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