg_cancel(msg->skb, hdr); | |
2197 | ||
2198 | return -EMSGSIZE; | |
2199 | } | |
2200 | ||
2201 | /* Caller should hold node lock */ | |
34747539 YX |
2202 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, |
2203 | struct tipc_node *node, u32 *prev_link) | |
7be57fc6 RA |
2204 | { |
2205 | u32 i; | |
2206 | int err; | |
2207 | ||
2208 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
2209 | *prev_link = i; | |
2210 | ||
2211 | if (!node->links[i]) | |
2212 | continue; | |
2213 | ||
34747539 | 2214 | err = __tipc_nl_add_link(net, msg, node->links[i]); |
7be57fc6 RA |
2215 | if (err) |
2216 | return err; | |
2217 | } | |
2218 | *prev_link = 0; | |
2219 | ||
2220 | return 0; | |
2221 | } | |
2222 | ||
2223 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2224 | { | |
f2f9800d YX |
2225 | struct net *net = sock_net(skb->sk); |
2226 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
2227 | struct tipc_node *node; |
2228 | struct tipc_nl_msg msg; | |
2229 | u32 prev_node = cb->args[0]; | |
2230 | u32 prev_link = cb->args[1]; | |
2231 | int done = cb->args[2]; | |
2232 | int err; | |
2233 | ||
2234 | if (done) | |
2235 | return 0; | |
2236 | ||
2237 | msg.skb = skb; | |
2238 | msg.portid = NETLINK_CB(cb->skb).portid; | |
2239 | msg.seq = cb->nlh->nlmsg_seq; | |
2240 | ||
2241 | rcu_read_lock(); | |
2242 | ||
2243 | if (prev_node) { | |
f2f9800d | 2244 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
2245 | if (!node) { |
2246 | /* We never set seq or call nl_dump_check_consistent() | |
2247 | * this means that setting prev_seq here will cause the | |
2248 | * consistence check to fail in the netlink callback | |
2249 | * handler. Resulting in the last NLMSG_DONE message | |
2250 | * having the NLM_F_DUMP_INTR flag set. | |
2251 | */ | |
2252 | cb->prev_seq = 1; | |
2253 | goto out; | |
2254 | } | |
2255 | ||
f2f9800d YX |
2256 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
2257 | list) { | |
7be57fc6 | 2258 | tipc_node_lock(node); |
34747539 YX |
2259 | err = __tipc_nl_add_node_links(net, &msg, node, |
2260 | &prev_link); | |
7be57fc6 RA |
2261 | tipc_node_unlock(node); |
2262 | if (err) | |
2263 | goto out; | |
2264 | ||
2265 | prev_node = node->addr; | |
2266 | } | |
2267 | } else { | |
1da46568 | 2268 | err = tipc_nl_add_bc_link(net, &msg); |
7be57fc6 RA |
2269 | if (err) |
2270 | goto out; | |
2271 | ||
f2f9800d | 2272 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 | 2273 | tipc_node_lock(node); |
34747539 YX |
2274 | err = __tipc_nl_add_node_links(net, &msg, node, |
2275 | &prev_link); | |
7be57fc6 RA |
2276 | tipc_node_unlock(node); |
2277 | if (err) | |
2278 | goto out; | |
2279 | ||
2280 | prev_node = node->addr; | |
2281 | } | |
2282 | } | |
2283 | done = 1; | |
2284 | out: | |
2285 | rcu_read_unlock(); | |
2286 | ||
2287 | cb->args[0] = prev_node; | |
2288 | cb->args[1] = prev_link; | |
2289 | cb->args[2] = done; | |
2290 | ||
2291 | return skb->len; | |
2292 | } | |
2293 | ||
2294 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
2295 | { | |
f2f9800d | 2296 | struct net *net = genl_info_net(info); |
7be57fc6 RA |
2297 | struct sk_buff *ans_skb; |
2298 | struct tipc_nl_msg msg; | |
2299 | struct tipc_link *link; | |
2300 | struct tipc_node *node; | |
2301 | char *name; | |
2302 | int bearer_id; | |
2303 | int err; | |
2304 | ||
2305 | if (!info->attrs[TIPC_NLA_LINK_NAME]) | |
2306 | return -EINVAL; | |
2307 | ||
2308 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); | |
f2f9800d | 2309 | node = tipc_link_find_owner(net, name, &bearer_id); |
7be57fc6 RA |
2310 | if (!node) |
2311 | return -EINVAL; | |
2312 | ||
2313 | ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2314 | if (!ans_skb) | |
2315 | return -ENOMEM; | |
2316 | ||
2317 | msg.skb = ans_skb; | |
2318 | msg.portid = info->snd_portid; | |
2319 | msg.seq = info->snd_seq; | |
2320 | ||
2321 | tipc_node_lock(node); | |
2322 | link = node->links[bearer_id]; | |
2323 | if (!link) { | |
2324 | err = -EINVAL; | |
2325 | goto err_out; | |
2326 | } | |
2327 | ||
34747539 | 2328 | err = __tipc_nl_add_link(net, &msg, link); |
7be57fc6 RA |
2329 | if (err) |
2330 | goto err_out; | |
2331 | ||
2332 | tipc_node_unlock(node); | |
2333 | ||
2334 | return genlmsg_reply(ans_skb, info); | |
2335 | ||
2336 | err_out: | |
2337 | tipc_node_unlock(node); | |
2338 | nlmsg_free(ans_skb); | |
2339 | ||
2340 | return err; | |
2341 | } | |
ae36342b RA |
2342 | |
2343 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
2344 | { | |
2345 | int err; | |
2346 | char *link_name; | |
2347 | unsigned int bearer_id; | |
2348 | struct tipc_link *link; | |
2349 | struct tipc_node *node; | |
2350 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
1817877b | 2351 | struct net *net = sock_net(skb->sk); |
ae36342b RA |
2352 | |
2353 | if (!info->attrs[TIPC_NLA_LINK]) | |
2354 | return -EINVAL; | |
2355 | ||
2356 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2357 | info->attrs[TIPC_NLA_LINK], | |
2358 | tipc_nl_link_policy); | |
2359 | if (err) | |
2360 | return err; | |
2361 | ||
2362 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2363 | return -EINVAL; | |
2364 | ||
2365 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2366 | ||
2367 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
1da46568 | 2368 | err = tipc_bclink_reset_stats(net); |
ae36342b RA |
2369 | if (err) |
2370 | return err; | |
2371 | return 0; | |
2372 | } | |
2373 | ||
f2f9800d | 2374 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
2375 | if (!node) |
2376 | return -EINVAL; | |
2377 | ||
2378 | tipc_node_lock(node); | |
2379 | ||
2380 | link = node->links[bearer_id]; | |
2381 | if (!link) { | |
2382 | tipc_node_unlock(node); | |
2383 | return -EINVAL; | |
2384 | } | |
2385 | ||
2386 | link_reset_statistics(link); | |
2387 | ||
2388 | tipc_node_unlock(node); | |
2389 | ||
2390 | return 0; | |
2391 | } |