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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
e74a386d | 4 | * Copyright (c) 1996-2007, 2012-2016, Ericsson AB |
198d73b8 | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
e3eea1eb | 38 | #include "subscr.h" |
b97bf3fd | 39 | #include "link.h" |
7be57fc6 | 40 | #include "bcast.h" |
9816f061 | 41 | #include "socket.h" |
b97bf3fd | 42 | #include "name_distr.h" |
b97bf3fd | 43 | #include "discover.h" |
0655f6a8 | 44 | #include "netlink.h" |
35c55c98 | 45 | #include "monitor.h" |
b97bf3fd | 46 | |
796c75d0 YX |
47 | #include <linux/pkt_sched.h> |
48 | ||
38206d59 JPM |
49 | struct tipc_stats { |
50 | u32 sent_info; /* used in counting # sent packets */ | |
51 | u32 recv_info; /* used in counting # recv'd packets */ | |
52 | u32 sent_states; | |
53 | u32 recv_states; | |
54 | u32 sent_probes; | |
55 | u32 recv_probes; | |
56 | u32 sent_nacks; | |
57 | u32 recv_nacks; | |
58 | u32 sent_acks; | |
59 | u32 sent_bundled; | |
60 | u32 sent_bundles; | |
61 | u32 recv_bundled; | |
62 | u32 recv_bundles; | |
63 | u32 retransmitted; | |
64 | u32 sent_fragmented; | |
65 | u32 sent_fragments; | |
66 | u32 recv_fragmented; | |
67 | u32 recv_fragments; | |
68 | u32 link_congs; /* # port sends blocked by congestion */ | |
69 | u32 deferred_recv; | |
70 | u32 duplicates; | |
71 | u32 max_queue_sz; /* send queue size high water mark */ | |
72 | u32 accu_queue_sz; /* used for send queue size profiling */ | |
73 | u32 queue_sz_counts; /* used for send queue size profiling */ | |
74 | u32 msg_length_counts; /* used for message length profiling */ | |
75 | u32 msg_lengths_total; /* used for message length profiling */ | |
76 | u32 msg_length_profile[7]; /* used for msg. length profiling */ | |
77 | }; | |
78 | ||
79 | /** | |
80 | * struct tipc_link - TIPC link data structure | |
81 | * @addr: network address of link's peer node | |
82 | * @name: link name character string | |
83 | * @media_addr: media address to use when sending messages over link | |
84 | * @timer: link timer | |
85 | * @net: pointer to namespace struct | |
86 | * @refcnt: reference counter for permanent references (owner node & timer) | |
87 | * @peer_session: link session # being used by peer end of link | |
88 | * @peer_bearer_id: bearer id used by link's peer endpoint | |
89 | * @bearer_id: local bearer id used by link | |
90 | * @tolerance: minimum link continuity loss needed to reset link [in ms] | |
38206d59 JPM |
91 | * @abort_limit: # of unacknowledged continuity probes needed to reset link |
92 | * @state: current state of link FSM | |
93 | * @peer_caps: bitmap describing capabilities of peer node | |
94 | * @silent_intv_cnt: # of timer intervals without any reception from peer | |
95 | * @proto_msg: template for control messages generated by link | |
96 | * @pmsg: convenience pointer to "proto_msg" field | |
97 | * @priority: current link priority | |
98 | * @net_plane: current link network plane ('A' through 'H') | |
35c55c98 | 99 | * @mon_state: cookie with information needed by link monitor |
38206d59 JPM |
100 | * @backlog_limit: backlog queue congestion thresholds (indexed by importance) |
101 | * @exp_msg_count: # of tunnelled messages expected during link changeover | |
102 | * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset | |
103 | * @mtu: current maximum packet size for this link | |
104 | * @advertised_mtu: advertised own mtu when link is being established | |
105 | * @transmitq: queue for sent, non-acked messages | |
106 | * @backlogq: queue for messages waiting to be sent | |
107 | * @snt_nxt: next sequence number to use for outbound messages | |
108 | * @last_retransmitted: sequence number of most recently retransmitted message | |
109 | * @stale_count: # of identical retransmit requests made by peer | |
110 | * @ackers: # of peers that needs to ack each packet before it can be released | |
111 | * @acked: # last packet acked by a certain peer. Used for broadcast. | |
112 | * @rcv_nxt: next sequence number to expect for inbound messages | |
113 | * @deferred_queue: deferred queue saved OOS b'cast message received from node | |
114 | * @unacked_window: # of inbound messages rx'd without ack'ing back to peer | |
115 | * @inputq: buffer queue for messages to be delivered upwards | |
116 | * @namedq: buffer queue for name table messages to be delivered upwards | |
117 | * @next_out: ptr to first unsent outbound message in queue | |
118 | * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate | |
119 | * @long_msg_seq_no: next identifier to use for outbound fragmented messages | |
120 | * @reasm_buf: head of partially reassembled inbound message fragments | |
121 | * @bc_rcvr: marks that this is a broadcast receiver link | |
122 | * @stats: collects statistics regarding link activity | |
123 | */ | |
124 | struct tipc_link { | |
125 | u32 addr; | |
126 | char name[TIPC_MAX_LINK_NAME]; | |
38206d59 JPM |
127 | struct net *net; |
128 | ||
129 | /* Management and link supervision data */ | |
130 | u32 peer_session; | |
e74a386d | 131 | u32 session; |
38206d59 JPM |
132 | u32 peer_bearer_id; |
133 | u32 bearer_id; | |
134 | u32 tolerance; | |
38206d59 JPM |
135 | u32 abort_limit; |
136 | u32 state; | |
137 | u16 peer_caps; | |
138 | bool active; | |
139 | u32 silent_intv_cnt; | |
e74a386d | 140 | char if_name[TIPC_MAX_IF_NAME]; |
38206d59 JPM |
141 | u32 priority; |
142 | char net_plane; | |
35c55c98 | 143 | struct tipc_mon_state mon_state; |
88e8ac70 | 144 | u16 rst_cnt; |
38206d59 JPM |
145 | |
146 | /* Failover/synch */ | |
147 | u16 drop_point; | |
148 | struct sk_buff *failover_reasm_skb; | |
149 | ||
150 | /* Max packet negotiation */ | |
151 | u16 mtu; | |
152 | u16 advertised_mtu; | |
153 | ||
154 | /* Sending */ | |
155 | struct sk_buff_head transmq; | |
156 | struct sk_buff_head backlogq; | |
157 | struct { | |
158 | u16 len; | |
159 | u16 limit; | |
160 | } backlog[5]; | |
161 | u16 snd_nxt; | |
162 | u16 last_retransm; | |
163 | u16 window; | |
164 | u32 stale_count; | |
165 | ||
166 | /* Reception */ | |
167 | u16 rcv_nxt; | |
168 | u32 rcv_unacked; | |
169 | struct sk_buff_head deferdq; | |
170 | struct sk_buff_head *inputq; | |
171 | struct sk_buff_head *namedq; | |
172 | ||
173 | /* Congestion handling */ | |
174 | struct sk_buff_head wakeupq; | |
175 | ||
176 | /* Fragmentation/reassembly */ | |
177 | struct sk_buff *reasm_buf; | |
178 | ||
179 | /* Broadcast */ | |
180 | u16 ackers; | |
181 | u16 acked; | |
182 | struct tipc_link *bc_rcvlink; | |
183 | struct tipc_link *bc_sndlink; | |
7c4a54b9 JPM |
184 | unsigned long prev_retr; |
185 | u16 prev_from; | |
186 | u16 prev_to; | |
187 | u8 nack_state; | |
38206d59 JPM |
188 | bool bc_peer_is_up; |
189 | ||
190 | /* Statistics */ | |
191 | struct tipc_stats stats; | |
192 | }; | |
193 | ||
2cf8aa19 EH |
194 | /* |
195 | * Error message prefixes | |
196 | */ | |
6e498158 | 197 | static const char *link_co_err = "Link tunneling error, "; |
2cf8aa19 | 198 | static const char *link_rst_msg = "Resetting link "; |
7be57fc6 | 199 | |
52666986 JPM |
200 | /* Send states for broadcast NACKs |
201 | */ | |
202 | enum { | |
203 | BC_NACK_SND_CONDITIONAL, | |
204 | BC_NACK_SND_UNCONDITIONAL, | |
205 | BC_NACK_SND_SUPPRESS, | |
206 | }; | |
207 | ||
7c4a54b9 JPM |
208 | #define TIPC_BC_RETR_LIMIT 10 /* [ms] */ |
209 | ||
d999297c JPM |
210 | /* |
211 | * Interval between NACKs when packets arrive out of order | |
212 | */ | |
213 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
e74a386d JPM |
214 | |
215 | /* Wildcard value for link session numbers. When it is known that | |
216 | * peer endpoint is down, any session number must be accepted. | |
a686e685 | 217 | */ |
e74a386d | 218 | #define ANY_SESSION 0x10000 |
a686e685 | 219 | |
662921cd | 220 | /* Link FSM states: |
b97bf3fd | 221 | */ |
d3504c34 | 222 | enum { |
662921cd JPM |
223 | LINK_ESTABLISHED = 0xe, |
224 | LINK_ESTABLISHING = 0xe << 4, | |
225 | LINK_RESET = 0x1 << 8, | |
226 | LINK_RESETTING = 0x2 << 12, | |
227 | LINK_PEER_RESET = 0xd << 16, | |
228 | LINK_FAILINGOVER = 0xf << 20, | |
229 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
230 | }; |
231 | ||
232 | /* Link FSM state checking routines | |
233 | */ | |
662921cd | 234 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 235 | { |
662921cd | 236 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 237 | } |
b97bf3fd | 238 | |
d999297c JPM |
239 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
240 | struct sk_buff_head *xmitq); | |
426cc2b8 JPM |
241 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
242 | u16 rcvgap, int tolerance, int priority, | |
243 | struct sk_buff_head *xmitq); | |
1a90632d | 244 | static void link_print(struct tipc_link *l, const char *str); |
52666986 JPM |
245 | static void tipc_link_build_nack_msg(struct tipc_link *l, |
246 | struct sk_buff_head *xmitq); | |
247 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, | |
248 | struct sk_buff_head *xmitq); | |
249 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 to); | |
8b4ed863 | 250 | |
b97bf3fd | 251 | /* |
05790c64 | 252 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 253 | */ |
662921cd | 254 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 255 | { |
662921cd JPM |
256 | return link_is_up(l); |
257 | } | |
258 | ||
c8199300 JPM |
259 | bool tipc_link_peer_is_down(struct tipc_link *l) |
260 | { | |
261 | return l->state == LINK_PEER_RESET; | |
262 | } | |
263 | ||
662921cd JPM |
264 | bool tipc_link_is_reset(struct tipc_link *l) |
265 | { | |
266 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
267 | } | |
268 | ||
73f646ce JPM |
269 | bool tipc_link_is_establishing(struct tipc_link *l) |
270 | { | |
271 | return l->state == LINK_ESTABLISHING; | |
272 | } | |
273 | ||
662921cd JPM |
274 | bool tipc_link_is_synching(struct tipc_link *l) |
275 | { | |
276 | return l->state == LINK_SYNCHING; | |
277 | } | |
278 | ||
279 | bool tipc_link_is_failingover(struct tipc_link *l) | |
280 | { | |
281 | return l->state == LINK_FAILINGOVER; | |
282 | } | |
283 | ||
284 | bool tipc_link_is_blocked(struct tipc_link *l) | |
285 | { | |
286 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
287 | } |
288 | ||
742e0383 | 289 | static bool link_is_bc_sndlink(struct tipc_link *l) |
52666986 JPM |
290 | { |
291 | return !l->bc_sndlink; | |
292 | } | |
293 | ||
742e0383 | 294 | static bool link_is_bc_rcvlink(struct tipc_link *l) |
52666986 JPM |
295 | { |
296 | return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); | |
297 | } | |
298 | ||
9d13ec65 | 299 | int tipc_link_is_active(struct tipc_link *l) |
b97bf3fd | 300 | { |
c72fa872 JPM |
301 | return l->active; |
302 | } | |
9d13ec65 | 303 | |
c72fa872 JPM |
304 | void tipc_link_set_active(struct tipc_link *l, bool active) |
305 | { | |
306 | l->active = active; | |
b97bf3fd PL |
307 | } |
308 | ||
38206d59 JPM |
309 | u32 tipc_link_id(struct tipc_link *l) |
310 | { | |
311 | return l->peer_bearer_id << 16 | l->bearer_id; | |
312 | } | |
313 | ||
314 | int tipc_link_window(struct tipc_link *l) | |
315 | { | |
316 | return l->window; | |
317 | } | |
318 | ||
319 | int tipc_link_prio(struct tipc_link *l) | |
320 | { | |
321 | return l->priority; | |
322 | } | |
323 | ||
324 | unsigned long tipc_link_tolerance(struct tipc_link *l) | |
325 | { | |
326 | return l->tolerance; | |
327 | } | |
328 | ||
329 | struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) | |
330 | { | |
331 | return l->inputq; | |
332 | } | |
333 | ||
334 | char tipc_link_plane(struct tipc_link *l) | |
335 | { | |
336 | return l->net_plane; | |
337 | } | |
338 | ||
52666986 JPM |
339 | void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
340 | struct tipc_link *uc_l, | |
341 | struct sk_buff_head *xmitq) | |
2f566124 | 342 | { |
52666986 JPM |
343 | struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
344 | ||
345 | snd_l->ackers++; | |
346 | rcv_l->acked = snd_l->snd_nxt - 1; | |
9a650838 | 347 | snd_l->state = LINK_ESTABLISHED; |
52666986 | 348 | tipc_link_build_bc_init_msg(uc_l, xmitq); |
2f566124 JPM |
349 | } |
350 | ||
52666986 JPM |
351 | void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
352 | struct tipc_link *rcv_l, | |
353 | struct sk_buff_head *xmitq) | |
2f566124 | 354 | { |
52666986 JPM |
355 | u16 ack = snd_l->snd_nxt - 1; |
356 | ||
357 | snd_l->ackers--; | |
a71eb720 JPM |
358 | rcv_l->bc_peer_is_up = true; |
359 | rcv_l->state = LINK_ESTABLISHED; | |
52666986 JPM |
360 | tipc_link_bc_ack_rcv(rcv_l, ack, xmitq); |
361 | tipc_link_reset(rcv_l); | |
362 | rcv_l->state = LINK_RESET; | |
363 | if (!snd_l->ackers) { | |
364 | tipc_link_reset(snd_l); | |
9a650838 | 365 | snd_l->state = LINK_RESET; |
52666986 JPM |
366 | __skb_queue_purge(xmitq); |
367 | } | |
2f566124 JPM |
368 | } |
369 | ||
370 | int tipc_link_bc_peers(struct tipc_link *l) | |
371 | { | |
372 | return l->ackers; | |
373 | } | |
374 | ||
02d11ca2 JPM |
375 | u16 link_bc_rcv_gap(struct tipc_link *l) |
376 | { | |
377 | struct sk_buff *skb = skb_peek(&l->deferdq); | |
378 | u16 gap = 0; | |
379 | ||
380 | if (more(l->snd_nxt, l->rcv_nxt)) | |
381 | gap = l->snd_nxt - l->rcv_nxt; | |
382 | if (skb) | |
383 | gap = buf_seqno(skb) - l->rcv_nxt; | |
384 | return gap; | |
385 | } | |
386 | ||
959e1781 JPM |
387 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
388 | { | |
389 | l->mtu = mtu; | |
390 | } | |
391 | ||
392 | int tipc_link_mtu(struct tipc_link *l) | |
393 | { | |
394 | return l->mtu; | |
395 | } | |
396 | ||
38206d59 JPM |
397 | u16 tipc_link_rcv_nxt(struct tipc_link *l) |
398 | { | |
399 | return l->rcv_nxt; | |
400 | } | |
401 | ||
402 | u16 tipc_link_acked(struct tipc_link *l) | |
403 | { | |
404 | return l->acked; | |
405 | } | |
406 | ||
407 | char *tipc_link_name(struct tipc_link *l) | |
408 | { | |
409 | return l->name; | |
410 | } | |
411 | ||
b97bf3fd | 412 | /** |
4323add6 | 413 | * tipc_link_create - create a new link |
440d8963 | 414 | * @n: pointer to associated node |
0e05498e JPM |
415 | * @if_name: associated interface name |
416 | * @bearer_id: id (index) of associated bearer | |
417 | * @tolerance: link tolerance to be used by link | |
418 | * @net_plane: network plane (A,B,c..) this link belongs to | |
419 | * @mtu: mtu to be advertised by link | |
420 | * @priority: priority to be used by link | |
421 | * @window: send window to be used by link | |
422 | * @session: session to be used by link | |
440d8963 | 423 | * @ownnode: identity of own node |
0e05498e | 424 | * @peer: node id of peer node |
fd556f20 | 425 | * @peer_caps: bitmap describing peer node capabilities |
52666986 JPM |
426 | * @bc_sndlink: the namespace global link used for broadcast sending |
427 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
440d8963 JPM |
428 | * @inputq: queue to put messages ready for delivery |
429 | * @namedq: queue to put binding table update messages ready for delivery | |
430 | * @link: return value, pointer to put the created link | |
c4307285 | 431 | * |
440d8963 | 432 | * Returns true if link was created, otherwise false |
b97bf3fd | 433 | */ |
c72fa872 | 434 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
0e05498e JPM |
435 | int tolerance, char net_plane, u32 mtu, int priority, |
436 | int window, u32 session, u32 ownnode, u32 peer, | |
52666986 | 437 | u16 peer_caps, |
52666986 JPM |
438 | struct tipc_link *bc_sndlink, |
439 | struct tipc_link *bc_rcvlink, | |
440 | struct sk_buff_head *inputq, | |
441 | struct sk_buff_head *namedq, | |
440d8963 | 442 | struct tipc_link **link) |
b97bf3fd | 443 | { |
440d8963 | 444 | struct tipc_link *l; |
37b9c08a | 445 | |
440d8963 JPM |
446 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
447 | if (!l) | |
448 | return false; | |
449 | *link = l; | |
e74a386d | 450 | l->session = session; |
37b9c08a | 451 | |
440d8963 | 452 | /* Note: peer i/f name is completed by reset/activate message */ |
440d8963 JPM |
453 | sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
454 | tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode), | |
455 | if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
e74a386d | 456 | strcpy(l->if_name, if_name); |
440d8963 | 457 | l->addr = peer; |
fd556f20 | 458 | l->peer_caps = peer_caps; |
c72fa872 | 459 | l->net = net; |
e74a386d | 460 | l->peer_session = ANY_SESSION; |
0e05498e JPM |
461 | l->bearer_id = bearer_id; |
462 | l->tolerance = tolerance; | |
463 | l->net_plane = net_plane; | |
464 | l->advertised_mtu = mtu; | |
465 | l->mtu = mtu; | |
466 | l->priority = priority; | |
467 | tipc_link_set_queue_limits(l, window); | |
c1ab3f1d | 468 | l->ackers = 1; |
52666986 JPM |
469 | l->bc_sndlink = bc_sndlink; |
470 | l->bc_rcvlink = bc_rcvlink; | |
440d8963 JPM |
471 | l->inputq = inputq; |
472 | l->namedq = namedq; | |
473 | l->state = LINK_RESETTING; | |
440d8963 JPM |
474 | __skb_queue_head_init(&l->transmq); |
475 | __skb_queue_head_init(&l->backlogq); | |
476 | __skb_queue_head_init(&l->deferdq); | |
477 | skb_queue_head_init(&l->wakeupq); | |
478 | skb_queue_head_init(l->inputq); | |
479 | return true; | |
b97bf3fd PL |
480 | } |
481 | ||
32301906 JPM |
482 | /** |
483 | * tipc_link_bc_create - create new link to be used for broadcast | |
484 | * @n: pointer to associated node | |
485 | * @mtu: mtu to be used | |
486 | * @window: send window to be used | |
487 | * @inputq: queue to put messages ready for delivery | |
488 | * @namedq: queue to put binding table update messages ready for delivery | |
489 | * @link: return value, pointer to put the created link | |
490 | * | |
491 | * Returns true if link was created, otherwise false | |
492 | */ | |
c72fa872 | 493 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, |
52666986 | 494 | int mtu, int window, u16 peer_caps, |
32301906 JPM |
495 | struct sk_buff_head *inputq, |
496 | struct sk_buff_head *namedq, | |
52666986 | 497 | struct tipc_link *bc_sndlink, |
32301906 JPM |
498 | struct tipc_link **link) |
499 | { | |
500 | struct tipc_link *l; | |
501 | ||
c72fa872 | 502 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, |
2af5ae37 | 503 | 0, ownnode, peer, peer_caps, bc_sndlink, |
52666986 | 504 | NULL, inputq, namedq, link)) |
32301906 JPM |
505 | return false; |
506 | ||
507 | l = *link; | |
508 | strcpy(l->name, tipc_bclink_name); | |
509 | tipc_link_reset(l); | |
52666986 | 510 | l->state = LINK_RESET; |
2f566124 | 511 | l->ackers = 0; |
52666986 | 512 | l->bc_rcvlink = l; |
32301906 | 513 | |
52666986 JPM |
514 | /* Broadcast send link is always up */ |
515 | if (link_is_bc_sndlink(l)) | |
516 | l->state = LINK_ESTABLISHED; | |
d999297c | 517 | |
52666986 | 518 | return true; |
d999297c JPM |
519 | } |
520 | ||
6ab30f9c JPM |
521 | /** |
522 | * tipc_link_fsm_evt - link finite state machine | |
523 | * @l: pointer to link | |
524 | * @evt: state machine event to be processed | |
6ab30f9c | 525 | */ |
662921cd | 526 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 527 | { |
5045f7b9 | 528 | int rc = 0; |
6ab30f9c JPM |
529 | |
530 | switch (l->state) { | |
662921cd | 531 | case LINK_RESETTING: |
6ab30f9c | 532 | switch (evt) { |
662921cd JPM |
533 | case LINK_PEER_RESET_EVT: |
534 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 535 | break; |
662921cd JPM |
536 | case LINK_RESET_EVT: |
537 | l->state = LINK_RESET; | |
538 | break; | |
539 | case LINK_FAILURE_EVT: | |
540 | case LINK_FAILOVER_BEGIN_EVT: | |
541 | case LINK_ESTABLISH_EVT: | |
542 | case LINK_FAILOVER_END_EVT: | |
543 | case LINK_SYNCH_BEGIN_EVT: | |
544 | case LINK_SYNCH_END_EVT: | |
545 | default: | |
546 | goto illegal_evt; | |
547 | } | |
548 | break; | |
549 | case LINK_RESET: | |
550 | switch (evt) { | |
551 | case LINK_PEER_RESET_EVT: | |
552 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 553 | break; |
662921cd JPM |
554 | case LINK_FAILOVER_BEGIN_EVT: |
555 | l->state = LINK_FAILINGOVER; | |
556 | case LINK_FAILURE_EVT: | |
557 | case LINK_RESET_EVT: | |
558 | case LINK_ESTABLISH_EVT: | |
559 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 560 | break; |
662921cd JPM |
561 | case LINK_SYNCH_BEGIN_EVT: |
562 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 563 | default: |
662921cd | 564 | goto illegal_evt; |
6ab30f9c JPM |
565 | } |
566 | break; | |
662921cd | 567 | case LINK_PEER_RESET: |
6ab30f9c | 568 | switch (evt) { |
662921cd JPM |
569 | case LINK_RESET_EVT: |
570 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 571 | break; |
662921cd JPM |
572 | case LINK_PEER_RESET_EVT: |
573 | case LINK_ESTABLISH_EVT: | |
574 | case LINK_FAILURE_EVT: | |
6ab30f9c | 575 | break; |
662921cd JPM |
576 | case LINK_SYNCH_BEGIN_EVT: |
577 | case LINK_SYNCH_END_EVT: | |
578 | case LINK_FAILOVER_BEGIN_EVT: | |
579 | case LINK_FAILOVER_END_EVT: | |
580 | default: | |
581 | goto illegal_evt; | |
582 | } | |
583 | break; | |
584 | case LINK_FAILINGOVER: | |
585 | switch (evt) { | |
586 | case LINK_FAILOVER_END_EVT: | |
587 | l->state = LINK_RESET; | |
6ab30f9c | 588 | break; |
662921cd JPM |
589 | case LINK_PEER_RESET_EVT: |
590 | case LINK_RESET_EVT: | |
591 | case LINK_ESTABLISH_EVT: | |
592 | case LINK_FAILURE_EVT: | |
593 | break; | |
594 | case LINK_FAILOVER_BEGIN_EVT: | |
595 | case LINK_SYNCH_BEGIN_EVT: | |
596 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 597 | default: |
662921cd | 598 | goto illegal_evt; |
6ab30f9c JPM |
599 | } |
600 | break; | |
662921cd | 601 | case LINK_ESTABLISHING: |
6ab30f9c | 602 | switch (evt) { |
662921cd JPM |
603 | case LINK_ESTABLISH_EVT: |
604 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 605 | break; |
662921cd JPM |
606 | case LINK_FAILOVER_BEGIN_EVT: |
607 | l->state = LINK_FAILINGOVER; | |
608 | break; | |
662921cd | 609 | case LINK_RESET_EVT: |
73f646ce JPM |
610 | l->state = LINK_RESET; |
611 | break; | |
662921cd | 612 | case LINK_FAILURE_EVT: |
73f646ce | 613 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
614 | case LINK_SYNCH_BEGIN_EVT: |
615 | case LINK_FAILOVER_END_EVT: | |
616 | break; | |
617 | case LINK_SYNCH_END_EVT: | |
618 | default: | |
619 | goto illegal_evt; | |
620 | } | |
621 | break; | |
622 | case LINK_ESTABLISHED: | |
623 | switch (evt) { | |
624 | case LINK_PEER_RESET_EVT: | |
625 | l->state = LINK_PEER_RESET; | |
626 | rc |= TIPC_LINK_DOWN_EVT; | |
627 | break; | |
628 | case LINK_FAILURE_EVT: | |
629 | l->state = LINK_RESETTING; | |
630 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 631 | break; |
662921cd JPM |
632 | case LINK_RESET_EVT: |
633 | l->state = LINK_RESET; | |
6ab30f9c | 634 | break; |
662921cd | 635 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 636 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 637 | break; |
662921cd JPM |
638 | case LINK_SYNCH_BEGIN_EVT: |
639 | l->state = LINK_SYNCHING; | |
640 | break; | |
662921cd JPM |
641 | case LINK_FAILOVER_BEGIN_EVT: |
642 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 643 | default: |
662921cd | 644 | goto illegal_evt; |
6ab30f9c JPM |
645 | } |
646 | break; | |
662921cd | 647 | case LINK_SYNCHING: |
6ab30f9c | 648 | switch (evt) { |
662921cd JPM |
649 | case LINK_PEER_RESET_EVT: |
650 | l->state = LINK_PEER_RESET; | |
651 | rc |= TIPC_LINK_DOWN_EVT; | |
652 | break; | |
653 | case LINK_FAILURE_EVT: | |
654 | l->state = LINK_RESETTING; | |
655 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 656 | break; |
662921cd JPM |
657 | case LINK_RESET_EVT: |
658 | l->state = LINK_RESET; | |
6ab30f9c | 659 | break; |
662921cd JPM |
660 | case LINK_ESTABLISH_EVT: |
661 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 662 | break; |
662921cd JPM |
663 | case LINK_SYNCH_END_EVT: |
664 | l->state = LINK_ESTABLISHED; | |
665 | break; | |
666 | case LINK_FAILOVER_BEGIN_EVT: | |
667 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 668 | default: |
662921cd | 669 | goto illegal_evt; |
6ab30f9c JPM |
670 | } |
671 | break; | |
672 | default: | |
662921cd | 673 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 674 | } |
662921cd JPM |
675 | return rc; |
676 | illegal_evt: | |
677 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
678 | evt, l->state, l->name); | |
6ab30f9c JPM |
679 | return rc; |
680 | } | |
681 | ||
333ef69e JPM |
682 | /* link_profile_stats - update statistical profiling of traffic |
683 | */ | |
684 | static void link_profile_stats(struct tipc_link *l) | |
685 | { | |
686 | struct sk_buff *skb; | |
687 | struct tipc_msg *msg; | |
688 | int length; | |
689 | ||
690 | /* Update counters used in statistical profiling of send traffic */ | |
691 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
692 | l->stats.queue_sz_counts++; | |
693 | ||
694 | skb = skb_peek(&l->transmq); | |
695 | if (!skb) | |
696 | return; | |
697 | msg = buf_msg(skb); | |
698 | length = msg_size(msg); | |
699 | ||
700 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
701 | if (msg_type(msg) != FIRST_FRAGMENT) | |
702 | return; | |
703 | length = msg_size(msg_get_wrapped(msg)); | |
704 | } | |
705 | l->stats.msg_lengths_total += length; | |
706 | l->stats.msg_length_counts++; | |
707 | if (length <= 64) | |
708 | l->stats.msg_length_profile[0]++; | |
709 | else if (length <= 256) | |
710 | l->stats.msg_length_profile[1]++; | |
711 | else if (length <= 1024) | |
712 | l->stats.msg_length_profile[2]++; | |
713 | else if (length <= 4096) | |
714 | l->stats.msg_length_profile[3]++; | |
715 | else if (length <= 16384) | |
716 | l->stats.msg_length_profile[4]++; | |
717 | else if (length <= 32768) | |
718 | l->stats.msg_length_profile[5]++; | |
719 | else | |
720 | l->stats.msg_length_profile[6]++; | |
721 | } | |
722 | ||
723 | /* tipc_link_timeout - perform periodic task as instructed from node timeout | |
724 | */ | |
725 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
726 | { | |
c91522f8 YX |
727 | int mtyp = 0; |
728 | int rc = 0; | |
42b18f60 JPM |
729 | bool state = false; |
730 | bool probe = false; | |
731 | bool setup = false; | |
52666986 JPM |
732 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
733 | u16 bc_acked = l->bc_rcvlink->acked; | |
35c55c98 | 734 | struct tipc_mon_state *mstate = &l->mon_state; |
5045f7b9 | 735 | |
662921cd JPM |
736 | switch (l->state) { |
737 | case LINK_ESTABLISHED: | |
738 | case LINK_SYNCHING: | |
42b18f60 | 739 | mtyp = STATE_MSG; |
35c55c98 JPM |
740 | link_profile_stats(l); |
741 | tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id); | |
742 | if (mstate->reset || (l->silent_intv_cnt > l->abort_limit)) | |
743 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
42b18f60 | 744 | state = bc_acked != bc_snt; |
35c55c98 JPM |
745 | state |= l->bc_rcvlink->rcv_unacked; |
746 | state |= l->rcv_unacked; | |
747 | state |= !skb_queue_empty(&l->transmq); | |
748 | state |= !skb_queue_empty(&l->deferdq); | |
749 | probe = mstate->probing; | |
750 | probe |= l->silent_intv_cnt; | |
751 | if (probe || mstate->monitoring) | |
752 | l->silent_intv_cnt++; | |
662921cd JPM |
753 | break; |
754 | case LINK_RESET: | |
42b18f60 JPM |
755 | setup = l->rst_cnt++ <= 4; |
756 | setup |= !(l->rst_cnt % 16); | |
5045f7b9 | 757 | mtyp = RESET_MSG; |
662921cd JPM |
758 | break; |
759 | case LINK_ESTABLISHING: | |
42b18f60 | 760 | setup = true; |
5045f7b9 | 761 | mtyp = ACTIVATE_MSG; |
662921cd | 762 | break; |
662921cd | 763 | case LINK_PEER_RESET: |
598411d7 | 764 | case LINK_RESETTING: |
662921cd JPM |
765 | case LINK_FAILINGOVER: |
766 | break; | |
767 | default: | |
768 | break; | |
5045f7b9 | 769 | } |
662921cd | 770 | |
42b18f60 JPM |
771 | if (state || probe || setup) |
772 | tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, xmitq); | |
5045f7b9 | 773 | |
333ef69e JPM |
774 | return rc; |
775 | } | |
776 | ||
b97bf3fd | 777 | /** |
3127a020 | 778 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 779 | * @link: congested link |
3127a020 | 780 | * @list: message that was attempted sent |
50100a5e | 781 | * Create pseudo msg to send back to user when congestion abates |
22d85c79 | 782 | * Does not consume buffer list |
b97bf3fd | 783 | */ |
3127a020 | 784 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 785 | { |
3127a020 JPM |
786 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
787 | int imp = msg_importance(msg); | |
788 | u32 oport = msg_origport(msg); | |
e74a386d | 789 | u32 addr = tipc_own_addr(link->net); |
3127a020 JPM |
790 | struct sk_buff *skb; |
791 | ||
792 | /* This really cannot happen... */ | |
793 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
794 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
22d85c79 | 795 | return -ENOBUFS; |
3127a020 JPM |
796 | } |
797 | /* Non-blocking sender: */ | |
798 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
799 | return -ELINKCONG; | |
800 | ||
801 | /* Create and schedule wakeup pseudo message */ | |
802 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
803 | addr, addr, oport, 0, 0); | |
804 | if (!skb) | |
22d85c79 | 805 | return -ENOBUFS; |
3127a020 JPM |
806 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); |
807 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
808 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 809 | link->stats.link_congs++; |
3127a020 | 810 | return -ELINKCONG; |
b97bf3fd PL |
811 | } |
812 | ||
50100a5e JPM |
813 | /** |
814 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
815 | * @link: congested link | |
816 | * Move a number of waiting users, as permitted by available space in | |
817 | * the send queue, from link wait queue to node wait queue for wakeup | |
818 | */ | |
1f66d161 | 819 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 820 | { |
1f66d161 JPM |
821 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
822 | int imp, lim; | |
58d78b32 | 823 | struct sk_buff *skb, *tmp; |
50100a5e | 824 | |
1f66d161 JPM |
825 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
826 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
5a0950c2 | 827 | lim = l->backlog[imp].limit; |
1f66d161 JPM |
828 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; |
829 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 830 | break; |
1f66d161 | 831 | skb_unlink(skb, &l->wakeupq); |
d39bbd44 | 832 | skb_queue_tail(l->inputq, skb); |
b97bf3fd | 833 | } |
b97bf3fd PL |
834 | } |
835 | ||
6e498158 | 836 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 837 | { |
e74a386d JPM |
838 | l->peer_session = ANY_SESSION; |
839 | l->session++; | |
6e498158 | 840 | l->mtu = l->advertised_mtu; |
6e498158 JPM |
841 | __skb_queue_purge(&l->transmq); |
842 | __skb_queue_purge(&l->deferdq); | |
23d8335d | 843 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
2af5ae37 JPM |
844 | __skb_queue_purge(&l->backlogq); |
845 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
846 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
847 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
848 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
849 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
6e498158 JPM |
850 | kfree_skb(l->reasm_buf); |
851 | kfree_skb(l->failover_reasm_skb); | |
852 | l->reasm_buf = NULL; | |
853 | l->failover_reasm_skb = NULL; | |
854 | l->rcv_unacked = 0; | |
855 | l->snd_nxt = 1; | |
856 | l->rcv_nxt = 1; | |
c1ab3f1d | 857 | l->acked = 0; |
6e498158 | 858 | l->silent_intv_cnt = 0; |
88e8ac70 | 859 | l->rst_cnt = 0; |
6e498158 JPM |
860 | l->stats.recv_info = 0; |
861 | l->stale_count = 0; | |
52666986 | 862 | l->bc_peer_is_up = false; |
35c55c98 | 863 | memset(&l->mon_state, 0, sizeof(l->mon_state)); |
38206d59 | 864 | tipc_link_reset_stats(l); |
b97bf3fd PL |
865 | } |
866 | ||
af9b028e JPM |
867 | /** |
868 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
869 | * @link: link to use | |
870 | * @list: chain of buffers containing message | |
871 | * @xmitq: returned list of packets to be sent by caller | |
872 | * | |
873 | * Consumes the buffer chain, except when returning -ELINKCONG, | |
874 | * since the caller then may want to make more send attempts. | |
875 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
876 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
877 | */ | |
878 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
879 | struct sk_buff_head *xmitq) | |
880 | { | |
881 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
882 | unsigned int maxwin = l->window; | |
883 | unsigned int i, imp = msg_importance(hdr); | |
884 | unsigned int mtu = l->mtu; | |
885 | u16 ack = l->rcv_nxt - 1; | |
886 | u16 seqno = l->snd_nxt; | |
52666986 | 887 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
af9b028e JPM |
888 | struct sk_buff_head *transmq = &l->transmq; |
889 | struct sk_buff_head *backlogq = &l->backlogq; | |
890 | struct sk_buff *skb, *_skb, *bskb; | |
891 | ||
892 | /* Match msg importance against this and all higher backlog limits: */ | |
5a0950c2 JPM |
893 | if (!skb_queue_empty(backlogq)) { |
894 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
895 | if (unlikely(l->backlog[i].len >= l->backlog[i].limit)) | |
896 | return link_schedule_user(l, list); | |
897 | } | |
af9b028e | 898 | } |
4952cd3e RA |
899 | if (unlikely(msg_size(hdr) > mtu)) { |
900 | skb_queue_purge(list); | |
af9b028e | 901 | return -EMSGSIZE; |
4952cd3e | 902 | } |
af9b028e JPM |
903 | |
904 | /* Prepare each packet for sending, and add to relevant queue: */ | |
905 | while (skb_queue_len(list)) { | |
906 | skb = skb_peek(list); | |
907 | hdr = buf_msg(skb); | |
908 | msg_set_seqno(hdr, seqno); | |
909 | msg_set_ack(hdr, ack); | |
52666986 | 910 | msg_set_bcast_ack(hdr, bc_ack); |
af9b028e JPM |
911 | |
912 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
913 | _skb = skb_clone(skb, GFP_ATOMIC); | |
4952cd3e RA |
914 | if (!_skb) { |
915 | skb_queue_purge(list); | |
af9b028e | 916 | return -ENOBUFS; |
4952cd3e | 917 | } |
af9b028e JPM |
918 | __skb_dequeue(list); |
919 | __skb_queue_tail(transmq, skb); | |
920 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 921 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e JPM |
922 | l->rcv_unacked = 0; |
923 | seqno++; | |
924 | continue; | |
925 | } | |
926 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { | |
927 | kfree_skb(__skb_dequeue(list)); | |
928 | l->stats.sent_bundled++; | |
929 | continue; | |
930 | } | |
931 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { | |
932 | kfree_skb(__skb_dequeue(list)); | |
933 | __skb_queue_tail(backlogq, bskb); | |
934 | l->backlog[msg_importance(buf_msg(bskb))].len++; | |
935 | l->stats.sent_bundled++; | |
936 | l->stats.sent_bundles++; | |
937 | continue; | |
938 | } | |
939 | l->backlog[imp].len += skb_queue_len(list); | |
940 | skb_queue_splice_tail_init(list, backlogq); | |
941 | } | |
942 | l->snd_nxt = seqno; | |
943 | return 0; | |
944 | } | |
945 | ||
d999297c JPM |
946 | void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) |
947 | { | |
948 | struct sk_buff *skb, *_skb; | |
949 | struct tipc_msg *hdr; | |
950 | u16 seqno = l->snd_nxt; | |
951 | u16 ack = l->rcv_nxt - 1; | |
52666986 | 952 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
953 | |
954 | while (skb_queue_len(&l->transmq) < l->window) { | |
955 | skb = skb_peek(&l->backlogq); | |
956 | if (!skb) | |
957 | break; | |
958 | _skb = skb_clone(skb, GFP_ATOMIC); | |
959 | if (!_skb) | |
960 | break; | |
961 | __skb_dequeue(&l->backlogq); | |
962 | hdr = buf_msg(skb); | |
963 | l->backlog[msg_importance(hdr)].len--; | |
964 | __skb_queue_tail(&l->transmq, skb); | |
965 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 966 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 967 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
968 | msg_set_ack(hdr, ack); |
969 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
970 | l->rcv_unacked = 0; |
971 | seqno++; | |
972 | } | |
973 | l->snd_nxt = seqno; | |
974 | } | |
975 | ||
52666986 | 976 | static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb) |
d356eeba | 977 | { |
52666986 JPM |
978 | struct tipc_msg *hdr = buf_msg(skb); |
979 | ||
980 | pr_warn("Retransmission failure on link <%s>\n", l->name); | |
981 | link_print(l, "Resetting link "); | |
982 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
983 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
984 | pr_info("sqno %u, prev: %x, src: %x\n", | |
985 | msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr)); | |
d356eeba AS |
986 | } |
987 | ||
c1ab3f1d JPM |
988 | int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to, |
989 | struct sk_buff_head *xmitq) | |
d999297c JPM |
990 | { |
991 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
992 | struct tipc_msg *hdr; | |
c1ab3f1d | 993 | u16 ack = l->rcv_nxt - 1; |
52666986 | 994 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
995 | |
996 | if (!skb) | |
997 | return 0; | |
998 | ||
999 | /* Detect repeated retransmit failures on same packet */ | |
1000 | if (likely(l->last_retransm != buf_seqno(skb))) { | |
1001 | l->last_retransm = buf_seqno(skb); | |
1002 | l->stale_count = 1; | |
1003 | } else if (++l->stale_count > 100) { | |
1004 | link_retransmit_failure(l, skb); | |
662921cd | 1005 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
d999297c | 1006 | } |
c1ab3f1d JPM |
1007 | |
1008 | /* Move forward to where retransmission should start */ | |
d999297c | 1009 | skb_queue_walk(&l->transmq, skb) { |
c1ab3f1d JPM |
1010 | if (!less(buf_seqno(skb), from)) |
1011 | break; | |
1012 | } | |
1013 | ||
1014 | skb_queue_walk_from(&l->transmq, skb) { | |
1015 | if (more(buf_seqno(skb), to)) | |
1016 | break; | |
d999297c JPM |
1017 | hdr = buf_msg(skb); |
1018 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); | |
1019 | if (!_skb) | |
1020 | return 0; | |
1021 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
1022 | msg_set_ack(hdr, ack); |
1023 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
1024 | _skb->priority = TC_PRIO_CONTROL; |
1025 | __skb_queue_tail(xmitq, _skb); | |
d999297c JPM |
1026 | l->stats.retransmitted++; |
1027 | } | |
1028 | return 0; | |
1029 | } | |
1030 | ||
c637c103 | 1031 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1032 | * |
c637c103 | 1033 | * Consumes buffer if message is of right type |
7ae934be EH |
1034 | * Node lock must be held |
1035 | */ | |
52666986 | 1036 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 1037 | struct sk_buff_head *inputq) |
7ae934be | 1038 | { |
9073fb8b | 1039 | switch (msg_user(buf_msg(skb))) { |
c637c103 JPM |
1040 | case TIPC_LOW_IMPORTANCE: |
1041 | case TIPC_MEDIUM_IMPORTANCE: | |
1042 | case TIPC_HIGH_IMPORTANCE: | |
1043 | case TIPC_CRITICAL_IMPORTANCE: | |
1044 | case CONN_MANAGER: | |
9945e804 | 1045 | skb_queue_tail(inputq, skb); |
c637c103 | 1046 | return true; |
7ae934be | 1047 | case NAME_DISTRIBUTOR: |
52666986 JPM |
1048 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
1049 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
1050 | return true; |
1051 | case MSG_BUNDLER: | |
dff29b1a | 1052 | case TUNNEL_PROTOCOL: |
c637c103 | 1053 | case MSG_FRAGMENTER: |
7ae934be | 1054 | case BCAST_PROTOCOL: |
c637c103 | 1055 | return false; |
7ae934be | 1056 | default: |
c637c103 JPM |
1057 | pr_warn("Dropping received illegal msg type\n"); |
1058 | kfree_skb(skb); | |
1059 | return false; | |
1060 | }; | |
7ae934be | 1061 | } |
c637c103 JPM |
1062 | |
1063 | /* tipc_link_input - process packet that has passed link protocol check | |
1064 | * | |
1065 | * Consumes buffer | |
7ae934be | 1066 | */ |
9073fb8b JPM |
1067 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
1068 | struct sk_buff_head *inputq) | |
7ae934be | 1069 | { |
6e498158 JPM |
1070 | struct tipc_msg *hdr = buf_msg(skb); |
1071 | struct sk_buff **reasm_skb = &l->reasm_buf; | |
c637c103 | 1072 | struct sk_buff *iskb; |
9945e804 | 1073 | struct sk_buff_head tmpq; |
6e498158 | 1074 | int usr = msg_user(hdr); |
6144a996 | 1075 | int rc = 0; |
6e498158 JPM |
1076 | int pos = 0; |
1077 | int ipos = 0; | |
c637c103 | 1078 | |
6e498158 JPM |
1079 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
1080 | if (msg_type(hdr) == SYNCH_MSG) { | |
1081 | __skb_queue_purge(&l->deferdq); | |
1082 | goto drop; | |
8b4ed863 | 1083 | } |
6e498158 JPM |
1084 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
1085 | return rc; | |
1086 | kfree_skb(skb); | |
1087 | skb = iskb; | |
1088 | hdr = buf_msg(skb); | |
1089 | if (less(msg_seqno(hdr), l->drop_point)) | |
1090 | goto drop; | |
9073fb8b | 1091 | if (tipc_data_input(l, skb, inputq)) |
6e498158 JPM |
1092 | return rc; |
1093 | usr = msg_user(hdr); | |
1094 | reasm_skb = &l->failover_reasm_skb; | |
1095 | } | |
c637c103 | 1096 | |
6e498158 | 1097 | if (usr == MSG_BUNDLER) { |
9945e804 | 1098 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1099 | l->stats.recv_bundles++; |
1100 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1101 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1102 | tipc_data_input(l, iskb, &tmpq); |
1103 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1104 | return 0; |
6e498158 JPM |
1105 | } else if (usr == MSG_FRAGMENTER) { |
1106 | l->stats.recv_fragments++; | |
1107 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1108 | l->stats.recv_fragmented++; | |
9073fb8b | 1109 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
1110 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
1111 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 1112 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1113 | } |
662921cd | 1114 | return 0; |
6e498158 | 1115 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 1116 | tipc_bcast_lock(l->net); |
52666986 | 1117 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 1118 | tipc_bcast_unlock(l->net); |
6e498158 JPM |
1119 | } |
1120 | drop: | |
1121 | kfree_skb(skb); | |
662921cd | 1122 | return 0; |
7ae934be EH |
1123 | } |
1124 | ||
d999297c JPM |
1125 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
1126 | { | |
1127 | bool released = false; | |
1128 | struct sk_buff *skb, *tmp; | |
1129 | ||
1130 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
1131 | if (more(buf_seqno(skb), acked)) | |
1132 | break; | |
1133 | __skb_unlink(skb, &l->transmq); | |
1134 | kfree_skb(skb); | |
1135 | released = true; | |
1136 | } | |
1137 | return released; | |
1138 | } | |
1139 | ||
34b9cd64 | 1140 | /* tipc_link_build_state_msg: prepare link state message for transmission |
52666986 JPM |
1141 | * |
1142 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
1143 | * risk of ack storms towards the sender | |
f9aa358a | 1144 | */ |
34b9cd64 | 1145 | int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 1146 | { |
52666986 JPM |
1147 | if (!l) |
1148 | return 0; | |
1149 | ||
1150 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
1151 | if (link_is_bc_rcvlink(l)) { | |
e74a386d | 1152 | if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) |
52666986 JPM |
1153 | return 0; |
1154 | l->rcv_unacked = 0; | |
02d11ca2 JPM |
1155 | |
1156 | /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */ | |
1157 | l->snd_nxt = l->rcv_nxt; | |
1158 | return TIPC_LINK_SND_STATE; | |
52666986 JPM |
1159 | } |
1160 | ||
1161 | /* Unicast ACK */ | |
f9aa358a JPM |
1162 | l->rcv_unacked = 0; |
1163 | l->stats.sent_acks++; | |
1164 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
52666986 | 1165 | return 0; |
f9aa358a JPM |
1166 | } |
1167 | ||
282b3a05 JPM |
1168 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1169 | */ | |
1170 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1171 | { | |
1172 | int mtyp = RESET_MSG; | |
634696b1 | 1173 | struct sk_buff *skb; |
282b3a05 JPM |
1174 | |
1175 | if (l->state == LINK_ESTABLISHING) | |
1176 | mtyp = ACTIVATE_MSG; | |
1177 | ||
1178 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq); | |
634696b1 JPM |
1179 | |
1180 | /* Inform peer that this endpoint is going down if applicable */ | |
1181 | skb = skb_peek_tail(xmitq); | |
1182 | if (skb && (l->state == LINK_RESET)) | |
1183 | msg_set_peer_stopping(buf_msg(skb), 1); | |
282b3a05 JPM |
1184 | } |
1185 | ||
f9aa358a JPM |
1186 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
1187 | */ | |
1188 | static void tipc_link_build_nack_msg(struct tipc_link *l, | |
1189 | struct sk_buff_head *xmitq) | |
1190 | { | |
1191 | u32 def_cnt = ++l->stats.deferred_recv; | |
1192 | ||
52666986 JPM |
1193 | if (link_is_bc_rcvlink(l)) |
1194 | return; | |
1195 | ||
f9aa358a JPM |
1196 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) |
1197 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
1198 | } | |
1199 | ||
d999297c | 1200 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1201 | * @l: the link that should handle the message |
d999297c JPM |
1202 | * @skb: TIPC packet |
1203 | * @xmitq: queue to place packets to be sent after this call | |
1204 | */ | |
1205 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1206 | struct sk_buff_head *xmitq) | |
1207 | { | |
f9aa358a | 1208 | struct sk_buff_head *defq = &l->deferdq; |
d999297c | 1209 | struct tipc_msg *hdr; |
81204c49 | 1210 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1211 | int rc = 0; |
1212 | ||
f9aa358a | 1213 | do { |
d999297c | 1214 | hdr = buf_msg(skb); |
f9aa358a JPM |
1215 | seqno = msg_seqno(hdr); |
1216 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1217 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c JPM |
1218 | |
1219 | /* Verify and update link state */ | |
f9aa358a JPM |
1220 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
1221 | return tipc_link_proto_rcv(l, skb, xmitq); | |
d999297c | 1222 | |
662921cd | 1223 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1224 | if (l->state == LINK_ESTABLISHING) |
1225 | rc = TIPC_LINK_UP_EVT; | |
1226 | goto drop; | |
d999297c JPM |
1227 | } |
1228 | ||
f9aa358a | 1229 | /* Don't send probe at next timeout expiration */ |
d999297c JPM |
1230 | l->silent_intv_cnt = 0; |
1231 | ||
81204c49 JPM |
1232 | /* Drop if outside receive window */ |
1233 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1234 | l->stats.duplicates++; | |
1235 | goto drop; | |
1236 | } | |
1237 | ||
d999297c JPM |
1238 | /* Forward queues and wake up waiting users */ |
1239 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1240 | tipc_link_advance_backlog(l, xmitq); | |
1241 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1242 | link_prepare_wakeup(l); | |
1243 | } | |
1244 | ||
81204c49 JPM |
1245 | /* Defer delivery if sequence gap */ |
1246 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1247 | __tipc_skb_queue_sorted(defq, seqno, skb); |
f9aa358a JPM |
1248 | tipc_link_build_nack_msg(l, xmitq); |
1249 | break; | |
d999297c JPM |
1250 | } |
1251 | ||
81204c49 | 1252 | /* Deliver packet */ |
d999297c JPM |
1253 | l->rcv_nxt++; |
1254 | l->stats.recv_info++; | |
f9aa358a | 1255 | if (!tipc_data_input(l, skb, l->inputq)) |
52666986 | 1256 | rc |= tipc_link_input(l, skb, l->inputq); |
f9aa358a | 1257 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
34b9cd64 | 1258 | rc |= tipc_link_build_state_msg(l, xmitq); |
02d11ca2 | 1259 | if (unlikely(rc & ~TIPC_LINK_SND_STATE)) |
52666986 | 1260 | break; |
f9aa358a JPM |
1261 | } while ((skb = __skb_dequeue(defq))); |
1262 | ||
1263 | return rc; | |
1264 | drop: | |
1265 | kfree_skb(skb); | |
d999297c JPM |
1266 | return rc; |
1267 | } | |
1268 | ||
426cc2b8 JPM |
1269 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
1270 | u16 rcvgap, int tolerance, int priority, | |
1271 | struct sk_buff_head *xmitq) | |
1272 | { | |
02d11ca2 | 1273 | struct tipc_link *bcl = l->bc_rcvlink; |
e74a386d JPM |
1274 | struct sk_buff *skb; |
1275 | struct tipc_msg *hdr; | |
1276 | struct sk_buff_head *dfq = &l->deferdq; | |
02d11ca2 | 1277 | bool node_up = link_is_up(bcl); |
35c55c98 JPM |
1278 | struct tipc_mon_state *mstate = &l->mon_state; |
1279 | int dlen = 0; | |
1280 | void *data; | |
426cc2b8 JPM |
1281 | |
1282 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1283 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1284 | return; |
1285 | ||
e74a386d JPM |
1286 | if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) |
1287 | return; | |
1288 | ||
1289 | if (!skb_queue_empty(dfq)) | |
1290 | rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; | |
1291 | ||
1292 | skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, | |
35c55c98 | 1293 | tipc_max_domain_size, l->addr, |
e74a386d JPM |
1294 | tipc_own_addr(l->net), 0, 0, 0); |
1295 | if (!skb) | |
1296 | return; | |
1297 | ||
1298 | hdr = buf_msg(skb); | |
35c55c98 | 1299 | data = msg_data(hdr); |
e74a386d JPM |
1300 | msg_set_session(hdr, l->session); |
1301 | msg_set_bearer_id(hdr, l->bearer_id); | |
426cc2b8 | 1302 | msg_set_net_plane(hdr, l->net_plane); |
52666986 JPM |
1303 | msg_set_next_sent(hdr, l->snd_nxt); |
1304 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
02d11ca2 | 1305 | msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); |
52666986 | 1306 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); |
426cc2b8 JPM |
1307 | msg_set_link_tolerance(hdr, tolerance); |
1308 | msg_set_linkprio(hdr, priority); | |
1309 | msg_set_redundant_link(hdr, node_up); | |
1310 | msg_set_seq_gap(hdr, 0); | |
52666986 | 1311 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1312 | |
1313 | if (mtyp == STATE_MSG) { | |
e74a386d | 1314 | msg_set_seq_gap(hdr, rcvgap); |
02d11ca2 | 1315 | msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl)); |
426cc2b8 | 1316 | msg_set_probe(hdr, probe); |
35c55c98 JPM |
1317 | tipc_mon_prep(l->net, data, &dlen, mstate, l->bearer_id); |
1318 | msg_set_size(hdr, INT_H_SIZE + dlen); | |
1319 | skb_trim(skb, INT_H_SIZE + dlen); | |
426cc2b8 | 1320 | l->stats.sent_states++; |
52666986 | 1321 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1322 | } else { |
1323 | /* RESET_MSG or ACTIVATE_MSG */ | |
1324 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
35c55c98 JPM |
1325 | strcpy(data, l->if_name); |
1326 | msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
1327 | skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
426cc2b8 | 1328 | } |
e74a386d JPM |
1329 | if (probe) |
1330 | l->stats.sent_probes++; | |
1331 | if (rcvgap) | |
1332 | l->stats.sent_nacks++; | |
426cc2b8 | 1333 | skb->priority = TC_PRIO_CONTROL; |
6e498158 | 1334 | __skb_queue_tail(xmitq, skb); |
b97bf3fd PL |
1335 | } |
1336 | ||
6e498158 | 1337 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1338 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1339 | */ |
6e498158 JPM |
1340 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1341 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1342 | { |
6e498158 JPM |
1343 | struct sk_buff *skb, *tnlskb; |
1344 | struct tipc_msg *hdr, tnlhdr; | |
1345 | struct sk_buff_head *queue = &l->transmq; | |
1346 | struct sk_buff_head tmpxq, tnlq; | |
1347 | u16 pktlen, pktcnt, seqno = l->snd_nxt; | |
b97bf3fd | 1348 | |
6e498158 | 1349 | if (!tnl) |
b97bf3fd PL |
1350 | return; |
1351 | ||
6e498158 JPM |
1352 | skb_queue_head_init(&tnlq); |
1353 | skb_queue_head_init(&tmpxq); | |
dd3f9e70 | 1354 | |
6e498158 JPM |
1355 | /* At least one packet required for safe algorithm => add dummy */ |
1356 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
e74a386d | 1357 | BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net), |
6e498158 JPM |
1358 | 0, 0, TIPC_ERR_NO_PORT); |
1359 | if (!skb) { | |
1360 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
b97bf3fd PL |
1361 | return; |
1362 | } | |
6e498158 JPM |
1363 | skb_queue_tail(&tnlq, skb); |
1364 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1365 | __skb_queue_purge(&tmpxq); | |
1366 | ||
1367 | /* Initialize reusable tunnel packet header */ | |
e74a386d | 1368 | tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, |
6e498158 JPM |
1369 | mtyp, INT_H_SIZE, l->addr); |
1370 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); | |
1371 | msg_set_msgcnt(&tnlhdr, pktcnt); | |
1372 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1373 | tnl: | |
1374 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1375 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1376 | hdr = buf_msg(skb); |
1377 | if (queue == &l->backlogq) | |
1378 | msg_set_seqno(hdr, seqno++); | |
1379 | pktlen = msg_size(hdr); | |
1380 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); | |
1381 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE); | |
1382 | if (!tnlskb) { | |
1383 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1384 | return; |
1385 | } | |
6e498158 JPM |
1386 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1387 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1388 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1389 | } |
6e498158 JPM |
1390 | if (queue != &l->backlogq) { |
1391 | queue = &l->backlogq; | |
1392 | goto tnl; | |
f006c9c7 | 1393 | } |
1dab3d5a | 1394 | |
6e498158 | 1395 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1396 | |
6e498158 JPM |
1397 | if (mtyp == FAILOVER_MSG) { |
1398 | tnl->drop_point = l->rcv_nxt; | |
1399 | tnl->failover_reasm_skb = l->reasm_buf; | |
1400 | l->reasm_buf = NULL; | |
2da71425 | 1401 | } |
b97bf3fd PL |
1402 | } |
1403 | ||
d999297c JPM |
1404 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1405 | * Note that network plane id propagates through the network, and may | |
1406 | * change at any time. The node with lowest numerical id determines | |
1407 | * network plane | |
1408 | */ | |
1409 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1410 | struct sk_buff_head *xmitq) | |
1411 | { | |
1412 | struct tipc_msg *hdr = buf_msg(skb); | |
1413 | u16 rcvgap = 0; | |
c1ab3f1d JPM |
1414 | u16 ack = msg_ack(hdr); |
1415 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1416 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1417 | u16 peers_tol = msg_link_tolerance(hdr); | |
1418 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1419 | u16 rcv_nxt = l->rcv_nxt; |
35c55c98 | 1420 | u16 dlen = msg_data_sz(hdr); |
73f646ce | 1421 | int mtyp = msg_type(hdr); |
35c55c98 | 1422 | void *data; |
d999297c JPM |
1423 | char *if_name; |
1424 | int rc = 0; | |
1425 | ||
52666986 | 1426 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
1427 | goto exit; |
1428 | ||
e74a386d | 1429 | if (tipc_own_addr(l->net) > msg_prevnode(hdr)) |
d999297c JPM |
1430 | l->net_plane = msg_net_plane(hdr); |
1431 | ||
35c55c98 JPM |
1432 | skb_linearize(skb); |
1433 | hdr = buf_msg(skb); | |
1434 | data = msg_data(hdr); | |
1435 | ||
73f646ce | 1436 | switch (mtyp) { |
d999297c JPM |
1437 | case RESET_MSG: |
1438 | ||
1439 | /* Ignore duplicate RESET with old session number */ | |
1440 | if ((less_eq(msg_session(hdr), l->peer_session)) && | |
e74a386d | 1441 | (l->peer_session != ANY_SESSION)) |
d999297c JPM |
1442 | break; |
1443 | /* fall thru' */ | |
662921cd | 1444 | |
d999297c JPM |
1445 | case ACTIVATE_MSG: |
1446 | ||
1447 | /* Complete own link name with peer's interface name */ | |
1448 | if_name = strrchr(l->name, ':') + 1; | |
1449 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1450 | break; | |
1451 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1452 | break; | |
35c55c98 | 1453 | strncpy(if_name, data, TIPC_MAX_IF_NAME); |
d999297c JPM |
1454 | |
1455 | /* Update own tolerance if peer indicates a non-zero value */ | |
1456 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1457 | l->tolerance = peers_tol; | |
1458 | ||
1459 | /* Update own priority if peer's priority is higher */ | |
1460 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1461 | l->priority = peers_prio; | |
1462 | ||
73f646ce | 1463 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
634696b1 JPM |
1464 | if (msg_peer_stopping(hdr)) |
1465 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1466 | else if ((mtyp == RESET_MSG) || !link_is_up(l)) | |
73f646ce JPM |
1467 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); |
1468 | ||
1469 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
1470 | if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING)) | |
1471 | rc = TIPC_LINK_UP_EVT; | |
1472 | ||
d999297c JPM |
1473 | l->peer_session = msg_session(hdr); |
1474 | l->peer_bearer_id = msg_bearer_id(hdr); | |
d999297c JPM |
1475 | if (l->mtu > msg_max_pkt(hdr)) |
1476 | l->mtu = msg_max_pkt(hdr); | |
1477 | break; | |
662921cd | 1478 | |
d999297c | 1479 | case STATE_MSG: |
662921cd | 1480 | |
d999297c JPM |
1481 | /* Update own tolerance if peer indicates a non-zero value */ |
1482 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1483 | l->tolerance = peers_tol; | |
1484 | ||
81729810 RA |
1485 | if (peers_prio && in_range(peers_prio, TIPC_MIN_LINK_PRI, |
1486 | TIPC_MAX_LINK_PRI)) { | |
1487 | l->priority = peers_prio; | |
1488 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1489 | } | |
1490 | ||
d999297c JPM |
1491 | l->silent_intv_cnt = 0; |
1492 | l->stats.recv_states++; | |
1493 | if (msg_probe(hdr)) | |
1494 | l->stats.recv_probes++; | |
73f646ce JPM |
1495 | |
1496 | if (!link_is_up(l)) { | |
1497 | if (l->state == LINK_ESTABLISHING) | |
1498 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 1499 | break; |
73f646ce | 1500 | } |
35c55c98 JPM |
1501 | tipc_mon_rcv(l->net, data, dlen, l->addr, |
1502 | &l->mon_state, l->bearer_id); | |
d999297c | 1503 | |
662921cd | 1504 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 1505 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c JPM |
1506 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
1507 | if (rcvgap || (msg_probe(hdr))) | |
1508 | tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap, | |
16040894 | 1509 | 0, 0, xmitq); |
c1ab3f1d | 1510 | tipc_link_release_pkts(l, ack); |
d999297c JPM |
1511 | |
1512 | /* If NACK, retransmit will now start at right position */ | |
c1ab3f1d JPM |
1513 | if (gap) { |
1514 | rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq); | |
d999297c JPM |
1515 | l->stats.recv_nacks++; |
1516 | } | |
662921cd | 1517 | |
d999297c JPM |
1518 | tipc_link_advance_backlog(l, xmitq); |
1519 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1520 | link_prepare_wakeup(l); | |
1521 | } | |
1522 | exit: | |
1523 | kfree_skb(skb); | |
1524 | return rc; | |
1525 | } | |
1526 | ||
52666986 JPM |
1527 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
1528 | */ | |
1529 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
1530 | u16 peers_snd_nxt, | |
1531 | struct sk_buff_head *xmitq) | |
1532 | { | |
1533 | struct sk_buff *skb; | |
1534 | struct tipc_msg *hdr; | |
1535 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
1536 | u16 ack = l->rcv_nxt - 1; | |
1537 | u16 gap_to = peers_snd_nxt - 1; | |
1538 | ||
1539 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
e74a386d | 1540 | 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); |
52666986 JPM |
1541 | if (!skb) |
1542 | return false; | |
1543 | hdr = buf_msg(skb); | |
1544 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
1545 | msg_set_bcast_ack(hdr, ack); | |
1546 | msg_set_bcgap_after(hdr, ack); | |
1547 | if (dfrd_skb) | |
1548 | gap_to = buf_seqno(dfrd_skb) - 1; | |
1549 | msg_set_bcgap_to(hdr, gap_to); | |
1550 | msg_set_non_seq(hdr, bcast); | |
1551 | __skb_queue_tail(xmitq, skb); | |
1552 | return true; | |
1553 | } | |
1554 | ||
1555 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
1556 | * | |
1557 | * Give a newly added peer node the sequence number where it should | |
1558 | * start receiving and acking broadcast packets. | |
1559 | */ | |
742e0383 WF |
1560 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
1561 | struct sk_buff_head *xmitq) | |
52666986 JPM |
1562 | { |
1563 | struct sk_buff_head list; | |
1564 | ||
1565 | __skb_queue_head_init(&list); | |
1566 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
1567 | return; | |
1568 | tipc_link_xmit(l, &list, xmitq); | |
1569 | } | |
1570 | ||
1571 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
1572 | */ | |
1573 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
1574 | { | |
1575 | int mtyp = msg_type(hdr); | |
1576 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1577 | ||
1578 | if (link_is_up(l)) | |
1579 | return; | |
1580 | ||
1581 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
1582 | l->rcv_nxt = peers_snd_nxt; | |
1583 | l->state = LINK_ESTABLISHED; | |
1584 | return; | |
1585 | } | |
1586 | ||
1587 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
1588 | return; | |
1589 | ||
1590 | if (msg_peer_node_is_up(hdr)) | |
1591 | return; | |
1592 | ||
1593 | /* Compatibility: accept older, less safe initial synch data */ | |
1594 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
1595 | l->rcv_nxt = peers_snd_nxt; | |
1596 | } | |
1597 | ||
7c4a54b9 JPM |
1598 | /* link_bc_retr eval()- check if the indicated range can be retransmitted now |
1599 | * - Adjust permitted range if there is overlap with previous retransmission | |
1600 | */ | |
1601 | static bool link_bc_retr_eval(struct tipc_link *l, u16 *from, u16 *to) | |
1602 | { | |
1603 | unsigned long elapsed = jiffies_to_msecs(jiffies - l->prev_retr); | |
1604 | ||
1605 | if (less(*to, *from)) | |
1606 | return false; | |
1607 | ||
1608 | /* New retransmission request */ | |
1609 | if ((elapsed > TIPC_BC_RETR_LIMIT) || | |
1610 | less(*to, l->prev_from) || more(*from, l->prev_to)) { | |
1611 | l->prev_from = *from; | |
1612 | l->prev_to = *to; | |
1613 | l->prev_retr = jiffies; | |
1614 | return true; | |
1615 | } | |
1616 | ||
1617 | /* Inside range of previous retransmit */ | |
1618 | if (!less(*from, l->prev_from) && !more(*to, l->prev_to)) | |
1619 | return false; | |
1620 | ||
1621 | /* Fully or partially outside previous range => exclude overlap */ | |
1622 | if (less(*from, l->prev_from)) { | |
1623 | *to = l->prev_from - 1; | |
1624 | l->prev_from = *from; | |
1625 | } | |
1626 | if (more(*to, l->prev_to)) { | |
1627 | *from = l->prev_to + 1; | |
1628 | l->prev_to = *to; | |
1629 | } | |
1630 | l->prev_retr = jiffies; | |
1631 | return true; | |
1632 | } | |
1633 | ||
52666986 JPM |
1634 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state |
1635 | */ | |
02d11ca2 JPM |
1636 | int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, |
1637 | struct sk_buff_head *xmitq) | |
52666986 | 1638 | { |
7c4a54b9 | 1639 | struct tipc_link *snd_l = l->bc_sndlink; |
52666986 | 1640 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); |
02d11ca2 JPM |
1641 | u16 from = msg_bcast_ack(hdr) + 1; |
1642 | u16 to = from + msg_bc_gap(hdr) - 1; | |
1643 | int rc = 0; | |
52666986 JPM |
1644 | |
1645 | if (!link_is_up(l)) | |
02d11ca2 | 1646 | return rc; |
52666986 JPM |
1647 | |
1648 | if (!msg_peer_node_is_up(hdr)) | |
02d11ca2 | 1649 | return rc; |
52666986 | 1650 | |
2d18ac4b JPM |
1651 | /* Open when peer ackowledges our bcast init msg (pkt #1) */ |
1652 | if (msg_ack(hdr)) | |
1653 | l->bc_peer_is_up = true; | |
1654 | ||
1655 | if (!l->bc_peer_is_up) | |
02d11ca2 | 1656 | return rc; |
52666986 | 1657 | |
7c4a54b9 JPM |
1658 | l->stats.recv_nacks++; |
1659 | ||
52666986 JPM |
1660 | /* Ignore if peers_snd_nxt goes beyond receive window */ |
1661 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
02d11ca2 JPM |
1662 | return rc; |
1663 | ||
7c4a54b9 JPM |
1664 | if (link_bc_retr_eval(snd_l, &from, &to)) |
1665 | rc = tipc_link_retrans(snd_l, from, to, xmitq); | |
02d11ca2 JPM |
1666 | |
1667 | l->snd_nxt = peers_snd_nxt; | |
1668 | if (link_bc_rcv_gap(l)) | |
1669 | rc |= TIPC_LINK_SND_STATE; | |
1670 | ||
1671 | /* Return now if sender supports nack via STATE messages */ | |
1672 | if (l->peer_caps & TIPC_BCAST_STATE_NACK) | |
1673 | return rc; | |
1674 | ||
1675 | /* Otherwise, be backwards compatible */ | |
52666986 JPM |
1676 | |
1677 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
1678 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
02d11ca2 | 1679 | return 0; |
52666986 JPM |
1680 | } |
1681 | ||
1682 | /* Don't NACK if one was recently sent or peeked */ | |
1683 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
1684 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
02d11ca2 | 1685 | return 0; |
52666986 JPM |
1686 | } |
1687 | ||
1688 | /* Conditionally delay NACK sending until next synch rcv */ | |
1689 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
1690 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1691 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
02d11ca2 | 1692 | return 0; |
52666986 JPM |
1693 | } |
1694 | ||
1695 | /* Send NACK now but suppress next one */ | |
1696 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
1697 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
02d11ca2 | 1698 | return 0; |
52666986 JPM |
1699 | } |
1700 | ||
1701 | void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, | |
1702 | struct sk_buff_head *xmitq) | |
1703 | { | |
1704 | struct sk_buff *skb, *tmp; | |
1705 | struct tipc_link *snd_l = l->bc_sndlink; | |
1706 | ||
1707 | if (!link_is_up(l) || !l->bc_peer_is_up) | |
1708 | return; | |
1709 | ||
1710 | if (!more(acked, l->acked)) | |
1711 | return; | |
1712 | ||
1713 | /* Skip over packets peer has already acked */ | |
1714 | skb_queue_walk(&snd_l->transmq, skb) { | |
1715 | if (more(buf_seqno(skb), l->acked)) | |
1716 | break; | |
1717 | } | |
1718 | ||
1719 | /* Update/release the packets peer is acking now */ | |
1720 | skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { | |
1721 | if (more(buf_seqno(skb), acked)) | |
1722 | break; | |
1723 | if (!--TIPC_SKB_CB(skb)->ackers) { | |
1724 | __skb_unlink(skb, &snd_l->transmq); | |
1725 | kfree_skb(skb); | |
1726 | } | |
1727 | } | |
1728 | l->acked = acked; | |
1729 | tipc_link_advance_backlog(snd_l, xmitq); | |
1730 | if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) | |
1731 | link_prepare_wakeup(snd_l); | |
1732 | } | |
1733 | ||
1734 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
02d11ca2 JPM |
1735 | * This function is here for backwards compatibility, since |
1736 | * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5. | |
52666986 JPM |
1737 | */ |
1738 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1739 | struct sk_buff_head *xmitq) | |
1740 | { | |
1741 | struct tipc_msg *hdr = buf_msg(skb); | |
1742 | u32 dnode = msg_destnode(hdr); | |
1743 | int mtyp = msg_type(hdr); | |
1744 | u16 acked = msg_bcast_ack(hdr); | |
1745 | u16 from = acked + 1; | |
1746 | u16 to = msg_bcgap_to(hdr); | |
1747 | u16 peers_snd_nxt = to + 1; | |
1748 | int rc = 0; | |
1749 | ||
1750 | kfree_skb(skb); | |
1751 | ||
1752 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
1753 | return 0; | |
1754 | ||
1755 | if (mtyp != STATE_MSG) | |
1756 | return 0; | |
1757 | ||
e74a386d | 1758 | if (dnode == tipc_own_addr(l->net)) { |
52666986 JPM |
1759 | tipc_link_bc_ack_rcv(l, acked, xmitq); |
1760 | rc = tipc_link_retrans(l->bc_sndlink, from, to, xmitq); | |
1761 | l->stats.recv_nacks++; | |
1762 | return rc; | |
1763 | } | |
1764 | ||
1765 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
1766 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
1767 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1768 | ||
1769 | return 0; | |
1770 | } | |
1771 | ||
e3eea1eb | 1772 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1773 | { |
ed193ece | 1774 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1775 | |
1776 | l->window = win; | |
5a0950c2 JPM |
1777 | l->backlog[TIPC_LOW_IMPORTANCE].limit = max_t(u16, 50, win); |
1778 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = max_t(u16, 100, win * 2); | |
1779 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = max_t(u16, 150, win * 3); | |
1780 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = max_t(u16, 200, win * 4); | |
1f66d161 | 1781 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; |
b97bf3fd PL |
1782 | } |
1783 | ||
b97bf3fd | 1784 | /** |
38206d59 | 1785 | * link_reset_stats - reset link statistics |
1a90632d | 1786 | * @l: pointer to link |
b97bf3fd | 1787 | */ |
38206d59 | 1788 | void tipc_link_reset_stats(struct tipc_link *l) |
b97bf3fd | 1789 | { |
38206d59 JPM |
1790 | memset(&l->stats, 0, sizeof(l->stats)); |
1791 | if (!link_is_bc_sndlink(l)) { | |
1792 | l->stats.sent_info = l->snd_nxt; | |
1793 | l->stats.recv_info = l->rcv_nxt; | |
1794 | } | |
b97bf3fd PL |
1795 | } |
1796 | ||
1a20cc25 | 1797 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 1798 | { |
1a20cc25 | 1799 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 1800 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 1801 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 1802 | |
662921cd | 1803 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
1804 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
1805 | skb_queue_len(&l->transmq), head, tail, | |
1806 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 1807 | } |
0655f6a8 RA |
1808 | |
1809 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1810 | */ | |
1811 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1812 | { | |
1813 | int err; | |
1814 | ||
1815 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1816 | tipc_nl_prop_policy); | |
1817 | if (err) | |
1818 | return err; | |
1819 | ||
1820 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1821 | u32 prio; | |
1822 | ||
1823 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1824 | if (prio > TIPC_MAX_LINK_PRI) | |
1825 | return -EINVAL; | |
1826 | } | |
1827 | ||
1828 | if (props[TIPC_NLA_PROP_TOL]) { | |
1829 | u32 tol; | |
1830 | ||
1831 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1832 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1833 | return -EINVAL; | |
1834 | } | |
1835 | ||
1836 | if (props[TIPC_NLA_PROP_WIN]) { | |
1837 | u32 win; | |
1838 | ||
1839 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1840 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1841 | return -EINVAL; | |
1842 | } | |
1843 | ||
1844 | return 0; | |
1845 | } | |
7be57fc6 | 1846 | |
d8182804 | 1847 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
7be57fc6 RA |
1848 | { |
1849 | int i; | |
1850 | struct nlattr *stats; | |
1851 | ||
1852 | struct nla_map { | |
1853 | u32 key; | |
1854 | u32 val; | |
1855 | }; | |
1856 | ||
1857 | struct nla_map map[] = { | |
1858 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
1859 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
1860 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1861 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1862 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
1863 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
1864 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
1865 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1866 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1867 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1868 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1869 | s->msg_length_counts : 1}, | |
1870 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1871 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1872 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1873 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1874 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1875 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1876 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1877 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1878 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1879 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1880 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1881 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1882 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1883 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1884 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1885 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1886 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1887 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1888 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1889 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1890 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1891 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1892 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1893 | }; | |
1894 | ||
1895 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1896 | if (!stats) | |
1897 | return -EMSGSIZE; | |
1898 | ||
1899 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1900 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1901 | goto msg_full; | |
1902 | ||
1903 | nla_nest_end(skb, stats); | |
1904 | ||
1905 | return 0; | |
1906 | msg_full: | |
1907 | nla_nest_cancel(skb, stats); | |
1908 | ||
1909 | return -EMSGSIZE; | |
1910 | } | |
1911 | ||
1912 | /* Caller should hold appropriate locks to protect the link */ | |
5be9c086 JPM |
1913 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
1914 | struct tipc_link *link, int nlflags) | |
7be57fc6 RA |
1915 | { |
1916 | int err; | |
1917 | void *hdr; | |
1918 | struct nlattr *attrs; | |
1919 | struct nlattr *prop; | |
34747539 | 1920 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 1921 | |
bfb3e5dd | 1922 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 1923 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
1924 | if (!hdr) |
1925 | return -EMSGSIZE; | |
1926 | ||
1927 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1928 | if (!attrs) | |
1929 | goto msg_full; | |
1930 | ||
1931 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
1932 | goto attr_msg_full; | |
1933 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 1934 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 1935 | goto attr_msg_full; |
ed193ece | 1936 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 1937 | goto attr_msg_full; |
a97b9d3f | 1938 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt)) |
7be57fc6 | 1939 | goto attr_msg_full; |
a97b9d3f | 1940 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt)) |
7be57fc6 RA |
1941 | goto attr_msg_full; |
1942 | ||
1943 | if (tipc_link_is_up(link)) | |
1944 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1945 | goto attr_msg_full; | |
c72fa872 | 1946 | if (link->active) |
7be57fc6 RA |
1947 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
1948 | goto attr_msg_full; | |
1949 | ||
1950 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1951 | if (!prop) | |
1952 | goto attr_msg_full; | |
1953 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1954 | goto prop_msg_full; | |
1955 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
1956 | goto prop_msg_full; | |
1957 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 1958 | link->window)) |
7be57fc6 RA |
1959 | goto prop_msg_full; |
1960 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1961 | goto prop_msg_full; | |
1962 | nla_nest_end(msg->skb, prop); | |
1963 | ||
1964 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
1965 | if (err) | |
1966 | goto attr_msg_full; | |
1967 | ||
1968 | nla_nest_end(msg->skb, attrs); | |
1969 | genlmsg_end(msg->skb, hdr); | |
1970 | ||
1971 | return 0; | |
1972 | ||
1973 | prop_msg_full: | |
1974 | nla_nest_cancel(msg->skb, prop); | |
1975 | attr_msg_full: | |
1976 | nla_nest_cancel(msg->skb, attrs); | |
1977 | msg_full: | |
1978 | genlmsg_cancel(msg->skb, hdr); | |
1979 | ||
1980 | return -EMSGSIZE; | |
1981 | } | |
38206d59 JPM |
1982 | |
1983 | static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, | |
1984 | struct tipc_stats *stats) | |
1985 | { | |
1986 | int i; | |
1987 | struct nlattr *nest; | |
1988 | ||
1989 | struct nla_map { | |
1990 | __u32 key; | |
1991 | __u32 val; | |
1992 | }; | |
1993 | ||
1994 | struct nla_map map[] = { | |
1995 | {TIPC_NLA_STATS_RX_INFO, stats->recv_info}, | |
1996 | {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, | |
1997 | {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, | |
1998 | {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, | |
1999 | {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, | |
2000 | {TIPC_NLA_STATS_TX_INFO, stats->sent_info}, | |
2001 | {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, | |
2002 | {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, | |
2003 | {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, | |
2004 | {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, | |
2005 | {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, | |
2006 | {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, | |
2007 | {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, | |
2008 | {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, | |
2009 | {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, | |
2010 | {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, | |
2011 | {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, | |
2012 | {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, | |
2013 | {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? | |
2014 | (stats->accu_queue_sz / stats->queue_sz_counts) : 0} | |
2015 | }; | |
2016 | ||
2017 | nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
2018 | if (!nest) | |
2019 | return -EMSGSIZE; | |
2020 | ||
2021 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2022 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2023 | goto msg_full; | |
2024 | ||
2025 | nla_nest_end(skb, nest); | |
2026 | ||
2027 | return 0; | |
2028 | msg_full: | |
2029 | nla_nest_cancel(skb, nest); | |
2030 | ||
2031 | return -EMSGSIZE; | |
2032 | } | |
2033 | ||
2034 | int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg) | |
2035 | { | |
2036 | int err; | |
2037 | void *hdr; | |
2038 | struct nlattr *attrs; | |
2039 | struct nlattr *prop; | |
2040 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
2041 | struct tipc_link *bcl = tn->bcl; | |
2042 | ||
2043 | if (!bcl) | |
2044 | return 0; | |
2045 | ||
2046 | tipc_bcast_lock(net); | |
2047 | ||
2048 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, | |
2049 | NLM_F_MULTI, TIPC_NL_LINK_GET); | |
b53ce3e7 IY |
2050 | if (!hdr) { |
2051 | tipc_bcast_unlock(net); | |
38206d59 | 2052 | return -EMSGSIZE; |
b53ce3e7 | 2053 | } |
38206d59 JPM |
2054 | |
2055 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2056 | if (!attrs) | |
2057 | goto msg_full; | |
2058 | ||
2059 | /* The broadcast link is always up */ | |
2060 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2061 | goto attr_msg_full; | |
2062 | ||
2063 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) | |
2064 | goto attr_msg_full; | |
2065 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) | |
2066 | goto attr_msg_full; | |
2067 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, bcl->rcv_nxt)) | |
2068 | goto attr_msg_full; | |
2069 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, bcl->snd_nxt)) | |
2070 | goto attr_msg_full; | |
2071 | ||
2072 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2073 | if (!prop) | |
2074 | goto attr_msg_full; | |
2075 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window)) | |
2076 | goto prop_msg_full; | |
2077 | nla_nest_end(msg->skb, prop); | |
2078 | ||
2079 | err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); | |
2080 | if (err) | |
2081 | goto attr_msg_full; | |
2082 | ||
2083 | tipc_bcast_unlock(net); | |
2084 | nla_nest_end(msg->skb, attrs); | |
2085 | genlmsg_end(msg->skb, hdr); | |
2086 | ||
2087 | return 0; | |
2088 | ||
2089 | prop_msg_full: | |
2090 | nla_nest_cancel(msg->skb, prop); | |
2091 | attr_msg_full: | |
2092 | nla_nest_cancel(msg->skb, attrs); | |
2093 | msg_full: | |
2094 | tipc_bcast_unlock(net); | |
2095 | genlmsg_cancel(msg->skb, hdr); | |
2096 | ||
2097 | return -EMSGSIZE; | |
2098 | } | |
2099 | ||
d01332f1 RA |
2100 | void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, |
2101 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2102 | { |
2103 | l->tolerance = tol; | |
d01332f1 | 2104 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, tol, 0, xmitq); |
38206d59 JPM |
2105 | } |
2106 | ||
d01332f1 RA |
2107 | void tipc_link_set_prio(struct tipc_link *l, u32 prio, |
2108 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2109 | { |
2110 | l->priority = prio; | |
d01332f1 | 2111 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, prio, xmitq); |
38206d59 JPM |
2112 | } |
2113 | ||
2114 | void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) | |
2115 | { | |
2116 | l->abort_limit = limit; | |
2117 | } |