Commit | Line | Data |
---|---|---|
b97bf3fd PL |
1 | /* |
2 | * net/tipc/bcast.c: TIPC broadcast code | |
c4307285 | 3 | * |
3c724acd | 4 | * Copyright (c) 2004-2006, 2014-2015, Ericsson AB |
b97bf3fd | 5 | * Copyright (c) 2004, Intel Corporation. |
2d627b92 | 6 | * Copyright (c) 2005, 2010-2011, Wind River Systems |
b97bf3fd PL |
7 | * All rights reserved. |
8 | * | |
9ea1fd3c | 9 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
10 | * modification, are permitted provided that the following conditions are met: |
11 | * | |
9ea1fd3c PL |
12 | * 1. Redistributions of source code must retain the above copyright |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * 3. Neither the names of the copyright holders nor the names of its | |
18 | * contributors may be used to endorse or promote products derived from | |
19 | * this software without specific prior written permission. | |
b97bf3fd | 20 | * |
9ea1fd3c PL |
21 | * Alternatively, this software may be distributed under the terms of the |
22 | * GNU General Public License ("GPL") version 2 as published by the Free | |
23 | * Software Foundation. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
26 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
29 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
34 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
35 | * POSSIBILITY OF SUCH DAMAGE. |
36 | */ | |
37 | ||
6beb19a6 | 38 | #include <linux/tipc_config.h> |
078bec82 JPM |
39 | #include "socket.h" |
40 | #include "msg.h" | |
b97bf3fd | 41 | #include "bcast.h" |
9f6bdcd4 | 42 | #include "name_distr.h" |
6beb19a6 JPM |
43 | #include "link.h" |
44 | #include "node.h" | |
b97bf3fd | 45 | |
53387c4e JPM |
46 | #define BCLINK_WIN_DEFAULT 50 /* bcast link window size (default) */ |
47 | #define BCLINK_WIN_MIN 32 /* bcast minimum link window size */ | |
b97bf3fd | 48 | |
3aec9cc9 | 49 | const char tipc_bclink_name[] = "broadcast-link"; |
b97bf3fd | 50 | |
6beb19a6 | 51 | /** |
2af5ae37 | 52 | * struct tipc_bc_base - base structure for keeping broadcast send state |
b06b281e | 53 | * @link: broadcast send link structure |
2af5ae37 JPM |
54 | * @inputq: data input queue; will only carry SOCK_WAKEUP messages |
55 | * @dest: array keeping number of reachable destinations per bearer | |
56 | * @primary_bearer: a bearer having links to all broadcast destinations, if any | |
6beb19a6 JPM |
57 | */ |
58 | struct tipc_bc_base { | |
32301906 | 59 | struct tipc_link *link; |
6beb19a6 | 60 | struct sk_buff_head inputq; |
b06b281e JPM |
61 | int dests[MAX_BEARERS]; |
62 | int primary_bearer; | |
6beb19a6 JPM |
63 | }; |
64 | ||
5fd9fd63 JPM |
65 | static struct tipc_bc_base *tipc_bc_base(struct net *net) |
66 | { | |
67 | return tipc_net(net)->bcbase; | |
68 | } | |
69 | ||
959e1781 | 70 | int tipc_bcast_get_mtu(struct net *net) |
078bec82 | 71 | { |
959e1781 | 72 | return tipc_link_mtu(tipc_bc_sndlink(net)); |
078bec82 JPM |
73 | } |
74 | ||
b06b281e JPM |
75 | /* tipc_bcbase_select_primary(): find a bearer with links to all destinations, |
76 | * if any, and make it primary bearer | |
77 | */ | |
78 | static void tipc_bcbase_select_primary(struct net *net) | |
79 | { | |
80 | struct tipc_bc_base *bb = tipc_bc_base(net); | |
81 | int all_dests = tipc_link_bc_peers(bb->link); | |
959e1781 | 82 | int i, mtu; |
b06b281e JPM |
83 | |
84 | bb->primary_bearer = INVALID_BEARER_ID; | |
85 | ||
86 | if (!all_dests) | |
87 | return; | |
88 | ||
89 | for (i = 0; i < MAX_BEARERS; i++) { | |
959e1781 JPM |
90 | if (!bb->dests[i]) |
91 | continue; | |
92 | ||
93 | mtu = tipc_bearer_mtu(net, i); | |
94 | if (mtu < tipc_link_mtu(bb->link)) | |
95 | tipc_link_set_mtu(bb->link, mtu); | |
96 | ||
b06b281e JPM |
97 | if (bb->dests[i] < all_dests) |
98 | continue; | |
99 | ||
100 | bb->primary_bearer = i; | |
101 | ||
102 | /* Reduce risk that all nodes select same primary */ | |
103 | if ((i ^ tipc_own_addr(net)) & 1) | |
104 | break; | |
105 | } | |
106 | } | |
107 | ||
108 | void tipc_bcast_inc_bearer_dst_cnt(struct net *net, int bearer_id) | |
109 | { | |
110 | struct tipc_bc_base *bb = tipc_bc_base(net); | |
111 | ||
112 | tipc_bcast_lock(net); | |
113 | bb->dests[bearer_id]++; | |
114 | tipc_bcbase_select_primary(net); | |
115 | tipc_bcast_unlock(net); | |
116 | } | |
117 | ||
118 | void tipc_bcast_dec_bearer_dst_cnt(struct net *net, int bearer_id) | |
119 | { | |
120 | struct tipc_bc_base *bb = tipc_bc_base(net); | |
121 | ||
122 | tipc_bcast_lock(net); | |
123 | bb->dests[bearer_id]--; | |
124 | tipc_bcbase_select_primary(net); | |
125 | tipc_bcast_unlock(net); | |
126 | } | |
127 | ||
b06b281e JPM |
128 | /* tipc_bcbase_xmit - broadcast a packet queue across one or more bearers |
129 | * | |
130 | * Note that number of reachable destinations, as indicated in the dests[] | |
131 | * array, may transitionally differ from the number of destinations indicated | |
132 | * in each sent buffer. We can sustain this. Excess destination nodes will | |
133 | * drop and never acknowledge the unexpected packets, and missing destinations | |
134 | * will either require retransmission (if they are just about to be added to | |
135 | * the bearer), or be removed from the buffer's 'ackers' counter (if they | |
136 | * just went down) | |
137 | */ | |
138 | static void tipc_bcbase_xmit(struct net *net, struct sk_buff_head *xmitq) | |
139 | { | |
140 | int bearer_id; | |
141 | struct tipc_bc_base *bb = tipc_bc_base(net); | |
142 | struct sk_buff *skb, *_skb; | |
143 | struct sk_buff_head _xmitq; | |
144 | ||
145 | if (skb_queue_empty(xmitq)) | |
146 | return; | |
147 | ||
148 | /* The typical case: at least one bearer has links to all nodes */ | |
149 | bearer_id = bb->primary_bearer; | |
150 | if (bearer_id >= 0) { | |
151 | tipc_bearer_bc_xmit(net, bearer_id, xmitq); | |
152 | return; | |
153 | } | |
154 | ||
155 | /* We have to transmit across all bearers */ | |
156 | skb_queue_head_init(&_xmitq); | |
157 | for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) { | |
158 | if (!bb->dests[bearer_id]) | |
159 | continue; | |
160 | ||
161 | skb_queue_walk(xmitq, skb) { | |
162 | _skb = pskb_copy_for_clone(skb, GFP_ATOMIC); | |
163 | if (!_skb) | |
164 | break; | |
165 | __skb_queue_tail(&_xmitq, _skb); | |
166 | } | |
167 | tipc_bearer_bc_xmit(net, bearer_id, &_xmitq); | |
168 | } | |
169 | __skb_queue_purge(xmitq); | |
170 | __skb_queue_purge(&_xmitq); | |
171 | } | |
172 | ||
6beb19a6 | 173 | /* tipc_bcast_xmit - deliver buffer chain to all nodes in cluster |
9fbfb8b1 | 174 | * and to identified node local sockets |
f2f9800d | 175 | * @net: the applicable net namespace |
a6ca1094 | 176 | * @list: chain of buffers containing message |
078bec82 JPM |
177 | * Consumes the buffer chain, except when returning -ELINKCONG |
178 | * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE | |
179 | */ | |
6beb19a6 | 180 | int tipc_bcast_xmit(struct net *net, struct sk_buff_head *list) |
078bec82 | 181 | { |
2f566124 JPM |
182 | struct tipc_link *l = tipc_bc_sndlink(net); |
183 | struct sk_buff_head xmitq, inputq, rcvq; | |
078bec82 | 184 | int rc = 0; |
078bec82 | 185 | |
2f566124 JPM |
186 | __skb_queue_head_init(&rcvq); |
187 | __skb_queue_head_init(&xmitq); | |
188 | skb_queue_head_init(&inputq); | |
22d85c79 | 189 | |
2f566124 JPM |
190 | /* Prepare message clone for local node */ |
191 | if (unlikely(!tipc_msg_reassemble(list, &rcvq))) | |
192 | return -EHOSTUNREACH; | |
078bec82 | 193 | |
2f566124 JPM |
194 | tipc_bcast_lock(net); |
195 | if (tipc_link_bc_peers(l)) | |
196 | rc = tipc_link_xmit(l, list, &xmitq); | |
2f566124 | 197 | tipc_bcast_unlock(net); |
078bec82 | 198 | |
2f566124 | 199 | /* Don't send to local node if adding to link failed */ |
cb1b7280 | 200 | if (unlikely(rc)) { |
2f566124 | 201 | __skb_queue_purge(&rcvq); |
cb1b7280 JPM |
202 | return rc; |
203 | } | |
52666986 | 204 | |
2f566124 | 205 | /* Broadcast to all nodes, inluding local node */ |
b06b281e | 206 | tipc_bcbase_xmit(net, &xmitq); |
2f566124 JPM |
207 | tipc_sk_mcast_rcv(net, &rcvq, &inputq); |
208 | __skb_queue_purge(list); | |
209 | return 0; | |
078bec82 | 210 | } |
52666986 JPM |
211 | |
212 | /* tipc_bcast_rcv - receive a broadcast packet, and deliver to rcv link | |
213 | * | |
214 | * RCU is locked, no other locks set | |
215 | */ | |
216 | int tipc_bcast_rcv(struct net *net, struct tipc_link *l, struct sk_buff *skb) | |
217 | { | |
218 | struct tipc_msg *hdr = buf_msg(skb); | |
219 | struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq; | |
220 | struct sk_buff_head xmitq; | |
221 | int rc; | |
222 | ||
223 | __skb_queue_head_init(&xmitq); | |
224 | ||
225 | if (msg_mc_netid(hdr) != tipc_netid(net) || !tipc_link_is_up(l)) { | |
226 | kfree_skb(skb); | |
227 | return 0; | |
228 | } | |
229 | ||
230 | tipc_bcast_lock(net); | |
231 | if (msg_user(hdr) == BCAST_PROTOCOL) | |
232 | rc = tipc_link_bc_nack_rcv(l, skb, &xmitq); | |
233 | else | |
234 | rc = tipc_link_rcv(l, skb, NULL); | |
235 | tipc_bcast_unlock(net); | |
236 | ||
b06b281e | 237 | tipc_bcbase_xmit(net, &xmitq); |
52666986 JPM |
238 | |
239 | /* Any socket wakeup messages ? */ | |
240 | if (!skb_queue_empty(inputq)) | |
241 | tipc_sk_rcv(net, inputq); | |
242 | ||
243 | return rc; | |
244 | } | |
245 | ||
246 | /* tipc_bcast_ack_rcv - receive and handle a broadcast acknowledge | |
247 | * | |
248 | * RCU is locked, no other locks set | |
249 | */ | |
250 | void tipc_bcast_ack_rcv(struct net *net, struct tipc_link *l, u32 acked) | |
251 | { | |
252 | struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq; | |
253 | struct sk_buff_head xmitq; | |
254 | ||
255 | __skb_queue_head_init(&xmitq); | |
256 | ||
257 | tipc_bcast_lock(net); | |
258 | tipc_link_bc_ack_rcv(l, acked, &xmitq); | |
259 | tipc_bcast_unlock(net); | |
260 | ||
b06b281e | 261 | tipc_bcbase_xmit(net, &xmitq); |
52666986 JPM |
262 | |
263 | /* Any socket wakeup messages ? */ | |
264 | if (!skb_queue_empty(inputq)) | |
265 | tipc_sk_rcv(net, inputq); | |
266 | } | |
267 | ||
268 | /* tipc_bcast_synch_rcv - check and update rcv link with peer's send state | |
269 | * | |
270 | * RCU is locked, no other locks set | |
271 | */ | |
272 | void tipc_bcast_sync_rcv(struct net *net, struct tipc_link *l, | |
273 | struct tipc_msg *hdr) | |
274 | { | |
275 | struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq; | |
276 | struct sk_buff_head xmitq; | |
277 | ||
278 | __skb_queue_head_init(&xmitq); | |
279 | ||
280 | tipc_bcast_lock(net); | |
281 | if (msg_type(hdr) == STATE_MSG) { | |
282 | tipc_link_bc_ack_rcv(l, msg_bcast_ack(hdr), &xmitq); | |
283 | tipc_link_bc_sync_rcv(l, hdr, &xmitq); | |
284 | } else { | |
285 | tipc_link_bc_init_rcv(l, hdr); | |
286 | } | |
287 | tipc_bcast_unlock(net); | |
288 | ||
b06b281e | 289 | tipc_bcbase_xmit(net, &xmitq); |
52666986 JPM |
290 | |
291 | /* Any socket wakeup messages ? */ | |
292 | if (!skb_queue_empty(inputq)) | |
293 | tipc_sk_rcv(net, inputq); | |
294 | } | |
295 | ||
296 | /* tipc_bcast_add_peer - add a peer node to broadcast link and bearer | |
297 | * | |
298 | * RCU is locked, node lock is set | |
299 | */ | |
b06b281e | 300 | void tipc_bcast_add_peer(struct net *net, struct tipc_link *uc_l, |
52666986 JPM |
301 | struct sk_buff_head *xmitq) |
302 | { | |
52666986 JPM |
303 | struct tipc_link *snd_l = tipc_bc_sndlink(net); |
304 | ||
b06b281e | 305 | tipc_bcast_lock(net); |
52666986 | 306 | tipc_link_add_bc_peer(snd_l, uc_l, xmitq); |
b06b281e JPM |
307 | tipc_bcbase_select_primary(net); |
308 | tipc_bcast_unlock(net); | |
52666986 JPM |
309 | } |
310 | ||
311 | /* tipc_bcast_remove_peer - remove a peer node from broadcast link and bearer | |
312 | * | |
313 | * RCU is locked, node lock is set | |
314 | */ | |
b06b281e | 315 | void tipc_bcast_remove_peer(struct net *net, struct tipc_link *rcv_l) |
52666986 | 316 | { |
52666986 | 317 | struct tipc_link *snd_l = tipc_bc_sndlink(net); |
b06b281e | 318 | struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq; |
52666986 JPM |
319 | struct sk_buff_head xmitq; |
320 | ||
321 | __skb_queue_head_init(&xmitq); | |
322 | ||
b06b281e | 323 | tipc_bcast_lock(net); |
52666986 | 324 | tipc_link_remove_bc_peer(snd_l, rcv_l, &xmitq); |
b06b281e JPM |
325 | tipc_bcbase_select_primary(net); |
326 | tipc_bcast_unlock(net); | |
52666986 | 327 | |
b06b281e | 328 | tipc_bcbase_xmit(net, &xmitq); |
52666986 JPM |
329 | |
330 | /* Any socket wakeup messages ? */ | |
331 | if (!skb_queue_empty(inputq)) | |
332 | tipc_sk_rcv(net, inputq); | |
333 | } | |
334 | ||
1da46568 | 335 | int tipc_bclink_reset_stats(struct net *net) |
b97bf3fd | 336 | { |
38206d59 | 337 | struct tipc_link *l = tipc_bc_sndlink(net); |
1da46568 | 338 | |
38206d59 | 339 | if (!l) |
b97bf3fd PL |
340 | return -ENOPROTOOPT; |
341 | ||
2af5ae37 | 342 | tipc_bcast_lock(net); |
38206d59 | 343 | tipc_link_reset_stats(l); |
2af5ae37 | 344 | tipc_bcast_unlock(net); |
0e35fd5e | 345 | return 0; |
b97bf3fd PL |
346 | } |
347 | ||
2af5ae37 | 348 | static int tipc_bc_link_set_queue_limits(struct net *net, u32 limit) |
b97bf3fd | 349 | { |
2af5ae37 | 350 | struct tipc_link *l = tipc_bc_sndlink(net); |
1da46568 | 351 | |
2af5ae37 | 352 | if (!l) |
b97bf3fd | 353 | return -ENOPROTOOPT; |
53387c4e JPM |
354 | if (limit < BCLINK_WIN_MIN) |
355 | limit = BCLINK_WIN_MIN; | |
356 | if (limit > TIPC_MAX_LINK_WIN) | |
b97bf3fd | 357 | return -EINVAL; |
2af5ae37 JPM |
358 | tipc_bcast_lock(net); |
359 | tipc_link_set_queue_limits(l, limit); | |
360 | tipc_bcast_unlock(net); | |
0e35fd5e | 361 | return 0; |
b97bf3fd PL |
362 | } |
363 | ||
670f4f88 RA |
364 | int tipc_nl_bc_link_set(struct net *net, struct nlattr *attrs[]) |
365 | { | |
366 | int err; | |
367 | u32 win; | |
368 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
369 | ||
370 | if (!attrs[TIPC_NLA_LINK_PROP]) | |
371 | return -EINVAL; | |
372 | ||
373 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props); | |
374 | if (err) | |
375 | return err; | |
376 | ||
377 | if (!props[TIPC_NLA_PROP_WIN]) | |
378 | return -EOPNOTSUPP; | |
379 | ||
380 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
381 | ||
2af5ae37 | 382 | return tipc_bc_link_set_queue_limits(net, win); |
670f4f88 RA |
383 | } |
384 | ||
6beb19a6 | 385 | int tipc_bcast_init(struct net *net) |
b97bf3fd | 386 | { |
32301906 | 387 | struct tipc_net *tn = tipc_net(net); |
32301906 JPM |
388 | struct tipc_bc_base *bb = NULL; |
389 | struct tipc_link *l = NULL; | |
390 | ||
32301906 JPM |
391 | bb = kzalloc(sizeof(*bb), GFP_ATOMIC); |
392 | if (!bb) | |
393 | goto enomem; | |
394 | tn->bcbase = bb; | |
0043550b | 395 | spin_lock_init(&tipc_net(net)->bclock); |
32301906 | 396 | |
c72fa872 | 397 | if (!tipc_link_bc_create(net, 0, 0, |
959e1781 | 398 | U16_MAX, |
32301906 | 399 | BCLINK_WIN_DEFAULT, |
fd556f20 | 400 | 0, |
32301906 | 401 | &bb->inputq, |
2af5ae37 | 402 | NULL, |
52666986 | 403 | NULL, |
32301906 JPM |
404 | &l)) |
405 | goto enomem; | |
406 | bb->link = l; | |
407 | tn->bcl = l; | |
eb8b00f5 | 408 | return 0; |
32301906 | 409 | enomem: |
32301906 JPM |
410 | kfree(bb); |
411 | kfree(l); | |
412 | return -ENOMEM; | |
b97bf3fd PL |
413 | } |
414 | ||
5fd9fd63 JPM |
415 | void tipc_bcast_reinit(struct net *net) |
416 | { | |
38206d59 | 417 | tipc_link_reinit(tipc_bc_sndlink(net), tipc_own_addr(net)); |
5fd9fd63 JPM |
418 | } |
419 | ||
6beb19a6 | 420 | void tipc_bcast_stop(struct net *net) |
b97bf3fd | 421 | { |
7f9f95d9 YX |
422 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
423 | ||
eb8b00f5 | 424 | synchronize_net(); |
6beb19a6 | 425 | kfree(tn->bcbase); |
32301906 | 426 | kfree(tn->bcl); |
b97bf3fd | 427 | } |