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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; |
b7d42635 | 77 | bool usr_pending; |
75da2163 JM |
78 | }; |
79 | ||
80 | struct tipc_group { | |
81 | struct rb_root members; | |
38266ca1 | 82 | struct list_head small_win; |
04d7b574 JM |
83 | struct list_head pending; |
84 | struct list_head active; | |
75da2163 JM |
85 | struct tipc_nlist dests; |
86 | struct net *net; | |
87 | int subid; | |
88 | u32 type; | |
89 | u32 instance; | |
90 | u32 domain; | |
91 | u32 scope; | |
92 | u32 portid; | |
93 | u16 member_cnt; | |
04d7b574 JM |
94 | u16 active_cnt; |
95 | u16 max_active; | |
75da2163 | 96 | u16 bc_snd_nxt; |
2f487712 | 97 | u16 bc_ackers; |
75da2163 | 98 | bool loopback; |
ae236fb2 | 99 | bool events; |
75da2163 JM |
100 | }; |
101 | ||
102 | static void tipc_group_proto_xmit(struct tipc_group *grp, struct tipc_member *m, | |
103 | int mtyp, struct sk_buff_head *xmitq); | |
104 | ||
04d7b574 JM |
105 | static void tipc_group_decr_active(struct tipc_group *grp, |
106 | struct tipc_member *m) | |
107 | { | |
f9c935db JM |
108 | if (m->state == MBR_ACTIVE || m->state == MBR_RECLAIMING || |
109 | m->state == MBR_REMITTED) | |
04d7b574 JM |
110 | grp->active_cnt--; |
111 | } | |
112 | ||
b7d42635 JM |
113 | static int tipc_group_rcvbuf_limit(struct tipc_group *grp) |
114 | { | |
04d7b574 | 115 | int max_active, active_pool, idle_pool; |
b7d42635 JM |
116 | int mcnt = grp->member_cnt + 1; |
117 | ||
04d7b574 JM |
118 | /* Limit simultaneous reception from other members */ |
119 | max_active = min(mcnt / 8, 64); | |
120 | max_active = max(max_active, 16); | |
121 | grp->max_active = max_active; | |
122 | ||
123 | /* Reserve blocks for active and idle members */ | |
124 | active_pool = max_active * ADV_ACTIVE; | |
125 | idle_pool = (mcnt - max_active) * ADV_IDLE; | |
126 | ||
b7d42635 | 127 | /* Scale to bytes, considering worst-case truesize/msgsize ratio */ |
04d7b574 | 128 | return (active_pool + idle_pool) * FLOWCTL_BLK_SZ * 4; |
b7d42635 JM |
129 | } |
130 | ||
75da2163 JM |
131 | u16 tipc_group_bc_snd_nxt(struct tipc_group *grp) |
132 | { | |
133 | return grp->bc_snd_nxt; | |
134 | } | |
135 | ||
38266ca1 | 136 | static bool tipc_group_is_receiver(struct tipc_member *m) |
b7d42635 | 137 | { |
0233493a | 138 | return m && m->state != MBR_JOINING && m->state != MBR_LEAVING; |
b7d42635 JM |
139 | } |
140 | ||
38266ca1 | 141 | static bool tipc_group_is_sender(struct tipc_member *m) |
75da2163 | 142 | { |
d12d2e12 | 143 | return m && m->state != MBR_JOINING && m->state != MBR_PUBLISHED; |
75da2163 JM |
144 | } |
145 | ||
ee106d7f JM |
146 | u32 tipc_group_exclude(struct tipc_group *grp) |
147 | { | |
148 | if (!grp->loopback) | |
149 | return grp->portid; | |
150 | return 0; | |
151 | } | |
152 | ||
75da2163 JM |
153 | int tipc_group_size(struct tipc_group *grp) |
154 | { | |
155 | return grp->member_cnt; | |
156 | } | |
157 | ||
158 | struct tipc_group *tipc_group_create(struct net *net, u32 portid, | |
159 | struct tipc_group_req *mreq) | |
160 | { | |
161 | struct tipc_group *grp; | |
162 | u32 type = mreq->type; | |
163 | ||
164 | grp = kzalloc(sizeof(*grp), GFP_ATOMIC); | |
165 | if (!grp) | |
166 | return NULL; | |
167 | tipc_nlist_init(&grp->dests, tipc_own_addr(net)); | |
38266ca1 | 168 | INIT_LIST_HEAD(&grp->small_win); |
04d7b574 JM |
169 | INIT_LIST_HEAD(&grp->active); |
170 | INIT_LIST_HEAD(&grp->pending); | |
75da2163 JM |
171 | grp->members = RB_ROOT; |
172 | grp->net = net; | |
173 | grp->portid = portid; | |
174 | grp->domain = addr_domain(net, mreq->scope); | |
175 | grp->type = type; | |
176 | grp->instance = mreq->instance; | |
177 | grp->scope = mreq->scope; | |
178 | grp->loopback = mreq->flags & TIPC_GROUP_LOOPBACK; | |
ae236fb2 | 179 | grp->events = mreq->flags & TIPC_GROUP_MEMBER_EVTS; |
8348500f JM |
180 | if (tipc_topsrv_kern_subscr(net, portid, type, |
181 | TIPC_SUB_PORTS | TIPC_SUB_NO_STATUS, | |
182 | 0, ~0, &grp->subid)) | |
75da2163 JM |
183 | return grp; |
184 | kfree(grp); | |
185 | return NULL; | |
186 | } | |
187 | ||
d12d2e12 JM |
188 | void tipc_group_join(struct net *net, struct tipc_group *grp, int *sk_rcvbuf) |
189 | { | |
190 | struct rb_root *tree = &grp->members; | |
191 | struct tipc_member *m, *tmp; | |
192 | struct sk_buff_head xmitq; | |
193 | ||
194 | skb_queue_head_init(&xmitq); | |
195 | rbtree_postorder_for_each_entry_safe(m, tmp, tree, tree_node) { | |
196 | tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, &xmitq); | |
197 | tipc_group_update_member(m, 0); | |
198 | } | |
199 | tipc_node_distr_xmit(net, &xmitq); | |
200 | *sk_rcvbuf = tipc_group_rcvbuf_limit(grp); | |
201 | } | |
202 | ||
75da2163 JM |
203 | void tipc_group_delete(struct net *net, struct tipc_group *grp) |
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 | ||
211 | rbtree_postorder_for_each_entry_safe(m, tmp, tree, tree_node) { | |
212 | tipc_group_proto_xmit(grp, m, GRP_LEAVE_MSG, &xmitq); | |
213 | list_del(&m->list); | |
214 | kfree(m); | |
215 | } | |
216 | tipc_node_distr_xmit(net, &xmitq); | |
217 | tipc_nlist_purge(&grp->dests); | |
218 | tipc_topsrv_kern_unsubscr(net, grp->subid); | |
219 | kfree(grp); | |
220 | } | |
221 | ||
222 | struct tipc_member *tipc_group_find_member(struct tipc_group *grp, | |
223 | u32 node, u32 port) | |
224 | { | |
225 | struct rb_node *n = grp->members.rb_node; | |
226 | u64 nkey, key = (u64)node << 32 | port; | |
227 | struct tipc_member *m; | |
228 | ||
229 | while (n) { | |
230 | m = container_of(n, struct tipc_member, tree_node); | |
231 | nkey = (u64)m->node << 32 | m->port; | |
232 | if (key < nkey) | |
233 | n = n->rb_left; | |
234 | else if (key > nkey) | |
235 | n = n->rb_right; | |
236 | else | |
237 | return m; | |
238 | } | |
239 | return NULL; | |
240 | } | |
241 | ||
27bd9ec0 JM |
242 | static struct tipc_member *tipc_group_find_dest(struct tipc_group *grp, |
243 | u32 node, u32 port) | |
244 | { | |
245 | struct tipc_member *m; | |
246 | ||
247 | m = tipc_group_find_member(grp, node, port); | |
38266ca1 | 248 | if (m && tipc_group_is_receiver(m)) |
27bd9ec0 JM |
249 | return m; |
250 | return NULL; | |
251 | } | |
252 | ||
75da2163 JM |
253 | static struct tipc_member *tipc_group_find_node(struct tipc_group *grp, |
254 | u32 node) | |
255 | { | |
256 | struct tipc_member *m; | |
257 | struct rb_node *n; | |
258 | ||
259 | for (n = rb_first(&grp->members); n; n = rb_next(n)) { | |
260 | m = container_of(n, struct tipc_member, tree_node); | |
261 | if (m->node == node) | |
262 | return m; | |
263 | } | |
264 | return NULL; | |
265 | } | |
266 | ||
267 | static void tipc_group_add_to_tree(struct tipc_group *grp, | |
268 | struct tipc_member *m) | |
269 | { | |
270 | u64 nkey, key = (u64)m->node << 32 | m->port; | |
271 | struct rb_node **n, *parent = NULL; | |
272 | struct tipc_member *tmp; | |
273 | ||
274 | n = &grp->members.rb_node; | |
275 | while (*n) { | |
276 | tmp = container_of(*n, struct tipc_member, tree_node); | |
277 | parent = *n; | |
278 | tmp = container_of(parent, struct tipc_member, tree_node); | |
279 | nkey = (u64)tmp->node << 32 | tmp->port; | |
280 | if (key < nkey) | |
281 | n = &(*n)->rb_left; | |
282 | else if (key > nkey) | |
283 | n = &(*n)->rb_right; | |
284 | else | |
285 | return; | |
286 | } | |
287 | rb_link_node(&m->tree_node, parent, n); | |
288 | rb_insert_color(&m->tree_node, &grp->members); | |
289 | } | |
290 | ||
291 | static struct tipc_member *tipc_group_create_member(struct tipc_group *grp, | |
292 | u32 node, u32 port, | |
d12d2e12 | 293 | u32 instance, int state) |
75da2163 JM |
294 | { |
295 | struct tipc_member *m; | |
296 | ||
297 | m = kzalloc(sizeof(*m), GFP_ATOMIC); | |
298 | if (!m) | |
299 | return NULL; | |
300 | INIT_LIST_HEAD(&m->list); | |
38266ca1 | 301 | INIT_LIST_HEAD(&m->small_win); |
b87a5ea3 | 302 | __skb_queue_head_init(&m->deferredq); |
b7d42635 | 303 | m->group = grp; |
75da2163 JM |
304 | m->node = node; |
305 | m->port = port; | |
d12d2e12 | 306 | m->instance = instance; |
2f487712 | 307 | m->bc_acked = grp->bc_snd_nxt - 1; |
75da2163 JM |
308 | grp->member_cnt++; |
309 | tipc_group_add_to_tree(grp, m); | |
310 | tipc_nlist_add(&grp->dests, m->node); | |
311 | m->state = state; | |
312 | return m; | |
313 | } | |
314 | ||
d12d2e12 JM |
315 | void tipc_group_add_member(struct tipc_group *grp, u32 node, |
316 | u32 port, u32 instance) | |
75da2163 | 317 | { |
d12d2e12 | 318 | tipc_group_create_member(grp, node, port, instance, MBR_PUBLISHED); |
75da2163 JM |
319 | } |
320 | ||
321 | static void tipc_group_delete_member(struct tipc_group *grp, | |
322 | struct tipc_member *m) | |
323 | { | |
324 | rb_erase(&m->tree_node, &grp->members); | |
325 | grp->member_cnt--; | |
2f487712 JM |
326 | |
327 | /* Check if we were waiting for replicast ack from this member */ | |
328 | if (grp->bc_ackers && less(m->bc_acked, grp->bc_snd_nxt - 1)) | |
329 | grp->bc_ackers--; | |
330 | ||
75da2163 | 331 | list_del_init(&m->list); |
38266ca1 | 332 | list_del_init(&m->small_win); |
04d7b574 | 333 | tipc_group_decr_active(grp, m); |
75da2163 JM |
334 | |
335 | /* If last member on a node, remove node from dest list */ | |
336 | if (!tipc_group_find_node(grp, m->node)) | |
337 | tipc_nlist_del(&grp->dests, m->node); | |
338 | ||
339 | kfree(m); | |
340 | } | |
341 | ||
342 | struct tipc_nlist *tipc_group_dests(struct tipc_group *grp) | |
343 | { | |
344 | return &grp->dests; | |
345 | } | |
346 | ||
347 | void tipc_group_self(struct tipc_group *grp, struct tipc_name_seq *seq, | |
348 | int *scope) | |
349 | { | |
350 | seq->type = grp->type; | |
351 | seq->lower = grp->instance; | |
352 | seq->upper = grp->instance; | |
353 | *scope = grp->scope; | |
354 | } | |
355 | ||
b7d42635 JM |
356 | void tipc_group_update_member(struct tipc_member *m, int len) |
357 | { | |
358 | struct tipc_group *grp = m->group; | |
359 | struct tipc_member *_m, *tmp; | |
360 | ||
38266ca1 | 361 | if (!tipc_group_is_receiver(m)) |
b7d42635 JM |
362 | return; |
363 | ||
364 | m->window -= len; | |
365 | ||
366 | if (m->window >= ADV_IDLE) | |
367 | return; | |
368 | ||
38266ca1 | 369 | list_del_init(&m->small_win); |
b7d42635 | 370 | |
38266ca1 JM |
371 | /* Sort member into small_window members' list */ |
372 | list_for_each_entry_safe(_m, tmp, &grp->small_win, small_win) { | |
d84d1b3b JM |
373 | if (_m->window > m->window) |
374 | break; | |
b7d42635 | 375 | } |
d84d1b3b | 376 | list_add_tail(&m->small_win, &_m->small_win); |
b7d42635 JM |
377 | } |
378 | ||
2f487712 | 379 | void tipc_group_update_bc_members(struct tipc_group *grp, int len, bool ack) |
75da2163 | 380 | { |
2f487712 | 381 | u16 prev = grp->bc_snd_nxt - 1; |
b7d42635 JM |
382 | struct tipc_member *m; |
383 | struct rb_node *n; | |
0a3d805c | 384 | u16 ackers = 0; |
b7d42635 JM |
385 | |
386 | for (n = rb_first(&grp->members); n; n = rb_next(n)) { | |
387 | m = container_of(n, struct tipc_member, tree_node); | |
38266ca1 | 388 | if (tipc_group_is_receiver(m)) { |
b7d42635 | 389 | tipc_group_update_member(m, len); |
2f487712 | 390 | m->bc_acked = prev; |
0a3d805c | 391 | ackers++; |
2f487712 | 392 | } |
b7d42635 | 393 | } |
2f487712 JM |
394 | |
395 | /* Mark number of acknowledges to expect, if any */ | |
396 | if (ack) | |
0a3d805c | 397 | grp->bc_ackers = ackers; |
75da2163 JM |
398 | grp->bc_snd_nxt++; |
399 | } | |
400 | ||
27bd9ec0 JM |
401 | bool tipc_group_cong(struct tipc_group *grp, u32 dnode, u32 dport, |
402 | int len, struct tipc_member **mbr) | |
b7d42635 | 403 | { |
27bd9ec0 | 404 | struct sk_buff_head xmitq; |
b7d42635 | 405 | struct tipc_member *m; |
27bd9ec0 JM |
406 | int adv, state; |
407 | ||
408 | m = tipc_group_find_dest(grp, dnode, dport); | |
409 | *mbr = m; | |
410 | if (!m) | |
411 | return false; | |
412 | if (m->usr_pending) | |
413 | return true; | |
414 | if (m->window >= len) | |
415 | return false; | |
416 | m->usr_pending = true; | |
417 | ||
418 | /* If not fully advertised, do it now to prevent mutual blocking */ | |
419 | adv = m->advertised; | |
420 | state = m->state; | |
421 | if (state < MBR_JOINED) | |
422 | return true; | |
423 | if (state == MBR_JOINED && adv == ADV_IDLE) | |
424 | return true; | |
04d7b574 JM |
425 | if (state == MBR_ACTIVE && adv == ADV_ACTIVE) |
426 | return true; | |
427 | if (state == MBR_PENDING && adv == ADV_IDLE) | |
428 | return true; | |
27bd9ec0 JM |
429 | skb_queue_head_init(&xmitq); |
430 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, &xmitq); | |
431 | tipc_node_distr_xmit(grp->net, &xmitq); | |
432 | return true; | |
433 | } | |
434 | ||
435 | bool tipc_group_bc_cong(struct tipc_group *grp, int len) | |
436 | { | |
437 | struct tipc_member *m = NULL; | |
b7d42635 | 438 | |
2f487712 JM |
439 | /* If prev bcast was replicast, reject until all receivers have acked */ |
440 | if (grp->bc_ackers) | |
441 | return true; | |
442 | ||
38266ca1 | 443 | if (list_empty(&grp->small_win)) |
b7d42635 JM |
444 | return false; |
445 | ||
38266ca1 | 446 | m = list_first_entry(&grp->small_win, struct tipc_member, small_win); |
b7d42635 JM |
447 | if (m->window >= len) |
448 | return false; | |
449 | ||
27bd9ec0 | 450 | return tipc_group_cong(grp, m->node, m->port, len, &m); |
b7d42635 JM |
451 | } |
452 | ||
b87a5ea3 JM |
453 | /* tipc_group_sort_msg() - sort msg into queue by bcast sequence number |
454 | */ | |
455 | static void tipc_group_sort_msg(struct sk_buff *skb, struct sk_buff_head *defq) | |
456 | { | |
457 | struct tipc_msg *_hdr, *hdr = buf_msg(skb); | |
458 | u16 bc_seqno = msg_grp_bc_seqno(hdr); | |
459 | struct sk_buff *_skb, *tmp; | |
460 | int mtyp = msg_type(hdr); | |
461 | ||
a3bada70 | 462 | /* Bcast/mcast may be bypassed by ucast or other bcast, - sort it in */ |
b87a5ea3 JM |
463 | if (mtyp == TIPC_GRP_BCAST_MSG || mtyp == TIPC_GRP_MCAST_MSG) { |
464 | skb_queue_walk_safe(defq, _skb, tmp) { | |
465 | _hdr = buf_msg(_skb); | |
466 | if (!less(bc_seqno, msg_grp_bc_seqno(_hdr))) | |
467 | continue; | |
468 | __skb_queue_before(defq, _skb, skb); | |
469 | return; | |
470 | } | |
471 | /* Bcast was not bypassed, - add to tail */ | |
472 | } | |
473 | /* Unicasts are never bypassed, - always add to tail */ | |
474 | __skb_queue_tail(defq, skb); | |
475 | } | |
476 | ||
75da2163 JM |
477 | /* tipc_group_filter_msg() - determine if we should accept arriving message |
478 | */ | |
479 | void tipc_group_filter_msg(struct tipc_group *grp, struct sk_buff_head *inputq, | |
480 | struct sk_buff_head *xmitq) | |
481 | { | |
482 | struct sk_buff *skb = __skb_dequeue(inputq); | |
a3bada70 | 483 | bool ack, deliver, update, leave = false; |
b87a5ea3 | 484 | struct sk_buff_head *defq; |
75da2163 JM |
485 | struct tipc_member *m; |
486 | struct tipc_msg *hdr; | |
487 | u32 node, port; | |
b87a5ea3 | 488 | int mtyp, blks; |
75da2163 JM |
489 | |
490 | if (!skb) | |
491 | return; | |
492 | ||
493 | hdr = buf_msg(skb); | |
75da2163 JM |
494 | node = msg_orignode(hdr); |
495 | port = msg_origport(hdr); | |
496 | ||
497 | if (!msg_in_group(hdr)) | |
498 | goto drop; | |
499 | ||
500 | m = tipc_group_find_member(grp, node, port); | |
38266ca1 | 501 | if (!tipc_group_is_sender(m)) |
75da2163 JM |
502 | goto drop; |
503 | ||
b87a5ea3 JM |
504 | if (less(msg_grp_bc_seqno(hdr), m->bc_rcv_nxt)) |
505 | goto drop; | |
5b8dddb6 | 506 | |
b87a5ea3 JM |
507 | TIPC_SKB_CB(skb)->orig_member = m->instance; |
508 | defq = &m->deferredq; | |
509 | tipc_group_sort_msg(skb, defq); | |
510 | ||
511 | while ((skb = skb_peek(defq))) { | |
512 | hdr = buf_msg(skb); | |
513 | mtyp = msg_type(hdr); | |
2e724dca | 514 | blks = msg_blocks(hdr); |
b87a5ea3 | 515 | deliver = true; |
2f487712 | 516 | ack = false; |
b87a5ea3 JM |
517 | update = false; |
518 | ||
519 | if (more(msg_grp_bc_seqno(hdr), m->bc_rcv_nxt)) | |
520 | break; | |
521 | ||
522 | /* Decide what to do with message */ | |
523 | switch (mtyp) { | |
524 | case TIPC_GRP_MCAST_MSG: | |
525 | if (msg_nameinst(hdr) != grp->instance) { | |
526 | update = true; | |
527 | deliver = false; | |
528 | } | |
529 | /* Fall thru */ | |
530 | case TIPC_GRP_BCAST_MSG: | |
531 | m->bc_rcv_nxt++; | |
2f487712 | 532 | ack = msg_grp_bc_ack_req(hdr); |
b87a5ea3 JM |
533 | break; |
534 | case TIPC_GRP_UCAST_MSG: | |
535 | break; | |
a3bada70 JM |
536 | case TIPC_GRP_MEMBER_EVT: |
537 | if (m->state == MBR_LEAVING) | |
538 | leave = true; | |
539 | if (!grp->events) | |
540 | deliver = false; | |
541 | break; | |
b87a5ea3 JM |
542 | default: |
543 | break; | |
5b8dddb6 | 544 | } |
5b8dddb6 | 545 | |
b87a5ea3 JM |
546 | /* Execute decisions */ |
547 | __skb_dequeue(defq); | |
548 | if (deliver) | |
549 | __skb_queue_tail(inputq, skb); | |
550 | else | |
551 | kfree_skb(skb); | |
552 | ||
2f487712 JM |
553 | if (ack) |
554 | tipc_group_proto_xmit(grp, m, GRP_ACK_MSG, xmitq); | |
555 | ||
a3bada70 | 556 | if (leave) { |
a3bada70 | 557 | __skb_queue_purge(defq); |
e0e853ac | 558 | tipc_group_delete_member(grp, m); |
a3bada70 JM |
559 | break; |
560 | } | |
b87a5ea3 JM |
561 | if (!update) |
562 | continue; | |
75da2163 | 563 | |
b87a5ea3 JM |
564 | tipc_group_update_rcv_win(grp, blks, node, port, xmitq); |
565 | } | |
75da2163 JM |
566 | return; |
567 | drop: | |
568 | kfree_skb(skb); | |
569 | } | |
570 | ||
b7d42635 JM |
571 | void tipc_group_update_rcv_win(struct tipc_group *grp, int blks, u32 node, |
572 | u32 port, struct sk_buff_head *xmitq) | |
573 | { | |
04d7b574 JM |
574 | struct list_head *active = &grp->active; |
575 | int max_active = grp->max_active; | |
576 | int reclaim_limit = max_active * 3 / 4; | |
577 | int active_cnt = grp->active_cnt; | |
f9c935db | 578 | struct tipc_member *m, *rm, *pm; |
b7d42635 JM |
579 | |
580 | m = tipc_group_find_member(grp, node, port); | |
581 | if (!m) | |
582 | return; | |
583 | ||
584 | m->advertised -= blks; | |
585 | ||
586 | switch (m->state) { | |
587 | case MBR_JOINED: | |
4ea5dab5 JM |
588 | /* First, decide if member can go active */ |
589 | if (active_cnt <= max_active) { | |
590 | m->state = MBR_ACTIVE; | |
591 | list_add_tail(&m->list, active); | |
592 | grp->active_cnt++; | |
593 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq); | |
594 | } else { | |
595 | m->state = MBR_PENDING; | |
596 | list_add_tail(&m->list, &grp->pending); | |
597 | } | |
598 | ||
599 | if (active_cnt < reclaim_limit) | |
600 | break; | |
601 | ||
602 | /* Reclaim from oldest active member, if possible */ | |
603 | if (!list_empty(active)) { | |
04d7b574 JM |
604 | rm = list_first_entry(active, struct tipc_member, list); |
605 | rm->state = MBR_RECLAIMING; | |
8d5dee21 | 606 | list_del_init(&rm->list); |
04d7b574 | 607 | tipc_group_proto_xmit(grp, rm, GRP_RECLAIM_MSG, xmitq); |
04d7b574 JM |
608 | break; |
609 | } | |
4ea5dab5 JM |
610 | /* Nobody to reclaim from; - revert oldest pending to JOINED */ |
611 | pm = list_first_entry(&grp->pending, struct tipc_member, list); | |
612 | list_del_init(&pm->list); | |
613 | pm->state = MBR_JOINED; | |
614 | tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq); | |
615 | break; | |
04d7b574 JM |
616 | case MBR_ACTIVE: |
617 | if (!list_is_last(&m->list, &grp->active)) | |
618 | list_move_tail(&m->list, &grp->active); | |
619 | if (m->advertised > (ADV_ACTIVE * 3 / 4)) | |
620 | break; | |
621 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq); | |
622 | break; | |
623 | case MBR_REMITTED: | |
624 | if (m->advertised > ADV_IDLE) | |
625 | break; | |
626 | m->state = MBR_JOINED; | |
8d5dee21 | 627 | grp->active_cnt--; |
04d7b574 JM |
628 | if (m->advertised < ADV_IDLE) { |
629 | pr_warn_ratelimited("Rcv unexpected msg after REMIT\n"); | |
b7d42635 | 630 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq); |
04d7b574 | 631 | } |
8d5dee21 | 632 | |
f9c935db JM |
633 | if (list_empty(&grp->pending)) |
634 | return; | |
635 | ||
636 | /* Set oldest pending member to active and advertise */ | |
637 | pm = list_first_entry(&grp->pending, struct tipc_member, list); | |
638 | pm->state = MBR_ACTIVE; | |
639 | list_move_tail(&pm->list, &grp->active); | |
640 | grp->active_cnt++; | |
641 | tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq); | |
b7d42635 | 642 | break; |
04d7b574 | 643 | case MBR_RECLAIMING: |
b7d42635 JM |
644 | case MBR_JOINING: |
645 | case MBR_LEAVING: | |
646 | default: | |
647 | break; | |
648 | } | |
649 | } | |
650 | ||
7ad32bcb JM |
651 | static void tipc_group_create_event(struct tipc_group *grp, |
652 | struct tipc_member *m, | |
653 | u32 event, u16 seqno, | |
654 | struct sk_buff_head *inputq) | |
655 | { u32 dnode = tipc_own_addr(grp->net); | |
656 | struct tipc_event evt; | |
657 | struct sk_buff *skb; | |
658 | struct tipc_msg *hdr; | |
659 | ||
660 | evt.event = event; | |
661 | evt.found_lower = m->instance; | |
662 | evt.found_upper = m->instance; | |
663 | evt.port.ref = m->port; | |
664 | evt.port.node = m->node; | |
665 | evt.s.seq.type = grp->type; | |
666 | evt.s.seq.lower = m->instance; | |
667 | evt.s.seq.upper = m->instance; | |
668 | ||
669 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_GRP_MEMBER_EVT, | |
670 | GROUP_H_SIZE, sizeof(evt), dnode, m->node, | |
671 | grp->portid, m->port, 0); | |
672 | if (!skb) | |
673 | return; | |
674 | ||
675 | hdr = buf_msg(skb); | |
676 | msg_set_nametype(hdr, grp->type); | |
677 | msg_set_grp_evt(hdr, event); | |
678 | msg_set_dest_droppable(hdr, true); | |
679 | msg_set_grp_bc_seqno(hdr, seqno); | |
680 | memcpy(msg_data(hdr), &evt, sizeof(evt)); | |
681 | TIPC_SKB_CB(skb)->orig_member = m->instance; | |
682 | __skb_queue_tail(inputq, skb); | |
683 | } | |
684 | ||
75da2163 JM |
685 | static void tipc_group_proto_xmit(struct tipc_group *grp, struct tipc_member *m, |
686 | int mtyp, struct sk_buff_head *xmitq) | |
687 | { | |
688 | struct tipc_msg *hdr; | |
689 | struct sk_buff *skb; | |
b7d42635 | 690 | int adv = 0; |
75da2163 JM |
691 | |
692 | skb = tipc_msg_create(GROUP_PROTOCOL, mtyp, INT_H_SIZE, 0, | |
693 | m->node, tipc_own_addr(grp->net), | |
694 | m->port, grp->portid, 0); | |
695 | if (!skb) | |
696 | return; | |
697 | ||
04d7b574 | 698 | if (m->state == MBR_ACTIVE) |
b7d42635 | 699 | adv = ADV_ACTIVE - m->advertised; |
04d7b574 JM |
700 | else if (m->state == MBR_JOINED || m->state == MBR_PENDING) |
701 | adv = ADV_IDLE - m->advertised; | |
b7d42635 | 702 | |
75da2163 | 703 | hdr = buf_msg(skb); |
b7d42635 JM |
704 | |
705 | if (mtyp == GRP_JOIN_MSG) { | |
75da2163 | 706 | msg_set_grp_bc_syncpt(hdr, grp->bc_snd_nxt); |
b7d42635 JM |
707 | msg_set_adv_win(hdr, adv); |
708 | m->advertised += adv; | |
a3bada70 JM |
709 | } else if (mtyp == GRP_LEAVE_MSG) { |
710 | msg_set_grp_bc_syncpt(hdr, grp->bc_snd_nxt); | |
b7d42635 JM |
711 | } else if (mtyp == GRP_ADV_MSG) { |
712 | msg_set_adv_win(hdr, adv); | |
713 | m->advertised += adv; | |
2f487712 JM |
714 | } else if (mtyp == GRP_ACK_MSG) { |
715 | msg_set_grp_bc_acked(hdr, m->bc_rcv_nxt); | |
04d7b574 JM |
716 | } else if (mtyp == GRP_REMIT_MSG) { |
717 | msg_set_grp_remitted(hdr, m->window); | |
b7d42635 | 718 | } |
23483399 | 719 | msg_set_dest_droppable(hdr, true); |
75da2163 JM |
720 | __skb_queue_tail(xmitq, skb); |
721 | } | |
722 | ||
b7d42635 JM |
723 | void tipc_group_proto_rcv(struct tipc_group *grp, bool *usr_wakeup, |
724 | struct tipc_msg *hdr, struct sk_buff_head *inputq, | |
75da2163 JM |
725 | struct sk_buff_head *xmitq) |
726 | { | |
727 | u32 node = msg_orignode(hdr); | |
728 | u32 port = msg_origport(hdr); | |
04d7b574 | 729 | struct tipc_member *m, *pm; |
04d7b574 | 730 | u16 remitted, in_flight; |
75da2163 JM |
731 | |
732 | if (!grp) | |
733 | return; | |
734 | ||
735 | m = tipc_group_find_member(grp, node, port); | |
736 | ||
737 | switch (msg_type(hdr)) { | |
738 | case GRP_JOIN_MSG: | |
739 | if (!m) | |
740 | m = tipc_group_create_member(grp, node, port, | |
d12d2e12 | 741 | 0, MBR_JOINING); |
75da2163 JM |
742 | if (!m) |
743 | return; | |
a3bada70 JM |
744 | m->bc_syncpt = msg_grp_bc_syncpt(hdr); |
745 | m->bc_rcv_nxt = m->bc_syncpt; | |
b7d42635 | 746 | m->window += msg_adv_win(hdr); |
75da2163 | 747 | |
d12d2e12 JM |
748 | /* Wait until PUBLISH event is received if necessary */ |
749 | if (m->state != MBR_PUBLISHED) | |
750 | return; | |
751 | ||
752 | /* Member can be taken into service */ | |
753 | m->state = MBR_JOINED; | |
754 | *usr_wakeup = true; | |
755 | m->usr_pending = false; | |
38266ca1 | 756 | list_del_init(&m->small_win); |
bb25c385 | 757 | tipc_group_update_member(m, 0); |
d12d2e12 JM |
758 | tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq); |
759 | tipc_group_create_event(grp, m, TIPC_PUBLISHED, | |
760 | m->bc_syncpt, inputq); | |
75da2163 JM |
761 | return; |
762 | case GRP_LEAVE_MSG: | |
763 | if (!m) | |
764 | return; | |
a3bada70 | 765 | m->bc_syncpt = msg_grp_bc_syncpt(hdr); |
3f42f5fe | 766 | list_del_init(&m->list); |
38266ca1 | 767 | list_del_init(&m->small_win); |
3f42f5fe | 768 | *usr_wakeup = true; |
c2b22bcf JM |
769 | tipc_group_decr_active(grp, m); |
770 | m->state = MBR_LEAVING; | |
7ad32bcb JM |
771 | tipc_group_create_event(grp, m, TIPC_WITHDRAWN, |
772 | m->bc_syncpt, inputq); | |
b7d42635 JM |
773 | return; |
774 | case GRP_ADV_MSG: | |
775 | if (!m) | |
776 | return; | |
777 | m->window += msg_adv_win(hdr); | |
778 | *usr_wakeup = m->usr_pending; | |
779 | m->usr_pending = false; | |
38266ca1 | 780 | list_del_init(&m->small_win); |
75da2163 | 781 | return; |
2f487712 JM |
782 | case GRP_ACK_MSG: |
783 | if (!m) | |
784 | return; | |
785 | m->bc_acked = msg_grp_bc_acked(hdr); | |
786 | if (--grp->bc_ackers) | |
787 | break; | |
788 | *usr_wakeup = true; | |
789 | m->usr_pending = false; | |
790 | return; | |
04d7b574 JM |
791 | case GRP_RECLAIM_MSG: |
792 | if (!m) | |
793 | return; | |
794 | *usr_wakeup = m->usr_pending; | |
795 | m->usr_pending = false; | |
796 | tipc_group_proto_xmit(grp, m, GRP_REMIT_MSG, xmitq); | |
797 | m->window = ADV_IDLE; | |
798 | return; | |
799 | case GRP_REMIT_MSG: | |
800 | if (!m || m->state != MBR_RECLAIMING) | |
801 | return; | |
802 | ||
04d7b574 JM |
803 | remitted = msg_grp_remitted(hdr); |
804 | ||
805 | /* Messages preceding the REMIT still in receive queue */ | |
806 | if (m->advertised > remitted) { | |
807 | m->state = MBR_REMITTED; | |
808 | in_flight = m->advertised - remitted; | |
f9c935db JM |
809 | m->advertised = ADV_IDLE + in_flight; |
810 | return; | |
04d7b574 | 811 | } |
8d5dee21 | 812 | /* This should never happen */ |
04d7b574 | 813 | if (m->advertised < remitted) |
8d5dee21 | 814 | pr_warn_ratelimited("Unexpected REMIT msg\n"); |
04d7b574 | 815 | |
8d5dee21 JM |
816 | /* All messages preceding the REMIT have been read */ |
817 | m->state = MBR_JOINED; | |
f9c935db | 818 | grp->active_cnt--; |
8d5dee21 | 819 | m->advertised = ADV_IDLE; |
04d7b574 JM |
820 | |
821 | /* Set oldest pending member to active and advertise */ | |
822 | if (list_empty(&grp->pending)) | |
823 | return; | |
824 | pm = list_first_entry(&grp->pending, struct tipc_member, list); | |
825 | pm->state = MBR_ACTIVE; | |
826 | list_move_tail(&pm->list, &grp->active); | |
827 | grp->active_cnt++; | |
828 | if (pm->advertised <= (ADV_ACTIVE * 3 / 4)) | |
829 | tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq); | |
830 | return; | |
75da2163 JM |
831 | default: |
832 | pr_warn("Received unknown GROUP_PROTO message\n"); | |
833 | } | |
834 | } | |
835 | ||
b7d42635 JM |
836 | /* tipc_group_member_evt() - receive and handle a member up/down event |
837 | */ | |
75da2163 | 838 | void tipc_group_member_evt(struct tipc_group *grp, |
b7d42635 JM |
839 | bool *usr_wakeup, |
840 | int *sk_rcvbuf, | |
7ad32bcb | 841 | struct tipc_msg *hdr, |
ae236fb2 | 842 | struct sk_buff_head *inputq, |
75da2163 JM |
843 | struct sk_buff_head *xmitq) |
844 | { | |
75da2163 | 845 | struct tipc_event *evt = (void *)msg_data(hdr); |
ae236fb2 | 846 | u32 instance = evt->found_lower; |
75da2163 JM |
847 | u32 node = evt->port.node; |
848 | u32 port = evt->port.ref; | |
ae236fb2 | 849 | int event = evt->event; |
75da2163 JM |
850 | struct tipc_member *m; |
851 | struct net *net; | |
852 | u32 self; | |
853 | ||
854 | if (!grp) | |
7ad32bcb | 855 | return; |
75da2163 JM |
856 | |
857 | net = grp->net; | |
858 | self = tipc_own_addr(net); | |
859 | if (!grp->loopback && node == self && port == grp->portid) | |
7ad32bcb | 860 | return; |
ae236fb2 | 861 | |
75da2163 JM |
862 | m = tipc_group_find_member(grp, node, port); |
863 | ||
d12d2e12 JM |
864 | switch (event) { |
865 | case TIPC_PUBLISHED: | |
866 | /* Send and wait for arrival of JOIN message if necessary */ | |
867 | if (!m) { | |
868 | m = tipc_group_create_member(grp, node, port, instance, | |
869 | MBR_PUBLISHED); | |
870 | if (!m) | |
871 | break; | |
872 | tipc_group_update_member(m, 0); | |
873 | tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq); | |
874 | break; | |
875 | } | |
7ad32bcb | 876 | |
d12d2e12 JM |
877 | if (m->state != MBR_JOINING) |
878 | break; | |
75da2163 | 879 | |
d12d2e12 JM |
880 | /* Member can be taken into service */ |
881 | m->instance = instance; | |
882 | m->state = MBR_JOINED; | |
883 | *usr_wakeup = true; | |
884 | m->usr_pending = false; | |
885 | list_del_init(&m->small_win); | |
d84d1b3b | 886 | tipc_group_update_member(m, 0); |
d12d2e12 JM |
887 | tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq); |
888 | tipc_group_create_event(grp, m, TIPC_PUBLISHED, | |
889 | m->bc_syncpt, inputq); | |
890 | break; | |
891 | case TIPC_WITHDRAWN: | |
75da2163 | 892 | if (!m) |
d12d2e12 | 893 | break; |
ae236fb2 | 894 | |
2f487712 | 895 | *usr_wakeup = true; |
b7d42635 | 896 | m->usr_pending = false; |
c2b22bcf JM |
897 | tipc_group_decr_active(grp, m); |
898 | m->state = MBR_LEAVING; | |
3f42f5fe | 899 | list_del_init(&m->list); |
38266ca1 | 900 | list_del_init(&m->small_win); |
c2b22bcf JM |
901 | |
902 | /* Only send event if no LEAVE message can be expected */ | |
903 | if (!tipc_node_is_up(net, node)) | |
904 | tipc_group_create_event(grp, m, TIPC_WITHDRAWN, | |
905 | m->bc_rcv_nxt, inputq); | |
d12d2e12 JM |
906 | break; |
907 | default: | |
908 | break; | |
75da2163 | 909 | } |
b7d42635 | 910 | *sk_rcvbuf = tipc_group_rcvbuf_limit(grp); |
75da2163 | 911 | } |