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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" | |
40 | #include "server.h" | |
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 JM |
162 | int tipc_group_size(struct tipc_group *grp) |
163 | { | |
164 | return grp->member_cnt; | |
165 | } | |
166 | ||
167 | struct tipc_group *tipc_group_create(struct net *net, u32 portid, | |
60c25306 JM |
168 | struct tipc_group_req *mreq, |
169 | bool *group_is_open) | |
75da2163 | 170 | { |
232d07b7 JM |
171 | u32 filter = TIPC_SUB_PORTS | TIPC_SUB_NO_STATUS; |
172 | bool global = mreq->scope != TIPC_NODE_SCOPE; | |
75da2163 JM |
173 | struct tipc_group *grp; |
174 | u32 type = mreq->type; | |
175 | ||
176 | grp = kzalloc(sizeof(*grp), GFP_ATOMIC); | |
177 | if (!grp) | |
178 | return NULL; | |
179 | tipc_nlist_init(&grp->dests, tipc_own_addr(net)); | |
38266ca1 | 180 | INIT_LIST_HEAD(&grp->small_win); |
04d7b574 JM |
181 | INIT_LIST_HEAD(&grp->active); |
182 | INIT_LIST_HEAD(&grp->pending); | |
75da2163 JM |
183 | grp->members = RB_ROOT; |
184 | grp->net = net; | |
185 | grp->portid = portid; | |
75da2163 JM |
186 | grp->type = type; |
187 | grp->instance = mreq->instance; | |
188 | grp->scope = mreq->scope; | |
189 | grp->loopback = mreq->flags & TIPC_GROUP_LOOPBACK; | |
ae236fb2 | 190 | grp->events = mreq->flags & TIPC_GROUP_MEMBER_EVTS; |
60c25306 | 191 | grp->open = group_is_open; |
232d07b7 JM |
192 | filter |= global ? TIPC_SUB_CLUSTER_SCOPE : TIPC_SUB_NODE_SCOPE; |
193 | if (tipc_topsrv_kern_subscr(net, portid, type, 0, ~0, | |
194 | filter, &grp->subid)) | |
75da2163 JM |
195 | return grp; |
196 | kfree(grp); | |
197 | return NULL; | |
198 | } | |
199 | ||
d12d2e12 JM |
200 | void tipc_group_join(struct net *net, struct tipc_group *grp, int *sk_rcvbuf) |
201 | { | |
202 | struct rb_root *tree = &grp->members; | |
203 | struct tipc_member *m, *tmp; | |
204 | struct sk_buff_head xmitq; | |
205 | ||
206 | skb_queue_head_init(&xmitq); | |
207 | rbtree_postorder_for_each_entry_safe(m, tmp, tree, tree_node) { | |
208 | tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, &xmitq); | |
209 | tipc_group_update_member(m, 0); | |
210 | } | |
211 | tipc_node_distr_xmit(net, &xmitq); | |
212 | *sk_rcvbuf = tipc_group_rcvbuf_limit(grp); | |
213 | } | |
214 | ||
75da2163 JM |
215 | void tipc_group_delete(struct net *net, struct tipc_group *grp) |
216 | { | |
217 | struct rb_root *tree = &grp->members; | |
218 | struct tipc_member *m, *tmp; | |
219 | struct sk_buff_head xmitq; | |
220 | ||
221 | __skb_queue_head_init(&xmitq); | |
222 | ||
223 | rbtree_postorder_for_each_entry_safe(m, tmp, tree, tree_node) { | |
224 | tipc_group_proto_xmit(grp, m, GRP_LEAVE_MSG, &xmitq); | |
225 | list_del(&m->list); | |
226 | kfree(m); | |
227 | } | |
228 | tipc_node_distr_xmit(net, &xmitq); | |
229 | tipc_nlist_purge(&grp->dests); | |
230 | tipc_topsrv_kern_unsubscr(net, grp->subid); | |
231 | kfree(grp); | |
232 | } | |
233 | ||
234 | struct tipc_member *tipc_group_find_member(struct tipc_group *grp, | |
235 | u32 node, u32 port) | |
236 | { | |
237 | struct rb_node *n = grp->members.rb_node; | |
238 | u64 nkey, key = (u64)node << 32 | port; | |
239 | struct tipc_member *m; | |
240 | ||
241 | while (n) { | |
242 | m = container_of(n, struct tipc_member, tree_node); | |
243 | nkey = (u64)m->node << 32 | m->port; | |
244 | if (key < nkey) | |
245 | n = n->rb_left; | |
246 | else if (key > nkey) | |
247 | n = n->rb_right; | |
248 | else | |
249 | return m; | |
250 | } | |
251 | return NULL; | |
252 | } | |
253 | ||
27bd9ec0 JM |
254 | static struct tipc_member *tipc_group_find_dest(struct tipc_group *grp, |
255 | u32 node, u32 port) | |
256 | { | |
257 | struct tipc_member *m; | |
258 | ||
259 | m = tipc_group_find_member(grp, node, port); | |
38266ca1 | 260 | if (m && tipc_group_is_receiver(m)) |
27bd9ec0 JM |
261 | return m; |
262 | return NULL; | |
263 | } | |
264 | ||
75da2163 JM |
265 | static struct tipc_member *tipc_group_find_node(struct tipc_group *grp, |
266 | u32 node) | |
267 | { | |
268 | struct tipc_member *m; | |
269 | struct rb_node *n; | |
270 | ||
271 | for (n = rb_first(&grp->members); n; n = rb_next(n)) { | |
272 | m = container_of(n, struct tipc_member, tree_node); | |
273 | if (m->node == node) | |
274 | return m; | |
275 | } | |
276 | return NULL; | |
277 | } | |
278 | ||
279 | static void tipc_group_add_to_tree(struct tipc_group *grp, | |
280 | struct tipc_member *m) | |
281 | { | |
282 | u64 nkey, key = (u64)m->node << 32 | m->port; | |
283 | struct rb_node **n, *parent = NULL; | |
284 | struct tipc_member *tmp; | |
285 | ||
286 | n = &grp->members.rb_node; | |
287 | while (*n) { | |
288 | tmp = container_of(*n, struct tipc_member, tree_node); | |
289 | parent = *n; | |
290 | tmp = container_of(parent, struct tipc_member, tree_node); | |
291 | nkey = (u64)tmp->node << 32 | tmp->port; | |
292 | if (key < nkey) | |
293 | n = &(*n)->rb_left; | |
294 | else if (key > nkey) | |
295 | n = &(*n)->rb_right; | |
296 | else | |
297 | return; | |
298 | } | |
299 | rb_link_node(&m->tree_node, parent, n); | |
300 | rb_insert_color(&m->tree_node, &grp->members); | |
301 | } | |
302 | ||
303 | static struct tipc_member *tipc_group_create_member(struct tipc_group *grp, | |
304 | u32 node, u32 port, | |
d12d2e12 | 305 | u32 instance, int state) |
75da2163 JM |
306 | { |
307 | struct tipc_member *m; | |
308 | ||
309 | m = kzalloc(sizeof(*m), GFP_ATOMIC); | |
310 | if (!m) | |
311 | return NULL; | |
312 | INIT_LIST_HEAD(&m->list); | |
38266ca1 | 313 | INIT_LIST_HEAD(&m->small_win); |
b87a5ea3 | 314 | __skb_queue_head_init(&m->deferredq); |
b7d42635 | 315 | m->group = grp; |
75da2163 JM |
316 | m->node = node; |
317 | m->port = port; | |
d12d2e12 | 318 | m->instance = instance; |
2f487712 | 319 | m->bc_acked = grp->bc_snd_nxt - 1; |
75da2163 JM |
320 | grp->member_cnt++; |
321 | tipc_group_add_to_tree(grp, m); | |
322 | tipc_nlist_add(&grp->dests, m->node); | |
323 | m->state = state; | |
324 | return m; | |
325 | } | |
326 | ||
d12d2e12 JM |
327 | void tipc_group_add_member(struct tipc_group *grp, u32 node, |
328 | u32 port, u32 instance) | |
75da2163 | 329 | { |
d12d2e12 | 330 | tipc_group_create_member(grp, node, port, instance, MBR_PUBLISHED); |
75da2163 JM |
331 | } |
332 | ||
333 | static void tipc_group_delete_member(struct tipc_group *grp, | |
334 | struct tipc_member *m) | |
335 | { | |
336 | rb_erase(&m->tree_node, &grp->members); | |
337 | grp->member_cnt--; | |
2f487712 JM |
338 | |
339 | /* Check if we were waiting for replicast ack from this member */ | |
340 | if (grp->bc_ackers && less(m->bc_acked, grp->bc_snd_nxt - 1)) | |
341 | grp->bc_ackers--; | |
342 | ||
75da2163 | 343 | list_del_init(&m->list); |
38266ca1 | 344 | list_del_init(&m->small_win); |
04d7b574 | 345 | tipc_group_decr_active(grp, m); |
75da2163 JM |
346 | |
347 | /* If last member on a node, remove node from dest list */ | |
348 | if (!tipc_group_find_node(grp, m->node)) | |
349 | tipc_nlist_del(&grp->dests, m->node); | |
350 | ||
351 | kfree(m); | |
352 | } | |
353 | ||
354 | struct tipc_nlist *tipc_group_dests(struct tipc_group *grp) | |
355 | { | |
356 | return &grp->dests; | |
357 | } | |
358 | ||
359 | void tipc_group_self(struct tipc_group *grp, struct tipc_name_seq *seq, | |
360 | int *scope) | |
361 | { | |
362 | seq->type = grp->type; | |
363 | seq->lower = grp->instance; | |
364 | seq->upper = grp->instance; | |
365 | *scope = grp->scope; | |
366 | } | |
367 | ||
b7d42635 JM |
368 | void tipc_group_update_member(struct tipc_member *m, int len) |
369 | { | |
370 | struct tipc_group *grp = m->group; | |
371 | struct tipc_member *_m, *tmp; | |
372 | ||
38266ca1 | 373 | if (!tipc_group_is_receiver(m)) |
b7d42635 JM |
374 | return; |
375 | ||
376 | m->window -= len; | |
377 | ||
378 | if (m->window >= ADV_IDLE) | |
379 | return; | |
380 | ||
38266ca1 | 381 | list_del_init(&m->small_win); |
b7d42635 | 382 | |
38266ca1 JM |
383 | /* Sort member into small_window members' list */ |
384 | list_for_each_entry_safe(_m, tmp, &grp->small_win, small_win) { | |
d84d1b3b JM |
385 | if (_m->window > m->window) |
386 | break; | |
b7d42635 | 387 | } |
d84d1b3b | 388 | list_add_tail(&m->small_win, &_m->small_win); |
b7d42635 JM |
389 | } |
390 | ||
2f487712 | 391 | void tipc_group_update_bc_members(struct tipc_group *grp, int len, bool ack) |
75da2163 | 392 | { |
2f487712 | 393 | u16 prev = grp->bc_snd_nxt - 1; |
b7d42635 JM |
394 | struct tipc_member *m; |
395 | struct rb_node *n; | |
0a3d805c | 396 | u16 ackers = 0; |
b7d42635 JM |
397 | |
398 | for (n = rb_first(&grp->members); n; n = rb_next(n)) { | |
399 | m = container_of(n, struct tipc_member, tree_node); | |
38266ca1 | 400 | if (tipc_group_is_receiver(m)) { |
b7d42635 | 401 | tipc_group_update_member(m, len); |
2f487712 | 402 | m->bc_acked = prev; |
0a3d805c | 403 | ackers++; |
2f487712 | 404 | } |
b7d42635 | 405 | } |
2f487712 JM |
406 | |
407 | /* Mark number of acknowledges to expect, if any */ | |
408 | if (ack) | |
0a3d805c | 409 | grp->bc_ackers = ackers; |
75da2163 JM |
410 | grp->bc_snd_nxt++; |
411 | } | |
412 | ||
27bd9ec0 JM |
413 | bool tipc_group_cong(struct tipc_group *grp, u32 dnode, u32 dport, |
414 | int len, struct tipc_member **mbr) | |
b7d42635 | 415 | { |
27bd9ec0 | 416 | struct sk_buff_head xmitq; |
b7d42635 | 417 | struct tipc_member *m; |
27bd9ec0 JM |
418 | int adv, state; |
419 | ||
420 | m = tipc_group_find_dest(grp, dnode, dport); | |
eb929a91 JM |
421 | if (!tipc_group_is_receiver(m)) { |
422 | *mbr = NULL; | |
27bd9ec0 | 423 | return false; |
eb929a91 JM |
424 | } |
425 | *mbr = m; | |
426 | ||
27bd9ec0 JM |
427 | if (m->window >= len) |
428 | return false; | |
eb929a91 | 429 | |
60c25306 | 430 | *grp->open = false; |
27bd9ec0 JM |
431 | |
432 | /* If not fully advertised, do it now to prevent mutual blocking */ | |
433 | adv = m->advertised; | |
434 | state = m->state; | |
27bd9ec0 JM |
435 | if (state == MBR_JOINED && adv == ADV_IDLE) |
436 | return true; | |
04d7b574 JM |
437 | if (state == MBR_ACTIVE && adv == ADV_ACTIVE) |
438 | return true; | |
439 | if (state == MBR_PENDING && adv == ADV_IDLE) | |
440 | return true; | |
27bd9ec0 JM |
441 | skb_queue_head_init(&xmitq); |
442 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, &xmitq); | |
443 | tipc_node_distr_xmit(grp->net, &xmitq); | |
444 | return true; | |
445 | } | |
446 | ||
447 | bool tipc_group_bc_cong(struct tipc_group *grp, int len) | |
448 | { | |
449 | struct tipc_member *m = NULL; | |
b7d42635 | 450 | |
2f487712 | 451 | /* If prev bcast was replicast, reject until all receivers have acked */ |
eb929a91 | 452 | if (grp->bc_ackers) { |
60c25306 | 453 | *grp->open = false; |
2f487712 | 454 | return true; |
eb929a91 | 455 | } |
38266ca1 | 456 | if (list_empty(&grp->small_win)) |
b7d42635 JM |
457 | return false; |
458 | ||
38266ca1 | 459 | m = list_first_entry(&grp->small_win, struct tipc_member, small_win); |
b7d42635 JM |
460 | if (m->window >= len) |
461 | return false; | |
462 | ||
27bd9ec0 | 463 | return tipc_group_cong(grp, m->node, m->port, len, &m); |
b7d42635 JM |
464 | } |
465 | ||
b87a5ea3 JM |
466 | /* tipc_group_sort_msg() - sort msg into queue by bcast sequence number |
467 | */ | |
468 | static void tipc_group_sort_msg(struct sk_buff *skb, struct sk_buff_head *defq) | |
469 | { | |
470 | struct tipc_msg *_hdr, *hdr = buf_msg(skb); | |
471 | u16 bc_seqno = msg_grp_bc_seqno(hdr); | |
472 | struct sk_buff *_skb, *tmp; | |
473 | int mtyp = msg_type(hdr); | |
474 | ||
a3bada70 | 475 | /* Bcast/mcast may be bypassed by ucast or other bcast, - sort it in */ |
b87a5ea3 JM |
476 | if (mtyp == TIPC_GRP_BCAST_MSG || mtyp == TIPC_GRP_MCAST_MSG) { |
477 | skb_queue_walk_safe(defq, _skb, tmp) { | |
478 | _hdr = buf_msg(_skb); | |
479 | if (!less(bc_seqno, msg_grp_bc_seqno(_hdr))) | |
480 | continue; | |
481 | __skb_queue_before(defq, _skb, skb); | |
482 | return; | |
483 | } | |
484 | /* Bcast was not bypassed, - add to tail */ | |
485 | } | |
486 | /* Unicasts are never bypassed, - always add to tail */ | |
487 | __skb_queue_tail(defq, skb); | |
488 | } | |
489 | ||
75da2163 JM |
490 | /* tipc_group_filter_msg() - determine if we should accept arriving message |
491 | */ | |
492 | void tipc_group_filter_msg(struct tipc_group *grp, struct sk_buff_head *inputq, | |
493 | struct sk_buff_head *xmitq) | |
494 | { | |
495 | struct sk_buff *skb = __skb_dequeue(inputq); | |
a3bada70 | 496 | bool ack, deliver, update, leave = false; |
b87a5ea3 | 497 | struct sk_buff_head *defq; |
75da2163 JM |
498 | struct tipc_member *m; |
499 | struct tipc_msg *hdr; | |
500 | u32 node, port; | |
b87a5ea3 | 501 | int mtyp, blks; |
75da2163 JM |
502 | |
503 | if (!skb) | |
504 | return; | |
505 | ||
506 | hdr = buf_msg(skb); | |
75da2163 JM |
507 | node = msg_orignode(hdr); |
508 | port = msg_origport(hdr); | |
509 | ||
510 | if (!msg_in_group(hdr)) | |
511 | goto drop; | |
512 | ||
513 | m = tipc_group_find_member(grp, node, port); | |
38266ca1 | 514 | if (!tipc_group_is_sender(m)) |
75da2163 JM |
515 | goto drop; |
516 | ||
b87a5ea3 JM |
517 | if (less(msg_grp_bc_seqno(hdr), m->bc_rcv_nxt)) |
518 | goto drop; | |
5b8dddb6 | 519 | |
b87a5ea3 JM |
520 | TIPC_SKB_CB(skb)->orig_member = m->instance; |
521 | defq = &m->deferredq; | |
522 | tipc_group_sort_msg(skb, defq); | |
523 | ||
524 | while ((skb = skb_peek(defq))) { | |
525 | hdr = buf_msg(skb); | |
526 | mtyp = msg_type(hdr); | |
2e724dca | 527 | blks = msg_blocks(hdr); |
b87a5ea3 | 528 | deliver = true; |
2f487712 | 529 | ack = false; |
b87a5ea3 JM |
530 | update = false; |
531 | ||
532 | if (more(msg_grp_bc_seqno(hdr), m->bc_rcv_nxt)) | |
533 | break; | |
534 | ||
535 | /* Decide what to do with message */ | |
536 | switch (mtyp) { | |
537 | case TIPC_GRP_MCAST_MSG: | |
538 | if (msg_nameinst(hdr) != grp->instance) { | |
539 | update = true; | |
540 | deliver = false; | |
541 | } | |
542 | /* Fall thru */ | |
543 | case TIPC_GRP_BCAST_MSG: | |
544 | m->bc_rcv_nxt++; | |
2f487712 | 545 | ack = msg_grp_bc_ack_req(hdr); |
b87a5ea3 JM |
546 | break; |
547 | case TIPC_GRP_UCAST_MSG: | |
548 | break; | |
a3bada70 JM |
549 | case TIPC_GRP_MEMBER_EVT: |
550 | if (m->state == MBR_LEAVING) | |
551 | leave = true; | |
552 | if (!grp->events) | |
553 | deliver = false; | |
554 | break; | |
b87a5ea3 JM |
555 | default: |
556 | break; | |
5b8dddb6 | 557 | } |
5b8dddb6 | 558 | |
b87a5ea3 JM |
559 | /* Execute decisions */ |
560 | __skb_dequeue(defq); | |
561 | if (deliver) | |
562 | __skb_queue_tail(inputq, skb); | |
563 | else | |
564 | kfree_skb(skb); | |
565 | ||
2f487712 JM |
566 | if (ack) |
567 | tipc_group_proto_xmit(grp, m, GRP_ACK_MSG, xmitq); | |
568 | ||
a3bada70 | 569 | if (leave) { |
a3bada70 | 570 | __skb_queue_purge(defq); |
e0e853ac | 571 | tipc_group_delete_member(grp, m); |
a3bada70 JM |
572 | break; |
573 | } | |
b87a5ea3 JM |
574 | if (!update) |
575 | continue; | |
75da2163 | 576 | |
b87a5ea3 JM |
577 | tipc_group_update_rcv_win(grp, blks, node, port, xmitq); |
578 | } | |
75da2163 JM |
579 | return; |
580 | drop: | |
581 | kfree_skb(skb); | |
582 | } | |
583 | ||
b7d42635 JM |
584 | void tipc_group_update_rcv_win(struct tipc_group *grp, int blks, u32 node, |
585 | u32 port, struct sk_buff_head *xmitq) | |
586 | { | |
04d7b574 JM |
587 | struct list_head *active = &grp->active; |
588 | int max_active = grp->max_active; | |
589 | int reclaim_limit = max_active * 3 / 4; | |
590 | int active_cnt = grp->active_cnt; | |
f9c935db | 591 | struct tipc_member *m, *rm, *pm; |
b7d42635 JM |
592 | |
593 | m = tipc_group_find_member(grp, node, port); | |
594 | if (!m) | |
595 | return; | |
596 | ||
597 | m->advertised -= blks; | |
598 | ||
599 | switch (m->state) { | |
600 | case MBR_JOINED: | |
4ea5dab5 JM |
601 | /* First, decide if member can go active */ |
602 | if (active_cnt <= max_active) { | |
603 | m->state = MBR_ACTIVE; | |
604 | list_add_tail(&m->list, active); | |
605 | grp->active_cnt++; | |
606 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq); | |
607 | } else { | |
608 | m->state = MBR_PENDING; | |
609 | list_add_tail(&m->list, &grp->pending); | |
610 | } | |
611 | ||
612 | if (active_cnt < reclaim_limit) | |
613 | break; | |
614 | ||
615 | /* Reclaim from oldest active member, if possible */ | |
616 | if (!list_empty(active)) { | |
04d7b574 JM |
617 | rm = list_first_entry(active, struct tipc_member, list); |
618 | rm->state = MBR_RECLAIMING; | |
8d5dee21 | 619 | list_del_init(&rm->list); |
04d7b574 | 620 | tipc_group_proto_xmit(grp, rm, GRP_RECLAIM_MSG, xmitq); |
04d7b574 JM |
621 | break; |
622 | } | |
4ea5dab5 JM |
623 | /* Nobody to reclaim from; - revert oldest pending to JOINED */ |
624 | pm = list_first_entry(&grp->pending, struct tipc_member, list); | |
625 | list_del_init(&pm->list); | |
626 | pm->state = MBR_JOINED; | |
627 | tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq); | |
628 | break; | |
04d7b574 JM |
629 | case MBR_ACTIVE: |
630 | if (!list_is_last(&m->list, &grp->active)) | |
631 | list_move_tail(&m->list, &grp->active); | |
632 | if (m->advertised > (ADV_ACTIVE * 3 / 4)) | |
633 | break; | |
634 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq); | |
635 | break; | |
636 | case MBR_REMITTED: | |
637 | if (m->advertised > ADV_IDLE) | |
638 | break; | |
639 | m->state = MBR_JOINED; | |
8d5dee21 | 640 | grp->active_cnt--; |
04d7b574 JM |
641 | if (m->advertised < ADV_IDLE) { |
642 | pr_warn_ratelimited("Rcv unexpected msg after REMIT\n"); | |
b7d42635 | 643 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq); |
04d7b574 | 644 | } |
8d5dee21 | 645 | |
f9c935db JM |
646 | if (list_empty(&grp->pending)) |
647 | return; | |
648 | ||
649 | /* Set oldest pending member to active and advertise */ | |
650 | pm = list_first_entry(&grp->pending, struct tipc_member, list); | |
651 | pm->state = MBR_ACTIVE; | |
652 | list_move_tail(&pm->list, &grp->active); | |
653 | grp->active_cnt++; | |
654 | tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq); | |
b7d42635 | 655 | break; |
04d7b574 | 656 | case MBR_RECLAIMING: |
b7d42635 JM |
657 | case MBR_JOINING: |
658 | case MBR_LEAVING: | |
659 | default: | |
660 | break; | |
661 | } | |
662 | } | |
663 | ||
7ad32bcb JM |
664 | static void tipc_group_create_event(struct tipc_group *grp, |
665 | struct tipc_member *m, | |
666 | u32 event, u16 seqno, | |
667 | struct sk_buff_head *inputq) | |
668 | { u32 dnode = tipc_own_addr(grp->net); | |
669 | struct tipc_event evt; | |
670 | struct sk_buff *skb; | |
671 | struct tipc_msg *hdr; | |
672 | ||
673 | evt.event = event; | |
674 | evt.found_lower = m->instance; | |
675 | evt.found_upper = m->instance; | |
676 | evt.port.ref = m->port; | |
677 | evt.port.node = m->node; | |
678 | evt.s.seq.type = grp->type; | |
679 | evt.s.seq.lower = m->instance; | |
680 | evt.s.seq.upper = m->instance; | |
681 | ||
682 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_GRP_MEMBER_EVT, | |
683 | GROUP_H_SIZE, sizeof(evt), dnode, m->node, | |
684 | grp->portid, m->port, 0); | |
685 | if (!skb) | |
686 | return; | |
687 | ||
688 | hdr = buf_msg(skb); | |
689 | msg_set_nametype(hdr, grp->type); | |
690 | msg_set_grp_evt(hdr, event); | |
691 | msg_set_dest_droppable(hdr, true); | |
692 | msg_set_grp_bc_seqno(hdr, seqno); | |
693 | memcpy(msg_data(hdr), &evt, sizeof(evt)); | |
694 | TIPC_SKB_CB(skb)->orig_member = m->instance; | |
695 | __skb_queue_tail(inputq, skb); | |
696 | } | |
697 | ||
75da2163 JM |
698 | static void tipc_group_proto_xmit(struct tipc_group *grp, struct tipc_member *m, |
699 | int mtyp, struct sk_buff_head *xmitq) | |
700 | { | |
701 | struct tipc_msg *hdr; | |
702 | struct sk_buff *skb; | |
b7d42635 | 703 | int adv = 0; |
75da2163 JM |
704 | |
705 | skb = tipc_msg_create(GROUP_PROTOCOL, mtyp, INT_H_SIZE, 0, | |
706 | m->node, tipc_own_addr(grp->net), | |
707 | m->port, grp->portid, 0); | |
708 | if (!skb) | |
709 | return; | |
710 | ||
04d7b574 | 711 | if (m->state == MBR_ACTIVE) |
b7d42635 | 712 | adv = ADV_ACTIVE - m->advertised; |
04d7b574 JM |
713 | else if (m->state == MBR_JOINED || m->state == MBR_PENDING) |
714 | adv = ADV_IDLE - m->advertised; | |
b7d42635 | 715 | |
75da2163 | 716 | hdr = buf_msg(skb); |
b7d42635 JM |
717 | |
718 | if (mtyp == GRP_JOIN_MSG) { | |
75da2163 | 719 | msg_set_grp_bc_syncpt(hdr, grp->bc_snd_nxt); |
b7d42635 JM |
720 | msg_set_adv_win(hdr, adv); |
721 | m->advertised += adv; | |
a3bada70 JM |
722 | } else if (mtyp == GRP_LEAVE_MSG) { |
723 | msg_set_grp_bc_syncpt(hdr, grp->bc_snd_nxt); | |
b7d42635 JM |
724 | } else if (mtyp == GRP_ADV_MSG) { |
725 | msg_set_adv_win(hdr, adv); | |
726 | m->advertised += adv; | |
2f487712 JM |
727 | } else if (mtyp == GRP_ACK_MSG) { |
728 | msg_set_grp_bc_acked(hdr, m->bc_rcv_nxt); | |
04d7b574 JM |
729 | } else if (mtyp == GRP_REMIT_MSG) { |
730 | msg_set_grp_remitted(hdr, m->window); | |
b7d42635 | 731 | } |
23483399 | 732 | msg_set_dest_droppable(hdr, true); |
75da2163 JM |
733 | __skb_queue_tail(xmitq, skb); |
734 | } | |
735 | ||
b7d42635 JM |
736 | void tipc_group_proto_rcv(struct tipc_group *grp, bool *usr_wakeup, |
737 | struct tipc_msg *hdr, struct sk_buff_head *inputq, | |
75da2163 JM |
738 | struct sk_buff_head *xmitq) |
739 | { | |
740 | u32 node = msg_orignode(hdr); | |
741 | u32 port = msg_origport(hdr); | |
04d7b574 | 742 | struct tipc_member *m, *pm; |
04d7b574 | 743 | u16 remitted, in_flight; |
75da2163 JM |
744 | |
745 | if (!grp) | |
746 | return; | |
747 | ||
232d07b7 JM |
748 | if (grp->scope == TIPC_NODE_SCOPE && node != tipc_own_addr(grp->net)) |
749 | return; | |
750 | ||
75da2163 JM |
751 | m = tipc_group_find_member(grp, node, port); |
752 | ||
753 | switch (msg_type(hdr)) { | |
754 | case GRP_JOIN_MSG: | |
755 | if (!m) | |
756 | m = tipc_group_create_member(grp, node, port, | |
d12d2e12 | 757 | 0, MBR_JOINING); |
75da2163 JM |
758 | if (!m) |
759 | return; | |
a3bada70 JM |
760 | m->bc_syncpt = msg_grp_bc_syncpt(hdr); |
761 | m->bc_rcv_nxt = m->bc_syncpt; | |
b7d42635 | 762 | m->window += msg_adv_win(hdr); |
75da2163 | 763 | |
d12d2e12 JM |
764 | /* Wait until PUBLISH event is received if necessary */ |
765 | if (m->state != MBR_PUBLISHED) | |
766 | return; | |
767 | ||
768 | /* Member can be taken into service */ | |
769 | m->state = MBR_JOINED; | |
eb929a91 | 770 | tipc_group_open(m, usr_wakeup); |
bb25c385 | 771 | tipc_group_update_member(m, 0); |
d12d2e12 JM |
772 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq); |
773 | tipc_group_create_event(grp, m, TIPC_PUBLISHED, | |
774 | m->bc_syncpt, inputq); | |
75da2163 JM |
775 | return; |
776 | case GRP_LEAVE_MSG: | |
777 | if (!m) | |
778 | return; | |
a3bada70 | 779 | m->bc_syncpt = msg_grp_bc_syncpt(hdr); |
3f42f5fe | 780 | list_del_init(&m->list); |
eb929a91 | 781 | tipc_group_open(m, usr_wakeup); |
c2b22bcf JM |
782 | tipc_group_decr_active(grp, m); |
783 | m->state = MBR_LEAVING; | |
7ad32bcb JM |
784 | tipc_group_create_event(grp, m, TIPC_WITHDRAWN, |
785 | m->bc_syncpt, inputq); | |
b7d42635 JM |
786 | return; |
787 | case GRP_ADV_MSG: | |
788 | if (!m) | |
789 | return; | |
790 | m->window += msg_adv_win(hdr); | |
eb929a91 | 791 | tipc_group_open(m, usr_wakeup); |
75da2163 | 792 | return; |
2f487712 JM |
793 | case GRP_ACK_MSG: |
794 | if (!m) | |
795 | return; | |
796 | m->bc_acked = msg_grp_bc_acked(hdr); | |
797 | if (--grp->bc_ackers) | |
eb929a91 JM |
798 | return; |
799 | list_del_init(&m->small_win); | |
60c25306 | 800 | *m->group->open = true; |
2f487712 | 801 | *usr_wakeup = true; |
eb929a91 | 802 | tipc_group_update_member(m, 0); |
2f487712 | 803 | return; |
04d7b574 JM |
804 | case GRP_RECLAIM_MSG: |
805 | if (!m) | |
806 | return; | |
04d7b574 JM |
807 | tipc_group_proto_xmit(grp, m, GRP_REMIT_MSG, xmitq); |
808 | m->window = ADV_IDLE; | |
eb929a91 | 809 | tipc_group_open(m, usr_wakeup); |
04d7b574 JM |
810 | return; |
811 | case GRP_REMIT_MSG: | |
812 | if (!m || m->state != MBR_RECLAIMING) | |
813 | return; | |
814 | ||
04d7b574 JM |
815 | remitted = msg_grp_remitted(hdr); |
816 | ||
817 | /* Messages preceding the REMIT still in receive queue */ | |
818 | if (m->advertised > remitted) { | |
819 | m->state = MBR_REMITTED; | |
820 | in_flight = m->advertised - remitted; | |
f9c935db JM |
821 | m->advertised = ADV_IDLE + in_flight; |
822 | return; | |
04d7b574 | 823 | } |
8d5dee21 | 824 | /* This should never happen */ |
04d7b574 | 825 | if (m->advertised < remitted) |
8d5dee21 | 826 | pr_warn_ratelimited("Unexpected REMIT msg\n"); |
04d7b574 | 827 | |
8d5dee21 JM |
828 | /* All messages preceding the REMIT have been read */ |
829 | m->state = MBR_JOINED; | |
f9c935db | 830 | grp->active_cnt--; |
8d5dee21 | 831 | m->advertised = ADV_IDLE; |
04d7b574 JM |
832 | |
833 | /* Set oldest pending member to active and advertise */ | |
834 | if (list_empty(&grp->pending)) | |
835 | return; | |
836 | pm = list_first_entry(&grp->pending, struct tipc_member, list); | |
837 | pm->state = MBR_ACTIVE; | |
838 | list_move_tail(&pm->list, &grp->active); | |
839 | grp->active_cnt++; | |
840 | if (pm->advertised <= (ADV_ACTIVE * 3 / 4)) | |
841 | tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq); | |
842 | return; | |
75da2163 JM |
843 | default: |
844 | pr_warn("Received unknown GROUP_PROTO message\n"); | |
845 | } | |
846 | } | |
847 | ||
b7d42635 JM |
848 | /* tipc_group_member_evt() - receive and handle a member up/down event |
849 | */ | |
75da2163 | 850 | void tipc_group_member_evt(struct tipc_group *grp, |
b7d42635 JM |
851 | bool *usr_wakeup, |
852 | int *sk_rcvbuf, | |
7ad32bcb | 853 | struct tipc_msg *hdr, |
ae236fb2 | 854 | struct sk_buff_head *inputq, |
75da2163 JM |
855 | struct sk_buff_head *xmitq) |
856 | { | |
75da2163 | 857 | struct tipc_event *evt = (void *)msg_data(hdr); |
ae236fb2 | 858 | u32 instance = evt->found_lower; |
75da2163 JM |
859 | u32 node = evt->port.node; |
860 | u32 port = evt->port.ref; | |
ae236fb2 | 861 | int event = evt->event; |
75da2163 JM |
862 | struct tipc_member *m; |
863 | struct net *net; | |
864 | u32 self; | |
865 | ||
866 | if (!grp) | |
7ad32bcb | 867 | return; |
75da2163 JM |
868 | |
869 | net = grp->net; | |
870 | self = tipc_own_addr(net); | |
871 | if (!grp->loopback && node == self && port == grp->portid) | |
7ad32bcb | 872 | return; |
ae236fb2 | 873 | |
75da2163 JM |
874 | m = tipc_group_find_member(grp, node, port); |
875 | ||
d12d2e12 JM |
876 | switch (event) { |
877 | case TIPC_PUBLISHED: | |
878 | /* Send and wait for arrival of JOIN message if necessary */ | |
879 | if (!m) { | |
880 | m = tipc_group_create_member(grp, node, port, instance, | |
881 | MBR_PUBLISHED); | |
882 | if (!m) | |
883 | break; | |
884 | tipc_group_update_member(m, 0); | |
885 | tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq); | |
886 | break; | |
887 | } | |
7ad32bcb | 888 | |
d12d2e12 JM |
889 | if (m->state != MBR_JOINING) |
890 | break; | |
75da2163 | 891 | |
d12d2e12 JM |
892 | /* Member can be taken into service */ |
893 | m->instance = instance; | |
894 | m->state = MBR_JOINED; | |
eb929a91 | 895 | tipc_group_open(m, usr_wakeup); |
d84d1b3b | 896 | tipc_group_update_member(m, 0); |
d12d2e12 JM |
897 | tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq); |
898 | tipc_group_create_event(grp, m, TIPC_PUBLISHED, | |
899 | m->bc_syncpt, inputq); | |
900 | break; | |
901 | case TIPC_WITHDRAWN: | |
75da2163 | 902 | if (!m) |
d12d2e12 | 903 | break; |
ae236fb2 | 904 | |
c2b22bcf JM |
905 | tipc_group_decr_active(grp, m); |
906 | m->state = MBR_LEAVING; | |
3f42f5fe | 907 | list_del_init(&m->list); |
eb929a91 | 908 | tipc_group_open(m, usr_wakeup); |
c2b22bcf JM |
909 | |
910 | /* Only send event if no LEAVE message can be expected */ | |
911 | if (!tipc_node_is_up(net, node)) | |
912 | tipc_group_create_event(grp, m, TIPC_WITHDRAWN, | |
913 | m->bc_rcv_nxt, inputq); | |
d12d2e12 JM |
914 | break; |
915 | default: | |
916 | break; | |
75da2163 | 917 | } |
b7d42635 | 918 | *sk_rcvbuf = tipc_group_rcvbuf_limit(grp); |
75da2163 | 919 | } |