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