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75da2163 JM |
1 | /* |
2 | * net/tipc/group.c: TIPC group messaging code | |
3 | * | |
4 | * Copyright (c) 2017, Ericsson AB | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions are met: | |
9 | * | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * 3. Neither the names of the copyright holders nor the names of its | |
16 | * contributors may be used to endorse or promote products derived from | |
17 | * this software without specific prior written permission. | |
18 | * | |
19 | * Alternatively, this software may be distributed under the terms of the | |
20 | * GNU General Public License ("GPL") version 2 as published by the Free | |
21 | * Software Foundation. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
24 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
27 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
28 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
29 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
30 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
31 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
32 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
33 | * POSSIBILITY OF SUCH DAMAGE. | |
34 | */ | |
35 | ||
36 | #include "core.h" | |
37 | #include "addr.h" | |
38 | #include "group.h" | |
39 | #include "bcast.h" | |
026321c6 | 40 | #include "topsrv.h" |
75da2163 JM |
41 | #include "msg.h" |
42 | #include "socket.h" | |
43 | #include "node.h" | |
44 | #include "name_table.h" | |
45 | #include "subscr.h" | |
46 | ||
47 | #define ADV_UNIT (((MAX_MSG_SIZE + MAX_H_SIZE) / FLOWCTL_BLK_SZ) + 1) | |
48 | #define ADV_IDLE ADV_UNIT | |
b7d42635 | 49 | #define ADV_ACTIVE (ADV_UNIT * 12) |
75da2163 JM |
50 | |
51 | enum mbr_state { | |
75da2163 JM |
52 | MBR_JOINING, |
53 | MBR_PUBLISHED, | |
54 | MBR_JOINED, | |
04d7b574 JM |
55 | MBR_PENDING, |
56 | MBR_ACTIVE, | |
57 | MBR_RECLAIMING, | |
58 | MBR_REMITTED, | |
75da2163 JM |
59 | MBR_LEAVING |
60 | }; | |
61 | ||
62 | struct tipc_member { | |
63 | struct rb_node tree_node; | |
64 | struct list_head list; | |
38266ca1 | 65 | struct list_head small_win; |
b87a5ea3 | 66 | struct sk_buff_head deferredq; |
b7d42635 | 67 | struct tipc_group *group; |
75da2163 JM |
68 | u32 node; |
69 | u32 port; | |
31c82a2d | 70 | u32 instance; |
75da2163 | 71 | enum mbr_state state; |
b7d42635 JM |
72 | u16 advertised; |
73 | u16 window; | |
75da2163 | 74 | u16 bc_rcv_nxt; |
a3bada70 | 75 | u16 bc_syncpt; |
2f487712 | 76 | u16 bc_acked; |
75da2163 JM |
77 | }; |
78 | ||
79 | struct tipc_group { | |
80 | struct rb_root members; | |
38266ca1 | 81 | struct list_head small_win; |
04d7b574 JM |
82 | struct list_head pending; |
83 | struct list_head active; | |
75da2163 JM |
84 | struct tipc_nlist dests; |
85 | struct net *net; | |
86 | int subid; | |
87 | u32 type; | |
88 | u32 instance; | |
75da2163 JM |
89 | u32 scope; |
90 | u32 portid; | |
91 | u16 member_cnt; | |
04d7b574 JM |
92 | u16 active_cnt; |
93 | u16 max_active; | |
75da2163 | 94 | u16 bc_snd_nxt; |
2f487712 | 95 | u16 bc_ackers; |
60c25306 | 96 | bool *open; |
75da2163 | 97 | bool loopback; |
ae236fb2 | 98 | bool events; |
75da2163 JM |
99 | }; |
100 | ||
101 | static void tipc_group_proto_xmit(struct tipc_group *grp, struct tipc_member *m, | |
102 | int mtyp, struct sk_buff_head *xmitq); | |
103 | ||
eb929a91 JM |
104 | static void tipc_group_open(struct tipc_member *m, bool *wakeup) |
105 | { | |
106 | *wakeup = false; | |
107 | if (list_empty(&m->small_win)) | |
108 | return; | |
109 | list_del_init(&m->small_win); | |
60c25306 | 110 | *m->group->open = true; |
eb929a91 JM |
111 | *wakeup = true; |
112 | } | |
113 | ||
04d7b574 JM |
114 | static void tipc_group_decr_active(struct tipc_group *grp, |
115 | struct tipc_member *m) | |
116 | { | |
f9c935db JM |
117 | if (m->state == MBR_ACTIVE || m->state == MBR_RECLAIMING || |
118 | m->state == MBR_REMITTED) | |
04d7b574 JM |
119 | grp->active_cnt--; |
120 | } | |
121 | ||
b7d42635 JM |
122 | static int tipc_group_rcvbuf_limit(struct tipc_group *grp) |
123 | { | |
04d7b574 | 124 | int max_active, active_pool, idle_pool; |
b7d42635 JM |
125 | int mcnt = grp->member_cnt + 1; |
126 | ||
04d7b574 JM |
127 | /* Limit simultaneous reception from other members */ |
128 | max_active = min(mcnt / 8, 64); | |
129 | max_active = max(max_active, 16); | |
130 | grp->max_active = max_active; | |
131 | ||
132 | /* Reserve blocks for active and idle members */ | |
133 | active_pool = max_active * ADV_ACTIVE; | |
134 | idle_pool = (mcnt - max_active) * ADV_IDLE; | |
135 | ||
b7d42635 | 136 | /* Scale to bytes, considering worst-case truesize/msgsize ratio */ |
04d7b574 | 137 | return (active_pool + idle_pool) * FLOWCTL_BLK_SZ * 4; |
b7d42635 JM |
138 | } |
139 | ||
75da2163 JM |
140 | u16 tipc_group_bc_snd_nxt(struct tipc_group *grp) |
141 | { | |
142 | return grp->bc_snd_nxt; | |
143 | } | |
144 | ||
38266ca1 | 145 | static bool tipc_group_is_receiver(struct tipc_member *m) |
b7d42635 | 146 | { |
0233493a | 147 | return m && m->state != MBR_JOINING && m->state != MBR_LEAVING; |
b7d42635 JM |
148 | } |
149 | ||
38266ca1 | 150 | static bool tipc_group_is_sender(struct tipc_member *m) |
75da2163 | 151 | { |
d12d2e12 | 152 | return m && m->state != MBR_JOINING && m->state != MBR_PUBLISHED; |
75da2163 JM |
153 | } |
154 | ||
ee106d7f JM |
155 | u32 tipc_group_exclude(struct tipc_group *grp) |
156 | { | |
157 | if (!grp->loopback) | |
158 | return grp->portid; | |
159 | return 0; | |
160 | } | |
161 | ||
75da2163 | 162 | struct tipc_group *tipc_group_create(struct net *net, u32 portid, |
60c25306 JM |
163 | struct tipc_group_req *mreq, |
164 | bool *group_is_open) | |
75da2163 | 165 | { |
232d07b7 JM |
166 | u32 filter = TIPC_SUB_PORTS | TIPC_SUB_NO_STATUS; |
167 | bool global = mreq->scope != TIPC_NODE_SCOPE; | |
75da2163 JM |
168 | struct tipc_group *grp; |
169 | u32 type = mreq->type; | |
170 | ||
171 | grp = kzalloc(sizeof(*grp), GFP_ATOMIC); | |
172 | if (!grp) | |
173 | return NULL; | |
174 | tipc_nlist_init(&grp->dests, tipc_own_addr(net)); | |
38266ca1 | 175 | INIT_LIST_HEAD(&grp->small_win); |
04d7b574 JM |
176 | INIT_LIST_HEAD(&grp->active); |
177 | INIT_LIST_HEAD(&grp->pending); | |
75da2163 JM |
178 | grp->members = RB_ROOT; |
179 | grp->net = net; | |
180 | grp->portid = portid; | |
75da2163 JM |
181 | grp->type = type; |
182 | grp->instance = mreq->instance; | |
183 | grp->scope = mreq->scope; | |
184 | grp->loopback = mreq->flags & TIPC_GROUP_LOOPBACK; | |
ae236fb2 | 185 | grp->events = mreq->flags & TIPC_GROUP_MEMBER_EVTS; |
60c25306 | 186 | grp->open = group_is_open; |
1b22bcad | 187 | *grp->open = false; |
232d07b7 JM |
188 | filter |= global ? TIPC_SUB_CLUSTER_SCOPE : TIPC_SUB_NODE_SCOPE; |
189 | if (tipc_topsrv_kern_subscr(net, portid, type, 0, ~0, | |
190 | filter, &grp->subid)) | |
75da2163 JM |
191 | return grp; |
192 | kfree(grp); | |
193 | return NULL; | |
194 | } | |
195 | ||
d12d2e12 JM |
196 | void tipc_group_join(struct net *net, struct tipc_group *grp, int *sk_rcvbuf) |
197 | { | |
198 | struct rb_root *tree = &grp->members; | |
199 | struct tipc_member *m, *tmp; | |
200 | struct sk_buff_head xmitq; | |
201 | ||
e654f9f5 | 202 | __skb_queue_head_init(&xmitq); |
d12d2e12 JM |
203 | rbtree_postorder_for_each_entry_safe(m, tmp, tree, tree_node) { |
204 | tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, &xmitq); | |
205 | tipc_group_update_member(m, 0); | |
206 | } | |
207 | tipc_node_distr_xmit(net, &xmitq); | |
208 | *sk_rcvbuf = tipc_group_rcvbuf_limit(grp); | |
209 | } | |
210 | ||
75da2163 JM |
211 | void tipc_group_delete(struct net *net, struct tipc_group *grp) |
212 | { | |
213 | struct rb_root *tree = &grp->members; | |
214 | struct tipc_member *m, *tmp; | |
215 | struct sk_buff_head xmitq; | |
216 | ||
217 | __skb_queue_head_init(&xmitq); | |
218 | ||
219 | rbtree_postorder_for_each_entry_safe(m, tmp, tree, tree_node) { | |
220 | tipc_group_proto_xmit(grp, m, GRP_LEAVE_MSG, &xmitq); | |
5cf02612 | 221 | __skb_queue_purge(&m->deferredq); |
75da2163 JM |
222 | list_del(&m->list); |
223 | kfree(m); | |
224 | } | |
225 | tipc_node_distr_xmit(net, &xmitq); | |
226 | tipc_nlist_purge(&grp->dests); | |
227 | tipc_topsrv_kern_unsubscr(net, grp->subid); | |
228 | kfree(grp); | |
229 | } | |
230 | ||
e064cce1 Y |
231 | static struct tipc_member *tipc_group_find_member(struct tipc_group *grp, |
232 | u32 node, u32 port) | |
75da2163 JM |
233 | { |
234 | struct rb_node *n = grp->members.rb_node; | |
235 | u64 nkey, key = (u64)node << 32 | port; | |
236 | struct tipc_member *m; | |
237 | ||
238 | while (n) { | |
239 | m = container_of(n, struct tipc_member, tree_node); | |
240 | nkey = (u64)m->node << 32 | m->port; | |
241 | if (key < nkey) | |
242 | n = n->rb_left; | |
243 | else if (key > nkey) | |
244 | n = n->rb_right; | |
245 | else | |
246 | return m; | |
247 | } | |
248 | return NULL; | |
249 | } | |
250 | ||
27bd9ec0 JM |
251 | static struct tipc_member *tipc_group_find_dest(struct tipc_group *grp, |
252 | u32 node, u32 port) | |
253 | { | |
254 | struct tipc_member *m; | |
255 | ||
256 | m = tipc_group_find_member(grp, node, port); | |
38266ca1 | 257 | if (m && tipc_group_is_receiver(m)) |
27bd9ec0 JM |
258 | return m; |
259 | return NULL; | |
260 | } | |
261 | ||
75da2163 JM |
262 | static struct tipc_member *tipc_group_find_node(struct tipc_group *grp, |
263 | u32 node) | |
264 | { | |
265 | struct tipc_member *m; | |
266 | struct rb_node *n; | |
267 | ||
268 | for (n = rb_first(&grp->members); n; n = rb_next(n)) { | |
269 | m = container_of(n, struct tipc_member, tree_node); | |
270 | if (m->node == node) | |
271 | return m; | |
272 | } | |
273 | return NULL; | |
274 | } | |
275 | ||
276 | static void tipc_group_add_to_tree(struct tipc_group *grp, | |
277 | struct tipc_member *m) | |
278 | { | |
279 | u64 nkey, key = (u64)m->node << 32 | m->port; | |
280 | struct rb_node **n, *parent = NULL; | |
281 | struct tipc_member *tmp; | |
282 | ||
283 | n = &grp->members.rb_node; | |
284 | while (*n) { | |
285 | tmp = container_of(*n, struct tipc_member, tree_node); | |
286 | parent = *n; | |
287 | tmp = container_of(parent, struct tipc_member, tree_node); | |
288 | nkey = (u64)tmp->node << 32 | tmp->port; | |
289 | if (key < nkey) | |
290 | n = &(*n)->rb_left; | |
291 | else if (key > nkey) | |
292 | n = &(*n)->rb_right; | |
293 | else | |
294 | return; | |
295 | } | |
296 | rb_link_node(&m->tree_node, parent, n); | |
297 | rb_insert_color(&m->tree_node, &grp->members); | |
298 | } | |
299 | ||
300 | static struct tipc_member *tipc_group_create_member(struct tipc_group *grp, | |
301 | u32 node, u32 port, | |
d12d2e12 | 302 | u32 instance, int state) |
75da2163 JM |
303 | { |
304 | struct tipc_member *m; | |
305 | ||
306 | m = kzalloc(sizeof(*m), GFP_ATOMIC); | |
307 | if (!m) | |
308 | return NULL; | |
309 | INIT_LIST_HEAD(&m->list); | |
38266ca1 | 310 | INIT_LIST_HEAD(&m->small_win); |
b87a5ea3 | 311 | __skb_queue_head_init(&m->deferredq); |
b7d42635 | 312 | m->group = grp; |
75da2163 JM |
313 | m->node = node; |
314 | m->port = port; | |
d12d2e12 | 315 | m->instance = instance; |
2f487712 | 316 | m->bc_acked = grp->bc_snd_nxt - 1; |
75da2163 JM |
317 | grp->member_cnt++; |
318 | tipc_group_add_to_tree(grp, m); | |
319 | tipc_nlist_add(&grp->dests, m->node); | |
320 | m->state = state; | |
321 | return m; | |
322 | } | |
323 | ||
d12d2e12 JM |
324 | void tipc_group_add_member(struct tipc_group *grp, u32 node, |
325 | u32 port, u32 instance) | |
75da2163 | 326 | { |
d12d2e12 | 327 | tipc_group_create_member(grp, node, port, instance, MBR_PUBLISHED); |
75da2163 JM |
328 | } |
329 | ||
330 | static void tipc_group_delete_member(struct tipc_group *grp, | |
331 | struct tipc_member *m) | |
332 | { | |
333 | rb_erase(&m->tree_node, &grp->members); | |
334 | grp->member_cnt--; | |
2f487712 JM |
335 | |
336 | /* Check if we were waiting for replicast ack from this member */ | |
337 | if (grp->bc_ackers && less(m->bc_acked, grp->bc_snd_nxt - 1)) | |
338 | grp->bc_ackers--; | |
339 | ||
75da2163 | 340 | list_del_init(&m->list); |
38266ca1 | 341 | list_del_init(&m->small_win); |
04d7b574 | 342 | tipc_group_decr_active(grp, m); |
75da2163 JM |
343 | |
344 | /* If last member on a node, remove node from dest list */ | |
345 | if (!tipc_group_find_node(grp, m->node)) | |
346 | tipc_nlist_del(&grp->dests, m->node); | |
347 | ||
348 | kfree(m); | |
349 | } | |
350 | ||
351 | struct tipc_nlist *tipc_group_dests(struct tipc_group *grp) | |
352 | { | |
353 | return &grp->dests; | |
354 | } | |
355 | ||
356 | void tipc_group_self(struct tipc_group *grp, struct tipc_name_seq *seq, | |
357 | int *scope) | |
358 | { | |
359 | seq->type = grp->type; | |
360 | seq->lower = grp->instance; | |
361 | seq->upper = grp->instance; | |
362 | *scope = grp->scope; | |
363 | } | |
364 | ||
b7d42635 JM |
365 | void tipc_group_update_member(struct tipc_member *m, int len) |
366 | { | |
367 | struct tipc_group *grp = m->group; | |
368 | struct tipc_member *_m, *tmp; | |
369 | ||
38266ca1 | 370 | if (!tipc_group_is_receiver(m)) |
b7d42635 JM |
371 | return; |
372 | ||
373 | m->window -= len; | |
374 | ||
375 | if (m->window >= ADV_IDLE) | |
376 | return; | |
377 | ||
38266ca1 | 378 | list_del_init(&m->small_win); |
b7d42635 | 379 | |
38266ca1 JM |
380 | /* Sort member into small_window members' list */ |
381 | list_for_each_entry_safe(_m, tmp, &grp->small_win, small_win) { | |
d84d1b3b JM |
382 | if (_m->window > m->window) |
383 | break; | |
b7d42635 | 384 | } |
d84d1b3b | 385 | list_add_tail(&m->small_win, &_m->small_win); |
b7d42635 JM |
386 | } |
387 | ||
2f487712 | 388 | void tipc_group_update_bc_members(struct tipc_group *grp, int len, bool ack) |
75da2163 | 389 | { |
2f487712 | 390 | u16 prev = grp->bc_snd_nxt - 1; |
b7d42635 JM |
391 | struct tipc_member *m; |
392 | struct rb_node *n; | |
0a3d805c | 393 | u16 ackers = 0; |
b7d42635 JM |
394 | |
395 | for (n = rb_first(&grp->members); n; n = rb_next(n)) { | |
396 | m = container_of(n, struct tipc_member, tree_node); | |
38266ca1 | 397 | if (tipc_group_is_receiver(m)) { |
b7d42635 | 398 | tipc_group_update_member(m, len); |
2f487712 | 399 | m->bc_acked = prev; |
0a3d805c | 400 | ackers++; |
2f487712 | 401 | } |
b7d42635 | 402 | } |
2f487712 JM |
403 | |
404 | /* Mark number of acknowledges to expect, if any */ | |
405 | if (ack) | |
0a3d805c | 406 | grp->bc_ackers = ackers; |
75da2163 JM |
407 | grp->bc_snd_nxt++; |
408 | } | |
409 | ||
27bd9ec0 JM |
410 | bool tipc_group_cong(struct tipc_group *grp, u32 dnode, u32 dport, |
411 | int len, struct tipc_member **mbr) | |
b7d42635 | 412 | { |
27bd9ec0 | 413 | struct sk_buff_head xmitq; |
b7d42635 | 414 | struct tipc_member *m; |
27bd9ec0 JM |
415 | int adv, state; |
416 | ||
417 | m = tipc_group_find_dest(grp, dnode, dport); | |
eb929a91 JM |
418 | if (!tipc_group_is_receiver(m)) { |
419 | *mbr = NULL; | |
27bd9ec0 | 420 | return false; |
eb929a91 JM |
421 | } |
422 | *mbr = m; | |
423 | ||
27bd9ec0 JM |
424 | if (m->window >= len) |
425 | return false; | |
eb929a91 | 426 | |
60c25306 | 427 | *grp->open = false; |
27bd9ec0 JM |
428 | |
429 | /* If not fully advertised, do it now to prevent mutual blocking */ | |
430 | adv = m->advertised; | |
431 | state = m->state; | |
27bd9ec0 JM |
432 | if (state == MBR_JOINED && adv == ADV_IDLE) |
433 | return true; | |
04d7b574 JM |
434 | if (state == MBR_ACTIVE && adv == ADV_ACTIVE) |
435 | return true; | |
436 | if (state == MBR_PENDING && adv == ADV_IDLE) | |
437 | return true; | |
e654f9f5 | 438 | __skb_queue_head_init(&xmitq); |
27bd9ec0 JM |
439 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, &xmitq); |
440 | tipc_node_distr_xmit(grp->net, &xmitq); | |
441 | return true; | |
442 | } | |
443 | ||
444 | bool tipc_group_bc_cong(struct tipc_group *grp, int len) | |
445 | { | |
446 | struct tipc_member *m = NULL; | |
b7d42635 | 447 | |
2f487712 | 448 | /* If prev bcast was replicast, reject until all receivers have acked */ |
eb929a91 | 449 | if (grp->bc_ackers) { |
60c25306 | 450 | *grp->open = false; |
2f487712 | 451 | return true; |
eb929a91 | 452 | } |
38266ca1 | 453 | if (list_empty(&grp->small_win)) |
b7d42635 JM |
454 | return false; |
455 | ||
38266ca1 | 456 | m = list_first_entry(&grp->small_win, struct tipc_member, small_win); |
b7d42635 JM |
457 | if (m->window >= len) |
458 | return false; | |
459 | ||
27bd9ec0 | 460 | return tipc_group_cong(grp, m->node, m->port, len, &m); |
b7d42635 JM |
461 | } |
462 | ||
b87a5ea3 JM |
463 | /* tipc_group_sort_msg() - sort msg into queue by bcast sequence number |
464 | */ | |
465 | static void tipc_group_sort_msg(struct sk_buff *skb, struct sk_buff_head *defq) | |
466 | { | |
467 | struct tipc_msg *_hdr, *hdr = buf_msg(skb); | |
468 | u16 bc_seqno = msg_grp_bc_seqno(hdr); | |
469 | struct sk_buff *_skb, *tmp; | |
470 | int mtyp = msg_type(hdr); | |
471 | ||
a3bada70 | 472 | /* Bcast/mcast may be bypassed by ucast or other bcast, - sort it in */ |
b87a5ea3 JM |
473 | if (mtyp == TIPC_GRP_BCAST_MSG || mtyp == TIPC_GRP_MCAST_MSG) { |
474 | skb_queue_walk_safe(defq, _skb, tmp) { | |
475 | _hdr = buf_msg(_skb); | |
476 | if (!less(bc_seqno, msg_grp_bc_seqno(_hdr))) | |
477 | continue; | |
478 | __skb_queue_before(defq, _skb, skb); | |
479 | return; | |
480 | } | |
481 | /* Bcast was not bypassed, - add to tail */ | |
482 | } | |
483 | /* Unicasts are never bypassed, - always add to tail */ | |
484 | __skb_queue_tail(defq, skb); | |
485 | } | |
486 | ||
75da2163 JM |
487 | /* tipc_group_filter_msg() - determine if we should accept arriving message |
488 | */ | |
489 | void tipc_group_filter_msg(struct tipc_group *grp, struct sk_buff_head *inputq, | |
490 | struct sk_buff_head *xmitq) | |
491 | { | |
492 | struct sk_buff *skb = __skb_dequeue(inputq); | |
a3bada70 | 493 | bool ack, deliver, update, leave = false; |
b87a5ea3 | 494 | struct sk_buff_head *defq; |
75da2163 JM |
495 | struct tipc_member *m; |
496 | struct tipc_msg *hdr; | |
497 | u32 node, port; | |
b87a5ea3 | 498 | int mtyp, blks; |
75da2163 JM |
499 | |
500 | if (!skb) | |
501 | return; | |
502 | ||
503 | hdr = buf_msg(skb); | |
75da2163 JM |
504 | node = msg_orignode(hdr); |
505 | port = msg_origport(hdr); | |
506 | ||
507 | if (!msg_in_group(hdr)) | |
508 | goto drop; | |
509 | ||
510 | m = tipc_group_find_member(grp, node, port); | |
38266ca1 | 511 | if (!tipc_group_is_sender(m)) |
75da2163 JM |
512 | goto drop; |
513 | ||
b87a5ea3 JM |
514 | if (less(msg_grp_bc_seqno(hdr), m->bc_rcv_nxt)) |
515 | goto drop; | |
5b8dddb6 | 516 | |
b87a5ea3 JM |
517 | TIPC_SKB_CB(skb)->orig_member = m->instance; |
518 | defq = &m->deferredq; | |
519 | tipc_group_sort_msg(skb, defq); | |
520 | ||
521 | while ((skb = skb_peek(defq))) { | |
522 | hdr = buf_msg(skb); | |
523 | mtyp = msg_type(hdr); | |
2e724dca | 524 | blks = msg_blocks(hdr); |
b87a5ea3 | 525 | deliver = true; |
2f487712 | 526 | ack = false; |
b87a5ea3 JM |
527 | update = false; |
528 | ||
529 | if (more(msg_grp_bc_seqno(hdr), m->bc_rcv_nxt)) | |
530 | break; | |
531 | ||
532 | /* Decide what to do with message */ | |
533 | switch (mtyp) { | |
534 | case TIPC_GRP_MCAST_MSG: | |
535 | if (msg_nameinst(hdr) != grp->instance) { | |
536 | update = true; | |
537 | deliver = false; | |
538 | } | |
539 | /* Fall thru */ | |
540 | case TIPC_GRP_BCAST_MSG: | |
541 | m->bc_rcv_nxt++; | |
2f487712 | 542 | ack = msg_grp_bc_ack_req(hdr); |
b87a5ea3 JM |
543 | break; |
544 | case TIPC_GRP_UCAST_MSG: | |
545 | break; | |
a3bada70 JM |
546 | case TIPC_GRP_MEMBER_EVT: |
547 | if (m->state == MBR_LEAVING) | |
548 | leave = true; | |
549 | if (!grp->events) | |
550 | deliver = false; | |
551 | break; | |
b87a5ea3 JM |
552 | default: |
553 | break; | |
5b8dddb6 | 554 | } |
5b8dddb6 | 555 | |
b87a5ea3 JM |
556 | /* Execute decisions */ |
557 | __skb_dequeue(defq); | |
558 | if (deliver) | |
559 | __skb_queue_tail(inputq, skb); | |
560 | else | |
561 | kfree_skb(skb); | |
562 | ||
2f487712 JM |
563 | if (ack) |
564 | tipc_group_proto_xmit(grp, m, GRP_ACK_MSG, xmitq); | |
565 | ||
a3bada70 | 566 | if (leave) { |
a3bada70 | 567 | __skb_queue_purge(defq); |
e0e853ac | 568 | tipc_group_delete_member(grp, m); |
a3bada70 JM |
569 | break; |
570 | } | |
b87a5ea3 JM |
571 | if (!update) |
572 | continue; | |
75da2163 | 573 | |
b87a5ea3 JM |
574 | tipc_group_update_rcv_win(grp, blks, node, port, xmitq); |
575 | } | |
75da2163 JM |
576 | return; |
577 | drop: | |
578 | kfree_skb(skb); | |
579 | } | |
580 | ||
b7d42635 JM |
581 | void tipc_group_update_rcv_win(struct tipc_group *grp, int blks, u32 node, |
582 | u32 port, struct sk_buff_head *xmitq) | |
583 | { | |
04d7b574 JM |
584 | struct list_head *active = &grp->active; |
585 | int max_active = grp->max_active; | |
586 | int reclaim_limit = max_active * 3 / 4; | |
587 | int active_cnt = grp->active_cnt; | |
f9c935db | 588 | struct tipc_member *m, *rm, *pm; |
b7d42635 JM |
589 | |
590 | m = tipc_group_find_member(grp, node, port); | |
591 | if (!m) | |
592 | return; | |
593 | ||
594 | m->advertised -= blks; | |
595 | ||
596 | switch (m->state) { | |
597 | case MBR_JOINED: | |
4ea5dab5 JM |
598 | /* First, decide if member can go active */ |
599 | if (active_cnt <= max_active) { | |
600 | m->state = MBR_ACTIVE; | |
601 | list_add_tail(&m->list, active); | |
602 | grp->active_cnt++; | |
603 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq); | |
604 | } else { | |
605 | m->state = MBR_PENDING; | |
606 | list_add_tail(&m->list, &grp->pending); | |
607 | } | |
608 | ||
609 | if (active_cnt < reclaim_limit) | |
610 | break; | |
611 | ||
612 | /* Reclaim from oldest active member, if possible */ | |
613 | if (!list_empty(active)) { | |
04d7b574 JM |
614 | rm = list_first_entry(active, struct tipc_member, list); |
615 | rm->state = MBR_RECLAIMING; | |
8d5dee21 | 616 | list_del_init(&rm->list); |
04d7b574 | 617 | tipc_group_proto_xmit(grp, rm, GRP_RECLAIM_MSG, xmitq); |
04d7b574 JM |
618 | break; |
619 | } | |
4ea5dab5 JM |
620 | /* Nobody to reclaim from; - revert oldest pending to JOINED */ |
621 | pm = list_first_entry(&grp->pending, struct tipc_member, list); | |
622 | list_del_init(&pm->list); | |
623 | pm->state = MBR_JOINED; | |
624 | tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq); | |
625 | break; | |
04d7b574 JM |
626 | case MBR_ACTIVE: |
627 | if (!list_is_last(&m->list, &grp->active)) | |
628 | list_move_tail(&m->list, &grp->active); | |
629 | if (m->advertised > (ADV_ACTIVE * 3 / 4)) | |
630 | break; | |
631 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq); | |
632 | break; | |
633 | case MBR_REMITTED: | |
634 | if (m->advertised > ADV_IDLE) | |
635 | break; | |
636 | m->state = MBR_JOINED; | |
8d5dee21 | 637 | grp->active_cnt--; |
04d7b574 JM |
638 | if (m->advertised < ADV_IDLE) { |
639 | pr_warn_ratelimited("Rcv unexpected msg after REMIT\n"); | |
b7d42635 | 640 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq); |
04d7b574 | 641 | } |
8d5dee21 | 642 | |
f9c935db JM |
643 | if (list_empty(&grp->pending)) |
644 | return; | |
645 | ||
646 | /* Set oldest pending member to active and advertise */ | |
647 | pm = list_first_entry(&grp->pending, struct tipc_member, list); | |
648 | pm->state = MBR_ACTIVE; | |
649 | list_move_tail(&pm->list, &grp->active); | |
650 | grp->active_cnt++; | |
651 | tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq); | |
b7d42635 | 652 | break; |
04d7b574 | 653 | case MBR_RECLAIMING: |
b7d42635 JM |
654 | case MBR_JOINING: |
655 | case MBR_LEAVING: | |
656 | default: | |
657 | break; | |
658 | } | |
659 | } | |
660 | ||
7ad32bcb JM |
661 | static void tipc_group_create_event(struct tipc_group *grp, |
662 | struct tipc_member *m, | |
663 | u32 event, u16 seqno, | |
664 | struct sk_buff_head *inputq) | |
665 | { u32 dnode = tipc_own_addr(grp->net); | |
666 | struct tipc_event evt; | |
667 | struct sk_buff *skb; | |
668 | struct tipc_msg *hdr; | |
669 | ||
b06f9d9f | 670 | memset(&evt, 0, sizeof(evt)); |
7ad32bcb JM |
671 | evt.event = event; |
672 | evt.found_lower = m->instance; | |
673 | evt.found_upper = m->instance; | |
674 | evt.port.ref = m->port; | |
675 | evt.port.node = m->node; | |
676 | evt.s.seq.type = grp->type; | |
677 | evt.s.seq.lower = m->instance; | |
678 | evt.s.seq.upper = m->instance; | |
679 | ||
680 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_GRP_MEMBER_EVT, | |
681 | GROUP_H_SIZE, sizeof(evt), dnode, m->node, | |
682 | grp->portid, m->port, 0); | |
683 | if (!skb) | |
684 | return; | |
685 | ||
686 | hdr = buf_msg(skb); | |
687 | msg_set_nametype(hdr, grp->type); | |
688 | msg_set_grp_evt(hdr, event); | |
689 | msg_set_dest_droppable(hdr, true); | |
690 | msg_set_grp_bc_seqno(hdr, seqno); | |
691 | memcpy(msg_data(hdr), &evt, sizeof(evt)); | |
692 | TIPC_SKB_CB(skb)->orig_member = m->instance; | |
693 | __skb_queue_tail(inputq, skb); | |
694 | } | |
695 | ||
75da2163 JM |
696 | static void tipc_group_proto_xmit(struct tipc_group *grp, struct tipc_member *m, |
697 | int mtyp, struct sk_buff_head *xmitq) | |
698 | { | |
699 | struct tipc_msg *hdr; | |
700 | struct sk_buff *skb; | |
b7d42635 | 701 | int adv = 0; |
75da2163 JM |
702 | |
703 | skb = tipc_msg_create(GROUP_PROTOCOL, mtyp, INT_H_SIZE, 0, | |
704 | m->node, tipc_own_addr(grp->net), | |
705 | m->port, grp->portid, 0); | |
706 | if (!skb) | |
707 | return; | |
708 | ||
04d7b574 | 709 | if (m->state == MBR_ACTIVE) |
b7d42635 | 710 | adv = ADV_ACTIVE - m->advertised; |
04d7b574 JM |
711 | else if (m->state == MBR_JOINED || m->state == MBR_PENDING) |
712 | adv = ADV_IDLE - m->advertised; | |
b7d42635 | 713 | |
75da2163 | 714 | hdr = buf_msg(skb); |
b7d42635 JM |
715 | |
716 | if (mtyp == GRP_JOIN_MSG) { | |
75da2163 | 717 | msg_set_grp_bc_syncpt(hdr, grp->bc_snd_nxt); |
b7d42635 JM |
718 | msg_set_adv_win(hdr, adv); |
719 | m->advertised += adv; | |
a3bada70 JM |
720 | } else if (mtyp == GRP_LEAVE_MSG) { |
721 | msg_set_grp_bc_syncpt(hdr, grp->bc_snd_nxt); | |
b7d42635 JM |
722 | } else if (mtyp == GRP_ADV_MSG) { |
723 | msg_set_adv_win(hdr, adv); | |
724 | m->advertised += adv; | |
2f487712 JM |
725 | } else if (mtyp == GRP_ACK_MSG) { |
726 | msg_set_grp_bc_acked(hdr, m->bc_rcv_nxt); | |
04d7b574 JM |
727 | } else if (mtyp == GRP_REMIT_MSG) { |
728 | msg_set_grp_remitted(hdr, m->window); | |
b7d42635 | 729 | } |
23483399 | 730 | msg_set_dest_droppable(hdr, true); |
75da2163 JM |
731 | __skb_queue_tail(xmitq, skb); |
732 | } | |
733 | ||
b7d42635 JM |
734 | void tipc_group_proto_rcv(struct tipc_group *grp, bool *usr_wakeup, |
735 | struct tipc_msg *hdr, struct sk_buff_head *inputq, | |
75da2163 JM |
736 | struct sk_buff_head *xmitq) |
737 | { | |
738 | u32 node = msg_orignode(hdr); | |
739 | u32 port = msg_origport(hdr); | |
04d7b574 | 740 | struct tipc_member *m, *pm; |
04d7b574 | 741 | u16 remitted, in_flight; |
75da2163 JM |
742 | |
743 | if (!grp) | |
744 | return; | |
745 | ||
232d07b7 JM |
746 | if (grp->scope == TIPC_NODE_SCOPE && node != tipc_own_addr(grp->net)) |
747 | return; | |
748 | ||
75da2163 JM |
749 | m = tipc_group_find_member(grp, node, port); |
750 | ||
751 | switch (msg_type(hdr)) { | |
752 | case GRP_JOIN_MSG: | |
753 | if (!m) | |
754 | m = tipc_group_create_member(grp, node, port, | |
d12d2e12 | 755 | 0, MBR_JOINING); |
75da2163 JM |
756 | if (!m) |
757 | return; | |
a3bada70 JM |
758 | m->bc_syncpt = msg_grp_bc_syncpt(hdr); |
759 | m->bc_rcv_nxt = m->bc_syncpt; | |
b7d42635 | 760 | m->window += msg_adv_win(hdr); |
75da2163 | 761 | |
d12d2e12 JM |
762 | /* Wait until PUBLISH event is received if necessary */ |
763 | if (m->state != MBR_PUBLISHED) | |
764 | return; | |
765 | ||
766 | /* Member can be taken into service */ | |
767 | m->state = MBR_JOINED; | |
eb929a91 | 768 | tipc_group_open(m, usr_wakeup); |
bb25c385 | 769 | tipc_group_update_member(m, 0); |
d12d2e12 JM |
770 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq); |
771 | tipc_group_create_event(grp, m, TIPC_PUBLISHED, | |
772 | m->bc_syncpt, inputq); | |
75da2163 JM |
773 | return; |
774 | case GRP_LEAVE_MSG: | |
775 | if (!m) | |
776 | return; | |
a3bada70 | 777 | m->bc_syncpt = msg_grp_bc_syncpt(hdr); |
3f42f5fe | 778 | list_del_init(&m->list); |
eb929a91 | 779 | tipc_group_open(m, usr_wakeup); |
c2b22bcf JM |
780 | tipc_group_decr_active(grp, m); |
781 | m->state = MBR_LEAVING; | |
7ad32bcb JM |
782 | tipc_group_create_event(grp, m, TIPC_WITHDRAWN, |
783 | m->bc_syncpt, inputq); | |
b7d42635 JM |
784 | return; |
785 | case GRP_ADV_MSG: | |
786 | if (!m) | |
787 | return; | |
788 | m->window += msg_adv_win(hdr); | |
eb929a91 | 789 | tipc_group_open(m, usr_wakeup); |
75da2163 | 790 | return; |
2f487712 JM |
791 | case GRP_ACK_MSG: |
792 | if (!m) | |
793 | return; | |
794 | m->bc_acked = msg_grp_bc_acked(hdr); | |
795 | if (--grp->bc_ackers) | |
eb929a91 JM |
796 | return; |
797 | list_del_init(&m->small_win); | |
60c25306 | 798 | *m->group->open = true; |
2f487712 | 799 | *usr_wakeup = true; |
eb929a91 | 800 | tipc_group_update_member(m, 0); |
2f487712 | 801 | return; |
04d7b574 JM |
802 | case GRP_RECLAIM_MSG: |
803 | if (!m) | |
804 | return; | |
04d7b574 JM |
805 | tipc_group_proto_xmit(grp, m, GRP_REMIT_MSG, xmitq); |
806 | m->window = ADV_IDLE; | |
eb929a91 | 807 | tipc_group_open(m, usr_wakeup); |
04d7b574 JM |
808 | return; |
809 | case GRP_REMIT_MSG: | |
810 | if (!m || m->state != MBR_RECLAIMING) | |
811 | return; | |
812 | ||
04d7b574 JM |
813 | remitted = msg_grp_remitted(hdr); |
814 | ||
815 | /* Messages preceding the REMIT still in receive queue */ | |
816 | if (m->advertised > remitted) { | |
817 | m->state = MBR_REMITTED; | |
818 | in_flight = m->advertised - remitted; | |
f9c935db JM |
819 | m->advertised = ADV_IDLE + in_flight; |
820 | return; | |
04d7b574 | 821 | } |
8d5dee21 | 822 | /* This should never happen */ |
04d7b574 | 823 | if (m->advertised < remitted) |
8d5dee21 | 824 | pr_warn_ratelimited("Unexpected REMIT msg\n"); |
04d7b574 | 825 | |
8d5dee21 JM |
826 | /* All messages preceding the REMIT have been read */ |
827 | m->state = MBR_JOINED; | |
f9c935db | 828 | grp->active_cnt--; |
8d5dee21 | 829 | m->advertised = ADV_IDLE; |
04d7b574 JM |
830 | |
831 | /* Set oldest pending member to active and advertise */ | |
832 | if (list_empty(&grp->pending)) | |
833 | return; | |
834 | pm = list_first_entry(&grp->pending, struct tipc_member, list); | |
835 | pm->state = MBR_ACTIVE; | |
836 | list_move_tail(&pm->list, &grp->active); | |
837 | grp->active_cnt++; | |
838 | if (pm->advertised <= (ADV_ACTIVE * 3 / 4)) | |
839 | tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq); | |
840 | return; | |
75da2163 JM |
841 | default: |
842 | pr_warn("Received unknown GROUP_PROTO message\n"); | |
843 | } | |
844 | } | |
845 | ||
b7d42635 JM |
846 | /* tipc_group_member_evt() - receive and handle a member up/down event |
847 | */ | |
75da2163 | 848 | void tipc_group_member_evt(struct tipc_group *grp, |
b7d42635 JM |
849 | bool *usr_wakeup, |
850 | int *sk_rcvbuf, | |
7ad32bcb | 851 | struct tipc_msg *hdr, |
ae236fb2 | 852 | struct sk_buff_head *inputq, |
75da2163 JM |
853 | struct sk_buff_head *xmitq) |
854 | { | |
75da2163 | 855 | struct tipc_event *evt = (void *)msg_data(hdr); |
ae236fb2 | 856 | u32 instance = evt->found_lower; |
75da2163 JM |
857 | u32 node = evt->port.node; |
858 | u32 port = evt->port.ref; | |
ae236fb2 | 859 | int event = evt->event; |
75da2163 JM |
860 | struct tipc_member *m; |
861 | struct net *net; | |
862 | u32 self; | |
863 | ||
864 | if (!grp) | |
7ad32bcb | 865 | return; |
75da2163 JM |
866 | |
867 | net = grp->net; | |
868 | self = tipc_own_addr(net); | |
869 | if (!grp->loopback && node == self && port == grp->portid) | |
7ad32bcb | 870 | return; |
ae236fb2 | 871 | |
75da2163 JM |
872 | m = tipc_group_find_member(grp, node, port); |
873 | ||
d12d2e12 JM |
874 | switch (event) { |
875 | case TIPC_PUBLISHED: | |
876 | /* Send and wait for arrival of JOIN message if necessary */ | |
877 | if (!m) { | |
878 | m = tipc_group_create_member(grp, node, port, instance, | |
879 | MBR_PUBLISHED); | |
880 | if (!m) | |
881 | break; | |
882 | tipc_group_update_member(m, 0); | |
883 | tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq); | |
884 | break; | |
885 | } | |
7ad32bcb | 886 | |
d12d2e12 JM |
887 | if (m->state != MBR_JOINING) |
888 | break; | |
75da2163 | 889 | |
d12d2e12 JM |
890 | /* Member can be taken into service */ |
891 | m->instance = instance; | |
892 | m->state = MBR_JOINED; | |
eb929a91 | 893 | tipc_group_open(m, usr_wakeup); |
d84d1b3b | 894 | tipc_group_update_member(m, 0); |
d12d2e12 JM |
895 | tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq); |
896 | tipc_group_create_event(grp, m, TIPC_PUBLISHED, | |
897 | m->bc_syncpt, inputq); | |
898 | break; | |
899 | case TIPC_WITHDRAWN: | |
75da2163 | 900 | if (!m) |
d12d2e12 | 901 | break; |
ae236fb2 | 902 | |
c2b22bcf JM |
903 | tipc_group_decr_active(grp, m); |
904 | m->state = MBR_LEAVING; | |
3f42f5fe | 905 | list_del_init(&m->list); |
eb929a91 | 906 | tipc_group_open(m, usr_wakeup); |
c2b22bcf JM |
907 | |
908 | /* Only send event if no LEAVE message can be expected */ | |
909 | if (!tipc_node_is_up(net, node)) | |
910 | tipc_group_create_event(grp, m, TIPC_WITHDRAWN, | |
911 | m->bc_rcv_nxt, inputq); | |
d12d2e12 JM |
912 | break; |
913 | default: | |
914 | break; | |
75da2163 | 915 | } |
b7d42635 | 916 | *sk_rcvbuf = tipc_group_rcvbuf_limit(grp); |
75da2163 | 917 | } |
a1be5a20 GM |
918 | |
919 | int tipc_group_fill_sock_diag(struct tipc_group *grp, struct sk_buff *skb) | |
920 | { | |
ae0be8de | 921 | struct nlattr *group = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_GROUP); |
a1be5a20 | 922 | |
4589e28d KL |
923 | if (!group) |
924 | return -EMSGSIZE; | |
925 | ||
a1be5a20 GM |
926 | if (nla_put_u32(skb, TIPC_NLA_SOCK_GROUP_ID, |
927 | grp->type) || | |
928 | nla_put_u32(skb, TIPC_NLA_SOCK_GROUP_INSTANCE, | |
929 | grp->instance) || | |
930 | nla_put_u32(skb, TIPC_NLA_SOCK_GROUP_BC_SEND_NEXT, | |
931 | grp->bc_snd_nxt)) | |
932 | goto group_msg_cancel; | |
933 | ||
934 | if (grp->scope == TIPC_NODE_SCOPE) | |
935 | if (nla_put_flag(skb, TIPC_NLA_SOCK_GROUP_NODE_SCOPE)) | |
936 | goto group_msg_cancel; | |
937 | ||
938 | if (grp->scope == TIPC_CLUSTER_SCOPE) | |
939 | if (nla_put_flag(skb, TIPC_NLA_SOCK_GROUP_CLUSTER_SCOPE)) | |
940 | goto group_msg_cancel; | |
941 | ||
942 | if (*grp->open) | |
943 | if (nla_put_flag(skb, TIPC_NLA_SOCK_GROUP_OPEN)) | |
944 | goto group_msg_cancel; | |
945 | ||
946 | nla_nest_end(skb, group); | |
947 | return 0; | |
948 | ||
949 | group_msg_cancel: | |
950 | nla_nest_cancel(skb, group); | |
951 | return -1; | |
952 | } |