]>
Commit | Line | Data |
---|---|---|
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" |
b4b9771b | 46 | #include "trace.h" |
fc1b6d6d | 47 | #include "crypto.h" |
b97bf3fd | 48 | |
796c75d0 YX |
49 | #include <linux/pkt_sched.h> |
50 | ||
38206d59 | 51 | struct tipc_stats { |
95901122 JPM |
52 | u32 sent_pkts; |
53 | u32 recv_pkts; | |
38206d59 JPM |
54 | u32 sent_states; |
55 | u32 recv_states; | |
56 | u32 sent_probes; | |
57 | u32 recv_probes; | |
58 | u32 sent_nacks; | |
59 | u32 recv_nacks; | |
60 | u32 sent_acks; | |
61 | u32 sent_bundled; | |
62 | u32 sent_bundles; | |
63 | u32 recv_bundled; | |
64 | u32 recv_bundles; | |
65 | u32 retransmitted; | |
66 | u32 sent_fragmented; | |
67 | u32 sent_fragments; | |
68 | u32 recv_fragmented; | |
69 | u32 recv_fragments; | |
70 | u32 link_congs; /* # port sends blocked by congestion */ | |
71 | u32 deferred_recv; | |
72 | u32 duplicates; | |
73 | u32 max_queue_sz; /* send queue size high water mark */ | |
74 | u32 accu_queue_sz; /* used for send queue size profiling */ | |
75 | u32 queue_sz_counts; /* used for send queue size profiling */ | |
76 | u32 msg_length_counts; /* used for message length profiling */ | |
77 | u32 msg_lengths_total; /* used for message length profiling */ | |
78 | u32 msg_length_profile[7]; /* used for msg. length profiling */ | |
79 | }; | |
80 | ||
81 | /** | |
82 | * struct tipc_link - TIPC link data structure | |
83 | * @addr: network address of link's peer node | |
84 | * @name: link name character string | |
85 | * @media_addr: media address to use when sending messages over link | |
86 | * @timer: link timer | |
87 | * @net: pointer to namespace struct | |
88 | * @refcnt: reference counter for permanent references (owner node & timer) | |
89 | * @peer_session: link session # being used by peer end of link | |
90 | * @peer_bearer_id: bearer id used by link's peer endpoint | |
91 | * @bearer_id: local bearer id used by link | |
92 | * @tolerance: minimum link continuity loss needed to reset link [in ms] | |
38206d59 JPM |
93 | * @abort_limit: # of unacknowledged continuity probes needed to reset link |
94 | * @state: current state of link FSM | |
95 | * @peer_caps: bitmap describing capabilities of peer node | |
96 | * @silent_intv_cnt: # of timer intervals without any reception from peer | |
97 | * @proto_msg: template for control messages generated by link | |
98 | * @pmsg: convenience pointer to "proto_msg" field | |
99 | * @priority: current link priority | |
100 | * @net_plane: current link network plane ('A' through 'H') | |
35c55c98 | 101 | * @mon_state: cookie with information needed by link monitor |
38206d59 JPM |
102 | * @backlog_limit: backlog queue congestion thresholds (indexed by importance) |
103 | * @exp_msg_count: # of tunnelled messages expected during link changeover | |
104 | * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset | |
105 | * @mtu: current maximum packet size for this link | |
106 | * @advertised_mtu: advertised own mtu when link is being established | |
107 | * @transmitq: queue for sent, non-acked messages | |
108 | * @backlogq: queue for messages waiting to be sent | |
109 | * @snt_nxt: next sequence number to use for outbound messages | |
38206d59 JPM |
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 */ | |
7ea817f4 JM |
130 | u16 peer_session; |
131 | u16 session; | |
9012de50 JM |
132 | u16 snd_nxt_state; |
133 | u16 rcv_nxt_state; | |
38206d59 JPM |
134 | u32 peer_bearer_id; |
135 | u32 bearer_id; | |
136 | u32 tolerance; | |
38206d59 JPM |
137 | u32 abort_limit; |
138 | u32 state; | |
139 | u16 peer_caps; | |
7ea817f4 | 140 | bool in_session; |
38206d59 JPM |
141 | bool active; |
142 | u32 silent_intv_cnt; | |
e74a386d | 143 | char if_name[TIPC_MAX_IF_NAME]; |
38206d59 JPM |
144 | u32 priority; |
145 | char net_plane; | |
35c55c98 | 146 | struct tipc_mon_state mon_state; |
88e8ac70 | 147 | u16 rst_cnt; |
38206d59 JPM |
148 | |
149 | /* Failover/synch */ | |
150 | u16 drop_point; | |
151 | struct sk_buff *failover_reasm_skb; | |
58ee86b8 | 152 | struct sk_buff_head failover_deferdq; |
38206d59 JPM |
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; | |
e95584a8 | 164 | struct sk_buff *target_bskb; |
38206d59 JPM |
165 | } backlog[5]; |
166 | u16 snd_nxt; | |
38206d59 | 167 | u16 window; |
38206d59 JPM |
168 | |
169 | /* Reception */ | |
170 | u16 rcv_nxt; | |
171 | u32 rcv_unacked; | |
172 | struct sk_buff_head deferdq; | |
173 | struct sk_buff_head *inputq; | |
174 | struct sk_buff_head *namedq; | |
175 | ||
176 | /* Congestion handling */ | |
177 | struct sk_buff_head wakeupq; | |
178 | ||
179 | /* Fragmentation/reassembly */ | |
180 | struct sk_buff *reasm_buf; | |
2320bcda | 181 | struct sk_buff *reasm_tnlmsg; |
38206d59 JPM |
182 | |
183 | /* Broadcast */ | |
184 | u16 ackers; | |
185 | u16 acked; | |
186 | struct tipc_link *bc_rcvlink; | |
187 | struct tipc_link *bc_sndlink; | |
7c4a54b9 | 188 | u8 nack_state; |
38206d59 JPM |
189 | bool bc_peer_is_up; |
190 | ||
191 | /* Statistics */ | |
192 | struct tipc_stats stats; | |
193 | }; | |
194 | ||
2cf8aa19 EH |
195 | /* |
196 | * Error message prefixes | |
197 | */ | |
6e498158 | 198 | static const char *link_co_err = "Link tunneling error, "; |
2cf8aa19 | 199 | static const char *link_rst_msg = "Resetting link "; |
7be57fc6 | 200 | |
52666986 JPM |
201 | /* Send states for broadcast NACKs |
202 | */ | |
203 | enum { | |
204 | BC_NACK_SND_CONDITIONAL, | |
205 | BC_NACK_SND_UNCONDITIONAL, | |
206 | BC_NACK_SND_SUPPRESS, | |
207 | }; | |
208 | ||
53962bce | 209 | #define TIPC_BC_RETR_LIM (jiffies + msecs_to_jiffies(10)) |
382f598f | 210 | #define TIPC_UC_RETR_TIME (jiffies + msecs_to_jiffies(1)) |
7c4a54b9 | 211 | |
d999297c JPM |
212 | /* |
213 | * Interval between NACKs when packets arrive out of order | |
214 | */ | |
215 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
e74a386d | 216 | |
662921cd | 217 | /* Link FSM states: |
b97bf3fd | 218 | */ |
d3504c34 | 219 | enum { |
662921cd JPM |
220 | LINK_ESTABLISHED = 0xe, |
221 | LINK_ESTABLISHING = 0xe << 4, | |
222 | LINK_RESET = 0x1 << 8, | |
223 | LINK_RESETTING = 0x2 << 12, | |
224 | LINK_PEER_RESET = 0xd << 16, | |
225 | LINK_FAILINGOVER = 0xf << 20, | |
226 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
227 | }; |
228 | ||
229 | /* Link FSM state checking routines | |
230 | */ | |
662921cd | 231 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 232 | { |
662921cd | 233 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 234 | } |
b97bf3fd | 235 | |
d999297c JPM |
236 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
237 | struct sk_buff_head *xmitq); | |
426cc2b8 | 238 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
239 | bool probe_reply, u16 rcvgap, |
240 | int tolerance, int priority, | |
426cc2b8 | 241 | struct sk_buff_head *xmitq); |
1a90632d | 242 | static void link_print(struct tipc_link *l, const char *str); |
e0a05ebe JPM |
243 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
244 | struct sk_buff_head *xmitq); | |
52666986 JPM |
245 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
246 | struct sk_buff_head *xmitq); | |
247 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 to); | |
9195948f | 248 | static u16 tipc_build_gap_ack_blks(struct tipc_link *l, void *data); |
6a6b5c8b TL |
249 | static int tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap, |
250 | struct tipc_gap_ack_blks *ga, | |
251 | struct sk_buff_head *xmitq); | |
8b4ed863 | 252 | |
b97bf3fd | 253 | /* |
05790c64 | 254 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 255 | */ |
662921cd | 256 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 257 | { |
662921cd JPM |
258 | return link_is_up(l); |
259 | } | |
260 | ||
c8199300 JPM |
261 | bool tipc_link_peer_is_down(struct tipc_link *l) |
262 | { | |
263 | return l->state == LINK_PEER_RESET; | |
264 | } | |
265 | ||
662921cd JPM |
266 | bool tipc_link_is_reset(struct tipc_link *l) |
267 | { | |
268 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
269 | } | |
270 | ||
73f646ce JPM |
271 | bool tipc_link_is_establishing(struct tipc_link *l) |
272 | { | |
273 | return l->state == LINK_ESTABLISHING; | |
274 | } | |
275 | ||
662921cd JPM |
276 | bool tipc_link_is_synching(struct tipc_link *l) |
277 | { | |
278 | return l->state == LINK_SYNCHING; | |
279 | } | |
280 | ||
281 | bool tipc_link_is_failingover(struct tipc_link *l) | |
282 | { | |
283 | return l->state == LINK_FAILINGOVER; | |
284 | } | |
285 | ||
286 | bool tipc_link_is_blocked(struct tipc_link *l) | |
287 | { | |
288 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
289 | } |
290 | ||
742e0383 | 291 | static bool link_is_bc_sndlink(struct tipc_link *l) |
52666986 JPM |
292 | { |
293 | return !l->bc_sndlink; | |
294 | } | |
295 | ||
742e0383 | 296 | static bool link_is_bc_rcvlink(struct tipc_link *l) |
52666986 JPM |
297 | { |
298 | return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); | |
299 | } | |
300 | ||
c72fa872 JPM |
301 | void tipc_link_set_active(struct tipc_link *l, bool active) |
302 | { | |
303 | l->active = active; | |
b97bf3fd PL |
304 | } |
305 | ||
38206d59 JPM |
306 | u32 tipc_link_id(struct tipc_link *l) |
307 | { | |
308 | return l->peer_bearer_id << 16 | l->bearer_id; | |
309 | } | |
310 | ||
311 | int tipc_link_window(struct tipc_link *l) | |
312 | { | |
313 | return l->window; | |
314 | } | |
315 | ||
316 | int tipc_link_prio(struct tipc_link *l) | |
317 | { | |
318 | return l->priority; | |
319 | } | |
320 | ||
321 | unsigned long tipc_link_tolerance(struct tipc_link *l) | |
322 | { | |
323 | return l->tolerance; | |
324 | } | |
325 | ||
326 | struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) | |
327 | { | |
328 | return l->inputq; | |
329 | } | |
330 | ||
331 | char tipc_link_plane(struct tipc_link *l) | |
332 | { | |
333 | return l->net_plane; | |
334 | } | |
335 | ||
9012de50 JM |
336 | void tipc_link_update_caps(struct tipc_link *l, u16 capabilities) |
337 | { | |
338 | l->peer_caps = capabilities; | |
339 | } | |
340 | ||
52666986 JPM |
341 | void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
342 | struct tipc_link *uc_l, | |
343 | struct sk_buff_head *xmitq) | |
2f566124 | 344 | { |
52666986 JPM |
345 | struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
346 | ||
347 | snd_l->ackers++; | |
348 | rcv_l->acked = snd_l->snd_nxt - 1; | |
9a650838 | 349 | snd_l->state = LINK_ESTABLISHED; |
52666986 | 350 | tipc_link_build_bc_init_msg(uc_l, xmitq); |
2f566124 JPM |
351 | } |
352 | ||
52666986 JPM |
353 | void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
354 | struct tipc_link *rcv_l, | |
355 | struct sk_buff_head *xmitq) | |
2f566124 | 356 | { |
52666986 JPM |
357 | u16 ack = snd_l->snd_nxt - 1; |
358 | ||
359 | snd_l->ackers--; | |
a71eb720 JPM |
360 | rcv_l->bc_peer_is_up = true; |
361 | rcv_l->state = LINK_ESTABLISHED; | |
52666986 | 362 | tipc_link_bc_ack_rcv(rcv_l, ack, xmitq); |
26574db0 | 363 | trace_tipc_link_reset(rcv_l, TIPC_DUMP_ALL, "bclink removed!"); |
52666986 JPM |
364 | tipc_link_reset(rcv_l); |
365 | rcv_l->state = LINK_RESET; | |
366 | if (!snd_l->ackers) { | |
26574db0 | 367 | trace_tipc_link_reset(snd_l, TIPC_DUMP_ALL, "zero ackers!"); |
52666986 | 368 | tipc_link_reset(snd_l); |
9a650838 | 369 | snd_l->state = LINK_RESET; |
52666986 JPM |
370 | __skb_queue_purge(xmitq); |
371 | } | |
2f566124 JPM |
372 | } |
373 | ||
374 | int tipc_link_bc_peers(struct tipc_link *l) | |
375 | { | |
376 | return l->ackers; | |
377 | } | |
378 | ||
e064cce1 | 379 | static u16 link_bc_rcv_gap(struct tipc_link *l) |
02d11ca2 JPM |
380 | { |
381 | struct sk_buff *skb = skb_peek(&l->deferdq); | |
382 | u16 gap = 0; | |
383 | ||
384 | if (more(l->snd_nxt, l->rcv_nxt)) | |
385 | gap = l->snd_nxt - l->rcv_nxt; | |
386 | if (skb) | |
387 | gap = buf_seqno(skb) - l->rcv_nxt; | |
388 | return gap; | |
389 | } | |
390 | ||
959e1781 JPM |
391 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
392 | { | |
393 | l->mtu = mtu; | |
394 | } | |
395 | ||
396 | int tipc_link_mtu(struct tipc_link *l) | |
397 | { | |
398 | return l->mtu; | |
399 | } | |
400 | ||
fc1b6d6d TL |
401 | int tipc_link_mss(struct tipc_link *l) |
402 | { | |
403 | #ifdef CONFIG_TIPC_CRYPTO | |
404 | return l->mtu - INT_H_SIZE - EMSG_OVERHEAD; | |
405 | #else | |
406 | return l->mtu - INT_H_SIZE; | |
407 | #endif | |
408 | } | |
409 | ||
38206d59 JPM |
410 | u16 tipc_link_rcv_nxt(struct tipc_link *l) |
411 | { | |
412 | return l->rcv_nxt; | |
413 | } | |
414 | ||
415 | u16 tipc_link_acked(struct tipc_link *l) | |
416 | { | |
417 | return l->acked; | |
418 | } | |
419 | ||
420 | char *tipc_link_name(struct tipc_link *l) | |
421 | { | |
422 | return l->name; | |
423 | } | |
424 | ||
c140eb16 LDC |
425 | u32 tipc_link_state(struct tipc_link *l) |
426 | { | |
427 | return l->state; | |
428 | } | |
429 | ||
b97bf3fd | 430 | /** |
4323add6 | 431 | * tipc_link_create - create a new link |
440d8963 | 432 | * @n: pointer to associated node |
0e05498e JPM |
433 | * @if_name: associated interface name |
434 | * @bearer_id: id (index) of associated bearer | |
435 | * @tolerance: link tolerance to be used by link | |
436 | * @net_plane: network plane (A,B,c..) this link belongs to | |
437 | * @mtu: mtu to be advertised by link | |
438 | * @priority: priority to be used by link | |
439 | * @window: send window to be used by link | |
440 | * @session: session to be used by link | |
440d8963 | 441 | * @ownnode: identity of own node |
0e05498e | 442 | * @peer: node id of peer node |
fd556f20 | 443 | * @peer_caps: bitmap describing peer node capabilities |
52666986 JPM |
444 | * @bc_sndlink: the namespace global link used for broadcast sending |
445 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
440d8963 JPM |
446 | * @inputq: queue to put messages ready for delivery |
447 | * @namedq: queue to put binding table update messages ready for delivery | |
448 | * @link: return value, pointer to put the created link | |
c4307285 | 449 | * |
440d8963 | 450 | * Returns true if link was created, otherwise false |
b97bf3fd | 451 | */ |
c72fa872 | 452 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
0e05498e | 453 | int tolerance, char net_plane, u32 mtu, int priority, |
25b0b9c4 JM |
454 | int window, u32 session, u32 self, |
455 | u32 peer, u8 *peer_id, u16 peer_caps, | |
52666986 JPM |
456 | struct tipc_link *bc_sndlink, |
457 | struct tipc_link *bc_rcvlink, | |
458 | struct sk_buff_head *inputq, | |
459 | struct sk_buff_head *namedq, | |
440d8963 | 460 | struct tipc_link **link) |
b97bf3fd | 461 | { |
25b0b9c4 JM |
462 | char peer_str[NODE_ID_STR_LEN] = {0,}; |
463 | char self_str[NODE_ID_STR_LEN] = {0,}; | |
440d8963 | 464 | struct tipc_link *l; |
37b9c08a | 465 | |
440d8963 JPM |
466 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
467 | if (!l) | |
468 | return false; | |
469 | *link = l; | |
e74a386d | 470 | l->session = session; |
37b9c08a | 471 | |
25b0b9c4 JM |
472 | /* Set link name for unicast links only */ |
473 | if (peer_id) { | |
474 | tipc_nodeid2string(self_str, tipc_own_id(net)); | |
475 | if (strlen(self_str) > 16) | |
476 | sprintf(self_str, "%x", self); | |
477 | tipc_nodeid2string(peer_str, peer_id); | |
478 | if (strlen(peer_str) > 16) | |
479 | sprintf(peer_str, "%x", peer); | |
480 | } | |
481 | /* Peer i/f name will be completed by reset/activate message */ | |
7494cfa6 JM |
482 | snprintf(l->name, sizeof(l->name), "%s:%s-%s:unknown", |
483 | self_str, if_name, peer_str); | |
25b0b9c4 | 484 | |
e74a386d | 485 | strcpy(l->if_name, if_name); |
440d8963 | 486 | l->addr = peer; |
fd556f20 | 487 | l->peer_caps = peer_caps; |
c72fa872 | 488 | l->net = net; |
7ea817f4 | 489 | l->in_session = false; |
0e05498e JPM |
490 | l->bearer_id = bearer_id; |
491 | l->tolerance = tolerance; | |
047491ea JM |
492 | if (bc_rcvlink) |
493 | bc_rcvlink->tolerance = tolerance; | |
0e05498e JPM |
494 | l->net_plane = net_plane; |
495 | l->advertised_mtu = mtu; | |
496 | l->mtu = mtu; | |
497 | l->priority = priority; | |
498 | tipc_link_set_queue_limits(l, window); | |
c1ab3f1d | 499 | l->ackers = 1; |
52666986 JPM |
500 | l->bc_sndlink = bc_sndlink; |
501 | l->bc_rcvlink = bc_rcvlink; | |
440d8963 JPM |
502 | l->inputq = inputq; |
503 | l->namedq = namedq; | |
504 | l->state = LINK_RESETTING; | |
440d8963 JPM |
505 | __skb_queue_head_init(&l->transmq); |
506 | __skb_queue_head_init(&l->backlogq); | |
507 | __skb_queue_head_init(&l->deferdq); | |
58ee86b8 | 508 | __skb_queue_head_init(&l->failover_deferdq); |
440d8963 JPM |
509 | skb_queue_head_init(&l->wakeupq); |
510 | skb_queue_head_init(l->inputq); | |
511 | return true; | |
b97bf3fd PL |
512 | } |
513 | ||
32301906 JPM |
514 | /** |
515 | * tipc_link_bc_create - create new link to be used for broadcast | |
516 | * @n: pointer to associated node | |
4c94cc2d | 517 | * @mtu: mtu to be used initially if no peers |
32301906 JPM |
518 | * @window: send window to be used |
519 | * @inputq: queue to put messages ready for delivery | |
520 | * @namedq: queue to put binding table update messages ready for delivery | |
521 | * @link: return value, pointer to put the created link | |
522 | * | |
523 | * Returns true if link was created, otherwise false | |
524 | */ | |
c72fa872 | 525 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, |
52666986 | 526 | int mtu, int window, u16 peer_caps, |
32301906 JPM |
527 | struct sk_buff_head *inputq, |
528 | struct sk_buff_head *namedq, | |
52666986 | 529 | struct tipc_link *bc_sndlink, |
32301906 JPM |
530 | struct tipc_link **link) |
531 | { | |
532 | struct tipc_link *l; | |
533 | ||
c72fa872 | 534 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, |
25b0b9c4 | 535 | 0, ownnode, peer, NULL, peer_caps, bc_sndlink, |
52666986 | 536 | NULL, inputq, namedq, link)) |
32301906 JPM |
537 | return false; |
538 | ||
539 | l = *link; | |
540 | strcpy(l->name, tipc_bclink_name); | |
26574db0 | 541 | trace_tipc_link_reset(l, TIPC_DUMP_ALL, "bclink created!"); |
32301906 | 542 | tipc_link_reset(l); |
52666986 | 543 | l->state = LINK_RESET; |
2f566124 | 544 | l->ackers = 0; |
52666986 | 545 | l->bc_rcvlink = l; |
32301906 | 546 | |
52666986 JPM |
547 | /* Broadcast send link is always up */ |
548 | if (link_is_bc_sndlink(l)) | |
549 | l->state = LINK_ESTABLISHED; | |
d999297c | 550 | |
01fd12bb JPM |
551 | /* Disable replicast if even a single peer doesn't support it */ |
552 | if (link_is_bc_rcvlink(l) && !(peer_caps & TIPC_BCAST_RCAST)) | |
ba5f6a86 | 553 | tipc_bcast_toggle_rcast(net, false); |
01fd12bb | 554 | |
52666986 | 555 | return true; |
d999297c JPM |
556 | } |
557 | ||
6ab30f9c JPM |
558 | /** |
559 | * tipc_link_fsm_evt - link finite state machine | |
560 | * @l: pointer to link | |
561 | * @evt: state machine event to be processed | |
6ab30f9c | 562 | */ |
662921cd | 563 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 564 | { |
5045f7b9 | 565 | int rc = 0; |
26574db0 | 566 | int old_state = l->state; |
6ab30f9c JPM |
567 | |
568 | switch (l->state) { | |
662921cd | 569 | case LINK_RESETTING: |
6ab30f9c | 570 | switch (evt) { |
662921cd JPM |
571 | case LINK_PEER_RESET_EVT: |
572 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 573 | break; |
662921cd JPM |
574 | case LINK_RESET_EVT: |
575 | l->state = LINK_RESET; | |
576 | break; | |
577 | case LINK_FAILURE_EVT: | |
578 | case LINK_FAILOVER_BEGIN_EVT: | |
579 | case LINK_ESTABLISH_EVT: | |
580 | case LINK_FAILOVER_END_EVT: | |
581 | case LINK_SYNCH_BEGIN_EVT: | |
582 | case LINK_SYNCH_END_EVT: | |
583 | default: | |
584 | goto illegal_evt; | |
585 | } | |
586 | break; | |
587 | case LINK_RESET: | |
588 | switch (evt) { | |
589 | case LINK_PEER_RESET_EVT: | |
590 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 591 | break; |
662921cd JPM |
592 | case LINK_FAILOVER_BEGIN_EVT: |
593 | l->state = LINK_FAILINGOVER; | |
594 | case LINK_FAILURE_EVT: | |
595 | case LINK_RESET_EVT: | |
596 | case LINK_ESTABLISH_EVT: | |
597 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 598 | break; |
662921cd JPM |
599 | case LINK_SYNCH_BEGIN_EVT: |
600 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 601 | default: |
662921cd | 602 | goto illegal_evt; |
6ab30f9c JPM |
603 | } |
604 | break; | |
662921cd | 605 | case LINK_PEER_RESET: |
6ab30f9c | 606 | switch (evt) { |
662921cd JPM |
607 | case LINK_RESET_EVT: |
608 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 609 | break; |
662921cd JPM |
610 | case LINK_PEER_RESET_EVT: |
611 | case LINK_ESTABLISH_EVT: | |
612 | case LINK_FAILURE_EVT: | |
6ab30f9c | 613 | break; |
662921cd JPM |
614 | case LINK_SYNCH_BEGIN_EVT: |
615 | case LINK_SYNCH_END_EVT: | |
616 | case LINK_FAILOVER_BEGIN_EVT: | |
617 | case LINK_FAILOVER_END_EVT: | |
618 | default: | |
619 | goto illegal_evt; | |
620 | } | |
621 | break; | |
622 | case LINK_FAILINGOVER: | |
623 | switch (evt) { | |
624 | case LINK_FAILOVER_END_EVT: | |
625 | l->state = LINK_RESET; | |
6ab30f9c | 626 | break; |
662921cd JPM |
627 | case LINK_PEER_RESET_EVT: |
628 | case LINK_RESET_EVT: | |
629 | case LINK_ESTABLISH_EVT: | |
630 | case LINK_FAILURE_EVT: | |
631 | break; | |
632 | case LINK_FAILOVER_BEGIN_EVT: | |
633 | case LINK_SYNCH_BEGIN_EVT: | |
634 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 635 | default: |
662921cd | 636 | goto illegal_evt; |
6ab30f9c JPM |
637 | } |
638 | break; | |
662921cd | 639 | case LINK_ESTABLISHING: |
6ab30f9c | 640 | switch (evt) { |
662921cd JPM |
641 | case LINK_ESTABLISH_EVT: |
642 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 643 | break; |
662921cd JPM |
644 | case LINK_FAILOVER_BEGIN_EVT: |
645 | l->state = LINK_FAILINGOVER; | |
646 | break; | |
662921cd | 647 | case LINK_RESET_EVT: |
73f646ce JPM |
648 | l->state = LINK_RESET; |
649 | break; | |
662921cd | 650 | case LINK_FAILURE_EVT: |
73f646ce | 651 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
652 | case LINK_SYNCH_BEGIN_EVT: |
653 | case LINK_FAILOVER_END_EVT: | |
654 | break; | |
655 | case LINK_SYNCH_END_EVT: | |
656 | default: | |
657 | goto illegal_evt; | |
658 | } | |
659 | break; | |
660 | case LINK_ESTABLISHED: | |
661 | switch (evt) { | |
662 | case LINK_PEER_RESET_EVT: | |
663 | l->state = LINK_PEER_RESET; | |
664 | rc |= TIPC_LINK_DOWN_EVT; | |
665 | break; | |
666 | case LINK_FAILURE_EVT: | |
667 | l->state = LINK_RESETTING; | |
668 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 669 | break; |
662921cd JPM |
670 | case LINK_RESET_EVT: |
671 | l->state = LINK_RESET; | |
6ab30f9c | 672 | break; |
662921cd | 673 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 674 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 675 | break; |
662921cd JPM |
676 | case LINK_SYNCH_BEGIN_EVT: |
677 | l->state = LINK_SYNCHING; | |
678 | break; | |
662921cd JPM |
679 | case LINK_FAILOVER_BEGIN_EVT: |
680 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 681 | default: |
662921cd | 682 | goto illegal_evt; |
6ab30f9c JPM |
683 | } |
684 | break; | |
662921cd | 685 | case LINK_SYNCHING: |
6ab30f9c | 686 | switch (evt) { |
662921cd JPM |
687 | case LINK_PEER_RESET_EVT: |
688 | l->state = LINK_PEER_RESET; | |
689 | rc |= TIPC_LINK_DOWN_EVT; | |
690 | break; | |
691 | case LINK_FAILURE_EVT: | |
692 | l->state = LINK_RESETTING; | |
693 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 694 | break; |
662921cd JPM |
695 | case LINK_RESET_EVT: |
696 | l->state = LINK_RESET; | |
6ab30f9c | 697 | break; |
662921cd JPM |
698 | case LINK_ESTABLISH_EVT: |
699 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 700 | break; |
662921cd JPM |
701 | case LINK_SYNCH_END_EVT: |
702 | l->state = LINK_ESTABLISHED; | |
703 | break; | |
704 | case LINK_FAILOVER_BEGIN_EVT: | |
705 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 706 | default: |
662921cd | 707 | goto illegal_evt; |
6ab30f9c JPM |
708 | } |
709 | break; | |
710 | default: | |
662921cd | 711 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 712 | } |
26574db0 | 713 | trace_tipc_link_fsm(l->name, old_state, l->state, evt); |
662921cd JPM |
714 | return rc; |
715 | illegal_evt: | |
716 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
717 | evt, l->state, l->name); | |
26574db0 | 718 | trace_tipc_link_fsm(l->name, old_state, l->state, evt); |
6ab30f9c JPM |
719 | return rc; |
720 | } | |
721 | ||
333ef69e JPM |
722 | /* link_profile_stats - update statistical profiling of traffic |
723 | */ | |
724 | static void link_profile_stats(struct tipc_link *l) | |
725 | { | |
726 | struct sk_buff *skb; | |
727 | struct tipc_msg *msg; | |
728 | int length; | |
729 | ||
730 | /* Update counters used in statistical profiling of send traffic */ | |
731 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
732 | l->stats.queue_sz_counts++; | |
733 | ||
734 | skb = skb_peek(&l->transmq); | |
735 | if (!skb) | |
736 | return; | |
737 | msg = buf_msg(skb); | |
738 | length = msg_size(msg); | |
739 | ||
740 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
741 | if (msg_type(msg) != FIRST_FRAGMENT) | |
742 | return; | |
a7dc51ad | 743 | length = msg_size(msg_inner_hdr(msg)); |
333ef69e JPM |
744 | } |
745 | l->stats.msg_lengths_total += length; | |
746 | l->stats.msg_length_counts++; | |
747 | if (length <= 64) | |
748 | l->stats.msg_length_profile[0]++; | |
749 | else if (length <= 256) | |
750 | l->stats.msg_length_profile[1]++; | |
751 | else if (length <= 1024) | |
752 | l->stats.msg_length_profile[2]++; | |
753 | else if (length <= 4096) | |
754 | l->stats.msg_length_profile[3]++; | |
755 | else if (length <= 16384) | |
756 | l->stats.msg_length_profile[4]++; | |
757 | else if (length <= 32768) | |
758 | l->stats.msg_length_profile[5]++; | |
759 | else | |
760 | l->stats.msg_length_profile[6]++; | |
761 | } | |
762 | ||
26574db0 TL |
763 | /** |
764 | * tipc_link_too_silent - check if link is "too silent" | |
765 | * @l: tipc link to be checked | |
766 | * | |
767 | * Returns true if the link 'silent_intv_cnt' is about to reach the | |
768 | * 'abort_limit' value, otherwise false | |
769 | */ | |
770 | bool tipc_link_too_silent(struct tipc_link *l) | |
771 | { | |
772 | return (l->silent_intv_cnt + 2 > l->abort_limit); | |
773 | } | |
774 | ||
333ef69e JPM |
775 | /* tipc_link_timeout - perform periodic task as instructed from node timeout |
776 | */ | |
777 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
778 | { | |
c91522f8 YX |
779 | int mtyp = 0; |
780 | int rc = 0; | |
42b18f60 JPM |
781 | bool state = false; |
782 | bool probe = false; | |
783 | bool setup = false; | |
52666986 JPM |
784 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
785 | u16 bc_acked = l->bc_rcvlink->acked; | |
35c55c98 | 786 | struct tipc_mon_state *mstate = &l->mon_state; |
5045f7b9 | 787 | |
26574db0 TL |
788 | trace_tipc_link_timeout(l, TIPC_DUMP_NONE, " "); |
789 | trace_tipc_link_too_silent(l, TIPC_DUMP_ALL, " "); | |
662921cd JPM |
790 | switch (l->state) { |
791 | case LINK_ESTABLISHED: | |
792 | case LINK_SYNCHING: | |
42b18f60 | 793 | mtyp = STATE_MSG; |
35c55c98 JPM |
794 | link_profile_stats(l); |
795 | tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id); | |
796 | if (mstate->reset || (l->silent_intv_cnt > l->abort_limit)) | |
797 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
42b18f60 | 798 | state = bc_acked != bc_snt; |
35c55c98 JPM |
799 | state |= l->bc_rcvlink->rcv_unacked; |
800 | state |= l->rcv_unacked; | |
801 | state |= !skb_queue_empty(&l->transmq); | |
802 | state |= !skb_queue_empty(&l->deferdq); | |
803 | probe = mstate->probing; | |
804 | probe |= l->silent_intv_cnt; | |
805 | if (probe || mstate->monitoring) | |
806 | l->silent_intv_cnt++; | |
662921cd JPM |
807 | break; |
808 | case LINK_RESET: | |
42b18f60 JPM |
809 | setup = l->rst_cnt++ <= 4; |
810 | setup |= !(l->rst_cnt % 16); | |
5045f7b9 | 811 | mtyp = RESET_MSG; |
662921cd JPM |
812 | break; |
813 | case LINK_ESTABLISHING: | |
42b18f60 | 814 | setup = true; |
5045f7b9 | 815 | mtyp = ACTIVATE_MSG; |
662921cd | 816 | break; |
662921cd | 817 | case LINK_PEER_RESET: |
598411d7 | 818 | case LINK_RESETTING: |
662921cd JPM |
819 | case LINK_FAILINGOVER: |
820 | break; | |
821 | default: | |
822 | break; | |
5045f7b9 | 823 | } |
662921cd | 824 | |
42b18f60 | 825 | if (state || probe || setup) |
8d6e79d3 | 826 | tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, 0, xmitq); |
5045f7b9 | 827 | |
333ef69e JPM |
828 | return rc; |
829 | } | |
830 | ||
b97bf3fd | 831 | /** |
3127a020 | 832 | * link_schedule_user - schedule a message sender for wakeup after congestion |
365ad353 JPM |
833 | * @l: congested link |
834 | * @hdr: header of message that is being sent | |
50100a5e | 835 | * Create pseudo msg to send back to user when congestion abates |
b97bf3fd | 836 | */ |
365ad353 | 837 | static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr) |
b97bf3fd | 838 | { |
365ad353 JPM |
839 | u32 dnode = tipc_own_addr(l->net); |
840 | u32 dport = msg_origport(hdr); | |
3127a020 JPM |
841 | struct sk_buff *skb; |
842 | ||
3127a020 JPM |
843 | /* Create and schedule wakeup pseudo message */ |
844 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
365ad353 | 845 | dnode, l->addr, dport, 0, 0); |
3127a020 | 846 | if (!skb) |
22d85c79 | 847 | return -ENOBUFS; |
365ad353 JPM |
848 | msg_set_dest_droppable(buf_msg(skb), true); |
849 | TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr); | |
850 | skb_queue_tail(&l->wakeupq, skb); | |
851 | l->stats.link_congs++; | |
26574db0 | 852 | trace_tipc_link_conges(l, TIPC_DUMP_ALL, "wakeup scheduled!"); |
3127a020 | 853 | return -ELINKCONG; |
b97bf3fd PL |
854 | } |
855 | ||
50100a5e JPM |
856 | /** |
857 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
365ad353 JPM |
858 | * @l: congested link |
859 | * Wake up a number of waiting users, as permitted by available space | |
860 | * in the send queue | |
50100a5e | 861 | */ |
e064cce1 | 862 | static void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 863 | { |
7c5b4205 JM |
864 | struct sk_buff_head *wakeupq = &l->wakeupq; |
865 | struct sk_buff_head *inputq = l->inputq; | |
58d78b32 | 866 | struct sk_buff *skb, *tmp; |
7c5b4205 JM |
867 | struct sk_buff_head tmpq; |
868 | int avail[5] = {0,}; | |
869 | int imp = 0; | |
50100a5e | 870 | |
7c5b4205 JM |
871 | __skb_queue_head_init(&tmpq); |
872 | ||
873 | for (; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) | |
874 | avail[imp] = l->backlog[imp].limit - l->backlog[imp].len; | |
875 | ||
876 | skb_queue_walk_safe(wakeupq, skb, tmp) { | |
1f66d161 | 877 | imp = TIPC_SKB_CB(skb)->chain_imp; |
7c5b4205 JM |
878 | if (avail[imp] <= 0) |
879 | continue; | |
880 | avail[imp]--; | |
881 | __skb_unlink(skb, wakeupq); | |
882 | __skb_queue_tail(&tmpq, skb); | |
b97bf3fd | 883 | } |
7c5b4205 JM |
884 | |
885 | spin_lock_bh(&inputq->lock); | |
886 | skb_queue_splice_tail(&tmpq, inputq); | |
887 | spin_unlock_bh(&inputq->lock); | |
888 | ||
b97bf3fd PL |
889 | } |
890 | ||
6e498158 | 891 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 892 | { |
a1f8dd34 | 893 | struct sk_buff_head list; |
e95584a8 | 894 | u32 imp; |
a1f8dd34 YX |
895 | |
896 | __skb_queue_head_init(&list); | |
897 | ||
7ea817f4 | 898 | l->in_session = false; |
f7a93780 TL |
899 | /* Force re-synch of peer session number before establishing */ |
900 | l->peer_session--; | |
e74a386d | 901 | l->session++; |
6e498158 | 902 | l->mtu = l->advertised_mtu; |
a1f8dd34 | 903 | |
3f32d0be | 904 | spin_lock_bh(&l->wakeupq.lock); |
a1f8dd34 YX |
905 | skb_queue_splice_init(&l->wakeupq, &list); |
906 | spin_unlock_bh(&l->wakeupq.lock); | |
907 | ||
3f32d0be | 908 | spin_lock_bh(&l->inputq->lock); |
a1f8dd34 | 909 | skb_queue_splice_init(&list, l->inputq); |
3f32d0be | 910 | spin_unlock_bh(&l->inputq->lock); |
3f32d0be | 911 | |
6e498158 JPM |
912 | __skb_queue_purge(&l->transmq); |
913 | __skb_queue_purge(&l->deferdq); | |
2af5ae37 | 914 | __skb_queue_purge(&l->backlogq); |
58ee86b8 | 915 | __skb_queue_purge(&l->failover_deferdq); |
e95584a8 TL |
916 | for (imp = 0; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) { |
917 | l->backlog[imp].len = 0; | |
918 | l->backlog[imp].target_bskb = NULL; | |
919 | } | |
6e498158 | 920 | kfree_skb(l->reasm_buf); |
2320bcda | 921 | kfree_skb(l->reasm_tnlmsg); |
6e498158 JPM |
922 | kfree_skb(l->failover_reasm_skb); |
923 | l->reasm_buf = NULL; | |
2320bcda | 924 | l->reasm_tnlmsg = NULL; |
6e498158 JPM |
925 | l->failover_reasm_skb = NULL; |
926 | l->rcv_unacked = 0; | |
927 | l->snd_nxt = 1; | |
928 | l->rcv_nxt = 1; | |
9012de50 JM |
929 | l->snd_nxt_state = 1; |
930 | l->rcv_nxt_state = 1; | |
c1ab3f1d | 931 | l->acked = 0; |
6e498158 | 932 | l->silent_intv_cnt = 0; |
88e8ac70 | 933 | l->rst_cnt = 0; |
52666986 | 934 | l->bc_peer_is_up = false; |
35c55c98 | 935 | memset(&l->mon_state, 0, sizeof(l->mon_state)); |
38206d59 | 936 | tipc_link_reset_stats(l); |
b97bf3fd PL |
937 | } |
938 | ||
af9b028e JPM |
939 | /** |
940 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
941 | * @link: link to use | |
942 | * @list: chain of buffers containing message | |
943 | * @xmitq: returned list of packets to be sent by caller | |
944 | * | |
365ad353 | 945 | * Consumes the buffer chain. |
af9b028e JPM |
946 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
947 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
948 | */ | |
949 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
950 | struct sk_buff_head *xmitq) | |
951 | { | |
952 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
06e7c70c TL |
953 | struct sk_buff_head *backlogq = &l->backlogq; |
954 | struct sk_buff_head *transmq = &l->transmq; | |
955 | struct sk_buff *skb, *_skb; | |
956 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; | |
af9b028e JPM |
957 | u16 ack = l->rcv_nxt - 1; |
958 | u16 seqno = l->snd_nxt; | |
95901122 | 959 | int pkt_cnt = skb_queue_len(list); |
06e7c70c | 960 | int imp = msg_importance(hdr); |
fc1b6d6d | 961 | unsigned int mss = tipc_link_mss(l); |
06e7c70c TL |
962 | unsigned int maxwin = l->window; |
963 | unsigned int mtu = l->mtu; | |
964 | bool new_bundle; | |
365ad353 | 965 | int rc = 0; |
af9b028e | 966 | |
4952cd3e | 967 | if (unlikely(msg_size(hdr) > mtu)) { |
2320bcda TL |
968 | pr_warn("Too large msg, purging xmit list %d %d %d %d %d!\n", |
969 | skb_queue_len(list), msg_user(hdr), | |
970 | msg_type(hdr), msg_size(hdr), mtu); | |
e654f9f5 | 971 | __skb_queue_purge(list); |
af9b028e | 972 | return -EMSGSIZE; |
4952cd3e | 973 | } |
af9b028e | 974 | |
365ad353 JPM |
975 | /* Allow oversubscription of one data msg per source at congestion */ |
976 | if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) { | |
977 | if (imp == TIPC_SYSTEM_IMPORTANCE) { | |
978 | pr_warn("%s<%s>, link overflow", link_rst_msg, l->name); | |
979 | return -ENOBUFS; | |
980 | } | |
981 | rc = link_schedule_user(l, hdr); | |
982 | } | |
983 | ||
95901122 JPM |
984 | if (pkt_cnt > 1) { |
985 | l->stats.sent_fragmented++; | |
986 | l->stats.sent_fragments += pkt_cnt; | |
987 | } | |
988 | ||
af9b028e | 989 | /* Prepare each packet for sending, and add to relevant queue: */ |
06e7c70c | 990 | while ((skb = __skb_dequeue(list))) { |
af9b028e | 991 | if (likely(skb_queue_len(transmq) < maxwin)) { |
06e7c70c TL |
992 | hdr = buf_msg(skb); |
993 | msg_set_seqno(hdr, seqno); | |
994 | msg_set_ack(hdr, ack); | |
995 | msg_set_bcast_ack(hdr, bc_ack); | |
af9b028e | 996 | _skb = skb_clone(skb, GFP_ATOMIC); |
4952cd3e | 997 | if (!_skb) { |
06e7c70c | 998 | kfree_skb(skb); |
e654f9f5 | 999 | __skb_queue_purge(list); |
af9b028e | 1000 | return -ENOBUFS; |
4952cd3e | 1001 | } |
af9b028e | 1002 | __skb_queue_tail(transmq, skb); |
05572271 HL |
1003 | /* next retransmit attempt */ |
1004 | if (link_is_bc_sndlink(l)) | |
53962bce | 1005 | TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM; |
af9b028e | 1006 | __skb_queue_tail(xmitq, _skb); |
c1ab3f1d | 1007 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e | 1008 | l->rcv_unacked = 0; |
95901122 | 1009 | l->stats.sent_pkts++; |
af9b028e JPM |
1010 | seqno++; |
1011 | continue; | |
1012 | } | |
06e7c70c | 1013 | if (tipc_msg_try_bundle(l->backlog[imp].target_bskb, &skb, |
fc1b6d6d | 1014 | mss, l->addr, &new_bundle)) { |
06e7c70c TL |
1015 | if (skb) { |
1016 | /* Keep a ref. to the skb for next try */ | |
1017 | l->backlog[imp].target_bskb = skb; | |
1018 | l->backlog[imp].len++; | |
1019 | __skb_queue_tail(backlogq, skb); | |
1020 | } else { | |
1021 | if (new_bundle) { | |
1022 | l->stats.sent_bundles++; | |
1023 | l->stats.sent_bundled++; | |
1024 | } | |
1025 | l->stats.sent_bundled++; | |
1026 | } | |
af9b028e JPM |
1027 | continue; |
1028 | } | |
e95584a8 | 1029 | l->backlog[imp].target_bskb = NULL; |
06e7c70c TL |
1030 | l->backlog[imp].len += (1 + skb_queue_len(list)); |
1031 | __skb_queue_tail(backlogq, skb); | |
af9b028e JPM |
1032 | skb_queue_splice_tail_init(list, backlogq); |
1033 | } | |
1034 | l->snd_nxt = seqno; | |
365ad353 | 1035 | return rc; |
af9b028e JPM |
1036 | } |
1037 | ||
e064cce1 Y |
1038 | static void tipc_link_advance_backlog(struct tipc_link *l, |
1039 | struct sk_buff_head *xmitq) | |
d999297c JPM |
1040 | { |
1041 | struct sk_buff *skb, *_skb; | |
1042 | struct tipc_msg *hdr; | |
1043 | u16 seqno = l->snd_nxt; | |
1044 | u16 ack = l->rcv_nxt - 1; | |
52666986 | 1045 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
e95584a8 | 1046 | u32 imp; |
d999297c JPM |
1047 | |
1048 | while (skb_queue_len(&l->transmq) < l->window) { | |
1049 | skb = skb_peek(&l->backlogq); | |
1050 | if (!skb) | |
1051 | break; | |
1052 | _skb = skb_clone(skb, GFP_ATOMIC); | |
1053 | if (!_skb) | |
1054 | break; | |
1055 | __skb_dequeue(&l->backlogq); | |
1056 | hdr = buf_msg(skb); | |
e95584a8 TL |
1057 | imp = msg_importance(hdr); |
1058 | l->backlog[imp].len--; | |
1059 | if (unlikely(skb == l->backlog[imp].target_bskb)) | |
1060 | l->backlog[imp].target_bskb = NULL; | |
d999297c | 1061 | __skb_queue_tail(&l->transmq, skb); |
05572271 HL |
1062 | /* next retransmit attempt */ |
1063 | if (link_is_bc_sndlink(l)) | |
53962bce | 1064 | TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM; |
05572271 | 1065 | |
d999297c | 1066 | __skb_queue_tail(xmitq, _skb); |
c1ab3f1d | 1067 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 1068 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
1069 | msg_set_ack(hdr, ack); |
1070 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c | 1071 | l->rcv_unacked = 0; |
95901122 | 1072 | l->stats.sent_pkts++; |
d999297c JPM |
1073 | seqno++; |
1074 | } | |
1075 | l->snd_nxt = seqno; | |
1076 | } | |
1077 | ||
6a6b5c8b TL |
1078 | /** |
1079 | * link_retransmit_failure() - Detect repeated retransmit failures | |
1080 | * @l: tipc link sender | |
1081 | * @r: tipc link receiver (= l in case of unicast) | |
6a6b5c8b TL |
1082 | * @rc: returned code |
1083 | * | |
1084 | * Return: true if the repeated retransmit failures happens, otherwise | |
1085 | * false | |
1086 | */ | |
1087 | static bool link_retransmit_failure(struct tipc_link *l, struct tipc_link *r, | |
71204231 | 1088 | int *rc) |
d356eeba | 1089 | { |
6a6b5c8b TL |
1090 | struct sk_buff *skb = skb_peek(&l->transmq); |
1091 | struct tipc_msg *hdr; | |
1092 | ||
1093 | if (!skb) | |
1094 | return false; | |
6a6b5c8b | 1095 | |
71204231 TL |
1096 | if (!TIPC_SKB_CB(skb)->retr_cnt) |
1097 | return false; | |
6a6b5c8b | 1098 | |
71204231 | 1099 | if (!time_after(jiffies, TIPC_SKB_CB(skb)->retr_stamp + |
426071f1 | 1100 | msecs_to_jiffies(r->tolerance * 10))) |
71204231 TL |
1101 | return false; |
1102 | ||
1103 | hdr = buf_msg(skb); | |
1104 | if (link_is_bc_sndlink(l) && !less(r->acked, msg_seqno(hdr))) | |
1105 | return false; | |
6a6b5c8b | 1106 | |
71204231 TL |
1107 | pr_warn("Retransmission failure on link <%s>\n", l->name); |
1108 | link_print(l, "State of link "); | |
1109 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
1110 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
1111 | pr_info("sqno %u, prev: %x, dest: %x\n", | |
1112 | msg_seqno(hdr), msg_prevnode(hdr), msg_destnode(hdr)); | |
1113 | pr_info("retr_stamp %d, retr_cnt %d\n", | |
1114 | jiffies_to_msecs(TIPC_SKB_CB(skb)->retr_stamp), | |
1115 | TIPC_SKB_CB(skb)->retr_cnt); | |
1116 | ||
1117 | trace_tipc_list_dump(&l->transmq, true, "retrans failure!"); | |
1118 | trace_tipc_link_dump(l, TIPC_DUMP_NONE, "retrans failure!"); | |
1119 | trace_tipc_link_dump(r, TIPC_DUMP_NONE, "retrans failure!"); | |
1120 | ||
1121 | if (link_is_bc_sndlink(l)) { | |
1122 | r->state = LINK_RESET; | |
1123 | *rc = TIPC_LINK_DOWN_EVT; | |
1124 | } else { | |
6a6b5c8b | 1125 | *rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
6a6b5c8b | 1126 | } |
52666986 | 1127 | |
71204231 | 1128 | return true; |
d356eeba AS |
1129 | } |
1130 | ||
6a6b5c8b | 1131 | /* tipc_link_bc_retrans() - retransmit zero or more packets |
a4dc70d4 JM |
1132 | * @l: the link to transmit on |
1133 | * @r: the receiving link ordering the retransmit. Same as l if unicast | |
1134 | * @from: retransmit from (inclusive) this sequence number | |
1135 | * @to: retransmit to (inclusive) this sequence number | |
1136 | * xmitq: queue for accumulating the retransmitted packets | |
1137 | */ | |
6a6b5c8b TL |
1138 | static int tipc_link_bc_retrans(struct tipc_link *l, struct tipc_link *r, |
1139 | u16 from, u16 to, struct sk_buff_head *xmitq) | |
d999297c JPM |
1140 | { |
1141 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
52666986 | 1142 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
a4dc70d4 JM |
1143 | u16 ack = l->rcv_nxt - 1; |
1144 | struct tipc_msg *hdr; | |
6a6b5c8b | 1145 | int rc = 0; |
d999297c JPM |
1146 | |
1147 | if (!skb) | |
1148 | return 0; | |
31c4f4cc LDC |
1149 | if (less(to, from)) |
1150 | return 0; | |
d999297c | 1151 | |
26574db0 | 1152 | trace_tipc_link_retrans(r, from, to, &l->transmq); |
6a6b5c8b | 1153 | |
71204231 | 1154 | if (link_retransmit_failure(l, r, &rc)) |
6a6b5c8b | 1155 | return rc; |
c1ab3f1d | 1156 | |
d999297c | 1157 | skb_queue_walk(&l->transmq, skb) { |
d999297c | 1158 | hdr = buf_msg(skb); |
a4dc70d4 JM |
1159 | if (less(msg_seqno(hdr), from)) |
1160 | continue; | |
1161 | if (more(msg_seqno(hdr), to)) | |
1162 | break; | |
71204231 TL |
1163 | |
1164 | if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr)) | |
1165 | continue; | |
1166 | TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM; | |
fc1b6d6d | 1167 | _skb = pskb_copy(skb, GFP_ATOMIC); |
d999297c JPM |
1168 | if (!_skb) |
1169 | return 0; | |
1170 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
1171 | msg_set_ack(hdr, ack); |
1172 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
1173 | _skb->priority = TC_PRIO_CONTROL; |
1174 | __skb_queue_tail(xmitq, _skb); | |
d999297c | 1175 | l->stats.retransmitted++; |
71204231 TL |
1176 | |
1177 | /* Increase actual retrans counter & mark first time */ | |
1178 | if (!TIPC_SKB_CB(skb)->retr_cnt++) | |
1179 | TIPC_SKB_CB(skb)->retr_stamp = jiffies; | |
d999297c JPM |
1180 | } |
1181 | return 0; | |
1182 | } | |
1183 | ||
c637c103 | 1184 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1185 | * |
c637c103 | 1186 | * Consumes buffer if message is of right type |
7ae934be EH |
1187 | * Node lock must be held |
1188 | */ | |
52666986 | 1189 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 1190 | struct sk_buff_head *inputq) |
7ae934be | 1191 | { |
399574d4 | 1192 | struct sk_buff_head *mc_inputq = l->bc_rcvlink->inputq; |
a853e4c6 JPM |
1193 | struct tipc_msg *hdr = buf_msg(skb); |
1194 | ||
1195 | switch (msg_user(hdr)) { | |
c637c103 JPM |
1196 | case TIPC_LOW_IMPORTANCE: |
1197 | case TIPC_MEDIUM_IMPORTANCE: | |
1198 | case TIPC_HIGH_IMPORTANCE: | |
1199 | case TIPC_CRITICAL_IMPORTANCE: | |
2f487712 | 1200 | if (unlikely(msg_in_group(hdr) || msg_mcast(hdr))) { |
399574d4 | 1201 | skb_queue_tail(mc_inputq, skb); |
a853e4c6 JPM |
1202 | return true; |
1203 | } | |
f79e3365 | 1204 | /* fall through */ |
2f487712 | 1205 | case CONN_MANAGER: |
36c0a9df | 1206 | skb_queue_tail(inputq, skb); |
c637c103 | 1207 | return true; |
399574d4 JM |
1208 | case GROUP_PROTOCOL: |
1209 | skb_queue_tail(mc_inputq, skb); | |
1210 | return true; | |
7ae934be | 1211 | case NAME_DISTRIBUTOR: |
52666986 JPM |
1212 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
1213 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
1214 | return true; |
1215 | case MSG_BUNDLER: | |
dff29b1a | 1216 | case TUNNEL_PROTOCOL: |
c637c103 | 1217 | case MSG_FRAGMENTER: |
7ae934be | 1218 | case BCAST_PROTOCOL: |
c637c103 | 1219 | return false; |
7ae934be | 1220 | default: |
c637c103 JPM |
1221 | pr_warn("Dropping received illegal msg type\n"); |
1222 | kfree_skb(skb); | |
7384b538 | 1223 | return true; |
c637c103 | 1224 | }; |
7ae934be | 1225 | } |
c637c103 JPM |
1226 | |
1227 | /* tipc_link_input - process packet that has passed link protocol check | |
1228 | * | |
1229 | * Consumes buffer | |
7ae934be | 1230 | */ |
9073fb8b | 1231 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
58ee86b8 TL |
1232 | struct sk_buff_head *inputq, |
1233 | struct sk_buff **reasm_skb) | |
7ae934be | 1234 | { |
6e498158 | 1235 | struct tipc_msg *hdr = buf_msg(skb); |
c637c103 | 1236 | struct sk_buff *iskb; |
9945e804 | 1237 | struct sk_buff_head tmpq; |
6e498158 | 1238 | int usr = msg_user(hdr); |
6e498158 | 1239 | int pos = 0; |
c637c103 | 1240 | |
6e498158 | 1241 | if (usr == MSG_BUNDLER) { |
9945e804 | 1242 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1243 | l->stats.recv_bundles++; |
1244 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1245 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1246 | tipc_data_input(l, iskb, &tmpq); |
1247 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1248 | return 0; |
6e498158 JPM |
1249 | } else if (usr == MSG_FRAGMENTER) { |
1250 | l->stats.recv_fragments++; | |
1251 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1252 | l->stats.recv_fragmented++; | |
9073fb8b | 1253 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
1254 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
1255 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 1256 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1257 | } |
662921cd | 1258 | return 0; |
6e498158 | 1259 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 1260 | tipc_bcast_lock(l->net); |
52666986 | 1261 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 1262 | tipc_bcast_unlock(l->net); |
6e498158 | 1263 | } |
58ee86b8 | 1264 | |
6e498158 | 1265 | kfree_skb(skb); |
662921cd | 1266 | return 0; |
7ae934be EH |
1267 | } |
1268 | ||
58ee86b8 TL |
1269 | /* tipc_link_tnl_rcv() - receive TUNNEL_PROTOCOL message, drop or process the |
1270 | * inner message along with the ones in the old link's | |
1271 | * deferdq | |
1272 | * @l: tunnel link | |
1273 | * @skb: TUNNEL_PROTOCOL message | |
1274 | * @inputq: queue to put messages ready for delivery | |
1275 | */ | |
1276 | static int tipc_link_tnl_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1277 | struct sk_buff_head *inputq) | |
1278 | { | |
1279 | struct sk_buff **reasm_skb = &l->failover_reasm_skb; | |
2320bcda | 1280 | struct sk_buff **reasm_tnlmsg = &l->reasm_tnlmsg; |
58ee86b8 TL |
1281 | struct sk_buff_head *fdefq = &l->failover_deferdq; |
1282 | struct tipc_msg *hdr = buf_msg(skb); | |
1283 | struct sk_buff *iskb; | |
1284 | int ipos = 0; | |
1285 | int rc = 0; | |
1286 | u16 seqno; | |
1287 | ||
2320bcda TL |
1288 | if (msg_type(hdr) == SYNCH_MSG) { |
1289 | kfree_skb(skb); | |
1290 | return 0; | |
1291 | } | |
58ee86b8 | 1292 | |
2320bcda TL |
1293 | /* Not a fragment? */ |
1294 | if (likely(!msg_nof_fragms(hdr))) { | |
1295 | if (unlikely(!tipc_msg_extract(skb, &iskb, &ipos))) { | |
1296 | pr_warn_ratelimited("Unable to extract msg, defq: %d\n", | |
1297 | skb_queue_len(fdefq)); | |
1298 | return 0; | |
1299 | } | |
1300 | kfree_skb(skb); | |
1301 | } else { | |
1302 | /* Set fragment type for buf_append */ | |
1303 | if (msg_fragm_no(hdr) == 1) | |
1304 | msg_set_type(hdr, FIRST_FRAGMENT); | |
1305 | else if (msg_fragm_no(hdr) < msg_nof_fragms(hdr)) | |
1306 | msg_set_type(hdr, FRAGMENT); | |
1307 | else | |
1308 | msg_set_type(hdr, LAST_FRAGMENT); | |
1309 | ||
1310 | if (!tipc_buf_append(reasm_tnlmsg, &skb)) { | |
1311 | /* Successful but non-complete reassembly? */ | |
1312 | if (*reasm_tnlmsg || link_is_bc_rcvlink(l)) | |
1313 | return 0; | |
1314 | pr_warn_ratelimited("Unable to reassemble tunnel msg\n"); | |
1315 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1316 | } | |
1317 | iskb = skb; | |
58ee86b8 TL |
1318 | } |
1319 | ||
1320 | do { | |
1321 | seqno = buf_seqno(iskb); | |
58ee86b8 TL |
1322 | if (unlikely(less(seqno, l->drop_point))) { |
1323 | kfree_skb(iskb); | |
1324 | continue; | |
1325 | } | |
58ee86b8 TL |
1326 | if (unlikely(seqno != l->drop_point)) { |
1327 | __tipc_skb_queue_sorted(fdefq, seqno, iskb); | |
1328 | continue; | |
1329 | } | |
1330 | ||
1331 | l->drop_point++; | |
58ee86b8 TL |
1332 | if (!tipc_data_input(l, iskb, inputq)) |
1333 | rc |= tipc_link_input(l, iskb, inputq, reasm_skb); | |
1334 | if (unlikely(rc)) | |
1335 | break; | |
1336 | } while ((iskb = __tipc_skb_dequeue(fdefq, l->drop_point))); | |
1337 | ||
58ee86b8 TL |
1338 | return rc; |
1339 | } | |
1340 | ||
d999297c JPM |
1341 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
1342 | { | |
1343 | bool released = false; | |
1344 | struct sk_buff *skb, *tmp; | |
1345 | ||
1346 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
1347 | if (more(buf_seqno(skb), acked)) | |
1348 | break; | |
1349 | __skb_unlink(skb, &l->transmq); | |
1350 | kfree_skb(skb); | |
1351 | released = true; | |
1352 | } | |
1353 | return released; | |
1354 | } | |
1355 | ||
9195948f TL |
1356 | /* tipc_build_gap_ack_blks - build Gap ACK blocks |
1357 | * @l: tipc link that data have come with gaps in sequence if any | |
1358 | * @data: data buffer to store the Gap ACK blocks after built | |
1359 | * | |
1360 | * returns the actual allocated memory size | |
1361 | */ | |
1362 | static u16 tipc_build_gap_ack_blks(struct tipc_link *l, void *data) | |
1363 | { | |
1364 | struct sk_buff *skb = skb_peek(&l->deferdq); | |
1365 | struct tipc_gap_ack_blks *ga = data; | |
1366 | u16 len, expect, seqno = 0; | |
1367 | u8 n = 0; | |
1368 | ||
1369 | if (!skb) | |
1370 | goto exit; | |
1371 | ||
1372 | expect = buf_seqno(skb); | |
1373 | skb_queue_walk(&l->deferdq, skb) { | |
1374 | seqno = buf_seqno(skb); | |
1375 | if (unlikely(more(seqno, expect))) { | |
1376 | ga->gacks[n].ack = htons(expect - 1); | |
1377 | ga->gacks[n].gap = htons(seqno - expect); | |
1378 | if (++n >= MAX_GAP_ACK_BLKS) { | |
1379 | pr_info_ratelimited("Too few Gap ACK blocks!\n"); | |
1380 | goto exit; | |
1381 | } | |
1382 | } else if (unlikely(less(seqno, expect))) { | |
1383 | pr_warn("Unexpected skb in deferdq!\n"); | |
1384 | continue; | |
1385 | } | |
1386 | expect = seqno + 1; | |
1387 | } | |
1388 | ||
1389 | /* last block */ | |
1390 | ga->gacks[n].ack = htons(seqno); | |
1391 | ga->gacks[n].gap = 0; | |
1392 | n++; | |
1393 | ||
1394 | exit: | |
1395 | len = tipc_gap_ack_blks_sz(n); | |
1396 | ga->len = htons(len); | |
1397 | ga->gack_cnt = n; | |
1398 | return len; | |
1399 | } | |
1400 | ||
1401 | /* tipc_link_advance_transmq - advance TIPC link transmq queue by releasing | |
1402 | * acked packets, also doing retransmissions if | |
1403 | * gaps found | |
1404 | * @l: tipc link with transmq queue to be advanced | |
1405 | * @acked: seqno of last packet acked by peer without any gaps before | |
1406 | * @gap: # of gap packets | |
1407 | * @ga: buffer pointer to Gap ACK blocks from peer | |
1408 | * @xmitq: queue for accumulating the retransmitted packets if any | |
6a6b5c8b TL |
1409 | * |
1410 | * In case of a repeated retransmit failures, the call will return shortly | |
1411 | * with a returned code (e.g. TIPC_LINK_DOWN_EVT) | |
9195948f | 1412 | */ |
6a6b5c8b TL |
1413 | static int tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap, |
1414 | struct tipc_gap_ack_blks *ga, | |
1415 | struct sk_buff_head *xmitq) | |
9195948f TL |
1416 | { |
1417 | struct sk_buff *skb, *_skb, *tmp; | |
1418 | struct tipc_msg *hdr; | |
1419 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; | |
1420 | u16 ack = l->rcv_nxt - 1; | |
71204231 | 1421 | bool passed = false; |
6a6b5c8b TL |
1422 | u16 seqno, n = 0; |
1423 | int rc = 0; | |
1424 | ||
9195948f TL |
1425 | skb_queue_walk_safe(&l->transmq, skb, tmp) { |
1426 | seqno = buf_seqno(skb); | |
1427 | ||
1428 | next_gap_ack: | |
1429 | if (less_eq(seqno, acked)) { | |
1430 | /* release skb */ | |
1431 | __skb_unlink(skb, &l->transmq); | |
1432 | kfree_skb(skb); | |
1433 | } else if (less_eq(seqno, acked + gap)) { | |
71204231 TL |
1434 | /* First, check if repeated retrans failures occurs? */ |
1435 | if (!passed && link_retransmit_failure(l, l, &rc)) | |
1436 | return rc; | |
1437 | passed = true; | |
1438 | ||
1439 | /* retransmit skb if unrestricted*/ | |
382f598f TL |
1440 | if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr)) |
1441 | continue; | |
1442 | TIPC_SKB_CB(skb)->nxt_retr = TIPC_UC_RETR_TIME; | |
fc1b6d6d | 1443 | _skb = pskb_copy(skb, GFP_ATOMIC); |
9195948f TL |
1444 | if (!_skb) |
1445 | continue; | |
1446 | hdr = buf_msg(_skb); | |
1447 | msg_set_ack(hdr, ack); | |
1448 | msg_set_bcast_ack(hdr, bc_ack); | |
1449 | _skb->priority = TC_PRIO_CONTROL; | |
1450 | __skb_queue_tail(xmitq, _skb); | |
1451 | l->stats.retransmitted++; | |
71204231 TL |
1452 | |
1453 | /* Increase actual retrans counter & mark first time */ | |
1454 | if (!TIPC_SKB_CB(skb)->retr_cnt++) | |
1455 | TIPC_SKB_CB(skb)->retr_stamp = jiffies; | |
9195948f TL |
1456 | } else { |
1457 | /* retry with Gap ACK blocks if any */ | |
1458 | if (!ga || n >= ga->gack_cnt) | |
1459 | break; | |
1460 | acked = ntohs(ga->gacks[n].ack); | |
1461 | gap = ntohs(ga->gacks[n].gap); | |
1462 | n++; | |
1463 | goto next_gap_ack; | |
1464 | } | |
1465 | } | |
6a6b5c8b TL |
1466 | |
1467 | return 0; | |
9195948f TL |
1468 | } |
1469 | ||
34b9cd64 | 1470 | /* tipc_link_build_state_msg: prepare link state message for transmission |
52666986 JPM |
1471 | * |
1472 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
1473 | * risk of ack storms towards the sender | |
f9aa358a | 1474 | */ |
34b9cd64 | 1475 | int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 1476 | { |
52666986 JPM |
1477 | if (!l) |
1478 | return 0; | |
1479 | ||
1480 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
1481 | if (link_is_bc_rcvlink(l)) { | |
e74a386d | 1482 | if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) |
52666986 JPM |
1483 | return 0; |
1484 | l->rcv_unacked = 0; | |
02d11ca2 JPM |
1485 | |
1486 | /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */ | |
1487 | l->snd_nxt = l->rcv_nxt; | |
1488 | return TIPC_LINK_SND_STATE; | |
52666986 JPM |
1489 | } |
1490 | ||
1491 | /* Unicast ACK */ | |
f9aa358a JPM |
1492 | l->rcv_unacked = 0; |
1493 | l->stats.sent_acks++; | |
8d6e79d3 | 1494 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
52666986 | 1495 | return 0; |
f9aa358a JPM |
1496 | } |
1497 | ||
282b3a05 JPM |
1498 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1499 | */ | |
1500 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1501 | { | |
1502 | int mtyp = RESET_MSG; | |
634696b1 | 1503 | struct sk_buff *skb; |
282b3a05 JPM |
1504 | |
1505 | if (l->state == LINK_ESTABLISHING) | |
1506 | mtyp = ACTIVATE_MSG; | |
1507 | ||
8d6e79d3 | 1508 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, 0, xmitq); |
634696b1 JPM |
1509 | |
1510 | /* Inform peer that this endpoint is going down if applicable */ | |
1511 | skb = skb_peek_tail(xmitq); | |
1512 | if (skb && (l->state == LINK_RESET)) | |
1513 | msg_set_peer_stopping(buf_msg(skb), 1); | |
282b3a05 JPM |
1514 | } |
1515 | ||
f9aa358a | 1516 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
e0a05ebe JPM |
1517 | * Note that sending of broadcast NACK is coordinated among nodes, to |
1518 | * reduce the risk of NACK storms towards the sender | |
f9aa358a | 1519 | */ |
e0a05ebe JPM |
1520 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
1521 | struct sk_buff_head *xmitq) | |
f9aa358a JPM |
1522 | { |
1523 | u32 def_cnt = ++l->stats.deferred_recv; | |
02288248 JM |
1524 | struct sk_buff_head *dfq = &l->deferdq; |
1525 | u32 defq_len = skb_queue_len(dfq); | |
e0a05ebe | 1526 | int match1, match2; |
f9aa358a | 1527 | |
e0a05ebe JPM |
1528 | if (link_is_bc_rcvlink(l)) { |
1529 | match1 = def_cnt & 0xf; | |
1530 | match2 = tipc_own_addr(l->net) & 0xf; | |
1531 | if (match1 == match2) | |
1532 | return TIPC_LINK_SND_STATE; | |
1533 | return 0; | |
1534 | } | |
52666986 | 1535 | |
02288248 JM |
1536 | if (defq_len >= 3 && !((defq_len - 3) % 16)) { |
1537 | u16 rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; | |
1538 | ||
1539 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, | |
1540 | rcvgap, 0, 0, xmitq); | |
1541 | } | |
e0a05ebe | 1542 | return 0; |
f9aa358a JPM |
1543 | } |
1544 | ||
d999297c | 1545 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1546 | * @l: the link that should handle the message |
d999297c JPM |
1547 | * @skb: TIPC packet |
1548 | * @xmitq: queue to place packets to be sent after this call | |
1549 | */ | |
1550 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1551 | struct sk_buff_head *xmitq) | |
1552 | { | |
f9aa358a | 1553 | struct sk_buff_head *defq = &l->deferdq; |
382f598f | 1554 | struct tipc_msg *hdr = buf_msg(skb); |
81204c49 | 1555 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1556 | int rc = 0; |
1557 | ||
382f598f TL |
1558 | /* Verify and update link state */ |
1559 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) | |
1560 | return tipc_link_proto_rcv(l, skb, xmitq); | |
1561 | ||
1562 | /* Don't send probe at next timeout expiration */ | |
1563 | l->silent_intv_cnt = 0; | |
1564 | ||
f9aa358a | 1565 | do { |
d999297c | 1566 | hdr = buf_msg(skb); |
f9aa358a JPM |
1567 | seqno = msg_seqno(hdr); |
1568 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1569 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c | 1570 | |
662921cd | 1571 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1572 | if (l->state == LINK_ESTABLISHING) |
1573 | rc = TIPC_LINK_UP_EVT; | |
1574 | goto drop; | |
d999297c JPM |
1575 | } |
1576 | ||
81204c49 JPM |
1577 | /* Drop if outside receive window */ |
1578 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1579 | l->stats.duplicates++; | |
1580 | goto drop; | |
1581 | } | |
1582 | ||
d999297c JPM |
1583 | /* Forward queues and wake up waiting users */ |
1584 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1585 | tipc_link_advance_backlog(l, xmitq); | |
1586 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1587 | link_prepare_wakeup(l); | |
1588 | } | |
1589 | ||
81204c49 JPM |
1590 | /* Defer delivery if sequence gap */ |
1591 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1592 | __tipc_skb_queue_sorted(defq, seqno, skb); |
e0a05ebe | 1593 | rc |= tipc_link_build_nack_msg(l, xmitq); |
f9aa358a | 1594 | break; |
d999297c JPM |
1595 | } |
1596 | ||
81204c49 | 1597 | /* Deliver packet */ |
d999297c | 1598 | l->rcv_nxt++; |
95901122 | 1599 | l->stats.recv_pkts++; |
58ee86b8 TL |
1600 | |
1601 | if (unlikely(msg_user(hdr) == TUNNEL_PROTOCOL)) | |
1602 | rc |= tipc_link_tnl_rcv(l, skb, l->inputq); | |
1603 | else if (!tipc_data_input(l, skb, l->inputq)) | |
1604 | rc |= tipc_link_input(l, skb, l->inputq, &l->reasm_buf); | |
f9aa358a | 1605 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
34b9cd64 | 1606 | rc |= tipc_link_build_state_msg(l, xmitq); |
02d11ca2 | 1607 | if (unlikely(rc & ~TIPC_LINK_SND_STATE)) |
52666986 | 1608 | break; |
382f598f | 1609 | } while ((skb = __tipc_skb_dequeue(defq, l->rcv_nxt))); |
f9aa358a JPM |
1610 | |
1611 | return rc; | |
1612 | drop: | |
1613 | kfree_skb(skb); | |
d999297c JPM |
1614 | return rc; |
1615 | } | |
1616 | ||
426cc2b8 | 1617 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
1618 | bool probe_reply, u16 rcvgap, |
1619 | int tolerance, int priority, | |
426cc2b8 JPM |
1620 | struct sk_buff_head *xmitq) |
1621 | { | |
02d11ca2 | 1622 | struct tipc_link *bcl = l->bc_rcvlink; |
e74a386d JPM |
1623 | struct sk_buff *skb; |
1624 | struct tipc_msg *hdr; | |
1625 | struct sk_buff_head *dfq = &l->deferdq; | |
02d11ca2 | 1626 | bool node_up = link_is_up(bcl); |
35c55c98 JPM |
1627 | struct tipc_mon_state *mstate = &l->mon_state; |
1628 | int dlen = 0; | |
1629 | void *data; | |
9195948f | 1630 | u16 glen = 0; |
426cc2b8 JPM |
1631 | |
1632 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1633 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1634 | return; |
1635 | ||
e74a386d JPM |
1636 | if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) |
1637 | return; | |
1638 | ||
02288248 | 1639 | if ((probe || probe_reply) && !skb_queue_empty(dfq)) |
e74a386d JPM |
1640 | rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; |
1641 | ||
1642 | skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, | |
9195948f TL |
1643 | tipc_max_domain_size + MAX_GAP_ACK_BLKS_SZ, |
1644 | l->addr, tipc_own_addr(l->net), 0, 0, 0); | |
e74a386d JPM |
1645 | if (!skb) |
1646 | return; | |
1647 | ||
1648 | hdr = buf_msg(skb); | |
35c55c98 | 1649 | data = msg_data(hdr); |
e74a386d JPM |
1650 | msg_set_session(hdr, l->session); |
1651 | msg_set_bearer_id(hdr, l->bearer_id); | |
426cc2b8 | 1652 | msg_set_net_plane(hdr, l->net_plane); |
52666986 JPM |
1653 | msg_set_next_sent(hdr, l->snd_nxt); |
1654 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
02d11ca2 | 1655 | msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); |
06bd2b1e | 1656 | msg_set_bc_ack_invalid(hdr, !node_up); |
52666986 | 1657 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); |
426cc2b8 JPM |
1658 | msg_set_link_tolerance(hdr, tolerance); |
1659 | msg_set_linkprio(hdr, priority); | |
1660 | msg_set_redundant_link(hdr, node_up); | |
1661 | msg_set_seq_gap(hdr, 0); | |
52666986 | 1662 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1663 | |
1664 | if (mtyp == STATE_MSG) { | |
9012de50 JM |
1665 | if (l->peer_caps & TIPC_LINK_PROTO_SEQNO) |
1666 | msg_set_seqno(hdr, l->snd_nxt_state++); | |
e74a386d | 1667 | msg_set_seq_gap(hdr, rcvgap); |
02d11ca2 | 1668 | msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl)); |
426cc2b8 | 1669 | msg_set_probe(hdr, probe); |
8d6e79d3 | 1670 | msg_set_is_keepalive(hdr, probe || probe_reply); |
9195948f TL |
1671 | if (l->peer_caps & TIPC_GAP_ACK_BLOCK) |
1672 | glen = tipc_build_gap_ack_blks(l, data); | |
1673 | tipc_mon_prep(l->net, data + glen, &dlen, mstate, l->bearer_id); | |
1674 | msg_set_size(hdr, INT_H_SIZE + glen + dlen); | |
1675 | skb_trim(skb, INT_H_SIZE + glen + dlen); | |
426cc2b8 | 1676 | l->stats.sent_states++; |
52666986 | 1677 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1678 | } else { |
1679 | /* RESET_MSG or ACTIVATE_MSG */ | |
91986ee1 TL |
1680 | if (mtyp == ACTIVATE_MSG) { |
1681 | msg_set_dest_session_valid(hdr, 1); | |
1682 | msg_set_dest_session(hdr, l->peer_session); | |
1683 | } | |
426cc2b8 | 1684 | msg_set_max_pkt(hdr, l->advertised_mtu); |
35c55c98 JPM |
1685 | strcpy(data, l->if_name); |
1686 | msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
1687 | skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
426cc2b8 | 1688 | } |
e74a386d JPM |
1689 | if (probe) |
1690 | l->stats.sent_probes++; | |
1691 | if (rcvgap) | |
1692 | l->stats.sent_nacks++; | |
426cc2b8 | 1693 | skb->priority = TC_PRIO_CONTROL; |
6e498158 | 1694 | __skb_queue_tail(xmitq, skb); |
26574db0 | 1695 | trace_tipc_proto_build(skb, false, l->name); |
b97bf3fd PL |
1696 | } |
1697 | ||
c140eb16 LDC |
1698 | void tipc_link_create_dummy_tnl_msg(struct tipc_link *l, |
1699 | struct sk_buff_head *xmitq) | |
1700 | { | |
1701 | u32 onode = tipc_own_addr(l->net); | |
1702 | struct tipc_msg *hdr, *ihdr; | |
1703 | struct sk_buff_head tnlq; | |
1704 | struct sk_buff *skb; | |
1705 | u32 dnode = l->addr; | |
1706 | ||
e654f9f5 | 1707 | __skb_queue_head_init(&tnlq); |
c140eb16 LDC |
1708 | skb = tipc_msg_create(TUNNEL_PROTOCOL, FAILOVER_MSG, |
1709 | INT_H_SIZE, BASIC_H_SIZE, | |
1710 | dnode, onode, 0, 0, 0); | |
1711 | if (!skb) { | |
1712 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
1713 | return; | |
1714 | } | |
1715 | ||
1716 | hdr = buf_msg(skb); | |
1717 | msg_set_msgcnt(hdr, 1); | |
1718 | msg_set_bearer_id(hdr, l->peer_bearer_id); | |
1719 | ||
1720 | ihdr = (struct tipc_msg *)msg_data(hdr); | |
1721 | tipc_msg_init(onode, ihdr, TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
1722 | BASIC_H_SIZE, dnode); | |
1723 | msg_set_errcode(ihdr, TIPC_ERR_NO_PORT); | |
1724 | __skb_queue_tail(&tnlq, skb); | |
1725 | tipc_link_xmit(l, &tnlq, xmitq); | |
1726 | } | |
1727 | ||
6e498158 | 1728 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1729 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1730 | */ |
6e498158 JPM |
1731 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1732 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1733 | { |
58ee86b8 | 1734 | struct sk_buff_head *fdefq = &tnl->failover_deferdq; |
6e498158 JPM |
1735 | struct sk_buff *skb, *tnlskb; |
1736 | struct tipc_msg *hdr, tnlhdr; | |
1737 | struct sk_buff_head *queue = &l->transmq; | |
2320bcda | 1738 | struct sk_buff_head tmpxq, tnlq, frags; |
6e498158 | 1739 | u16 pktlen, pktcnt, seqno = l->snd_nxt; |
2320bcda | 1740 | bool pktcnt_need_update = false; |
4929a932 | 1741 | u16 syncpt; |
2320bcda | 1742 | int rc; |
b97bf3fd | 1743 | |
6e498158 | 1744 | if (!tnl) |
b97bf3fd PL |
1745 | return; |
1746 | ||
e654f9f5 | 1747 | __skb_queue_head_init(&tnlq); |
4929a932 TL |
1748 | /* Link Synching: |
1749 | * From now on, send only one single ("dummy") SYNCH message | |
1750 | * to peer. The SYNCH message does not contain any data, just | |
1751 | * a header conveying the synch point to the peer. | |
1752 | */ | |
1753 | if (mtyp == SYNCH_MSG && (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) { | |
1754 | tnlskb = tipc_msg_create(TUNNEL_PROTOCOL, SYNCH_MSG, | |
1755 | INT_H_SIZE, 0, l->addr, | |
1756 | tipc_own_addr(l->net), | |
1757 | 0, 0, 0); | |
1758 | if (!tnlskb) { | |
1759 | pr_warn("%sunable to create dummy SYNCH_MSG\n", | |
1760 | link_co_err); | |
1761 | return; | |
1762 | } | |
1763 | ||
1764 | hdr = buf_msg(tnlskb); | |
1765 | syncpt = l->snd_nxt + skb_queue_len(&l->backlogq) - 1; | |
1766 | msg_set_syncpt(hdr, syncpt); | |
1767 | msg_set_bearer_id(hdr, l->peer_bearer_id); | |
1768 | __skb_queue_tail(&tnlq, tnlskb); | |
1769 | tipc_link_xmit(tnl, &tnlq, xmitq); | |
1770 | return; | |
1771 | } | |
1772 | ||
d0d605c5 TL |
1773 | __skb_queue_head_init(&tmpxq); |
1774 | __skb_queue_head_init(&frags); | |
1775 | /* At least one packet required for safe algorithm => add dummy */ | |
1776 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
1777 | BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net), | |
1778 | 0, 0, TIPC_ERR_NO_PORT); | |
1779 | if (!skb) { | |
1780 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
1781 | return; | |
1782 | } | |
1783 | __skb_queue_tail(&tnlq, skb); | |
1784 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1785 | __skb_queue_purge(&tmpxq); | |
1786 | ||
6e498158 | 1787 | /* Initialize reusable tunnel packet header */ |
e74a386d | 1788 | tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, |
6e498158 | 1789 | mtyp, INT_H_SIZE, l->addr); |
58ee86b8 TL |
1790 | if (mtyp == SYNCH_MSG) |
1791 | pktcnt = l->snd_nxt - buf_seqno(skb_peek(&l->transmq)); | |
1792 | else | |
1793 | pktcnt = skb_queue_len(&l->transmq); | |
1794 | pktcnt += skb_queue_len(&l->backlogq); | |
6e498158 JPM |
1795 | msg_set_msgcnt(&tnlhdr, pktcnt); |
1796 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1797 | tnl: | |
1798 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1799 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1800 | hdr = buf_msg(skb); |
1801 | if (queue == &l->backlogq) | |
1802 | msg_set_seqno(hdr, seqno++); | |
1803 | pktlen = msg_size(hdr); | |
2320bcda TL |
1804 | |
1805 | /* Tunnel link MTU is not large enough? This could be | |
1806 | * due to: | |
1807 | * 1) Link MTU has just changed or set differently; | |
1808 | * 2) Or FAILOVER on the top of a SYNCH message | |
1809 | * | |
1810 | * The 2nd case should not happen if peer supports | |
1811 | * TIPC_TUNNEL_ENHANCED | |
1812 | */ | |
1813 | if (pktlen > tnl->mtu - INT_H_SIZE) { | |
1814 | if (mtyp == FAILOVER_MSG && | |
1815 | (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) { | |
1816 | rc = tipc_msg_fragment(skb, &tnlhdr, tnl->mtu, | |
1817 | &frags); | |
1818 | if (rc) { | |
1819 | pr_warn("%sunable to frag msg: rc %d\n", | |
1820 | link_co_err, rc); | |
1821 | return; | |
1822 | } | |
1823 | pktcnt += skb_queue_len(&frags) - 1; | |
1824 | pktcnt_need_update = true; | |
1825 | skb_queue_splice_tail_init(&frags, &tnlq); | |
1826 | continue; | |
1827 | } | |
1828 | /* Unluckily, peer doesn't have TIPC_TUNNEL_ENHANCED | |
1829 | * => Just warn it and return! | |
1830 | */ | |
1831 | pr_warn_ratelimited("%stoo large msg <%d, %d>: %d!\n", | |
1832 | link_co_err, msg_user(hdr), | |
1833 | msg_type(hdr), msg_size(hdr)); | |
1834 | return; | |
1835 | } | |
1836 | ||
6e498158 | 1837 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); |
57d5f64d | 1838 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE, GFP_ATOMIC); |
6e498158 JPM |
1839 | if (!tnlskb) { |
1840 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1841 | return; |
1842 | } | |
6e498158 JPM |
1843 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1844 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1845 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1846 | } |
6e498158 JPM |
1847 | if (queue != &l->backlogq) { |
1848 | queue = &l->backlogq; | |
1849 | goto tnl; | |
f006c9c7 | 1850 | } |
1dab3d5a | 1851 | |
2320bcda TL |
1852 | if (pktcnt_need_update) |
1853 | skb_queue_walk(&tnlq, skb) { | |
1854 | hdr = buf_msg(skb); | |
1855 | msg_set_msgcnt(hdr, pktcnt); | |
1856 | } | |
1857 | ||
6e498158 | 1858 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1859 | |
6e498158 JPM |
1860 | if (mtyp == FAILOVER_MSG) { |
1861 | tnl->drop_point = l->rcv_nxt; | |
1862 | tnl->failover_reasm_skb = l->reasm_buf; | |
1863 | l->reasm_buf = NULL; | |
58ee86b8 TL |
1864 | |
1865 | /* Failover the link's deferdq */ | |
1866 | if (unlikely(!skb_queue_empty(fdefq))) { | |
1867 | pr_warn("Link failover deferdq not empty: %d!\n", | |
1868 | skb_queue_len(fdefq)); | |
1869 | __skb_queue_purge(fdefq); | |
1870 | } | |
1871 | skb_queue_splice_init(&l->deferdq, fdefq); | |
2da71425 | 1872 | } |
b97bf3fd PL |
1873 | } |
1874 | ||
c0b14a08 TL |
1875 | /** |
1876 | * tipc_link_failover_prepare() - prepare tnl for link failover | |
1877 | * | |
1878 | * This is a special version of the precursor - tipc_link_tnl_prepare(), | |
1879 | * see the tipc_node_link_failover() for details | |
1880 | * | |
1881 | * @l: failover link | |
1882 | * @tnl: tunnel link | |
1883 | * @xmitq: queue for messages to be xmited | |
1884 | */ | |
1885 | void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl, | |
1886 | struct sk_buff_head *xmitq) | |
1887 | { | |
1888 | struct sk_buff_head *fdefq = &tnl->failover_deferdq; | |
1889 | ||
1890 | tipc_link_create_dummy_tnl_msg(tnl, xmitq); | |
1891 | ||
8ebed8ae | 1892 | /* This failover link endpoint was never established before, |
c0b14a08 TL |
1893 | * so it has not received anything from peer. |
1894 | * Otherwise, it must be a normal failover situation or the | |
1895 | * node has entered SELF_DOWN_PEER_LEAVING and both peer nodes | |
1896 | * would have to start over from scratch instead. | |
1897 | */ | |
c0b14a08 TL |
1898 | tnl->drop_point = 1; |
1899 | tnl->failover_reasm_skb = NULL; | |
1900 | ||
1901 | /* Initiate the link's failover deferdq */ | |
1902 | if (unlikely(!skb_queue_empty(fdefq))) { | |
1903 | pr_warn("Link failover deferdq not empty: %d!\n", | |
1904 | skb_queue_len(fdefq)); | |
1905 | __skb_queue_purge(fdefq); | |
1906 | } | |
1907 | } | |
1908 | ||
7ea817f4 JM |
1909 | /* tipc_link_validate_msg(): validate message against current link state |
1910 | * Returns true if message should be accepted, otherwise false | |
1911 | */ | |
1912 | bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr) | |
1913 | { | |
1914 | u16 curr_session = l->peer_session; | |
1915 | u16 session = msg_session(hdr); | |
1916 | int mtyp = msg_type(hdr); | |
1917 | ||
1918 | if (msg_user(hdr) != LINK_PROTOCOL) | |
1919 | return true; | |
1920 | ||
1921 | switch (mtyp) { | |
1922 | case RESET_MSG: | |
1923 | if (!l->in_session) | |
1924 | return true; | |
1925 | /* Accept only RESET with new session number */ | |
1926 | return more(session, curr_session); | |
1927 | case ACTIVATE_MSG: | |
1928 | if (!l->in_session) | |
1929 | return true; | |
1930 | /* Accept only ACTIVATE with new or current session number */ | |
1931 | return !less(session, curr_session); | |
1932 | case STATE_MSG: | |
1933 | /* Accept only STATE with current session number */ | |
1934 | if (!l->in_session) | |
1935 | return false; | |
1936 | if (session != curr_session) | |
1937 | return false; | |
d949cfed LDC |
1938 | /* Extra sanity check */ |
1939 | if (!link_is_up(l) && msg_ack(hdr)) | |
1940 | return false; | |
7ea817f4 JM |
1941 | if (!(l->peer_caps & TIPC_LINK_PROTO_SEQNO)) |
1942 | return true; | |
1943 | /* Accept only STATE with new sequence number */ | |
1944 | return !less(msg_seqno(hdr), l->rcv_nxt_state); | |
1945 | default: | |
1946 | return false; | |
1947 | } | |
1948 | } | |
1949 | ||
d999297c JPM |
1950 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1951 | * Note that network plane id propagates through the network, and may | |
1952 | * change at any time. The node with lowest numerical id determines | |
1953 | * network plane | |
1954 | */ | |
1955 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1956 | struct sk_buff_head *xmitq) | |
1957 | { | |
1958 | struct tipc_msg *hdr = buf_msg(skb); | |
9195948f | 1959 | struct tipc_gap_ack_blks *ga = NULL; |
d999297c | 1960 | u16 rcvgap = 0; |
c1ab3f1d JPM |
1961 | u16 ack = msg_ack(hdr); |
1962 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1963 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1964 | u16 peers_tol = msg_link_tolerance(hdr); | |
1965 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1966 | u16 rcv_nxt = l->rcv_nxt; |
35c55c98 | 1967 | u16 dlen = msg_data_sz(hdr); |
73f646ce | 1968 | int mtyp = msg_type(hdr); |
8d6e79d3 | 1969 | bool reply = msg_probe(hdr); |
9195948f | 1970 | u16 glen = 0; |
35c55c98 | 1971 | void *data; |
d999297c JPM |
1972 | char *if_name; |
1973 | int rc = 0; | |
1974 | ||
26574db0 | 1975 | trace_tipc_proto_rcv(skb, false, l->name); |
52666986 | 1976 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
1977 | goto exit; |
1978 | ||
e74a386d | 1979 | if (tipc_own_addr(l->net) > msg_prevnode(hdr)) |
d999297c JPM |
1980 | l->net_plane = msg_net_plane(hdr); |
1981 | ||
35c55c98 JPM |
1982 | skb_linearize(skb); |
1983 | hdr = buf_msg(skb); | |
1984 | data = msg_data(hdr); | |
1985 | ||
26574db0 TL |
1986 | if (!tipc_link_validate_msg(l, hdr)) { |
1987 | trace_tipc_skb_dump(skb, false, "PROTO invalid (1)!"); | |
1988 | trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (1)!"); | |
7ea817f4 | 1989 | goto exit; |
26574db0 | 1990 | } |
7ea817f4 | 1991 | |
73f646ce | 1992 | switch (mtyp) { |
d999297c | 1993 | case RESET_MSG: |
d999297c | 1994 | case ACTIVATE_MSG: |
d999297c JPM |
1995 | /* Complete own link name with peer's interface name */ |
1996 | if_name = strrchr(l->name, ':') + 1; | |
1997 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1998 | break; | |
1999 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
2000 | break; | |
35c55c98 | 2001 | strncpy(if_name, data, TIPC_MAX_IF_NAME); |
d999297c JPM |
2002 | |
2003 | /* Update own tolerance if peer indicates a non-zero value */ | |
047491ea | 2004 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) { |
d999297c | 2005 | l->tolerance = peers_tol; |
047491ea JM |
2006 | l->bc_rcvlink->tolerance = peers_tol; |
2007 | } | |
d999297c JPM |
2008 | /* Update own priority if peer's priority is higher */ |
2009 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
2010 | l->priority = peers_prio; | |
2011 | ||
7ab412d3 JM |
2012 | /* If peer is going down we want full re-establish cycle */ |
2013 | if (msg_peer_stopping(hdr)) { | |
634696b1 | 2014 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
7ab412d3 JM |
2015 | break; |
2016 | } | |
91986ee1 TL |
2017 | |
2018 | /* If this endpoint was re-created while peer was ESTABLISHING | |
2019 | * it doesn't know current session number. Force re-synch. | |
2020 | */ | |
2021 | if (mtyp == ACTIVATE_MSG && msg_dest_session_valid(hdr) && | |
2022 | l->session != msg_dest_session(hdr)) { | |
2023 | if (less(l->session, msg_dest_session(hdr))) | |
2024 | l->session = msg_dest_session(hdr) + 1; | |
2025 | break; | |
2026 | } | |
2027 | ||
7ab412d3 JM |
2028 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
2029 | if (mtyp == RESET_MSG || !link_is_up(l)) | |
73f646ce JPM |
2030 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); |
2031 | ||
2032 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
7ab412d3 | 2033 | if (mtyp == ACTIVATE_MSG && l->state == LINK_ESTABLISHING) |
73f646ce JPM |
2034 | rc = TIPC_LINK_UP_EVT; |
2035 | ||
d999297c | 2036 | l->peer_session = msg_session(hdr); |
7ea817f4 | 2037 | l->in_session = true; |
d999297c | 2038 | l->peer_bearer_id = msg_bearer_id(hdr); |
d999297c JPM |
2039 | if (l->mtu > msg_max_pkt(hdr)) |
2040 | l->mtu = msg_max_pkt(hdr); | |
2041 | break; | |
662921cd | 2042 | |
d999297c | 2043 | case STATE_MSG: |
9012de50 JM |
2044 | l->rcv_nxt_state = msg_seqno(hdr) + 1; |
2045 | ||
d999297c | 2046 | /* Update own tolerance if peer indicates a non-zero value */ |
047491ea | 2047 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) { |
d999297c | 2048 | l->tolerance = peers_tol; |
047491ea JM |
2049 | l->bc_rcvlink->tolerance = peers_tol; |
2050 | } | |
f7967556 JPM |
2051 | /* Update own prio if peer indicates a different value */ |
2052 | if ((peers_prio != l->priority) && | |
2053 | in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) { | |
81729810 RA |
2054 | l->priority = peers_prio; |
2055 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
2056 | } | |
2057 | ||
d999297c JPM |
2058 | l->silent_intv_cnt = 0; |
2059 | l->stats.recv_states++; | |
2060 | if (msg_probe(hdr)) | |
2061 | l->stats.recv_probes++; | |
73f646ce JPM |
2062 | |
2063 | if (!link_is_up(l)) { | |
2064 | if (l->state == LINK_ESTABLISHING) | |
2065 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 2066 | break; |
73f646ce | 2067 | } |
9195948f TL |
2068 | |
2069 | /* Receive Gap ACK blocks from peer if any */ | |
2070 | if (l->peer_caps & TIPC_GAP_ACK_BLOCK) { | |
2071 | ga = (struct tipc_gap_ack_blks *)data; | |
2072 | glen = ntohs(ga->len); | |
2073 | /* sanity check: if failed, ignore Gap ACK blocks */ | |
2074 | if (glen != tipc_gap_ack_blks_sz(ga->gack_cnt)) | |
2075 | ga = NULL; | |
2076 | } | |
2077 | ||
2078 | tipc_mon_rcv(l->net, data + glen, dlen - glen, l->addr, | |
35c55c98 | 2079 | &l->mon_state, l->bearer_id); |
d999297c | 2080 | |
662921cd | 2081 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 2082 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c | 2083 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
8d6e79d3 JM |
2084 | if (rcvgap || reply) |
2085 | tipc_link_build_proto_msg(l, STATE_MSG, 0, reply, | |
2086 | rcvgap, 0, 0, xmitq); | |
6a6b5c8b | 2087 | rc |= tipc_link_advance_transmq(l, ack, gap, ga, xmitq); |
d999297c JPM |
2088 | |
2089 | /* If NACK, retransmit will now start at right position */ | |
9195948f | 2090 | if (gap) |
d999297c | 2091 | l->stats.recv_nacks++; |
662921cd | 2092 | |
d999297c JPM |
2093 | tipc_link_advance_backlog(l, xmitq); |
2094 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
2095 | link_prepare_wakeup(l); | |
2096 | } | |
2097 | exit: | |
2098 | kfree_skb(skb); | |
2099 | return rc; | |
2100 | } | |
2101 | ||
52666986 JPM |
2102 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
2103 | */ | |
2104 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
2105 | u16 peers_snd_nxt, | |
2106 | struct sk_buff_head *xmitq) | |
2107 | { | |
2108 | struct sk_buff *skb; | |
2109 | struct tipc_msg *hdr; | |
2110 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
2111 | u16 ack = l->rcv_nxt - 1; | |
2112 | u16 gap_to = peers_snd_nxt - 1; | |
2113 | ||
2114 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
e74a386d | 2115 | 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); |
52666986 JPM |
2116 | if (!skb) |
2117 | return false; | |
2118 | hdr = buf_msg(skb); | |
2119 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
2120 | msg_set_bcast_ack(hdr, ack); | |
2121 | msg_set_bcgap_after(hdr, ack); | |
2122 | if (dfrd_skb) | |
2123 | gap_to = buf_seqno(dfrd_skb) - 1; | |
2124 | msg_set_bcgap_to(hdr, gap_to); | |
2125 | msg_set_non_seq(hdr, bcast); | |
2126 | __skb_queue_tail(xmitq, skb); | |
2127 | return true; | |
2128 | } | |
2129 | ||
2130 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
2131 | * | |
2132 | * Give a newly added peer node the sequence number where it should | |
2133 | * start receiving and acking broadcast packets. | |
2134 | */ | |
742e0383 WF |
2135 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
2136 | struct sk_buff_head *xmitq) | |
52666986 JPM |
2137 | { |
2138 | struct sk_buff_head list; | |
2139 | ||
2140 | __skb_queue_head_init(&list); | |
2141 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
2142 | return; | |
06bd2b1e | 2143 | msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true); |
52666986 JPM |
2144 | tipc_link_xmit(l, &list, xmitq); |
2145 | } | |
2146 | ||
2147 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
2148 | */ | |
2149 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
2150 | { | |
2151 | int mtyp = msg_type(hdr); | |
2152 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
2153 | ||
2154 | if (link_is_up(l)) | |
2155 | return; | |
2156 | ||
2157 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
2158 | l->rcv_nxt = peers_snd_nxt; | |
2159 | l->state = LINK_ESTABLISHED; | |
2160 | return; | |
2161 | } | |
2162 | ||
2163 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
2164 | return; | |
2165 | ||
2166 | if (msg_peer_node_is_up(hdr)) | |
2167 | return; | |
2168 | ||
2169 | /* Compatibility: accept older, less safe initial synch data */ | |
2170 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
2171 | l->rcv_nxt = peers_snd_nxt; | |
2172 | } | |
2173 | ||
2174 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state | |
2175 | */ | |
02d11ca2 JPM |
2176 | int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, |
2177 | struct sk_buff_head *xmitq) | |
52666986 | 2178 | { |
7c4a54b9 | 2179 | struct tipc_link *snd_l = l->bc_sndlink; |
52666986 | 2180 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); |
02d11ca2 JPM |
2181 | u16 from = msg_bcast_ack(hdr) + 1; |
2182 | u16 to = from + msg_bc_gap(hdr) - 1; | |
2183 | int rc = 0; | |
52666986 JPM |
2184 | |
2185 | if (!link_is_up(l)) | |
02d11ca2 | 2186 | return rc; |
52666986 JPM |
2187 | |
2188 | if (!msg_peer_node_is_up(hdr)) | |
02d11ca2 | 2189 | return rc; |
52666986 | 2190 | |
2d18ac4b JPM |
2191 | /* Open when peer ackowledges our bcast init msg (pkt #1) */ |
2192 | if (msg_ack(hdr)) | |
2193 | l->bc_peer_is_up = true; | |
2194 | ||
2195 | if (!l->bc_peer_is_up) | |
02d11ca2 | 2196 | return rc; |
52666986 | 2197 | |
7c4a54b9 JPM |
2198 | l->stats.recv_nacks++; |
2199 | ||
52666986 JPM |
2200 | /* Ignore if peers_snd_nxt goes beyond receive window */ |
2201 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
02d11ca2 JPM |
2202 | return rc; |
2203 | ||
6a6b5c8b | 2204 | rc = tipc_link_bc_retrans(snd_l, l, from, to, xmitq); |
02d11ca2 JPM |
2205 | |
2206 | l->snd_nxt = peers_snd_nxt; | |
2207 | if (link_bc_rcv_gap(l)) | |
2208 | rc |= TIPC_LINK_SND_STATE; | |
2209 | ||
2210 | /* Return now if sender supports nack via STATE messages */ | |
2211 | if (l->peer_caps & TIPC_BCAST_STATE_NACK) | |
2212 | return rc; | |
2213 | ||
2214 | /* Otherwise, be backwards compatible */ | |
52666986 JPM |
2215 | |
2216 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
2217 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
02d11ca2 | 2218 | return 0; |
52666986 JPM |
2219 | } |
2220 | ||
2221 | /* Don't NACK if one was recently sent or peeked */ | |
2222 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
2223 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
02d11ca2 | 2224 | return 0; |
52666986 JPM |
2225 | } |
2226 | ||
2227 | /* Conditionally delay NACK sending until next synch rcv */ | |
2228 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
2229 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
2230 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
02d11ca2 | 2231 | return 0; |
52666986 JPM |
2232 | } |
2233 | ||
2234 | /* Send NACK now but suppress next one */ | |
2235 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
2236 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
02d11ca2 | 2237 | return 0; |
52666986 JPM |
2238 | } |
2239 | ||
2240 | void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, | |
2241 | struct sk_buff_head *xmitq) | |
2242 | { | |
2243 | struct sk_buff *skb, *tmp; | |
2244 | struct tipc_link *snd_l = l->bc_sndlink; | |
2245 | ||
2246 | if (!link_is_up(l) || !l->bc_peer_is_up) | |
2247 | return; | |
2248 | ||
2249 | if (!more(acked, l->acked)) | |
2250 | return; | |
2251 | ||
26574db0 | 2252 | trace_tipc_link_bc_ack(l, l->acked, acked, &snd_l->transmq); |
52666986 JPM |
2253 | /* Skip over packets peer has already acked */ |
2254 | skb_queue_walk(&snd_l->transmq, skb) { | |
2255 | if (more(buf_seqno(skb), l->acked)) | |
2256 | break; | |
2257 | } | |
2258 | ||
2259 | /* Update/release the packets peer is acking now */ | |
2260 | skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { | |
2261 | if (more(buf_seqno(skb), acked)) | |
2262 | break; | |
2263 | if (!--TIPC_SKB_CB(skb)->ackers) { | |
2264 | __skb_unlink(skb, &snd_l->transmq); | |
2265 | kfree_skb(skb); | |
2266 | } | |
2267 | } | |
2268 | l->acked = acked; | |
2269 | tipc_link_advance_backlog(snd_l, xmitq); | |
2270 | if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) | |
2271 | link_prepare_wakeup(snd_l); | |
2272 | } | |
2273 | ||
2274 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
02d11ca2 JPM |
2275 | * This function is here for backwards compatibility, since |
2276 | * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5. | |
52666986 JPM |
2277 | */ |
2278 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
2279 | struct sk_buff_head *xmitq) | |
2280 | { | |
2281 | struct tipc_msg *hdr = buf_msg(skb); | |
2282 | u32 dnode = msg_destnode(hdr); | |
2283 | int mtyp = msg_type(hdr); | |
2284 | u16 acked = msg_bcast_ack(hdr); | |
2285 | u16 from = acked + 1; | |
2286 | u16 to = msg_bcgap_to(hdr); | |
2287 | u16 peers_snd_nxt = to + 1; | |
2288 | int rc = 0; | |
2289 | ||
2290 | kfree_skb(skb); | |
2291 | ||
2292 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
2293 | return 0; | |
2294 | ||
2295 | if (mtyp != STATE_MSG) | |
2296 | return 0; | |
2297 | ||
e74a386d | 2298 | if (dnode == tipc_own_addr(l->net)) { |
52666986 | 2299 | tipc_link_bc_ack_rcv(l, acked, xmitq); |
6a6b5c8b | 2300 | rc = tipc_link_bc_retrans(l->bc_sndlink, l, from, to, xmitq); |
52666986 JPM |
2301 | l->stats.recv_nacks++; |
2302 | return rc; | |
2303 | } | |
2304 | ||
2305 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
2306 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
2307 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
2308 | ||
2309 | return 0; | |
2310 | } | |
2311 | ||
e3eea1eb | 2312 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 2313 | { |
218527fe | 2314 | int max_bulk = TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
2315 | |
2316 | l->window = win; | |
5a0950c2 JPM |
2317 | l->backlog[TIPC_LOW_IMPORTANCE].limit = max_t(u16, 50, win); |
2318 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = max_t(u16, 100, win * 2); | |
2319 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = max_t(u16, 150, win * 3); | |
2320 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = max_t(u16, 200, win * 4); | |
1f66d161 | 2321 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; |
b97bf3fd PL |
2322 | } |
2323 | ||
b97bf3fd | 2324 | /** |
38206d59 | 2325 | * link_reset_stats - reset link statistics |
1a90632d | 2326 | * @l: pointer to link |
b97bf3fd | 2327 | */ |
38206d59 | 2328 | void tipc_link_reset_stats(struct tipc_link *l) |
b97bf3fd | 2329 | { |
38206d59 | 2330 | memset(&l->stats, 0, sizeof(l->stats)); |
b97bf3fd PL |
2331 | } |
2332 | ||
1a20cc25 | 2333 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 2334 | { |
1a20cc25 | 2335 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 2336 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 2337 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 2338 | |
662921cd | 2339 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
2340 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
2341 | skb_queue_len(&l->transmq), head, tail, | |
2342 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 2343 | } |
0655f6a8 RA |
2344 | |
2345 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
2346 | */ | |
2347 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
2348 | { | |
2349 | int err; | |
2350 | ||
8cb08174 JB |
2351 | err = nla_parse_nested_deprecated(props, TIPC_NLA_PROP_MAX, prop, |
2352 | tipc_nl_prop_policy, NULL); | |
0655f6a8 RA |
2353 | if (err) |
2354 | return err; | |
2355 | ||
2356 | if (props[TIPC_NLA_PROP_PRIO]) { | |
2357 | u32 prio; | |
2358 | ||
2359 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
2360 | if (prio > TIPC_MAX_LINK_PRI) | |
2361 | return -EINVAL; | |
2362 | } | |
2363 | ||
2364 | if (props[TIPC_NLA_PROP_TOL]) { | |
2365 | u32 tol; | |
2366 | ||
2367 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
2368 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
2369 | return -EINVAL; | |
2370 | } | |
2371 | ||
2372 | if (props[TIPC_NLA_PROP_WIN]) { | |
2373 | u32 win; | |
2374 | ||
2375 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
2376 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
2377 | return -EINVAL; | |
2378 | } | |
2379 | ||
2380 | return 0; | |
2381 | } | |
7be57fc6 | 2382 | |
d8182804 | 2383 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
7be57fc6 RA |
2384 | { |
2385 | int i; | |
2386 | struct nlattr *stats; | |
2387 | ||
2388 | struct nla_map { | |
2389 | u32 key; | |
2390 | u32 val; | |
2391 | }; | |
2392 | ||
2393 | struct nla_map map[] = { | |
95901122 | 2394 | {TIPC_NLA_STATS_RX_INFO, 0}, |
7be57fc6 RA |
2395 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, |
2396 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
2397 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
2398 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
95901122 | 2399 | {TIPC_NLA_STATS_TX_INFO, 0}, |
7be57fc6 RA |
2400 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, |
2401 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
2402 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
2403 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
2404 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
2405 | s->msg_length_counts : 1}, | |
2406 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
2407 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
2408 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
2409 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
2410 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
2411 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
2412 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
2413 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
2414 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
2415 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
2416 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
2417 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
2418 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
2419 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
2420 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
2421 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
2422 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
2423 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
2424 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
2425 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
2426 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
2427 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
2428 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
2429 | }; | |
2430 | ||
ae0be8de | 2431 | stats = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS); |
7be57fc6 RA |
2432 | if (!stats) |
2433 | return -EMSGSIZE; | |
2434 | ||
2435 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2436 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2437 | goto msg_full; | |
2438 | ||
2439 | nla_nest_end(skb, stats); | |
2440 | ||
2441 | return 0; | |
2442 | msg_full: | |
2443 | nla_nest_cancel(skb, stats); | |
2444 | ||
2445 | return -EMSGSIZE; | |
2446 | } | |
2447 | ||
2448 | /* Caller should hold appropriate locks to protect the link */ | |
5be9c086 JPM |
2449 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
2450 | struct tipc_link *link, int nlflags) | |
7be57fc6 | 2451 | { |
23fd3eac | 2452 | u32 self = tipc_own_addr(net); |
7be57fc6 RA |
2453 | struct nlattr *attrs; |
2454 | struct nlattr *prop; | |
23fd3eac JM |
2455 | void *hdr; |
2456 | int err; | |
7be57fc6 | 2457 | |
bfb3e5dd | 2458 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 2459 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
2460 | if (!hdr) |
2461 | return -EMSGSIZE; | |
2462 | ||
ae0be8de | 2463 | attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK); |
7be57fc6 RA |
2464 | if (!attrs) |
2465 | goto msg_full; | |
2466 | ||
2467 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2468 | goto attr_msg_full; | |
23fd3eac | 2469 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, tipc_cluster_mask(self))) |
7be57fc6 | 2470 | goto attr_msg_full; |
ed193ece | 2471 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 2472 | goto attr_msg_full; |
95901122 | 2473 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts)) |
7be57fc6 | 2474 | goto attr_msg_full; |
95901122 | 2475 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts)) |
7be57fc6 RA |
2476 | goto attr_msg_full; |
2477 | ||
2478 | if (tipc_link_is_up(link)) | |
2479 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2480 | goto attr_msg_full; | |
c72fa872 | 2481 | if (link->active) |
7be57fc6 RA |
2482 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
2483 | goto attr_msg_full; | |
2484 | ||
ae0be8de | 2485 | prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP); |
7be57fc6 RA |
2486 | if (!prop) |
2487 | goto attr_msg_full; | |
2488 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2489 | goto prop_msg_full; | |
2490 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2491 | goto prop_msg_full; | |
2492 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 2493 | link->window)) |
7be57fc6 RA |
2494 | goto prop_msg_full; |
2495 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2496 | goto prop_msg_full; | |
2497 | nla_nest_end(msg->skb, prop); | |
2498 | ||
2499 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2500 | if (err) | |
2501 | goto attr_msg_full; | |
2502 | ||
2503 | nla_nest_end(msg->skb, attrs); | |
2504 | genlmsg_end(msg->skb, hdr); | |
2505 | ||
2506 | return 0; | |
2507 | ||
2508 | prop_msg_full: | |
2509 | nla_nest_cancel(msg->skb, prop); | |
2510 | attr_msg_full: | |
2511 | nla_nest_cancel(msg->skb, attrs); | |
2512 | msg_full: | |
2513 | genlmsg_cancel(msg->skb, hdr); | |
2514 | ||
2515 | return -EMSGSIZE; | |
2516 | } | |
38206d59 JPM |
2517 | |
2518 | static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, | |
2519 | struct tipc_stats *stats) | |
2520 | { | |
2521 | int i; | |
2522 | struct nlattr *nest; | |
2523 | ||
2524 | struct nla_map { | |
2525 | __u32 key; | |
2526 | __u32 val; | |
2527 | }; | |
2528 | ||
2529 | struct nla_map map[] = { | |
95901122 | 2530 | {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts}, |
38206d59 JPM |
2531 | {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, |
2532 | {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, | |
2533 | {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, | |
2534 | {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, | |
95901122 | 2535 | {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts}, |
38206d59 JPM |
2536 | {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, |
2537 | {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, | |
2538 | {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, | |
2539 | {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, | |
2540 | {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, | |
2541 | {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, | |
2542 | {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, | |
2543 | {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, | |
2544 | {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, | |
2545 | {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, | |
2546 | {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, | |
2547 | {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, | |
2548 | {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? | |
2549 | (stats->accu_queue_sz / stats->queue_sz_counts) : 0} | |
2550 | }; | |
2551 | ||
ae0be8de | 2552 | nest = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS); |
38206d59 JPM |
2553 | if (!nest) |
2554 | return -EMSGSIZE; | |
2555 | ||
2556 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2557 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2558 | goto msg_full; | |
2559 | ||
2560 | nla_nest_end(skb, nest); | |
2561 | ||
2562 | return 0; | |
2563 | msg_full: | |
2564 | nla_nest_cancel(skb, nest); | |
2565 | ||
2566 | return -EMSGSIZE; | |
2567 | } | |
2568 | ||
2569 | int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg) | |
2570 | { | |
2571 | int err; | |
2572 | void *hdr; | |
2573 | struct nlattr *attrs; | |
2574 | struct nlattr *prop; | |
2575 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
02ec6caf HL |
2576 | u32 bc_mode = tipc_bcast_get_broadcast_mode(net); |
2577 | u32 bc_ratio = tipc_bcast_get_broadcast_ratio(net); | |
38206d59 JPM |
2578 | struct tipc_link *bcl = tn->bcl; |
2579 | ||
2580 | if (!bcl) | |
2581 | return 0; | |
2582 | ||
2583 | tipc_bcast_lock(net); | |
2584 | ||
2585 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, | |
2586 | NLM_F_MULTI, TIPC_NL_LINK_GET); | |
b53ce3e7 IY |
2587 | if (!hdr) { |
2588 | tipc_bcast_unlock(net); | |
38206d59 | 2589 | return -EMSGSIZE; |
b53ce3e7 | 2590 | } |
38206d59 | 2591 | |
ae0be8de | 2592 | attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK); |
38206d59 JPM |
2593 | if (!attrs) |
2594 | goto msg_full; | |
2595 | ||
2596 | /* The broadcast link is always up */ | |
2597 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2598 | goto attr_msg_full; | |
2599 | ||
2600 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) | |
2601 | goto attr_msg_full; | |
2602 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) | |
2603 | goto attr_msg_full; | |
95901122 | 2604 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0)) |
38206d59 | 2605 | goto attr_msg_full; |
95901122 | 2606 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0)) |
38206d59 JPM |
2607 | goto attr_msg_full; |
2608 | ||
ae0be8de | 2609 | prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP); |
38206d59 JPM |
2610 | if (!prop) |
2611 | goto attr_msg_full; | |
2612 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window)) | |
2613 | goto prop_msg_full; | |
02ec6caf HL |
2614 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST, bc_mode)) |
2615 | goto prop_msg_full; | |
2616 | if (bc_mode & BCLINK_MODE_SEL) | |
2617 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST_RATIO, | |
2618 | bc_ratio)) | |
2619 | goto prop_msg_full; | |
38206d59 JPM |
2620 | nla_nest_end(msg->skb, prop); |
2621 | ||
2622 | err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); | |
2623 | if (err) | |
2624 | goto attr_msg_full; | |
2625 | ||
2626 | tipc_bcast_unlock(net); | |
2627 | nla_nest_end(msg->skb, attrs); | |
2628 | genlmsg_end(msg->skb, hdr); | |
2629 | ||
2630 | return 0; | |
2631 | ||
2632 | prop_msg_full: | |
2633 | nla_nest_cancel(msg->skb, prop); | |
2634 | attr_msg_full: | |
2635 | nla_nest_cancel(msg->skb, attrs); | |
2636 | msg_full: | |
2637 | tipc_bcast_unlock(net); | |
2638 | genlmsg_cancel(msg->skb, hdr); | |
2639 | ||
2640 | return -EMSGSIZE; | |
2641 | } | |
2642 | ||
d01332f1 RA |
2643 | void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, |
2644 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2645 | { |
2646 | l->tolerance = tol; | |
047491ea JM |
2647 | if (l->bc_rcvlink) |
2648 | l->bc_rcvlink->tolerance = tol; | |
37c64cf6 JM |
2649 | if (link_is_up(l)) |
2650 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, tol, 0, xmitq); | |
38206d59 JPM |
2651 | } |
2652 | ||
d01332f1 RA |
2653 | void tipc_link_set_prio(struct tipc_link *l, u32 prio, |
2654 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2655 | { |
2656 | l->priority = prio; | |
8d6e79d3 | 2657 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, prio, xmitq); |
38206d59 JPM |
2658 | } |
2659 | ||
2660 | void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) | |
2661 | { | |
2662 | l->abort_limit = limit; | |
2663 | } | |
b4b9771b TL |
2664 | |
2665 | char *tipc_link_name_ext(struct tipc_link *l, char *buf) | |
2666 | { | |
2667 | if (!l) | |
2668 | scnprintf(buf, TIPC_MAX_LINK_NAME, "null"); | |
2669 | else if (link_is_bc_sndlink(l)) | |
2670 | scnprintf(buf, TIPC_MAX_LINK_NAME, "broadcast-sender"); | |
2671 | else if (link_is_bc_rcvlink(l)) | |
2672 | scnprintf(buf, TIPC_MAX_LINK_NAME, | |
2673 | "broadcast-receiver, peer %x", l->addr); | |
2674 | else | |
2675 | memcpy(buf, l->name, TIPC_MAX_LINK_NAME); | |
2676 | ||
2677 | return buf; | |
2678 | } | |
2679 | ||
2680 | /** | |
2681 | * tipc_link_dump - dump TIPC link data | |
2682 | * @l: tipc link to be dumped | |
2683 | * @dqueues: bitmask to decide if any link queue to be dumped? | |
2684 | * - TIPC_DUMP_NONE: don't dump link queues | |
2685 | * - TIPC_DUMP_TRANSMQ: dump link transmq queue | |
2686 | * - TIPC_DUMP_BACKLOGQ: dump link backlog queue | |
2687 | * - TIPC_DUMP_DEFERDQ: dump link deferd queue | |
2688 | * - TIPC_DUMP_INPUTQ: dump link input queue | |
2689 | * - TIPC_DUMP_WAKEUP: dump link wakeup queue | |
2690 | * - TIPC_DUMP_ALL: dump all the link queues above | |
2691 | * @buf: returned buffer of dump data in format | |
2692 | */ | |
2693 | int tipc_link_dump(struct tipc_link *l, u16 dqueues, char *buf) | |
2694 | { | |
2695 | int i = 0; | |
2696 | size_t sz = (dqueues) ? LINK_LMAX : LINK_LMIN; | |
2697 | struct sk_buff_head *list; | |
2698 | struct sk_buff *hskb, *tskb; | |
2699 | u32 len; | |
2700 | ||
2701 | if (!l) { | |
2702 | i += scnprintf(buf, sz, "link data: (null)\n"); | |
2703 | return i; | |
2704 | } | |
2705 | ||
2706 | i += scnprintf(buf, sz, "link data: %x", l->addr); | |
2707 | i += scnprintf(buf + i, sz - i, " %x", l->state); | |
2708 | i += scnprintf(buf + i, sz - i, " %u", l->in_session); | |
2709 | i += scnprintf(buf + i, sz - i, " %u", l->session); | |
2710 | i += scnprintf(buf + i, sz - i, " %u", l->peer_session); | |
2711 | i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt); | |
2712 | i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt); | |
2713 | i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt_state); | |
2714 | i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt_state); | |
2715 | i += scnprintf(buf + i, sz - i, " %x", l->peer_caps); | |
2716 | i += scnprintf(buf + i, sz - i, " %u", l->silent_intv_cnt); | |
2717 | i += scnprintf(buf + i, sz - i, " %u", l->rst_cnt); | |
71204231 | 2718 | i += scnprintf(buf + i, sz - i, " %u", 0); |
77cf8edb | 2719 | i += scnprintf(buf + i, sz - i, " %u", 0); |
b4b9771b TL |
2720 | i += scnprintf(buf + i, sz - i, " %u", l->acked); |
2721 | ||
2722 | list = &l->transmq; | |
2723 | len = skb_queue_len(list); | |
2724 | hskb = skb_peek(list); | |
2725 | tskb = skb_peek_tail(list); | |
2726 | i += scnprintf(buf + i, sz - i, " | %u %u %u", len, | |
2727 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2728 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2729 | ||
2730 | list = &l->deferdq; | |
2731 | len = skb_queue_len(list); | |
2732 | hskb = skb_peek(list); | |
2733 | tskb = skb_peek_tail(list); | |
2734 | i += scnprintf(buf + i, sz - i, " | %u %u %u", len, | |
2735 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2736 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2737 | ||
2738 | list = &l->backlogq; | |
2739 | len = skb_queue_len(list); | |
2740 | hskb = skb_peek(list); | |
2741 | tskb = skb_peek_tail(list); | |
2742 | i += scnprintf(buf + i, sz - i, " | %u %u %u", len, | |
2743 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2744 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2745 | ||
2746 | list = l->inputq; | |
2747 | len = skb_queue_len(list); | |
2748 | hskb = skb_peek(list); | |
2749 | tskb = skb_peek_tail(list); | |
2750 | i += scnprintf(buf + i, sz - i, " | %u %u %u\n", len, | |
2751 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2752 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2753 | ||
2754 | if (dqueues & TIPC_DUMP_TRANSMQ) { | |
2755 | i += scnprintf(buf + i, sz - i, "transmq: "); | |
2756 | i += tipc_list_dump(&l->transmq, false, buf + i); | |
2757 | } | |
2758 | if (dqueues & TIPC_DUMP_BACKLOGQ) { | |
2759 | i += scnprintf(buf + i, sz - i, | |
2760 | "backlogq: <%u %u %u %u %u>, ", | |
2761 | l->backlog[TIPC_LOW_IMPORTANCE].len, | |
2762 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len, | |
2763 | l->backlog[TIPC_HIGH_IMPORTANCE].len, | |
2764 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len, | |
2765 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len); | |
2766 | i += tipc_list_dump(&l->backlogq, false, buf + i); | |
2767 | } | |
2768 | if (dqueues & TIPC_DUMP_DEFERDQ) { | |
2769 | i += scnprintf(buf + i, sz - i, "deferdq: "); | |
2770 | i += tipc_list_dump(&l->deferdq, false, buf + i); | |
2771 | } | |
2772 | if (dqueues & TIPC_DUMP_INPUTQ) { | |
2773 | i += scnprintf(buf + i, sz - i, "inputq: "); | |
2774 | i += tipc_list_dump(l->inputq, false, buf + i); | |
2775 | } | |
2776 | if (dqueues & TIPC_DUMP_WAKEUP) { | |
2777 | i += scnprintf(buf + i, sz - i, "wakeup: "); | |
2778 | i += tipc_list_dump(&l->wakeupq, false, buf + i); | |
2779 | } | |
2780 | ||
2781 | return i; | |
2782 | } |