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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 | 49 | struct tipc_stats { |
95901122 JPM |
50 | u32 sent_pkts; |
51 | u32 recv_pkts; | |
38206d59 JPM |
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 | |
a4dc70d4 JM |
109 | * @stale_cnt: counter for number of identical retransmit attempts |
110 | * @stale_limit: time when repeated identical retransmits must force link reset | |
38206d59 JPM |
111 | * @ackers: # of peers that needs to ack each packet before it can be released |
112 | * @acked: # last packet acked by a certain peer. Used for broadcast. | |
113 | * @rcv_nxt: next sequence number to expect for inbound messages | |
114 | * @deferred_queue: deferred queue saved OOS b'cast message received from node | |
115 | * @unacked_window: # of inbound messages rx'd without ack'ing back to peer | |
116 | * @inputq: buffer queue for messages to be delivered upwards | |
117 | * @namedq: buffer queue for name table messages to be delivered upwards | |
118 | * @next_out: ptr to first unsent outbound message in queue | |
119 | * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate | |
120 | * @long_msg_seq_no: next identifier to use for outbound fragmented messages | |
121 | * @reasm_buf: head of partially reassembled inbound message fragments | |
122 | * @bc_rcvr: marks that this is a broadcast receiver link | |
123 | * @stats: collects statistics regarding link activity | |
124 | */ | |
125 | struct tipc_link { | |
126 | u32 addr; | |
127 | char name[TIPC_MAX_LINK_NAME]; | |
38206d59 JPM |
128 | struct net *net; |
129 | ||
130 | /* Management and link supervision data */ | |
7ea817f4 JM |
131 | u16 peer_session; |
132 | u16 session; | |
9012de50 JM |
133 | u16 snd_nxt_state; |
134 | u16 rcv_nxt_state; | |
38206d59 JPM |
135 | u32 peer_bearer_id; |
136 | u32 bearer_id; | |
137 | u32 tolerance; | |
38206d59 JPM |
138 | u32 abort_limit; |
139 | u32 state; | |
140 | u16 peer_caps; | |
7ea817f4 | 141 | bool in_session; |
38206d59 JPM |
142 | bool active; |
143 | u32 silent_intv_cnt; | |
e74a386d | 144 | char if_name[TIPC_MAX_IF_NAME]; |
38206d59 JPM |
145 | u32 priority; |
146 | char net_plane; | |
35c55c98 | 147 | struct tipc_mon_state mon_state; |
88e8ac70 | 148 | u16 rst_cnt; |
38206d59 JPM |
149 | |
150 | /* Failover/synch */ | |
151 | u16 drop_point; | |
152 | struct sk_buff *failover_reasm_skb; | |
153 | ||
154 | /* Max packet negotiation */ | |
155 | u16 mtu; | |
156 | u16 advertised_mtu; | |
157 | ||
158 | /* Sending */ | |
159 | struct sk_buff_head transmq; | |
160 | struct sk_buff_head backlogq; | |
161 | struct { | |
162 | u16 len; | |
163 | u16 limit; | |
164 | } backlog[5]; | |
165 | u16 snd_nxt; | |
166 | u16 last_retransm; | |
167 | u16 window; | |
a4dc70d4 JM |
168 | u16 stale_cnt; |
169 | unsigned long stale_limit; | |
38206d59 JPM |
170 | |
171 | /* Reception */ | |
172 | u16 rcv_nxt; | |
173 | u32 rcv_unacked; | |
174 | struct sk_buff_head deferdq; | |
175 | struct sk_buff_head *inputq; | |
176 | struct sk_buff_head *namedq; | |
177 | ||
178 | /* Congestion handling */ | |
179 | struct sk_buff_head wakeupq; | |
180 | ||
181 | /* Fragmentation/reassembly */ | |
182 | struct sk_buff *reasm_buf; | |
183 | ||
184 | /* Broadcast */ | |
185 | u16 ackers; | |
186 | u16 acked; | |
187 | struct tipc_link *bc_rcvlink; | |
188 | struct tipc_link *bc_sndlink; | |
7c4a54b9 JPM |
189 | unsigned long prev_retr; |
190 | u16 prev_from; | |
191 | u16 prev_to; | |
192 | u8 nack_state; | |
38206d59 JPM |
193 | bool bc_peer_is_up; |
194 | ||
195 | /* Statistics */ | |
196 | struct tipc_stats stats; | |
197 | }; | |
198 | ||
2cf8aa19 EH |
199 | /* |
200 | * Error message prefixes | |
201 | */ | |
6e498158 | 202 | static const char *link_co_err = "Link tunneling error, "; |
2cf8aa19 | 203 | static const char *link_rst_msg = "Resetting link "; |
7be57fc6 | 204 | |
52666986 JPM |
205 | /* Send states for broadcast NACKs |
206 | */ | |
207 | enum { | |
208 | BC_NACK_SND_CONDITIONAL, | |
209 | BC_NACK_SND_UNCONDITIONAL, | |
210 | BC_NACK_SND_SUPPRESS, | |
211 | }; | |
212 | ||
7c4a54b9 JPM |
213 | #define TIPC_BC_RETR_LIMIT 10 /* [ms] */ |
214 | ||
d999297c JPM |
215 | /* |
216 | * Interval between NACKs when packets arrive out of order | |
217 | */ | |
218 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
e74a386d | 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 | 241 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
242 | bool probe_reply, u16 rcvgap, |
243 | int tolerance, int priority, | |
426cc2b8 | 244 | struct sk_buff_head *xmitq); |
1a90632d | 245 | static void link_print(struct tipc_link *l, const char *str); |
e0a05ebe JPM |
246 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
247 | struct sk_buff_head *xmitq); | |
52666986 JPM |
248 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
249 | struct sk_buff_head *xmitq); | |
250 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 to); | |
8b4ed863 | 251 | |
b97bf3fd | 252 | /* |
05790c64 | 253 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 254 | */ |
662921cd | 255 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 256 | { |
662921cd JPM |
257 | return link_is_up(l); |
258 | } | |
259 | ||
c8199300 JPM |
260 | bool tipc_link_peer_is_down(struct tipc_link *l) |
261 | { | |
262 | return l->state == LINK_PEER_RESET; | |
263 | } | |
264 | ||
662921cd JPM |
265 | bool tipc_link_is_reset(struct tipc_link *l) |
266 | { | |
267 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
268 | } | |
269 | ||
73f646ce JPM |
270 | bool tipc_link_is_establishing(struct tipc_link *l) |
271 | { | |
272 | return l->state == LINK_ESTABLISHING; | |
273 | } | |
274 | ||
662921cd JPM |
275 | bool tipc_link_is_synching(struct tipc_link *l) |
276 | { | |
277 | return l->state == LINK_SYNCHING; | |
278 | } | |
279 | ||
280 | bool tipc_link_is_failingover(struct tipc_link *l) | |
281 | { | |
282 | return l->state == LINK_FAILINGOVER; | |
283 | } | |
284 | ||
285 | bool tipc_link_is_blocked(struct tipc_link *l) | |
286 | { | |
287 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
288 | } |
289 | ||
742e0383 | 290 | static bool link_is_bc_sndlink(struct tipc_link *l) |
52666986 JPM |
291 | { |
292 | return !l->bc_sndlink; | |
293 | } | |
294 | ||
742e0383 | 295 | static bool link_is_bc_rcvlink(struct tipc_link *l) |
52666986 JPM |
296 | { |
297 | return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); | |
298 | } | |
299 | ||
c72fa872 JPM |
300 | void tipc_link_set_active(struct tipc_link *l, bool active) |
301 | { | |
302 | l->active = active; | |
b97bf3fd PL |
303 | } |
304 | ||
38206d59 JPM |
305 | u32 tipc_link_id(struct tipc_link *l) |
306 | { | |
307 | return l->peer_bearer_id << 16 | l->bearer_id; | |
308 | } | |
309 | ||
310 | int tipc_link_window(struct tipc_link *l) | |
311 | { | |
312 | return l->window; | |
313 | } | |
314 | ||
315 | int tipc_link_prio(struct tipc_link *l) | |
316 | { | |
317 | return l->priority; | |
318 | } | |
319 | ||
320 | unsigned long tipc_link_tolerance(struct tipc_link *l) | |
321 | { | |
322 | return l->tolerance; | |
323 | } | |
324 | ||
325 | struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) | |
326 | { | |
327 | return l->inputq; | |
328 | } | |
329 | ||
330 | char tipc_link_plane(struct tipc_link *l) | |
331 | { | |
332 | return l->net_plane; | |
333 | } | |
334 | ||
9012de50 JM |
335 | void tipc_link_update_caps(struct tipc_link *l, u16 capabilities) |
336 | { | |
337 | l->peer_caps = capabilities; | |
338 | } | |
339 | ||
52666986 JPM |
340 | void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
341 | struct tipc_link *uc_l, | |
342 | struct sk_buff_head *xmitq) | |
2f566124 | 343 | { |
52666986 JPM |
344 | struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
345 | ||
346 | snd_l->ackers++; | |
347 | rcv_l->acked = snd_l->snd_nxt - 1; | |
9a650838 | 348 | snd_l->state = LINK_ESTABLISHED; |
52666986 | 349 | tipc_link_build_bc_init_msg(uc_l, xmitq); |
2f566124 JPM |
350 | } |
351 | ||
52666986 JPM |
352 | void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
353 | struct tipc_link *rcv_l, | |
354 | struct sk_buff_head *xmitq) | |
2f566124 | 355 | { |
52666986 JPM |
356 | u16 ack = snd_l->snd_nxt - 1; |
357 | ||
358 | snd_l->ackers--; | |
a71eb720 JPM |
359 | rcv_l->bc_peer_is_up = true; |
360 | rcv_l->state = LINK_ESTABLISHED; | |
52666986 JPM |
361 | tipc_link_bc_ack_rcv(rcv_l, ack, xmitq); |
362 | tipc_link_reset(rcv_l); | |
363 | rcv_l->state = LINK_RESET; | |
364 | if (!snd_l->ackers) { | |
365 | tipc_link_reset(snd_l); | |
9a650838 | 366 | snd_l->state = LINK_RESET; |
52666986 JPM |
367 | __skb_queue_purge(xmitq); |
368 | } | |
2f566124 JPM |
369 | } |
370 | ||
371 | int tipc_link_bc_peers(struct tipc_link *l) | |
372 | { | |
373 | return l->ackers; | |
374 | } | |
375 | ||
e064cce1 | 376 | static u16 link_bc_rcv_gap(struct tipc_link *l) |
02d11ca2 JPM |
377 | { |
378 | struct sk_buff *skb = skb_peek(&l->deferdq); | |
379 | u16 gap = 0; | |
380 | ||
381 | if (more(l->snd_nxt, l->rcv_nxt)) | |
382 | gap = l->snd_nxt - l->rcv_nxt; | |
383 | if (skb) | |
384 | gap = buf_seqno(skb) - l->rcv_nxt; | |
385 | return gap; | |
386 | } | |
387 | ||
959e1781 JPM |
388 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
389 | { | |
390 | l->mtu = mtu; | |
391 | } | |
392 | ||
393 | int tipc_link_mtu(struct tipc_link *l) | |
394 | { | |
395 | return l->mtu; | |
396 | } | |
397 | ||
38206d59 JPM |
398 | u16 tipc_link_rcv_nxt(struct tipc_link *l) |
399 | { | |
400 | return l->rcv_nxt; | |
401 | } | |
402 | ||
403 | u16 tipc_link_acked(struct tipc_link *l) | |
404 | { | |
405 | return l->acked; | |
406 | } | |
407 | ||
408 | char *tipc_link_name(struct tipc_link *l) | |
409 | { | |
410 | return l->name; | |
411 | } | |
412 | ||
b97bf3fd | 413 | /** |
4323add6 | 414 | * tipc_link_create - create a new link |
440d8963 | 415 | * @n: pointer to associated node |
0e05498e JPM |
416 | * @if_name: associated interface name |
417 | * @bearer_id: id (index) of associated bearer | |
418 | * @tolerance: link tolerance to be used by link | |
419 | * @net_plane: network plane (A,B,c..) this link belongs to | |
420 | * @mtu: mtu to be advertised by link | |
421 | * @priority: priority to be used by link | |
422 | * @window: send window to be used by link | |
423 | * @session: session to be used by link | |
440d8963 | 424 | * @ownnode: identity of own node |
0e05498e | 425 | * @peer: node id of peer node |
fd556f20 | 426 | * @peer_caps: bitmap describing peer node capabilities |
52666986 JPM |
427 | * @bc_sndlink: the namespace global link used for broadcast sending |
428 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
440d8963 JPM |
429 | * @inputq: queue to put messages ready for delivery |
430 | * @namedq: queue to put binding table update messages ready for delivery | |
431 | * @link: return value, pointer to put the created link | |
c4307285 | 432 | * |
440d8963 | 433 | * Returns true if link was created, otherwise false |
b97bf3fd | 434 | */ |
c72fa872 | 435 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
0e05498e | 436 | int tolerance, char net_plane, u32 mtu, int priority, |
25b0b9c4 JM |
437 | int window, u32 session, u32 self, |
438 | u32 peer, u8 *peer_id, u16 peer_caps, | |
52666986 JPM |
439 | struct tipc_link *bc_sndlink, |
440 | struct tipc_link *bc_rcvlink, | |
441 | struct sk_buff_head *inputq, | |
442 | struct sk_buff_head *namedq, | |
440d8963 | 443 | struct tipc_link **link) |
b97bf3fd | 444 | { |
25b0b9c4 JM |
445 | char peer_str[NODE_ID_STR_LEN] = {0,}; |
446 | char self_str[NODE_ID_STR_LEN] = {0,}; | |
440d8963 | 447 | struct tipc_link *l; |
37b9c08a | 448 | |
440d8963 JPM |
449 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
450 | if (!l) | |
451 | return false; | |
452 | *link = l; | |
e74a386d | 453 | l->session = session; |
37b9c08a | 454 | |
25b0b9c4 JM |
455 | /* Set link name for unicast links only */ |
456 | if (peer_id) { | |
457 | tipc_nodeid2string(self_str, tipc_own_id(net)); | |
458 | if (strlen(self_str) > 16) | |
459 | sprintf(self_str, "%x", self); | |
460 | tipc_nodeid2string(peer_str, peer_id); | |
461 | if (strlen(peer_str) > 16) | |
462 | sprintf(peer_str, "%x", peer); | |
463 | } | |
464 | /* Peer i/f name will be completed by reset/activate message */ | |
7494cfa6 JM |
465 | snprintf(l->name, sizeof(l->name), "%s:%s-%s:unknown", |
466 | self_str, if_name, peer_str); | |
25b0b9c4 | 467 | |
e74a386d | 468 | strcpy(l->if_name, if_name); |
440d8963 | 469 | l->addr = peer; |
fd556f20 | 470 | l->peer_caps = peer_caps; |
c72fa872 | 471 | l->net = net; |
7ea817f4 | 472 | l->in_session = false; |
0e05498e JPM |
473 | l->bearer_id = bearer_id; |
474 | l->tolerance = tolerance; | |
475 | l->net_plane = net_plane; | |
476 | l->advertised_mtu = mtu; | |
477 | l->mtu = mtu; | |
478 | l->priority = priority; | |
479 | tipc_link_set_queue_limits(l, window); | |
c1ab3f1d | 480 | l->ackers = 1; |
52666986 JPM |
481 | l->bc_sndlink = bc_sndlink; |
482 | l->bc_rcvlink = bc_rcvlink; | |
440d8963 JPM |
483 | l->inputq = inputq; |
484 | l->namedq = namedq; | |
485 | l->state = LINK_RESETTING; | |
440d8963 JPM |
486 | __skb_queue_head_init(&l->transmq); |
487 | __skb_queue_head_init(&l->backlogq); | |
488 | __skb_queue_head_init(&l->deferdq); | |
489 | skb_queue_head_init(&l->wakeupq); | |
490 | skb_queue_head_init(l->inputq); | |
491 | return true; | |
b97bf3fd PL |
492 | } |
493 | ||
32301906 JPM |
494 | /** |
495 | * tipc_link_bc_create - create new link to be used for broadcast | |
496 | * @n: pointer to associated node | |
4c94cc2d | 497 | * @mtu: mtu to be used initially if no peers |
32301906 JPM |
498 | * @window: send window to be used |
499 | * @inputq: queue to put messages ready for delivery | |
500 | * @namedq: queue to put binding table update messages ready for delivery | |
501 | * @link: return value, pointer to put the created link | |
502 | * | |
503 | * Returns true if link was created, otherwise false | |
504 | */ | |
c72fa872 | 505 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, |
52666986 | 506 | int mtu, int window, u16 peer_caps, |
32301906 JPM |
507 | struct sk_buff_head *inputq, |
508 | struct sk_buff_head *namedq, | |
52666986 | 509 | struct tipc_link *bc_sndlink, |
32301906 JPM |
510 | struct tipc_link **link) |
511 | { | |
512 | struct tipc_link *l; | |
513 | ||
c72fa872 | 514 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, |
25b0b9c4 | 515 | 0, ownnode, peer, NULL, peer_caps, bc_sndlink, |
52666986 | 516 | NULL, inputq, namedq, link)) |
32301906 JPM |
517 | return false; |
518 | ||
519 | l = *link; | |
520 | strcpy(l->name, tipc_bclink_name); | |
521 | tipc_link_reset(l); | |
52666986 | 522 | l->state = LINK_RESET; |
2f566124 | 523 | l->ackers = 0; |
52666986 | 524 | l->bc_rcvlink = l; |
32301906 | 525 | |
52666986 JPM |
526 | /* Broadcast send link is always up */ |
527 | if (link_is_bc_sndlink(l)) | |
528 | l->state = LINK_ESTABLISHED; | |
d999297c | 529 | |
01fd12bb JPM |
530 | /* Disable replicast if even a single peer doesn't support it */ |
531 | if (link_is_bc_rcvlink(l) && !(peer_caps & TIPC_BCAST_RCAST)) | |
532 | tipc_bcast_disable_rcast(net); | |
533 | ||
52666986 | 534 | return true; |
d999297c JPM |
535 | } |
536 | ||
6ab30f9c JPM |
537 | /** |
538 | * tipc_link_fsm_evt - link finite state machine | |
539 | * @l: pointer to link | |
540 | * @evt: state machine event to be processed | |
6ab30f9c | 541 | */ |
662921cd | 542 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 543 | { |
5045f7b9 | 544 | int rc = 0; |
6ab30f9c JPM |
545 | |
546 | switch (l->state) { | |
662921cd | 547 | case LINK_RESETTING: |
6ab30f9c | 548 | switch (evt) { |
662921cd JPM |
549 | case LINK_PEER_RESET_EVT: |
550 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 551 | break; |
662921cd JPM |
552 | case LINK_RESET_EVT: |
553 | l->state = LINK_RESET; | |
554 | break; | |
555 | case LINK_FAILURE_EVT: | |
556 | case LINK_FAILOVER_BEGIN_EVT: | |
557 | case LINK_ESTABLISH_EVT: | |
558 | case LINK_FAILOVER_END_EVT: | |
559 | case LINK_SYNCH_BEGIN_EVT: | |
560 | case LINK_SYNCH_END_EVT: | |
561 | default: | |
562 | goto illegal_evt; | |
563 | } | |
564 | break; | |
565 | case LINK_RESET: | |
566 | switch (evt) { | |
567 | case LINK_PEER_RESET_EVT: | |
568 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 569 | break; |
662921cd JPM |
570 | case LINK_FAILOVER_BEGIN_EVT: |
571 | l->state = LINK_FAILINGOVER; | |
572 | case LINK_FAILURE_EVT: | |
573 | case LINK_RESET_EVT: | |
574 | case LINK_ESTABLISH_EVT: | |
575 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 576 | break; |
662921cd JPM |
577 | case LINK_SYNCH_BEGIN_EVT: |
578 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 579 | default: |
662921cd | 580 | goto illegal_evt; |
6ab30f9c JPM |
581 | } |
582 | break; | |
662921cd | 583 | case LINK_PEER_RESET: |
6ab30f9c | 584 | switch (evt) { |
662921cd JPM |
585 | case LINK_RESET_EVT: |
586 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 587 | break; |
662921cd JPM |
588 | case LINK_PEER_RESET_EVT: |
589 | case LINK_ESTABLISH_EVT: | |
590 | case LINK_FAILURE_EVT: | |
6ab30f9c | 591 | break; |
662921cd JPM |
592 | case LINK_SYNCH_BEGIN_EVT: |
593 | case LINK_SYNCH_END_EVT: | |
594 | case LINK_FAILOVER_BEGIN_EVT: | |
595 | case LINK_FAILOVER_END_EVT: | |
596 | default: | |
597 | goto illegal_evt; | |
598 | } | |
599 | break; | |
600 | case LINK_FAILINGOVER: | |
601 | switch (evt) { | |
602 | case LINK_FAILOVER_END_EVT: | |
603 | l->state = LINK_RESET; | |
6ab30f9c | 604 | break; |
662921cd JPM |
605 | case LINK_PEER_RESET_EVT: |
606 | case LINK_RESET_EVT: | |
607 | case LINK_ESTABLISH_EVT: | |
608 | case LINK_FAILURE_EVT: | |
609 | break; | |
610 | case LINK_FAILOVER_BEGIN_EVT: | |
611 | case LINK_SYNCH_BEGIN_EVT: | |
612 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 613 | default: |
662921cd | 614 | goto illegal_evt; |
6ab30f9c JPM |
615 | } |
616 | break; | |
662921cd | 617 | case LINK_ESTABLISHING: |
6ab30f9c | 618 | switch (evt) { |
662921cd JPM |
619 | case LINK_ESTABLISH_EVT: |
620 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 621 | break; |
662921cd JPM |
622 | case LINK_FAILOVER_BEGIN_EVT: |
623 | l->state = LINK_FAILINGOVER; | |
624 | break; | |
662921cd | 625 | case LINK_RESET_EVT: |
73f646ce JPM |
626 | l->state = LINK_RESET; |
627 | break; | |
662921cd | 628 | case LINK_FAILURE_EVT: |
73f646ce | 629 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
630 | case LINK_SYNCH_BEGIN_EVT: |
631 | case LINK_FAILOVER_END_EVT: | |
632 | break; | |
633 | case LINK_SYNCH_END_EVT: | |
634 | default: | |
635 | goto illegal_evt; | |
636 | } | |
637 | break; | |
638 | case LINK_ESTABLISHED: | |
639 | switch (evt) { | |
640 | case LINK_PEER_RESET_EVT: | |
641 | l->state = LINK_PEER_RESET; | |
642 | rc |= TIPC_LINK_DOWN_EVT; | |
643 | break; | |
644 | case LINK_FAILURE_EVT: | |
645 | l->state = LINK_RESETTING; | |
646 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 647 | break; |
662921cd JPM |
648 | case LINK_RESET_EVT: |
649 | l->state = LINK_RESET; | |
6ab30f9c | 650 | break; |
662921cd | 651 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 652 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 653 | break; |
662921cd JPM |
654 | case LINK_SYNCH_BEGIN_EVT: |
655 | l->state = LINK_SYNCHING; | |
656 | break; | |
662921cd JPM |
657 | case LINK_FAILOVER_BEGIN_EVT: |
658 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 659 | default: |
662921cd | 660 | goto illegal_evt; |
6ab30f9c JPM |
661 | } |
662 | break; | |
662921cd | 663 | case LINK_SYNCHING: |
6ab30f9c | 664 | switch (evt) { |
662921cd JPM |
665 | case LINK_PEER_RESET_EVT: |
666 | l->state = LINK_PEER_RESET; | |
667 | rc |= TIPC_LINK_DOWN_EVT; | |
668 | break; | |
669 | case LINK_FAILURE_EVT: | |
670 | l->state = LINK_RESETTING; | |
671 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 672 | break; |
662921cd JPM |
673 | case LINK_RESET_EVT: |
674 | l->state = LINK_RESET; | |
6ab30f9c | 675 | break; |
662921cd JPM |
676 | case LINK_ESTABLISH_EVT: |
677 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 678 | break; |
662921cd JPM |
679 | case LINK_SYNCH_END_EVT: |
680 | l->state = LINK_ESTABLISHED; | |
681 | break; | |
682 | case LINK_FAILOVER_BEGIN_EVT: | |
683 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 684 | default: |
662921cd | 685 | goto illegal_evt; |
6ab30f9c JPM |
686 | } |
687 | break; | |
688 | default: | |
662921cd | 689 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 690 | } |
662921cd JPM |
691 | return rc; |
692 | illegal_evt: | |
693 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
694 | evt, l->state, l->name); | |
6ab30f9c JPM |
695 | return rc; |
696 | } | |
697 | ||
333ef69e JPM |
698 | /* link_profile_stats - update statistical profiling of traffic |
699 | */ | |
700 | static void link_profile_stats(struct tipc_link *l) | |
701 | { | |
702 | struct sk_buff *skb; | |
703 | struct tipc_msg *msg; | |
704 | int length; | |
705 | ||
706 | /* Update counters used in statistical profiling of send traffic */ | |
707 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
708 | l->stats.queue_sz_counts++; | |
709 | ||
710 | skb = skb_peek(&l->transmq); | |
711 | if (!skb) | |
712 | return; | |
713 | msg = buf_msg(skb); | |
714 | length = msg_size(msg); | |
715 | ||
716 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
717 | if (msg_type(msg) != FIRST_FRAGMENT) | |
718 | return; | |
719 | length = msg_size(msg_get_wrapped(msg)); | |
720 | } | |
721 | l->stats.msg_lengths_total += length; | |
722 | l->stats.msg_length_counts++; | |
723 | if (length <= 64) | |
724 | l->stats.msg_length_profile[0]++; | |
725 | else if (length <= 256) | |
726 | l->stats.msg_length_profile[1]++; | |
727 | else if (length <= 1024) | |
728 | l->stats.msg_length_profile[2]++; | |
729 | else if (length <= 4096) | |
730 | l->stats.msg_length_profile[3]++; | |
731 | else if (length <= 16384) | |
732 | l->stats.msg_length_profile[4]++; | |
733 | else if (length <= 32768) | |
734 | l->stats.msg_length_profile[5]++; | |
735 | else | |
736 | l->stats.msg_length_profile[6]++; | |
737 | } | |
738 | ||
739 | /* tipc_link_timeout - perform periodic task as instructed from node timeout | |
740 | */ | |
741 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
742 | { | |
c91522f8 YX |
743 | int mtyp = 0; |
744 | int rc = 0; | |
42b18f60 JPM |
745 | bool state = false; |
746 | bool probe = false; | |
747 | bool setup = false; | |
52666986 JPM |
748 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
749 | u16 bc_acked = l->bc_rcvlink->acked; | |
35c55c98 | 750 | struct tipc_mon_state *mstate = &l->mon_state; |
5045f7b9 | 751 | |
662921cd JPM |
752 | switch (l->state) { |
753 | case LINK_ESTABLISHED: | |
754 | case LINK_SYNCHING: | |
42b18f60 | 755 | mtyp = STATE_MSG; |
35c55c98 JPM |
756 | link_profile_stats(l); |
757 | tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id); | |
758 | if (mstate->reset || (l->silent_intv_cnt > l->abort_limit)) | |
759 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
42b18f60 | 760 | state = bc_acked != bc_snt; |
35c55c98 JPM |
761 | state |= l->bc_rcvlink->rcv_unacked; |
762 | state |= l->rcv_unacked; | |
763 | state |= !skb_queue_empty(&l->transmq); | |
764 | state |= !skb_queue_empty(&l->deferdq); | |
765 | probe = mstate->probing; | |
766 | probe |= l->silent_intv_cnt; | |
767 | if (probe || mstate->monitoring) | |
768 | l->silent_intv_cnt++; | |
662921cd JPM |
769 | break; |
770 | case LINK_RESET: | |
42b18f60 JPM |
771 | setup = l->rst_cnt++ <= 4; |
772 | setup |= !(l->rst_cnt % 16); | |
5045f7b9 | 773 | mtyp = RESET_MSG; |
662921cd JPM |
774 | break; |
775 | case LINK_ESTABLISHING: | |
42b18f60 | 776 | setup = true; |
5045f7b9 | 777 | mtyp = ACTIVATE_MSG; |
662921cd | 778 | break; |
662921cd | 779 | case LINK_PEER_RESET: |
598411d7 | 780 | case LINK_RESETTING: |
662921cd JPM |
781 | case LINK_FAILINGOVER: |
782 | break; | |
783 | default: | |
784 | break; | |
5045f7b9 | 785 | } |
662921cd | 786 | |
42b18f60 | 787 | if (state || probe || setup) |
8d6e79d3 | 788 | tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, 0, xmitq); |
5045f7b9 | 789 | |
333ef69e JPM |
790 | return rc; |
791 | } | |
792 | ||
b97bf3fd | 793 | /** |
3127a020 | 794 | * link_schedule_user - schedule a message sender for wakeup after congestion |
365ad353 JPM |
795 | * @l: congested link |
796 | * @hdr: header of message that is being sent | |
50100a5e | 797 | * Create pseudo msg to send back to user when congestion abates |
b97bf3fd | 798 | */ |
365ad353 | 799 | static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr) |
b97bf3fd | 800 | { |
365ad353 JPM |
801 | u32 dnode = tipc_own_addr(l->net); |
802 | u32 dport = msg_origport(hdr); | |
3127a020 JPM |
803 | struct sk_buff *skb; |
804 | ||
3127a020 JPM |
805 | /* Create and schedule wakeup pseudo message */ |
806 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
365ad353 | 807 | dnode, l->addr, dport, 0, 0); |
3127a020 | 808 | if (!skb) |
22d85c79 | 809 | return -ENOBUFS; |
365ad353 JPM |
810 | msg_set_dest_droppable(buf_msg(skb), true); |
811 | TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr); | |
812 | skb_queue_tail(&l->wakeupq, skb); | |
813 | l->stats.link_congs++; | |
3127a020 | 814 | return -ELINKCONG; |
b97bf3fd PL |
815 | } |
816 | ||
50100a5e JPM |
817 | /** |
818 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
365ad353 JPM |
819 | * @l: congested link |
820 | * Wake up a number of waiting users, as permitted by available space | |
821 | * in the send queue | |
50100a5e | 822 | */ |
e064cce1 | 823 | static void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 824 | { |
58d78b32 | 825 | struct sk_buff *skb, *tmp; |
365ad353 | 826 | int imp, i = 0; |
50100a5e | 827 | |
1f66d161 JPM |
828 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
829 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
365ad353 JPM |
830 | if (l->backlog[imp].len < l->backlog[imp].limit) { |
831 | skb_unlink(skb, &l->wakeupq); | |
832 | skb_queue_tail(l->inputq, skb); | |
833 | } else if (i++ > 10) { | |
b97bf3fd | 834 | break; |
365ad353 | 835 | } |
b97bf3fd | 836 | } |
b97bf3fd PL |
837 | } |
838 | ||
6e498158 | 839 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 840 | { |
7ea817f4 | 841 | l->in_session = false; |
e74a386d | 842 | l->session++; |
6e498158 | 843 | l->mtu = l->advertised_mtu; |
6e498158 JPM |
844 | __skb_queue_purge(&l->transmq); |
845 | __skb_queue_purge(&l->deferdq); | |
23d8335d | 846 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
2af5ae37 JPM |
847 | __skb_queue_purge(&l->backlogq); |
848 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
849 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
850 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
851 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
852 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
6e498158 JPM |
853 | kfree_skb(l->reasm_buf); |
854 | kfree_skb(l->failover_reasm_skb); | |
855 | l->reasm_buf = NULL; | |
856 | l->failover_reasm_skb = NULL; | |
857 | l->rcv_unacked = 0; | |
858 | l->snd_nxt = 1; | |
859 | l->rcv_nxt = 1; | |
9012de50 JM |
860 | l->snd_nxt_state = 1; |
861 | l->rcv_nxt_state = 1; | |
c1ab3f1d | 862 | l->acked = 0; |
6e498158 | 863 | l->silent_intv_cnt = 0; |
88e8ac70 | 864 | l->rst_cnt = 0; |
a4dc70d4 | 865 | l->stale_cnt = 0; |
52666986 | 866 | l->bc_peer_is_up = false; |
35c55c98 | 867 | memset(&l->mon_state, 0, sizeof(l->mon_state)); |
38206d59 | 868 | tipc_link_reset_stats(l); |
b97bf3fd PL |
869 | } |
870 | ||
af9b028e JPM |
871 | /** |
872 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
873 | * @link: link to use | |
874 | * @list: chain of buffers containing message | |
875 | * @xmitq: returned list of packets to be sent by caller | |
876 | * | |
365ad353 | 877 | * Consumes the buffer chain. |
af9b028e JPM |
878 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
879 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
880 | */ | |
881 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
882 | struct sk_buff_head *xmitq) | |
883 | { | |
884 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
885 | unsigned int maxwin = l->window; | |
365ad353 | 886 | int imp = msg_importance(hdr); |
af9b028e JPM |
887 | unsigned int mtu = l->mtu; |
888 | u16 ack = l->rcv_nxt - 1; | |
889 | u16 seqno = l->snd_nxt; | |
52666986 | 890 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
af9b028e JPM |
891 | struct sk_buff_head *transmq = &l->transmq; |
892 | struct sk_buff_head *backlogq = &l->backlogq; | |
893 | struct sk_buff *skb, *_skb, *bskb; | |
95901122 | 894 | int pkt_cnt = skb_queue_len(list); |
365ad353 | 895 | int rc = 0; |
af9b028e | 896 | |
4952cd3e RA |
897 | if (unlikely(msg_size(hdr) > mtu)) { |
898 | skb_queue_purge(list); | |
af9b028e | 899 | return -EMSGSIZE; |
4952cd3e | 900 | } |
af9b028e | 901 | |
365ad353 JPM |
902 | /* Allow oversubscription of one data msg per source at congestion */ |
903 | if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) { | |
904 | if (imp == TIPC_SYSTEM_IMPORTANCE) { | |
905 | pr_warn("%s<%s>, link overflow", link_rst_msg, l->name); | |
906 | return -ENOBUFS; | |
907 | } | |
908 | rc = link_schedule_user(l, hdr); | |
909 | } | |
910 | ||
95901122 JPM |
911 | if (pkt_cnt > 1) { |
912 | l->stats.sent_fragmented++; | |
913 | l->stats.sent_fragments += pkt_cnt; | |
914 | } | |
915 | ||
af9b028e JPM |
916 | /* Prepare each packet for sending, and add to relevant queue: */ |
917 | while (skb_queue_len(list)) { | |
918 | skb = skb_peek(list); | |
919 | hdr = buf_msg(skb); | |
920 | msg_set_seqno(hdr, seqno); | |
921 | msg_set_ack(hdr, ack); | |
52666986 | 922 | msg_set_bcast_ack(hdr, bc_ack); |
af9b028e JPM |
923 | |
924 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
925 | _skb = skb_clone(skb, GFP_ATOMIC); | |
4952cd3e RA |
926 | if (!_skb) { |
927 | skb_queue_purge(list); | |
af9b028e | 928 | return -ENOBUFS; |
4952cd3e | 929 | } |
af9b028e JPM |
930 | __skb_dequeue(list); |
931 | __skb_queue_tail(transmq, skb); | |
932 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 933 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e | 934 | l->rcv_unacked = 0; |
95901122 | 935 | l->stats.sent_pkts++; |
af9b028e JPM |
936 | seqno++; |
937 | continue; | |
938 | } | |
939 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { | |
940 | kfree_skb(__skb_dequeue(list)); | |
941 | l->stats.sent_bundled++; | |
942 | continue; | |
943 | } | |
944 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { | |
945 | kfree_skb(__skb_dequeue(list)); | |
946 | __skb_queue_tail(backlogq, bskb); | |
947 | l->backlog[msg_importance(buf_msg(bskb))].len++; | |
948 | l->stats.sent_bundled++; | |
949 | l->stats.sent_bundles++; | |
950 | continue; | |
951 | } | |
952 | l->backlog[imp].len += skb_queue_len(list); | |
953 | skb_queue_splice_tail_init(list, backlogq); | |
954 | } | |
955 | l->snd_nxt = seqno; | |
365ad353 | 956 | return rc; |
af9b028e JPM |
957 | } |
958 | ||
e064cce1 Y |
959 | static void tipc_link_advance_backlog(struct tipc_link *l, |
960 | struct sk_buff_head *xmitq) | |
d999297c JPM |
961 | { |
962 | struct sk_buff *skb, *_skb; | |
963 | struct tipc_msg *hdr; | |
964 | u16 seqno = l->snd_nxt; | |
965 | u16 ack = l->rcv_nxt - 1; | |
52666986 | 966 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
967 | |
968 | while (skb_queue_len(&l->transmq) < l->window) { | |
969 | skb = skb_peek(&l->backlogq); | |
970 | if (!skb) | |
971 | break; | |
972 | _skb = skb_clone(skb, GFP_ATOMIC); | |
973 | if (!_skb) | |
974 | break; | |
975 | __skb_dequeue(&l->backlogq); | |
976 | hdr = buf_msg(skb); | |
977 | l->backlog[msg_importance(hdr)].len--; | |
978 | __skb_queue_tail(&l->transmq, skb); | |
979 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 980 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 981 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
982 | msg_set_ack(hdr, ack); |
983 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c | 984 | l->rcv_unacked = 0; |
95901122 | 985 | l->stats.sent_pkts++; |
d999297c JPM |
986 | seqno++; |
987 | } | |
988 | l->snd_nxt = seqno; | |
989 | } | |
990 | ||
52666986 | 991 | static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb) |
d356eeba | 992 | { |
52666986 JPM |
993 | struct tipc_msg *hdr = buf_msg(skb); |
994 | ||
995 | pr_warn("Retransmission failure on link <%s>\n", l->name); | |
40501f90 | 996 | link_print(l, "State of link "); |
52666986 JPM |
997 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", |
998 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
999 | pr_info("sqno %u, prev: %x, src: %x\n", | |
1000 | msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr)); | |
d356eeba AS |
1001 | } |
1002 | ||
a4dc70d4 JM |
1003 | /* tipc_link_retrans() - retransmit one or more packets |
1004 | * @l: the link to transmit on | |
1005 | * @r: the receiving link ordering the retransmit. Same as l if unicast | |
1006 | * @from: retransmit from (inclusive) this sequence number | |
1007 | * @to: retransmit to (inclusive) this sequence number | |
1008 | * xmitq: queue for accumulating the retransmitted packets | |
1009 | */ | |
e064cce1 Y |
1010 | static int tipc_link_retrans(struct tipc_link *l, struct tipc_link *r, |
1011 | u16 from, u16 to, struct sk_buff_head *xmitq) | |
d999297c JPM |
1012 | { |
1013 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
52666986 | 1014 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
a4dc70d4 JM |
1015 | u16 ack = l->rcv_nxt - 1; |
1016 | struct tipc_msg *hdr; | |
d999297c JPM |
1017 | |
1018 | if (!skb) | |
1019 | return 0; | |
1020 | ||
1021 | /* Detect repeated retransmit failures on same packet */ | |
a4dc70d4 JM |
1022 | if (r->last_retransm != buf_seqno(skb)) { |
1023 | r->last_retransm = buf_seqno(skb); | |
1024 | r->stale_limit = jiffies + msecs_to_jiffies(l->tolerance); | |
1025 | } else if (++r->stale_cnt > 99 && time_after(jiffies, r->stale_limit)) { | |
d999297c | 1026 | link_retransmit_failure(l, skb); |
40501f90 JPM |
1027 | if (link_is_bc_sndlink(l)) |
1028 | return TIPC_LINK_DOWN_EVT; | |
662921cd | 1029 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
d999297c | 1030 | } |
c1ab3f1d | 1031 | |
d999297c | 1032 | skb_queue_walk(&l->transmq, skb) { |
d999297c | 1033 | hdr = buf_msg(skb); |
a4dc70d4 JM |
1034 | if (less(msg_seqno(hdr), from)) |
1035 | continue; | |
1036 | if (more(msg_seqno(hdr), to)) | |
1037 | break; | |
d999297c JPM |
1038 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); |
1039 | if (!_skb) | |
1040 | return 0; | |
1041 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
1042 | msg_set_ack(hdr, ack); |
1043 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
1044 | _skb->priority = TC_PRIO_CONTROL; |
1045 | __skb_queue_tail(xmitq, _skb); | |
d999297c JPM |
1046 | l->stats.retransmitted++; |
1047 | } | |
1048 | return 0; | |
1049 | } | |
1050 | ||
c637c103 | 1051 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1052 | * |
c637c103 | 1053 | * Consumes buffer if message is of right type |
7ae934be EH |
1054 | * Node lock must be held |
1055 | */ | |
52666986 | 1056 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 1057 | struct sk_buff_head *inputq) |
7ae934be | 1058 | { |
399574d4 | 1059 | struct sk_buff_head *mc_inputq = l->bc_rcvlink->inputq; |
a853e4c6 JPM |
1060 | struct tipc_msg *hdr = buf_msg(skb); |
1061 | ||
1062 | switch (msg_user(hdr)) { | |
c637c103 JPM |
1063 | case TIPC_LOW_IMPORTANCE: |
1064 | case TIPC_MEDIUM_IMPORTANCE: | |
1065 | case TIPC_HIGH_IMPORTANCE: | |
1066 | case TIPC_CRITICAL_IMPORTANCE: | |
2f487712 | 1067 | if (unlikely(msg_in_group(hdr) || msg_mcast(hdr))) { |
399574d4 | 1068 | skb_queue_tail(mc_inputq, skb); |
a853e4c6 JPM |
1069 | return true; |
1070 | } | |
c53e0c78 | 1071 | /* else: fall through */ |
2f487712 | 1072 | case CONN_MANAGER: |
36c0a9df | 1073 | skb_queue_tail(inputq, skb); |
c637c103 | 1074 | return true; |
399574d4 JM |
1075 | case GROUP_PROTOCOL: |
1076 | skb_queue_tail(mc_inputq, skb); | |
1077 | return true; | |
7ae934be | 1078 | case NAME_DISTRIBUTOR: |
52666986 JPM |
1079 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
1080 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
1081 | return true; |
1082 | case MSG_BUNDLER: | |
dff29b1a | 1083 | case TUNNEL_PROTOCOL: |
c637c103 | 1084 | case MSG_FRAGMENTER: |
7ae934be | 1085 | case BCAST_PROTOCOL: |
c637c103 | 1086 | return false; |
7ae934be | 1087 | default: |
c637c103 JPM |
1088 | pr_warn("Dropping received illegal msg type\n"); |
1089 | kfree_skb(skb); | |
1090 | return false; | |
1091 | }; | |
7ae934be | 1092 | } |
c637c103 JPM |
1093 | |
1094 | /* tipc_link_input - process packet that has passed link protocol check | |
1095 | * | |
1096 | * Consumes buffer | |
7ae934be | 1097 | */ |
9073fb8b JPM |
1098 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
1099 | struct sk_buff_head *inputq) | |
7ae934be | 1100 | { |
6e498158 JPM |
1101 | struct tipc_msg *hdr = buf_msg(skb); |
1102 | struct sk_buff **reasm_skb = &l->reasm_buf; | |
c637c103 | 1103 | struct sk_buff *iskb; |
9945e804 | 1104 | struct sk_buff_head tmpq; |
6e498158 | 1105 | int usr = msg_user(hdr); |
6144a996 | 1106 | int rc = 0; |
6e498158 JPM |
1107 | int pos = 0; |
1108 | int ipos = 0; | |
c637c103 | 1109 | |
6e498158 JPM |
1110 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
1111 | if (msg_type(hdr) == SYNCH_MSG) { | |
1112 | __skb_queue_purge(&l->deferdq); | |
1113 | goto drop; | |
8b4ed863 | 1114 | } |
6e498158 JPM |
1115 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
1116 | return rc; | |
1117 | kfree_skb(skb); | |
1118 | skb = iskb; | |
1119 | hdr = buf_msg(skb); | |
1120 | if (less(msg_seqno(hdr), l->drop_point)) | |
1121 | goto drop; | |
9073fb8b | 1122 | if (tipc_data_input(l, skb, inputq)) |
6e498158 JPM |
1123 | return rc; |
1124 | usr = msg_user(hdr); | |
1125 | reasm_skb = &l->failover_reasm_skb; | |
1126 | } | |
c637c103 | 1127 | |
6e498158 | 1128 | if (usr == MSG_BUNDLER) { |
9945e804 | 1129 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1130 | l->stats.recv_bundles++; |
1131 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1132 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1133 | tipc_data_input(l, iskb, &tmpq); |
1134 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1135 | return 0; |
6e498158 JPM |
1136 | } else if (usr == MSG_FRAGMENTER) { |
1137 | l->stats.recv_fragments++; | |
1138 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1139 | l->stats.recv_fragmented++; | |
9073fb8b | 1140 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
1141 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
1142 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 1143 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1144 | } |
662921cd | 1145 | return 0; |
6e498158 | 1146 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 1147 | tipc_bcast_lock(l->net); |
52666986 | 1148 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 1149 | tipc_bcast_unlock(l->net); |
6e498158 JPM |
1150 | } |
1151 | drop: | |
1152 | kfree_skb(skb); | |
662921cd | 1153 | return 0; |
7ae934be EH |
1154 | } |
1155 | ||
d999297c JPM |
1156 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
1157 | { | |
1158 | bool released = false; | |
1159 | struct sk_buff *skb, *tmp; | |
1160 | ||
1161 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
1162 | if (more(buf_seqno(skb), acked)) | |
1163 | break; | |
1164 | __skb_unlink(skb, &l->transmq); | |
1165 | kfree_skb(skb); | |
1166 | released = true; | |
1167 | } | |
1168 | return released; | |
1169 | } | |
1170 | ||
34b9cd64 | 1171 | /* tipc_link_build_state_msg: prepare link state message for transmission |
52666986 JPM |
1172 | * |
1173 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
1174 | * risk of ack storms towards the sender | |
f9aa358a | 1175 | */ |
34b9cd64 | 1176 | int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 1177 | { |
52666986 JPM |
1178 | if (!l) |
1179 | return 0; | |
1180 | ||
1181 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
1182 | if (link_is_bc_rcvlink(l)) { | |
e74a386d | 1183 | if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) |
52666986 JPM |
1184 | return 0; |
1185 | l->rcv_unacked = 0; | |
02d11ca2 JPM |
1186 | |
1187 | /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */ | |
1188 | l->snd_nxt = l->rcv_nxt; | |
1189 | return TIPC_LINK_SND_STATE; | |
52666986 JPM |
1190 | } |
1191 | ||
1192 | /* Unicast ACK */ | |
f9aa358a JPM |
1193 | l->rcv_unacked = 0; |
1194 | l->stats.sent_acks++; | |
8d6e79d3 | 1195 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
52666986 | 1196 | return 0; |
f9aa358a JPM |
1197 | } |
1198 | ||
282b3a05 JPM |
1199 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1200 | */ | |
1201 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1202 | { | |
1203 | int mtyp = RESET_MSG; | |
634696b1 | 1204 | struct sk_buff *skb; |
282b3a05 JPM |
1205 | |
1206 | if (l->state == LINK_ESTABLISHING) | |
1207 | mtyp = ACTIVATE_MSG; | |
1208 | ||
8d6e79d3 | 1209 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, 0, xmitq); |
634696b1 JPM |
1210 | |
1211 | /* Inform peer that this endpoint is going down if applicable */ | |
1212 | skb = skb_peek_tail(xmitq); | |
1213 | if (skb && (l->state == LINK_RESET)) | |
1214 | msg_set_peer_stopping(buf_msg(skb), 1); | |
282b3a05 JPM |
1215 | } |
1216 | ||
f9aa358a | 1217 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
e0a05ebe JPM |
1218 | * Note that sending of broadcast NACK is coordinated among nodes, to |
1219 | * reduce the risk of NACK storms towards the sender | |
f9aa358a | 1220 | */ |
e0a05ebe JPM |
1221 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
1222 | struct sk_buff_head *xmitq) | |
f9aa358a JPM |
1223 | { |
1224 | u32 def_cnt = ++l->stats.deferred_recv; | |
e0a05ebe | 1225 | int match1, match2; |
f9aa358a | 1226 | |
e0a05ebe JPM |
1227 | if (link_is_bc_rcvlink(l)) { |
1228 | match1 = def_cnt & 0xf; | |
1229 | match2 = tipc_own_addr(l->net) & 0xf; | |
1230 | if (match1 == match2) | |
1231 | return TIPC_LINK_SND_STATE; | |
1232 | return 0; | |
1233 | } | |
52666986 | 1234 | |
f9aa358a | 1235 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) |
8d6e79d3 | 1236 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
e0a05ebe | 1237 | return 0; |
f9aa358a JPM |
1238 | } |
1239 | ||
d999297c | 1240 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1241 | * @l: the link that should handle the message |
d999297c JPM |
1242 | * @skb: TIPC packet |
1243 | * @xmitq: queue to place packets to be sent after this call | |
1244 | */ | |
1245 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1246 | struct sk_buff_head *xmitq) | |
1247 | { | |
f9aa358a | 1248 | struct sk_buff_head *defq = &l->deferdq; |
d999297c | 1249 | struct tipc_msg *hdr; |
81204c49 | 1250 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1251 | int rc = 0; |
1252 | ||
f9aa358a | 1253 | do { |
d999297c | 1254 | hdr = buf_msg(skb); |
f9aa358a JPM |
1255 | seqno = msg_seqno(hdr); |
1256 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1257 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c JPM |
1258 | |
1259 | /* Verify and update link state */ | |
f9aa358a JPM |
1260 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
1261 | return tipc_link_proto_rcv(l, skb, xmitq); | |
d999297c | 1262 | |
662921cd | 1263 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1264 | if (l->state == LINK_ESTABLISHING) |
1265 | rc = TIPC_LINK_UP_EVT; | |
1266 | goto drop; | |
d999297c JPM |
1267 | } |
1268 | ||
f9aa358a | 1269 | /* Don't send probe at next timeout expiration */ |
d999297c JPM |
1270 | l->silent_intv_cnt = 0; |
1271 | ||
81204c49 JPM |
1272 | /* Drop if outside receive window */ |
1273 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1274 | l->stats.duplicates++; | |
1275 | goto drop; | |
1276 | } | |
1277 | ||
d999297c JPM |
1278 | /* Forward queues and wake up waiting users */ |
1279 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
a4dc70d4 | 1280 | l->stale_cnt = 0; |
d999297c JPM |
1281 | tipc_link_advance_backlog(l, xmitq); |
1282 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1283 | link_prepare_wakeup(l); | |
1284 | } | |
1285 | ||
81204c49 JPM |
1286 | /* Defer delivery if sequence gap */ |
1287 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1288 | __tipc_skb_queue_sorted(defq, seqno, skb); |
e0a05ebe | 1289 | rc |= tipc_link_build_nack_msg(l, xmitq); |
f9aa358a | 1290 | break; |
d999297c JPM |
1291 | } |
1292 | ||
81204c49 | 1293 | /* Deliver packet */ |
d999297c | 1294 | l->rcv_nxt++; |
95901122 | 1295 | l->stats.recv_pkts++; |
f9aa358a | 1296 | if (!tipc_data_input(l, skb, l->inputq)) |
52666986 | 1297 | rc |= tipc_link_input(l, skb, l->inputq); |
f9aa358a | 1298 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
34b9cd64 | 1299 | rc |= tipc_link_build_state_msg(l, xmitq); |
02d11ca2 | 1300 | if (unlikely(rc & ~TIPC_LINK_SND_STATE)) |
52666986 | 1301 | break; |
f9aa358a JPM |
1302 | } while ((skb = __skb_dequeue(defq))); |
1303 | ||
1304 | return rc; | |
1305 | drop: | |
1306 | kfree_skb(skb); | |
d999297c JPM |
1307 | return rc; |
1308 | } | |
1309 | ||
426cc2b8 | 1310 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
1311 | bool probe_reply, u16 rcvgap, |
1312 | int tolerance, int priority, | |
426cc2b8 JPM |
1313 | struct sk_buff_head *xmitq) |
1314 | { | |
02d11ca2 | 1315 | struct tipc_link *bcl = l->bc_rcvlink; |
e74a386d JPM |
1316 | struct sk_buff *skb; |
1317 | struct tipc_msg *hdr; | |
1318 | struct sk_buff_head *dfq = &l->deferdq; | |
02d11ca2 | 1319 | bool node_up = link_is_up(bcl); |
35c55c98 JPM |
1320 | struct tipc_mon_state *mstate = &l->mon_state; |
1321 | int dlen = 0; | |
1322 | void *data; | |
426cc2b8 JPM |
1323 | |
1324 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1325 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1326 | return; |
1327 | ||
e74a386d JPM |
1328 | if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) |
1329 | return; | |
1330 | ||
1331 | if (!skb_queue_empty(dfq)) | |
1332 | rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; | |
1333 | ||
1334 | skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, | |
35c55c98 | 1335 | tipc_max_domain_size, l->addr, |
e74a386d JPM |
1336 | tipc_own_addr(l->net), 0, 0, 0); |
1337 | if (!skb) | |
1338 | return; | |
1339 | ||
1340 | hdr = buf_msg(skb); | |
35c55c98 | 1341 | data = msg_data(hdr); |
e74a386d JPM |
1342 | msg_set_session(hdr, l->session); |
1343 | msg_set_bearer_id(hdr, l->bearer_id); | |
426cc2b8 | 1344 | msg_set_net_plane(hdr, l->net_plane); |
52666986 JPM |
1345 | msg_set_next_sent(hdr, l->snd_nxt); |
1346 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
02d11ca2 | 1347 | msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); |
06bd2b1e | 1348 | msg_set_bc_ack_invalid(hdr, !node_up); |
52666986 | 1349 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); |
426cc2b8 JPM |
1350 | msg_set_link_tolerance(hdr, tolerance); |
1351 | msg_set_linkprio(hdr, priority); | |
1352 | msg_set_redundant_link(hdr, node_up); | |
1353 | msg_set_seq_gap(hdr, 0); | |
52666986 | 1354 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1355 | |
1356 | if (mtyp == STATE_MSG) { | |
9012de50 JM |
1357 | if (l->peer_caps & TIPC_LINK_PROTO_SEQNO) |
1358 | msg_set_seqno(hdr, l->snd_nxt_state++); | |
e74a386d | 1359 | msg_set_seq_gap(hdr, rcvgap); |
02d11ca2 | 1360 | msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl)); |
426cc2b8 | 1361 | msg_set_probe(hdr, probe); |
8d6e79d3 | 1362 | msg_set_is_keepalive(hdr, probe || probe_reply); |
35c55c98 JPM |
1363 | tipc_mon_prep(l->net, data, &dlen, mstate, l->bearer_id); |
1364 | msg_set_size(hdr, INT_H_SIZE + dlen); | |
1365 | skb_trim(skb, INT_H_SIZE + dlen); | |
426cc2b8 | 1366 | l->stats.sent_states++; |
52666986 | 1367 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1368 | } else { |
1369 | /* RESET_MSG or ACTIVATE_MSG */ | |
1370 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
35c55c98 JPM |
1371 | strcpy(data, l->if_name); |
1372 | msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
1373 | skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
426cc2b8 | 1374 | } |
e74a386d JPM |
1375 | if (probe) |
1376 | l->stats.sent_probes++; | |
1377 | if (rcvgap) | |
1378 | l->stats.sent_nacks++; | |
426cc2b8 | 1379 | skb->priority = TC_PRIO_CONTROL; |
6e498158 | 1380 | __skb_queue_tail(xmitq, skb); |
b97bf3fd PL |
1381 | } |
1382 | ||
6e498158 | 1383 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1384 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1385 | */ |
6e498158 JPM |
1386 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1387 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1388 | { |
6e498158 JPM |
1389 | struct sk_buff *skb, *tnlskb; |
1390 | struct tipc_msg *hdr, tnlhdr; | |
1391 | struct sk_buff_head *queue = &l->transmq; | |
1392 | struct sk_buff_head tmpxq, tnlq; | |
1393 | u16 pktlen, pktcnt, seqno = l->snd_nxt; | |
b97bf3fd | 1394 | |
6e498158 | 1395 | if (!tnl) |
b97bf3fd PL |
1396 | return; |
1397 | ||
6e498158 JPM |
1398 | skb_queue_head_init(&tnlq); |
1399 | skb_queue_head_init(&tmpxq); | |
dd3f9e70 | 1400 | |
6e498158 JPM |
1401 | /* At least one packet required for safe algorithm => add dummy */ |
1402 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
e74a386d | 1403 | BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net), |
6e498158 JPM |
1404 | 0, 0, TIPC_ERR_NO_PORT); |
1405 | if (!skb) { | |
1406 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
b97bf3fd PL |
1407 | return; |
1408 | } | |
6e498158 JPM |
1409 | skb_queue_tail(&tnlq, skb); |
1410 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1411 | __skb_queue_purge(&tmpxq); | |
1412 | ||
1413 | /* Initialize reusable tunnel packet header */ | |
e74a386d | 1414 | tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, |
6e498158 JPM |
1415 | mtyp, INT_H_SIZE, l->addr); |
1416 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); | |
1417 | msg_set_msgcnt(&tnlhdr, pktcnt); | |
1418 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1419 | tnl: | |
1420 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1421 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1422 | hdr = buf_msg(skb); |
1423 | if (queue == &l->backlogq) | |
1424 | msg_set_seqno(hdr, seqno++); | |
1425 | pktlen = msg_size(hdr); | |
1426 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); | |
57d5f64d | 1427 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE, GFP_ATOMIC); |
6e498158 JPM |
1428 | if (!tnlskb) { |
1429 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1430 | return; |
1431 | } | |
6e498158 JPM |
1432 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1433 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1434 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1435 | } |
6e498158 JPM |
1436 | if (queue != &l->backlogq) { |
1437 | queue = &l->backlogq; | |
1438 | goto tnl; | |
f006c9c7 | 1439 | } |
1dab3d5a | 1440 | |
6e498158 | 1441 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1442 | |
6e498158 JPM |
1443 | if (mtyp == FAILOVER_MSG) { |
1444 | tnl->drop_point = l->rcv_nxt; | |
1445 | tnl->failover_reasm_skb = l->reasm_buf; | |
1446 | l->reasm_buf = NULL; | |
2da71425 | 1447 | } |
b97bf3fd PL |
1448 | } |
1449 | ||
7ea817f4 JM |
1450 | /* tipc_link_validate_msg(): validate message against current link state |
1451 | * Returns true if message should be accepted, otherwise false | |
1452 | */ | |
1453 | bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr) | |
1454 | { | |
1455 | u16 curr_session = l->peer_session; | |
1456 | u16 session = msg_session(hdr); | |
1457 | int mtyp = msg_type(hdr); | |
1458 | ||
1459 | if (msg_user(hdr) != LINK_PROTOCOL) | |
1460 | return true; | |
1461 | ||
1462 | switch (mtyp) { | |
1463 | case RESET_MSG: | |
1464 | if (!l->in_session) | |
1465 | return true; | |
1466 | /* Accept only RESET with new session number */ | |
1467 | return more(session, curr_session); | |
1468 | case ACTIVATE_MSG: | |
1469 | if (!l->in_session) | |
1470 | return true; | |
1471 | /* Accept only ACTIVATE with new or current session number */ | |
1472 | return !less(session, curr_session); | |
1473 | case STATE_MSG: | |
1474 | /* Accept only STATE with current session number */ | |
1475 | if (!l->in_session) | |
1476 | return false; | |
1477 | if (session != curr_session) | |
1478 | return false; | |
1479 | if (!(l->peer_caps & TIPC_LINK_PROTO_SEQNO)) | |
1480 | return true; | |
1481 | /* Accept only STATE with new sequence number */ | |
1482 | return !less(msg_seqno(hdr), l->rcv_nxt_state); | |
1483 | default: | |
1484 | return false; | |
1485 | } | |
1486 | } | |
1487 | ||
d999297c JPM |
1488 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1489 | * Note that network plane id propagates through the network, and may | |
1490 | * change at any time. The node with lowest numerical id determines | |
1491 | * network plane | |
1492 | */ | |
1493 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1494 | struct sk_buff_head *xmitq) | |
1495 | { | |
1496 | struct tipc_msg *hdr = buf_msg(skb); | |
1497 | u16 rcvgap = 0; | |
c1ab3f1d JPM |
1498 | u16 ack = msg_ack(hdr); |
1499 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1500 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1501 | u16 peers_tol = msg_link_tolerance(hdr); | |
1502 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1503 | u16 rcv_nxt = l->rcv_nxt; |
35c55c98 | 1504 | u16 dlen = msg_data_sz(hdr); |
73f646ce | 1505 | int mtyp = msg_type(hdr); |
8d6e79d3 | 1506 | bool reply = msg_probe(hdr); |
35c55c98 | 1507 | void *data; |
d999297c JPM |
1508 | char *if_name; |
1509 | int rc = 0; | |
1510 | ||
52666986 | 1511 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
1512 | goto exit; |
1513 | ||
e74a386d | 1514 | if (tipc_own_addr(l->net) > msg_prevnode(hdr)) |
d999297c JPM |
1515 | l->net_plane = msg_net_plane(hdr); |
1516 | ||
35c55c98 JPM |
1517 | skb_linearize(skb); |
1518 | hdr = buf_msg(skb); | |
1519 | data = msg_data(hdr); | |
1520 | ||
7ea817f4 JM |
1521 | if (!tipc_link_validate_msg(l, hdr)) |
1522 | goto exit; | |
1523 | ||
73f646ce | 1524 | switch (mtyp) { |
d999297c | 1525 | case RESET_MSG: |
d999297c | 1526 | case ACTIVATE_MSG: |
d999297c JPM |
1527 | /* Complete own link name with peer's interface name */ |
1528 | if_name = strrchr(l->name, ':') + 1; | |
1529 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1530 | break; | |
1531 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1532 | break; | |
35c55c98 | 1533 | strncpy(if_name, data, TIPC_MAX_IF_NAME); |
d999297c JPM |
1534 | |
1535 | /* Update own tolerance if peer indicates a non-zero value */ | |
1536 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1537 | l->tolerance = peers_tol; | |
1538 | ||
1539 | /* Update own priority if peer's priority is higher */ | |
1540 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1541 | l->priority = peers_prio; | |
1542 | ||
73f646ce | 1543 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
634696b1 JPM |
1544 | if (msg_peer_stopping(hdr)) |
1545 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1546 | else if ((mtyp == RESET_MSG) || !link_is_up(l)) | |
73f646ce JPM |
1547 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); |
1548 | ||
1549 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
1550 | if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING)) | |
1551 | rc = TIPC_LINK_UP_EVT; | |
1552 | ||
d999297c | 1553 | l->peer_session = msg_session(hdr); |
7ea817f4 | 1554 | l->in_session = true; |
d999297c | 1555 | l->peer_bearer_id = msg_bearer_id(hdr); |
d999297c JPM |
1556 | if (l->mtu > msg_max_pkt(hdr)) |
1557 | l->mtu = msg_max_pkt(hdr); | |
1558 | break; | |
662921cd | 1559 | |
d999297c | 1560 | case STATE_MSG: |
9012de50 JM |
1561 | l->rcv_nxt_state = msg_seqno(hdr) + 1; |
1562 | ||
d999297c JPM |
1563 | /* Update own tolerance if peer indicates a non-zero value */ |
1564 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1565 | l->tolerance = peers_tol; | |
1566 | ||
f7967556 JPM |
1567 | /* Update own prio if peer indicates a different value */ |
1568 | if ((peers_prio != l->priority) && | |
1569 | in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) { | |
81729810 RA |
1570 | l->priority = peers_prio; |
1571 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1572 | } | |
1573 | ||
d999297c JPM |
1574 | l->silent_intv_cnt = 0; |
1575 | l->stats.recv_states++; | |
1576 | if (msg_probe(hdr)) | |
1577 | l->stats.recv_probes++; | |
73f646ce JPM |
1578 | |
1579 | if (!link_is_up(l)) { | |
1580 | if (l->state == LINK_ESTABLISHING) | |
1581 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 1582 | break; |
73f646ce | 1583 | } |
35c55c98 JPM |
1584 | tipc_mon_rcv(l->net, data, dlen, l->addr, |
1585 | &l->mon_state, l->bearer_id); | |
d999297c | 1586 | |
662921cd | 1587 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 1588 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c | 1589 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
8d6e79d3 JM |
1590 | if (rcvgap || reply) |
1591 | tipc_link_build_proto_msg(l, STATE_MSG, 0, reply, | |
1592 | rcvgap, 0, 0, xmitq); | |
c1ab3f1d | 1593 | tipc_link_release_pkts(l, ack); |
d999297c JPM |
1594 | |
1595 | /* If NACK, retransmit will now start at right position */ | |
c1ab3f1d | 1596 | if (gap) { |
40501f90 | 1597 | rc = tipc_link_retrans(l, l, ack + 1, ack + gap, xmitq); |
d999297c JPM |
1598 | l->stats.recv_nacks++; |
1599 | } | |
662921cd | 1600 | |
d999297c JPM |
1601 | tipc_link_advance_backlog(l, xmitq); |
1602 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1603 | link_prepare_wakeup(l); | |
1604 | } | |
1605 | exit: | |
1606 | kfree_skb(skb); | |
1607 | return rc; | |
1608 | } | |
1609 | ||
52666986 JPM |
1610 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
1611 | */ | |
1612 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
1613 | u16 peers_snd_nxt, | |
1614 | struct sk_buff_head *xmitq) | |
1615 | { | |
1616 | struct sk_buff *skb; | |
1617 | struct tipc_msg *hdr; | |
1618 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
1619 | u16 ack = l->rcv_nxt - 1; | |
1620 | u16 gap_to = peers_snd_nxt - 1; | |
1621 | ||
1622 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
e74a386d | 1623 | 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); |
52666986 JPM |
1624 | if (!skb) |
1625 | return false; | |
1626 | hdr = buf_msg(skb); | |
1627 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
1628 | msg_set_bcast_ack(hdr, ack); | |
1629 | msg_set_bcgap_after(hdr, ack); | |
1630 | if (dfrd_skb) | |
1631 | gap_to = buf_seqno(dfrd_skb) - 1; | |
1632 | msg_set_bcgap_to(hdr, gap_to); | |
1633 | msg_set_non_seq(hdr, bcast); | |
1634 | __skb_queue_tail(xmitq, skb); | |
1635 | return true; | |
1636 | } | |
1637 | ||
1638 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
1639 | * | |
1640 | * Give a newly added peer node the sequence number where it should | |
1641 | * start receiving and acking broadcast packets. | |
1642 | */ | |
742e0383 WF |
1643 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
1644 | struct sk_buff_head *xmitq) | |
52666986 JPM |
1645 | { |
1646 | struct sk_buff_head list; | |
1647 | ||
1648 | __skb_queue_head_init(&list); | |
1649 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
1650 | return; | |
06bd2b1e | 1651 | msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true); |
52666986 JPM |
1652 | tipc_link_xmit(l, &list, xmitq); |
1653 | } | |
1654 | ||
1655 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
1656 | */ | |
1657 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
1658 | { | |
1659 | int mtyp = msg_type(hdr); | |
1660 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1661 | ||
1662 | if (link_is_up(l)) | |
1663 | return; | |
1664 | ||
1665 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
1666 | l->rcv_nxt = peers_snd_nxt; | |
1667 | l->state = LINK_ESTABLISHED; | |
1668 | return; | |
1669 | } | |
1670 | ||
1671 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
1672 | return; | |
1673 | ||
1674 | if (msg_peer_node_is_up(hdr)) | |
1675 | return; | |
1676 | ||
1677 | /* Compatibility: accept older, less safe initial synch data */ | |
1678 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
1679 | l->rcv_nxt = peers_snd_nxt; | |
1680 | } | |
1681 | ||
7c4a54b9 JPM |
1682 | /* link_bc_retr eval()- check if the indicated range can be retransmitted now |
1683 | * - Adjust permitted range if there is overlap with previous retransmission | |
1684 | */ | |
1685 | static bool link_bc_retr_eval(struct tipc_link *l, u16 *from, u16 *to) | |
1686 | { | |
1687 | unsigned long elapsed = jiffies_to_msecs(jiffies - l->prev_retr); | |
1688 | ||
1689 | if (less(*to, *from)) | |
1690 | return false; | |
1691 | ||
1692 | /* New retransmission request */ | |
1693 | if ((elapsed > TIPC_BC_RETR_LIMIT) || | |
1694 | less(*to, l->prev_from) || more(*from, l->prev_to)) { | |
1695 | l->prev_from = *from; | |
1696 | l->prev_to = *to; | |
1697 | l->prev_retr = jiffies; | |
1698 | return true; | |
1699 | } | |
1700 | ||
1701 | /* Inside range of previous retransmit */ | |
1702 | if (!less(*from, l->prev_from) && !more(*to, l->prev_to)) | |
1703 | return false; | |
1704 | ||
1705 | /* Fully or partially outside previous range => exclude overlap */ | |
1706 | if (less(*from, l->prev_from)) { | |
1707 | *to = l->prev_from - 1; | |
1708 | l->prev_from = *from; | |
1709 | } | |
1710 | if (more(*to, l->prev_to)) { | |
1711 | *from = l->prev_to + 1; | |
1712 | l->prev_to = *to; | |
1713 | } | |
1714 | l->prev_retr = jiffies; | |
1715 | return true; | |
1716 | } | |
1717 | ||
52666986 JPM |
1718 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state |
1719 | */ | |
02d11ca2 JPM |
1720 | int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, |
1721 | struct sk_buff_head *xmitq) | |
52666986 | 1722 | { |
7c4a54b9 | 1723 | struct tipc_link *snd_l = l->bc_sndlink; |
52666986 | 1724 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); |
02d11ca2 JPM |
1725 | u16 from = msg_bcast_ack(hdr) + 1; |
1726 | u16 to = from + msg_bc_gap(hdr) - 1; | |
1727 | int rc = 0; | |
52666986 JPM |
1728 | |
1729 | if (!link_is_up(l)) | |
02d11ca2 | 1730 | return rc; |
52666986 JPM |
1731 | |
1732 | if (!msg_peer_node_is_up(hdr)) | |
02d11ca2 | 1733 | return rc; |
52666986 | 1734 | |
2d18ac4b JPM |
1735 | /* Open when peer ackowledges our bcast init msg (pkt #1) */ |
1736 | if (msg_ack(hdr)) | |
1737 | l->bc_peer_is_up = true; | |
1738 | ||
1739 | if (!l->bc_peer_is_up) | |
02d11ca2 | 1740 | return rc; |
52666986 | 1741 | |
7c4a54b9 JPM |
1742 | l->stats.recv_nacks++; |
1743 | ||
52666986 JPM |
1744 | /* Ignore if peers_snd_nxt goes beyond receive window */ |
1745 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
02d11ca2 JPM |
1746 | return rc; |
1747 | ||
7c4a54b9 | 1748 | if (link_bc_retr_eval(snd_l, &from, &to)) |
40501f90 | 1749 | rc = tipc_link_retrans(snd_l, l, from, to, xmitq); |
02d11ca2 JPM |
1750 | |
1751 | l->snd_nxt = peers_snd_nxt; | |
1752 | if (link_bc_rcv_gap(l)) | |
1753 | rc |= TIPC_LINK_SND_STATE; | |
1754 | ||
1755 | /* Return now if sender supports nack via STATE messages */ | |
1756 | if (l->peer_caps & TIPC_BCAST_STATE_NACK) | |
1757 | return rc; | |
1758 | ||
1759 | /* Otherwise, be backwards compatible */ | |
52666986 JPM |
1760 | |
1761 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
1762 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
02d11ca2 | 1763 | return 0; |
52666986 JPM |
1764 | } |
1765 | ||
1766 | /* Don't NACK if one was recently sent or peeked */ | |
1767 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
1768 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
02d11ca2 | 1769 | return 0; |
52666986 JPM |
1770 | } |
1771 | ||
1772 | /* Conditionally delay NACK sending until next synch rcv */ | |
1773 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
1774 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1775 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
02d11ca2 | 1776 | return 0; |
52666986 JPM |
1777 | } |
1778 | ||
1779 | /* Send NACK now but suppress next one */ | |
1780 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
1781 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
02d11ca2 | 1782 | return 0; |
52666986 JPM |
1783 | } |
1784 | ||
1785 | void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, | |
1786 | struct sk_buff_head *xmitq) | |
1787 | { | |
1788 | struct sk_buff *skb, *tmp; | |
1789 | struct tipc_link *snd_l = l->bc_sndlink; | |
1790 | ||
1791 | if (!link_is_up(l) || !l->bc_peer_is_up) | |
1792 | return; | |
1793 | ||
1794 | if (!more(acked, l->acked)) | |
1795 | return; | |
1796 | ||
1797 | /* Skip over packets peer has already acked */ | |
1798 | skb_queue_walk(&snd_l->transmq, skb) { | |
1799 | if (more(buf_seqno(skb), l->acked)) | |
1800 | break; | |
1801 | } | |
1802 | ||
1803 | /* Update/release the packets peer is acking now */ | |
1804 | skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { | |
1805 | if (more(buf_seqno(skb), acked)) | |
1806 | break; | |
1807 | if (!--TIPC_SKB_CB(skb)->ackers) { | |
1808 | __skb_unlink(skb, &snd_l->transmq); | |
1809 | kfree_skb(skb); | |
1810 | } | |
1811 | } | |
1812 | l->acked = acked; | |
1813 | tipc_link_advance_backlog(snd_l, xmitq); | |
1814 | if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) | |
1815 | link_prepare_wakeup(snd_l); | |
1816 | } | |
1817 | ||
1818 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
02d11ca2 JPM |
1819 | * This function is here for backwards compatibility, since |
1820 | * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5. | |
52666986 JPM |
1821 | */ |
1822 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1823 | struct sk_buff_head *xmitq) | |
1824 | { | |
1825 | struct tipc_msg *hdr = buf_msg(skb); | |
1826 | u32 dnode = msg_destnode(hdr); | |
1827 | int mtyp = msg_type(hdr); | |
1828 | u16 acked = msg_bcast_ack(hdr); | |
1829 | u16 from = acked + 1; | |
1830 | u16 to = msg_bcgap_to(hdr); | |
1831 | u16 peers_snd_nxt = to + 1; | |
1832 | int rc = 0; | |
1833 | ||
1834 | kfree_skb(skb); | |
1835 | ||
1836 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
1837 | return 0; | |
1838 | ||
1839 | if (mtyp != STATE_MSG) | |
1840 | return 0; | |
1841 | ||
e74a386d | 1842 | if (dnode == tipc_own_addr(l->net)) { |
52666986 | 1843 | tipc_link_bc_ack_rcv(l, acked, xmitq); |
40501f90 | 1844 | rc = tipc_link_retrans(l->bc_sndlink, l, from, to, xmitq); |
52666986 JPM |
1845 | l->stats.recv_nacks++; |
1846 | return rc; | |
1847 | } | |
1848 | ||
1849 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
1850 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
1851 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1852 | ||
1853 | return 0; | |
1854 | } | |
1855 | ||
e3eea1eb | 1856 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1857 | { |
218527fe | 1858 | int max_bulk = TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1859 | |
1860 | l->window = win; | |
5a0950c2 JPM |
1861 | l->backlog[TIPC_LOW_IMPORTANCE].limit = max_t(u16, 50, win); |
1862 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = max_t(u16, 100, win * 2); | |
1863 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = max_t(u16, 150, win * 3); | |
1864 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = max_t(u16, 200, win * 4); | |
1f66d161 | 1865 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; |
b97bf3fd PL |
1866 | } |
1867 | ||
b97bf3fd | 1868 | /** |
38206d59 | 1869 | * link_reset_stats - reset link statistics |
1a90632d | 1870 | * @l: pointer to link |
b97bf3fd | 1871 | */ |
38206d59 | 1872 | void tipc_link_reset_stats(struct tipc_link *l) |
b97bf3fd | 1873 | { |
38206d59 | 1874 | memset(&l->stats, 0, sizeof(l->stats)); |
b97bf3fd PL |
1875 | } |
1876 | ||
1a20cc25 | 1877 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 1878 | { |
1a20cc25 | 1879 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 1880 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 1881 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 1882 | |
662921cd | 1883 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
1884 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
1885 | skb_queue_len(&l->transmq), head, tail, | |
1886 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 1887 | } |
0655f6a8 RA |
1888 | |
1889 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1890 | */ | |
1891 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1892 | { | |
1893 | int err; | |
1894 | ||
1895 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
fceb6435 | 1896 | tipc_nl_prop_policy, NULL); |
0655f6a8 RA |
1897 | if (err) |
1898 | return err; | |
1899 | ||
1900 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1901 | u32 prio; | |
1902 | ||
1903 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1904 | if (prio > TIPC_MAX_LINK_PRI) | |
1905 | return -EINVAL; | |
1906 | } | |
1907 | ||
1908 | if (props[TIPC_NLA_PROP_TOL]) { | |
1909 | u32 tol; | |
1910 | ||
1911 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1912 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1913 | return -EINVAL; | |
1914 | } | |
1915 | ||
1916 | if (props[TIPC_NLA_PROP_WIN]) { | |
1917 | u32 win; | |
1918 | ||
1919 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1920 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1921 | return -EINVAL; | |
1922 | } | |
1923 | ||
1924 | return 0; | |
1925 | } | |
7be57fc6 | 1926 | |
d8182804 | 1927 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
7be57fc6 RA |
1928 | { |
1929 | int i; | |
1930 | struct nlattr *stats; | |
1931 | ||
1932 | struct nla_map { | |
1933 | u32 key; | |
1934 | u32 val; | |
1935 | }; | |
1936 | ||
1937 | struct nla_map map[] = { | |
95901122 | 1938 | {TIPC_NLA_STATS_RX_INFO, 0}, |
7be57fc6 RA |
1939 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, |
1940 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1941 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1942 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
95901122 | 1943 | {TIPC_NLA_STATS_TX_INFO, 0}, |
7be57fc6 RA |
1944 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, |
1945 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1946 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1947 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1948 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1949 | s->msg_length_counts : 1}, | |
1950 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1951 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1952 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1953 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1954 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1955 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1956 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1957 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1958 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1959 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1960 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1961 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1962 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1963 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1964 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1965 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1966 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1967 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1968 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1969 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1970 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1971 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1972 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1973 | }; | |
1974 | ||
1975 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1976 | if (!stats) | |
1977 | return -EMSGSIZE; | |
1978 | ||
1979 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1980 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1981 | goto msg_full; | |
1982 | ||
1983 | nla_nest_end(skb, stats); | |
1984 | ||
1985 | return 0; | |
1986 | msg_full: | |
1987 | nla_nest_cancel(skb, stats); | |
1988 | ||
1989 | return -EMSGSIZE; | |
1990 | } | |
1991 | ||
1992 | /* Caller should hold appropriate locks to protect the link */ | |
5be9c086 JPM |
1993 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
1994 | struct tipc_link *link, int nlflags) | |
7be57fc6 | 1995 | { |
23fd3eac | 1996 | u32 self = tipc_own_addr(net); |
7be57fc6 RA |
1997 | struct nlattr *attrs; |
1998 | struct nlattr *prop; | |
23fd3eac JM |
1999 | void *hdr; |
2000 | int err; | |
7be57fc6 | 2001 | |
bfb3e5dd | 2002 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 2003 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
2004 | if (!hdr) |
2005 | return -EMSGSIZE; | |
2006 | ||
2007 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2008 | if (!attrs) | |
2009 | goto msg_full; | |
2010 | ||
2011 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2012 | goto attr_msg_full; | |
23fd3eac | 2013 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, tipc_cluster_mask(self))) |
7be57fc6 | 2014 | goto attr_msg_full; |
ed193ece | 2015 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 2016 | goto attr_msg_full; |
95901122 | 2017 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts)) |
7be57fc6 | 2018 | goto attr_msg_full; |
95901122 | 2019 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts)) |
7be57fc6 RA |
2020 | goto attr_msg_full; |
2021 | ||
2022 | if (tipc_link_is_up(link)) | |
2023 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2024 | goto attr_msg_full; | |
c72fa872 | 2025 | if (link->active) |
7be57fc6 RA |
2026 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
2027 | goto attr_msg_full; | |
2028 | ||
2029 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2030 | if (!prop) | |
2031 | goto attr_msg_full; | |
2032 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2033 | goto prop_msg_full; | |
2034 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2035 | goto prop_msg_full; | |
2036 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 2037 | link->window)) |
7be57fc6 RA |
2038 | goto prop_msg_full; |
2039 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2040 | goto prop_msg_full; | |
2041 | nla_nest_end(msg->skb, prop); | |
2042 | ||
2043 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2044 | if (err) | |
2045 | goto attr_msg_full; | |
2046 | ||
2047 | nla_nest_end(msg->skb, attrs); | |
2048 | genlmsg_end(msg->skb, hdr); | |
2049 | ||
2050 | return 0; | |
2051 | ||
2052 | prop_msg_full: | |
2053 | nla_nest_cancel(msg->skb, prop); | |
2054 | attr_msg_full: | |
2055 | nla_nest_cancel(msg->skb, attrs); | |
2056 | msg_full: | |
2057 | genlmsg_cancel(msg->skb, hdr); | |
2058 | ||
2059 | return -EMSGSIZE; | |
2060 | } | |
38206d59 JPM |
2061 | |
2062 | static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, | |
2063 | struct tipc_stats *stats) | |
2064 | { | |
2065 | int i; | |
2066 | struct nlattr *nest; | |
2067 | ||
2068 | struct nla_map { | |
2069 | __u32 key; | |
2070 | __u32 val; | |
2071 | }; | |
2072 | ||
2073 | struct nla_map map[] = { | |
95901122 | 2074 | {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts}, |
38206d59 JPM |
2075 | {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, |
2076 | {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, | |
2077 | {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, | |
2078 | {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, | |
95901122 | 2079 | {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts}, |
38206d59 JPM |
2080 | {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, |
2081 | {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, | |
2082 | {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, | |
2083 | {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, | |
2084 | {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, | |
2085 | {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, | |
2086 | {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, | |
2087 | {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, | |
2088 | {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, | |
2089 | {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, | |
2090 | {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, | |
2091 | {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, | |
2092 | {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? | |
2093 | (stats->accu_queue_sz / stats->queue_sz_counts) : 0} | |
2094 | }; | |
2095 | ||
2096 | nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
2097 | if (!nest) | |
2098 | return -EMSGSIZE; | |
2099 | ||
2100 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2101 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2102 | goto msg_full; | |
2103 | ||
2104 | nla_nest_end(skb, nest); | |
2105 | ||
2106 | return 0; | |
2107 | msg_full: | |
2108 | nla_nest_cancel(skb, nest); | |
2109 | ||
2110 | return -EMSGSIZE; | |
2111 | } | |
2112 | ||
2113 | int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg) | |
2114 | { | |
2115 | int err; | |
2116 | void *hdr; | |
2117 | struct nlattr *attrs; | |
2118 | struct nlattr *prop; | |
2119 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
2120 | struct tipc_link *bcl = tn->bcl; | |
2121 | ||
2122 | if (!bcl) | |
2123 | return 0; | |
2124 | ||
2125 | tipc_bcast_lock(net); | |
2126 | ||
2127 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, | |
2128 | NLM_F_MULTI, TIPC_NL_LINK_GET); | |
b53ce3e7 IY |
2129 | if (!hdr) { |
2130 | tipc_bcast_unlock(net); | |
38206d59 | 2131 | return -EMSGSIZE; |
b53ce3e7 | 2132 | } |
38206d59 JPM |
2133 | |
2134 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2135 | if (!attrs) | |
2136 | goto msg_full; | |
2137 | ||
2138 | /* The broadcast link is always up */ | |
2139 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2140 | goto attr_msg_full; | |
2141 | ||
2142 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) | |
2143 | goto attr_msg_full; | |
2144 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) | |
2145 | goto attr_msg_full; | |
95901122 | 2146 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0)) |
38206d59 | 2147 | goto attr_msg_full; |
95901122 | 2148 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0)) |
38206d59 JPM |
2149 | goto attr_msg_full; |
2150 | ||
2151 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2152 | if (!prop) | |
2153 | goto attr_msg_full; | |
2154 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window)) | |
2155 | goto prop_msg_full; | |
2156 | nla_nest_end(msg->skb, prop); | |
2157 | ||
2158 | err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); | |
2159 | if (err) | |
2160 | goto attr_msg_full; | |
2161 | ||
2162 | tipc_bcast_unlock(net); | |
2163 | nla_nest_end(msg->skb, attrs); | |
2164 | genlmsg_end(msg->skb, hdr); | |
2165 | ||
2166 | return 0; | |
2167 | ||
2168 | prop_msg_full: | |
2169 | nla_nest_cancel(msg->skb, prop); | |
2170 | attr_msg_full: | |
2171 | nla_nest_cancel(msg->skb, attrs); | |
2172 | msg_full: | |
2173 | tipc_bcast_unlock(net); | |
2174 | genlmsg_cancel(msg->skb, hdr); | |
2175 | ||
2176 | return -EMSGSIZE; | |
2177 | } | |
2178 | ||
d01332f1 RA |
2179 | void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, |
2180 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2181 | { |
2182 | l->tolerance = tol; | |
37c64cf6 JM |
2183 | if (link_is_up(l)) |
2184 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, tol, 0, xmitq); | |
38206d59 JPM |
2185 | } |
2186 | ||
d01332f1 RA |
2187 | void tipc_link_set_prio(struct tipc_link *l, u32 prio, |
2188 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2189 | { |
2190 | l->priority = prio; | |
8d6e79d3 | 2191 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, prio, xmitq); |
38206d59 JPM |
2192 | } |
2193 | ||
2194 | void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) | |
2195 | { | |
2196 | l->abort_limit = limit; | |
2197 | } |