Commit | Line | Data |
---|---|---|
17926a79 DH |
1 | /* Management of Tx window, Tx resend, ACKs and out-of-sequence reception |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/circ_buf.h> | |
14 | #include <linux/net.h> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/udp.h> | |
17 | #include <net/sock.h> | |
18 | #include <net/af_rxrpc.h> | |
19 | #include "ar-internal.h" | |
20 | ||
21 | static unsigned rxrpc_ack_defer = 1; | |
22 | ||
23 | static const char *rxrpc_acks[] = { | |
24 | "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY", "IDL", | |
25 | "-?-" | |
26 | }; | |
27 | ||
28 | static const s8 rxrpc_ack_priority[] = { | |
29 | [0] = 0, | |
30 | [RXRPC_ACK_DELAY] = 1, | |
31 | [RXRPC_ACK_REQUESTED] = 2, | |
32 | [RXRPC_ACK_IDLE] = 3, | |
33 | [RXRPC_ACK_PING_RESPONSE] = 4, | |
34 | [RXRPC_ACK_DUPLICATE] = 5, | |
35 | [RXRPC_ACK_OUT_OF_SEQUENCE] = 6, | |
36 | [RXRPC_ACK_EXCEEDS_WINDOW] = 7, | |
37 | [RXRPC_ACK_NOSPACE] = 8, | |
38 | }; | |
39 | ||
40 | /* | |
41 | * propose an ACK be sent | |
42 | */ | |
43 | void __rxrpc_propose_ACK(struct rxrpc_call *call, uint8_t ack_reason, | |
44 | __be32 serial, bool immediate) | |
45 | { | |
46 | unsigned long expiry; | |
47 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
48 | ||
49 | ASSERTCMP(prior, >, 0); | |
50 | ||
51 | _enter("{%d},%s,%%%x,%u", | |
52 | call->debug_id, rxrpc_acks[ack_reason], ntohl(serial), | |
53 | immediate); | |
54 | ||
55 | if (prior < rxrpc_ack_priority[call->ackr_reason]) { | |
56 | if (immediate) | |
57 | goto cancel_timer; | |
58 | return; | |
59 | } | |
60 | ||
61 | /* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial | |
62 | * numbers */ | |
63 | if (prior == rxrpc_ack_priority[call->ackr_reason]) { | |
64 | if (prior <= 4) | |
65 | call->ackr_serial = serial; | |
66 | if (immediate) | |
67 | goto cancel_timer; | |
68 | return; | |
69 | } | |
70 | ||
71 | call->ackr_reason = ack_reason; | |
72 | call->ackr_serial = serial; | |
73 | ||
74 | switch (ack_reason) { | |
75 | case RXRPC_ACK_DELAY: | |
76 | _debug("run delay timer"); | |
77 | call->ack_timer.expires = jiffies + rxrpc_ack_timeout * HZ; | |
78 | add_timer(&call->ack_timer); | |
79 | return; | |
80 | ||
81 | case RXRPC_ACK_IDLE: | |
82 | if (!immediate) { | |
83 | _debug("run defer timer"); | |
84 | expiry = 1; | |
85 | goto run_timer; | |
86 | } | |
87 | goto cancel_timer; | |
88 | ||
89 | case RXRPC_ACK_REQUESTED: | |
90 | if (!rxrpc_ack_defer) | |
91 | goto cancel_timer; | |
92 | if (!immediate || serial == cpu_to_be32(1)) { | |
93 | _debug("run defer timer"); | |
94 | expiry = rxrpc_ack_defer; | |
95 | goto run_timer; | |
96 | } | |
97 | ||
98 | default: | |
99 | _debug("immediate ACK"); | |
100 | goto cancel_timer; | |
101 | } | |
102 | ||
103 | run_timer: | |
104 | expiry += jiffies; | |
105 | if (!timer_pending(&call->ack_timer) || | |
106 | time_after(call->ack_timer.expires, expiry)) | |
107 | mod_timer(&call->ack_timer, expiry); | |
108 | return; | |
109 | ||
110 | cancel_timer: | |
111 | _debug("cancel timer %%%u", ntohl(serial)); | |
112 | try_to_del_timer_sync(&call->ack_timer); | |
113 | read_lock_bh(&call->state_lock); | |
114 | if (call->state <= RXRPC_CALL_COMPLETE && | |
115 | !test_and_set_bit(RXRPC_CALL_ACK, &call->events)) | |
651350d1 | 116 | rxrpc_queue_call(call); |
17926a79 DH |
117 | read_unlock_bh(&call->state_lock); |
118 | } | |
119 | ||
120 | /* | |
121 | * propose an ACK be sent, locking the call structure | |
122 | */ | |
123 | void rxrpc_propose_ACK(struct rxrpc_call *call, uint8_t ack_reason, | |
124 | __be32 serial, bool immediate) | |
125 | { | |
126 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
127 | ||
128 | if (prior > rxrpc_ack_priority[call->ackr_reason]) { | |
129 | spin_lock_bh(&call->lock); | |
130 | __rxrpc_propose_ACK(call, ack_reason, serial, immediate); | |
131 | spin_unlock_bh(&call->lock); | |
132 | } | |
133 | } | |
134 | ||
135 | /* | |
136 | * set the resend timer | |
137 | */ | |
138 | static void rxrpc_set_resend(struct rxrpc_call *call, u8 resend, | |
139 | unsigned long resend_at) | |
140 | { | |
141 | read_lock_bh(&call->state_lock); | |
142 | if (call->state >= RXRPC_CALL_COMPLETE) | |
143 | resend = 0; | |
144 | ||
145 | if (resend & 1) { | |
146 | _debug("SET RESEND"); | |
147 | set_bit(RXRPC_CALL_RESEND, &call->events); | |
148 | } | |
149 | ||
150 | if (resend & 2) { | |
151 | _debug("MODIFY RESEND TIMER"); | |
152 | set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
153 | mod_timer(&call->resend_timer, resend_at); | |
154 | } else { | |
155 | _debug("KILL RESEND TIMER"); | |
156 | del_timer_sync(&call->resend_timer); | |
157 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); | |
158 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
159 | } | |
160 | read_unlock_bh(&call->state_lock); | |
161 | } | |
162 | ||
163 | /* | |
164 | * resend packets | |
165 | */ | |
166 | static void rxrpc_resend(struct rxrpc_call *call) | |
167 | { | |
168 | struct rxrpc_skb_priv *sp; | |
169 | struct rxrpc_header *hdr; | |
170 | struct sk_buff *txb; | |
171 | unsigned long *p_txb, resend_at; | |
172 | int loop, stop; | |
173 | u8 resend; | |
174 | ||
175 | _enter("{%d,%d,%d,%d},", | |
176 | call->acks_hard, call->acks_unacked, | |
177 | atomic_read(&call->sequence), | |
178 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
179 | ||
180 | stop = 0; | |
181 | resend = 0; | |
182 | resend_at = 0; | |
183 | ||
184 | for (loop = call->acks_tail; | |
185 | loop != call->acks_head || stop; | |
186 | loop = (loop + 1) & (call->acks_winsz - 1) | |
187 | ) { | |
188 | p_txb = call->acks_window + loop; | |
189 | smp_read_barrier_depends(); | |
190 | if (*p_txb & 1) | |
191 | continue; | |
192 | ||
193 | txb = (struct sk_buff *) *p_txb; | |
194 | sp = rxrpc_skb(txb); | |
195 | ||
196 | if (sp->need_resend) { | |
197 | sp->need_resend = 0; | |
198 | ||
199 | /* each Tx packet has a new serial number */ | |
200 | sp->hdr.serial = | |
201 | htonl(atomic_inc_return(&call->conn->serial)); | |
202 | ||
203 | hdr = (struct rxrpc_header *) txb->head; | |
204 | hdr->serial = sp->hdr.serial; | |
205 | ||
206 | _proto("Tx DATA %%%u { #%d }", | |
207 | ntohl(sp->hdr.serial), ntohl(sp->hdr.seq)); | |
208 | if (rxrpc_send_packet(call->conn->trans, txb) < 0) { | |
209 | stop = 0; | |
210 | sp->resend_at = jiffies + 3; | |
211 | } else { | |
212 | sp->resend_at = | |
213 | jiffies + rxrpc_resend_timeout * HZ; | |
214 | } | |
215 | } | |
216 | ||
217 | if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
218 | sp->need_resend = 1; | |
219 | resend |= 1; | |
220 | } else if (resend & 2) { | |
221 | if (time_before(sp->resend_at, resend_at)) | |
222 | resend_at = sp->resend_at; | |
223 | } else { | |
224 | resend_at = sp->resend_at; | |
225 | resend |= 2; | |
226 | } | |
227 | } | |
228 | ||
229 | rxrpc_set_resend(call, resend, resend_at); | |
230 | _leave(""); | |
231 | } | |
232 | ||
233 | /* | |
234 | * handle resend timer expiry | |
235 | */ | |
236 | static void rxrpc_resend_timer(struct rxrpc_call *call) | |
237 | { | |
238 | struct rxrpc_skb_priv *sp; | |
239 | struct sk_buff *txb; | |
240 | unsigned long *p_txb, resend_at; | |
241 | int loop; | |
242 | u8 resend; | |
243 | ||
244 | _enter("%d,%d,%d", | |
245 | call->acks_tail, call->acks_unacked, call->acks_head); | |
246 | ||
247 | resend = 0; | |
248 | resend_at = 0; | |
249 | ||
250 | for (loop = call->acks_unacked; | |
251 | loop != call->acks_head; | |
252 | loop = (loop + 1) & (call->acks_winsz - 1) | |
253 | ) { | |
254 | p_txb = call->acks_window + loop; | |
255 | smp_read_barrier_depends(); | |
256 | txb = (struct sk_buff *) (*p_txb & ~1); | |
257 | sp = rxrpc_skb(txb); | |
258 | ||
259 | ASSERT(!(*p_txb & 1)); | |
260 | ||
261 | if (sp->need_resend) { | |
262 | ; | |
263 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
264 | sp->need_resend = 1; | |
265 | resend |= 1; | |
266 | } else if (resend & 2) { | |
267 | if (time_before(sp->resend_at, resend_at)) | |
268 | resend_at = sp->resend_at; | |
269 | } else { | |
270 | resend_at = sp->resend_at; | |
271 | resend |= 2; | |
272 | } | |
273 | } | |
274 | ||
275 | rxrpc_set_resend(call, resend, resend_at); | |
276 | _leave(""); | |
277 | } | |
278 | ||
279 | /* | |
280 | * process soft ACKs of our transmitted packets | |
281 | * - these indicate packets the peer has or has not received, but hasn't yet | |
282 | * given to the consumer, and so can still be discarded and re-requested | |
283 | */ | |
284 | static int rxrpc_process_soft_ACKs(struct rxrpc_call *call, | |
285 | struct rxrpc_ackpacket *ack, | |
286 | struct sk_buff *skb) | |
287 | { | |
288 | struct rxrpc_skb_priv *sp; | |
289 | struct sk_buff *txb; | |
290 | unsigned long *p_txb, resend_at; | |
291 | int loop; | |
292 | u8 sacks[RXRPC_MAXACKS], resend; | |
293 | ||
294 | _enter("{%d,%d},{%d},", | |
295 | call->acks_hard, | |
296 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz), | |
297 | ack->nAcks); | |
298 | ||
299 | if (skb_copy_bits(skb, 0, sacks, ack->nAcks) < 0) | |
300 | goto protocol_error; | |
301 | ||
302 | resend = 0; | |
303 | resend_at = 0; | |
304 | for (loop = 0; loop < ack->nAcks; loop++) { | |
305 | p_txb = call->acks_window; | |
306 | p_txb += (call->acks_tail + loop) & (call->acks_winsz - 1); | |
307 | smp_read_barrier_depends(); | |
308 | txb = (struct sk_buff *) (*p_txb & ~1); | |
309 | sp = rxrpc_skb(txb); | |
310 | ||
311 | switch (sacks[loop]) { | |
312 | case RXRPC_ACK_TYPE_ACK: | |
313 | sp->need_resend = 0; | |
314 | *p_txb |= 1; | |
315 | break; | |
316 | case RXRPC_ACK_TYPE_NACK: | |
317 | sp->need_resend = 1; | |
318 | *p_txb &= ~1; | |
319 | resend = 1; | |
320 | break; | |
321 | default: | |
322 | _debug("Unsupported ACK type %d", sacks[loop]); | |
323 | goto protocol_error; | |
324 | } | |
325 | } | |
326 | ||
327 | smp_mb(); | |
328 | call->acks_unacked = (call->acks_tail + loop) & (call->acks_winsz - 1); | |
329 | ||
330 | /* anything not explicitly ACK'd is implicitly NACK'd, but may just not | |
331 | * have been received or processed yet by the far end */ | |
332 | for (loop = call->acks_unacked; | |
333 | loop != call->acks_head; | |
334 | loop = (loop + 1) & (call->acks_winsz - 1) | |
335 | ) { | |
336 | p_txb = call->acks_window + loop; | |
337 | smp_read_barrier_depends(); | |
338 | txb = (struct sk_buff *) (*p_txb & ~1); | |
339 | sp = rxrpc_skb(txb); | |
340 | ||
341 | if (*p_txb & 1) { | |
342 | /* packet must have been discarded */ | |
343 | sp->need_resend = 1; | |
344 | *p_txb &= ~1; | |
345 | resend |= 1; | |
346 | } else if (sp->need_resend) { | |
347 | ; | |
348 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
349 | sp->need_resend = 1; | |
350 | resend |= 1; | |
351 | } else if (resend & 2) { | |
352 | if (time_before(sp->resend_at, resend_at)) | |
353 | resend_at = sp->resend_at; | |
354 | } else { | |
355 | resend_at = sp->resend_at; | |
356 | resend |= 2; | |
357 | } | |
358 | } | |
359 | ||
360 | rxrpc_set_resend(call, resend, resend_at); | |
361 | _leave(" = 0"); | |
362 | return 0; | |
363 | ||
364 | protocol_error: | |
365 | _leave(" = -EPROTO"); | |
366 | return -EPROTO; | |
367 | } | |
368 | ||
369 | /* | |
370 | * discard hard-ACK'd packets from the Tx window | |
371 | */ | |
372 | static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard) | |
373 | { | |
374 | struct rxrpc_skb_priv *sp; | |
375 | unsigned long _skb; | |
376 | int tail = call->acks_tail, old_tail; | |
377 | int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz); | |
378 | ||
379 | _enter("{%u,%u},%u", call->acks_hard, win, hard); | |
380 | ||
381 | ASSERTCMP(hard - call->acks_hard, <=, win); | |
382 | ||
383 | while (call->acks_hard < hard) { | |
384 | smp_read_barrier_depends(); | |
385 | _skb = call->acks_window[tail] & ~1; | |
386 | sp = rxrpc_skb((struct sk_buff *) _skb); | |
387 | rxrpc_free_skb((struct sk_buff *) _skb); | |
388 | old_tail = tail; | |
389 | tail = (tail + 1) & (call->acks_winsz - 1); | |
390 | call->acks_tail = tail; | |
391 | if (call->acks_unacked == old_tail) | |
392 | call->acks_unacked = tail; | |
393 | call->acks_hard++; | |
394 | } | |
395 | ||
396 | wake_up(&call->tx_waitq); | |
397 | } | |
398 | ||
399 | /* | |
400 | * clear the Tx window in the event of a failure | |
401 | */ | |
402 | static void rxrpc_clear_tx_window(struct rxrpc_call *call) | |
403 | { | |
404 | rxrpc_rotate_tx_window(call, atomic_read(&call->sequence)); | |
405 | } | |
406 | ||
407 | /* | |
408 | * drain the out of sequence received packet queue into the packet Rx queue | |
409 | */ | |
410 | static int rxrpc_drain_rx_oos_queue(struct rxrpc_call *call) | |
411 | { | |
412 | struct rxrpc_skb_priv *sp; | |
413 | struct sk_buff *skb; | |
414 | bool terminal; | |
415 | int ret; | |
416 | ||
417 | _enter("{%d,%d}", call->rx_data_post, call->rx_first_oos); | |
418 | ||
419 | spin_lock_bh(&call->lock); | |
420 | ||
421 | ret = -ECONNRESET; | |
422 | if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
423 | goto socket_unavailable; | |
424 | ||
425 | skb = skb_dequeue(&call->rx_oos_queue); | |
426 | if (skb) { | |
427 | sp = rxrpc_skb(skb); | |
428 | ||
429 | _debug("drain OOS packet %d [%d]", | |
430 | ntohl(sp->hdr.seq), call->rx_first_oos); | |
431 | ||
432 | if (ntohl(sp->hdr.seq) != call->rx_first_oos) { | |
433 | skb_queue_head(&call->rx_oos_queue, skb); | |
434 | call->rx_first_oos = ntohl(rxrpc_skb(skb)->hdr.seq); | |
435 | _debug("requeue %p {%u}", skb, call->rx_first_oos); | |
436 | } else { | |
437 | skb->mark = RXRPC_SKB_MARK_DATA; | |
438 | terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && | |
439 | !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); | |
440 | ret = rxrpc_queue_rcv_skb(call, skb, true, terminal); | |
441 | BUG_ON(ret < 0); | |
442 | _debug("drain #%u", call->rx_data_post); | |
443 | call->rx_data_post++; | |
444 | ||
445 | /* find out what the next packet is */ | |
446 | skb = skb_peek(&call->rx_oos_queue); | |
447 | if (skb) | |
448 | call->rx_first_oos = | |
449 | ntohl(rxrpc_skb(skb)->hdr.seq); | |
450 | else | |
451 | call->rx_first_oos = 0; | |
452 | _debug("peek %p {%u}", skb, call->rx_first_oos); | |
453 | } | |
454 | } | |
455 | ||
456 | ret = 0; | |
457 | socket_unavailable: | |
458 | spin_unlock_bh(&call->lock); | |
459 | _leave(" = %d", ret); | |
460 | return ret; | |
461 | } | |
462 | ||
463 | /* | |
464 | * insert an out of sequence packet into the buffer | |
465 | */ | |
466 | static void rxrpc_insert_oos_packet(struct rxrpc_call *call, | |
467 | struct sk_buff *skb) | |
468 | { | |
469 | struct rxrpc_skb_priv *sp, *psp; | |
470 | struct sk_buff *p; | |
471 | u32 seq; | |
472 | ||
473 | sp = rxrpc_skb(skb); | |
474 | seq = ntohl(sp->hdr.seq); | |
475 | _enter(",,{%u}", seq); | |
476 | ||
477 | skb->destructor = rxrpc_packet_destructor; | |
478 | ASSERTCMP(sp->call, ==, NULL); | |
479 | sp->call = call; | |
480 | rxrpc_get_call(call); | |
481 | ||
482 | /* insert into the buffer in sequence order */ | |
483 | spin_lock_bh(&call->lock); | |
484 | ||
485 | skb_queue_walk(&call->rx_oos_queue, p) { | |
486 | psp = rxrpc_skb(p); | |
487 | if (ntohl(psp->hdr.seq) > seq) { | |
488 | _debug("insert oos #%u before #%u", | |
489 | seq, ntohl(psp->hdr.seq)); | |
490 | skb_insert(p, skb, &call->rx_oos_queue); | |
491 | goto inserted; | |
492 | } | |
493 | } | |
494 | ||
495 | _debug("append oos #%u", seq); | |
496 | skb_queue_tail(&call->rx_oos_queue, skb); | |
497 | inserted: | |
498 | ||
499 | /* we might now have a new front to the queue */ | |
500 | if (call->rx_first_oos == 0 || seq < call->rx_first_oos) | |
501 | call->rx_first_oos = seq; | |
502 | ||
503 | read_lock(&call->state_lock); | |
504 | if (call->state < RXRPC_CALL_COMPLETE && | |
505 | call->rx_data_post == call->rx_first_oos) { | |
506 | _debug("drain rx oos now"); | |
507 | set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events); | |
508 | } | |
509 | read_unlock(&call->state_lock); | |
510 | ||
511 | spin_unlock_bh(&call->lock); | |
512 | _leave(" [stored #%u]", call->rx_first_oos); | |
513 | } | |
514 | ||
515 | /* | |
516 | * clear the Tx window on final ACK reception | |
517 | */ | |
518 | static void rxrpc_zap_tx_window(struct rxrpc_call *call) | |
519 | { | |
520 | struct rxrpc_skb_priv *sp; | |
521 | struct sk_buff *skb; | |
522 | unsigned long _skb, *acks_window; | |
523 | uint8_t winsz = call->acks_winsz; | |
524 | int tail; | |
525 | ||
526 | acks_window = call->acks_window; | |
527 | call->acks_window = NULL; | |
528 | ||
529 | while (CIRC_CNT(call->acks_head, call->acks_tail, winsz) > 0) { | |
530 | tail = call->acks_tail; | |
531 | smp_read_barrier_depends(); | |
532 | _skb = acks_window[tail] & ~1; | |
533 | smp_mb(); | |
534 | call->acks_tail = (call->acks_tail + 1) & (winsz - 1); | |
535 | ||
536 | skb = (struct sk_buff *) _skb; | |
537 | sp = rxrpc_skb(skb); | |
538 | _debug("+++ clear Tx %u", ntohl(sp->hdr.seq)); | |
539 | rxrpc_free_skb(skb); | |
540 | } | |
541 | ||
542 | kfree(acks_window); | |
543 | } | |
544 | ||
545 | /* | |
546 | * process packets in the reception queue | |
547 | */ | |
548 | static int rxrpc_process_rx_queue(struct rxrpc_call *call, | |
549 | u32 *_abort_code) | |
550 | { | |
551 | struct rxrpc_ackpacket ack; | |
552 | struct rxrpc_skb_priv *sp; | |
553 | struct sk_buff *skb; | |
554 | bool post_ACK; | |
555 | int latest; | |
556 | u32 hard, tx; | |
557 | ||
558 | _enter(""); | |
559 | ||
560 | process_further: | |
561 | skb = skb_dequeue(&call->rx_queue); | |
562 | if (!skb) | |
563 | return -EAGAIN; | |
564 | ||
565 | _net("deferred skb %p", skb); | |
566 | ||
567 | sp = rxrpc_skb(skb); | |
568 | ||
569 | _debug("process %s [st %d]", rxrpc_pkts[sp->hdr.type], call->state); | |
570 | ||
571 | post_ACK = false; | |
572 | ||
573 | switch (sp->hdr.type) { | |
574 | /* data packets that wind up here have been received out of | |
575 | * order, need security processing or are jumbo packets */ | |
576 | case RXRPC_PACKET_TYPE_DATA: | |
577 | _proto("OOSQ DATA %%%u { #%u }", | |
578 | ntohl(sp->hdr.serial), ntohl(sp->hdr.seq)); | |
579 | ||
580 | /* secured packets must be verified and possibly decrypted */ | |
581 | if (rxrpc_verify_packet(call, skb, _abort_code) < 0) | |
582 | goto protocol_error; | |
583 | ||
584 | rxrpc_insert_oos_packet(call, skb); | |
585 | goto process_further; | |
586 | ||
587 | /* partial ACK to process */ | |
588 | case RXRPC_PACKET_TYPE_ACK: | |
589 | if (skb_copy_bits(skb, 0, &ack, sizeof(ack)) < 0) { | |
590 | _debug("extraction failure"); | |
591 | goto protocol_error; | |
592 | } | |
593 | if (!skb_pull(skb, sizeof(ack))) | |
594 | BUG(); | |
595 | ||
596 | latest = ntohl(sp->hdr.serial); | |
597 | hard = ntohl(ack.firstPacket); | |
598 | tx = atomic_read(&call->sequence); | |
599 | ||
600 | _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", | |
601 | latest, | |
602 | ntohs(ack.maxSkew), | |
603 | hard, | |
604 | ntohl(ack.previousPacket), | |
605 | ntohl(ack.serial), | |
606 | rxrpc_acks[ack.reason], | |
607 | ack.nAcks); | |
608 | ||
609 | if (ack.reason == RXRPC_ACK_PING) { | |
610 | _proto("Rx ACK %%%u PING Request", latest); | |
611 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, | |
612 | sp->hdr.serial, true); | |
613 | } | |
614 | ||
615 | /* discard any out-of-order or duplicate ACKs */ | |
616 | if (latest - call->acks_latest <= 0) { | |
617 | _debug("discard ACK %d <= %d", | |
618 | latest, call->acks_latest); | |
619 | goto discard; | |
620 | } | |
621 | call->acks_latest = latest; | |
622 | ||
623 | if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
624 | call->state != RXRPC_CALL_CLIENT_AWAIT_REPLY && | |
625 | call->state != RXRPC_CALL_SERVER_SEND_REPLY && | |
626 | call->state != RXRPC_CALL_SERVER_AWAIT_ACK) | |
627 | goto discard; | |
628 | ||
629 | _debug("Tx=%d H=%u S=%d", tx, call->acks_hard, call->state); | |
630 | ||
631 | if (hard > 0) { | |
632 | if (hard - 1 > tx) { | |
633 | _debug("hard-ACK'd packet %d not transmitted" | |
634 | " (%d top)", | |
635 | hard - 1, tx); | |
636 | goto protocol_error; | |
637 | } | |
638 | ||
639 | if ((call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY || | |
640 | call->state == RXRPC_CALL_SERVER_AWAIT_ACK) && | |
641 | hard > tx) | |
642 | goto all_acked; | |
643 | ||
644 | smp_rmb(); | |
645 | rxrpc_rotate_tx_window(call, hard - 1); | |
646 | } | |
647 | ||
648 | if (ack.nAcks > 0) { | |
649 | if (hard - 1 + ack.nAcks > tx) { | |
650 | _debug("soft-ACK'd packet %d+%d not" | |
651 | " transmitted (%d top)", | |
652 | hard - 1, ack.nAcks, tx); | |
653 | goto protocol_error; | |
654 | } | |
655 | ||
656 | if (rxrpc_process_soft_ACKs(call, &ack, skb) < 0) | |
657 | goto protocol_error; | |
658 | } | |
659 | goto discard; | |
660 | ||
661 | /* complete ACK to process */ | |
662 | case RXRPC_PACKET_TYPE_ACKALL: | |
663 | goto all_acked; | |
664 | ||
665 | /* abort and busy are handled elsewhere */ | |
666 | case RXRPC_PACKET_TYPE_BUSY: | |
667 | case RXRPC_PACKET_TYPE_ABORT: | |
668 | BUG(); | |
669 | ||
670 | /* connection level events - also handled elsewhere */ | |
671 | case RXRPC_PACKET_TYPE_CHALLENGE: | |
672 | case RXRPC_PACKET_TYPE_RESPONSE: | |
673 | case RXRPC_PACKET_TYPE_DEBUG: | |
674 | BUG(); | |
675 | } | |
676 | ||
677 | /* if we've had a hard ACK that covers all the packets we've sent, then | |
678 | * that ends that phase of the operation */ | |
679 | all_acked: | |
680 | write_lock_bh(&call->state_lock); | |
681 | _debug("ack all %d", call->state); | |
682 | ||
683 | switch (call->state) { | |
684 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
685 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
686 | break; | |
687 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
688 | _debug("srv complete"); | |
689 | call->state = RXRPC_CALL_COMPLETE; | |
690 | post_ACK = true; | |
691 | break; | |
692 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
693 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
694 | goto protocol_error_unlock; /* can't occur yet */ | |
695 | default: | |
696 | write_unlock_bh(&call->state_lock); | |
697 | goto discard; /* assume packet left over from earlier phase */ | |
698 | } | |
699 | ||
700 | write_unlock_bh(&call->state_lock); | |
701 | ||
702 | /* if all the packets we sent are hard-ACK'd, then we can discard | |
703 | * whatever we've got left */ | |
704 | _debug("clear Tx %d", | |
705 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
706 | ||
707 | del_timer_sync(&call->resend_timer); | |
708 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
709 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); | |
710 | ||
711 | if (call->acks_window) | |
712 | rxrpc_zap_tx_window(call); | |
713 | ||
714 | if (post_ACK) { | |
715 | /* post the final ACK message for userspace to pick up */ | |
716 | _debug("post ACK"); | |
717 | skb->mark = RXRPC_SKB_MARK_FINAL_ACK; | |
718 | sp->call = call; | |
719 | rxrpc_get_call(call); | |
720 | spin_lock_bh(&call->lock); | |
721 | if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0) | |
722 | BUG(); | |
723 | spin_unlock_bh(&call->lock); | |
724 | goto process_further; | |
725 | } | |
726 | ||
727 | discard: | |
728 | rxrpc_free_skb(skb); | |
729 | goto process_further; | |
730 | ||
731 | protocol_error_unlock: | |
732 | write_unlock_bh(&call->state_lock); | |
733 | protocol_error: | |
734 | rxrpc_free_skb(skb); | |
735 | _leave(" = -EPROTO"); | |
736 | return -EPROTO; | |
737 | } | |
738 | ||
739 | /* | |
740 | * post a message to the socket Rx queue for recvmsg() to pick up | |
741 | */ | |
742 | static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error, | |
743 | bool fatal) | |
744 | { | |
745 | struct rxrpc_skb_priv *sp; | |
746 | struct sk_buff *skb; | |
747 | int ret; | |
748 | ||
749 | _enter("{%d,%lx},%u,%u,%d", | |
750 | call->debug_id, call->flags, mark, error, fatal); | |
751 | ||
752 | /* remove timers and things for fatal messages */ | |
753 | if (fatal) { | |
754 | del_timer_sync(&call->resend_timer); | |
755 | del_timer_sync(&call->ack_timer); | |
756 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
757 | } | |
758 | ||
759 | if (mark != RXRPC_SKB_MARK_NEW_CALL && | |
760 | !test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
761 | _leave("[no userid]"); | |
762 | return 0; | |
763 | } | |
764 | ||
765 | if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { | |
766 | skb = alloc_skb(0, GFP_NOFS); | |
767 | if (!skb) | |
768 | return -ENOMEM; | |
769 | ||
770 | rxrpc_new_skb(skb); | |
771 | ||
772 | skb->mark = mark; | |
773 | ||
774 | sp = rxrpc_skb(skb); | |
775 | memset(sp, 0, sizeof(*sp)); | |
776 | sp->error = error; | |
777 | sp->call = call; | |
778 | rxrpc_get_call(call); | |
779 | ||
780 | spin_lock_bh(&call->lock); | |
781 | ret = rxrpc_queue_rcv_skb(call, skb, true, fatal); | |
782 | spin_unlock_bh(&call->lock); | |
783 | if (ret < 0) | |
784 | BUG(); | |
785 | } | |
786 | ||
787 | return 0; | |
788 | } | |
789 | ||
790 | /* | |
791 | * handle background processing of incoming call packets and ACK / abort | |
792 | * generation | |
793 | */ | |
794 | void rxrpc_process_call(struct work_struct *work) | |
795 | { | |
796 | struct rxrpc_call *call = | |
797 | container_of(work, struct rxrpc_call, processor); | |
798 | struct rxrpc_ackpacket ack; | |
799 | struct rxrpc_ackinfo ackinfo; | |
800 | struct rxrpc_header hdr; | |
801 | struct msghdr msg; | |
802 | struct kvec iov[5]; | |
803 | unsigned long bits; | |
804 | __be32 data; | |
805 | size_t len; | |
806 | int genbit, loop, nbit, ioc, ret; | |
807 | u32 abort_code = RX_PROTOCOL_ERROR; | |
808 | u8 *acks = NULL; | |
809 | ||
810 | //printk("\n--------------------\n"); | |
811 | _enter("{%d,%s,%lx} [%lu]", | |
812 | call->debug_id, rxrpc_call_states[call->state], call->events, | |
813 | (jiffies - call->creation_jif) / (HZ / 10)); | |
814 | ||
815 | if (test_and_set_bit(RXRPC_CALL_PROC_BUSY, &call->flags)) { | |
816 | _debug("XXXXXXXXXXXXX RUNNING ON MULTIPLE CPUS XXXXXXXXXXXXX"); | |
817 | return; | |
818 | } | |
819 | ||
820 | /* there's a good chance we're going to have to send a message, so set | |
821 | * one up in advance */ | |
822 | msg.msg_name = &call->conn->trans->peer->srx.transport.sin; | |
823 | msg.msg_namelen = sizeof(call->conn->trans->peer->srx.transport.sin); | |
824 | msg.msg_control = NULL; | |
825 | msg.msg_controllen = 0; | |
826 | msg.msg_flags = 0; | |
827 | ||
828 | hdr.epoch = call->conn->epoch; | |
829 | hdr.cid = call->cid; | |
830 | hdr.callNumber = call->call_id; | |
831 | hdr.seq = 0; | |
832 | hdr.type = RXRPC_PACKET_TYPE_ACK; | |
833 | hdr.flags = call->conn->out_clientflag; | |
834 | hdr.userStatus = 0; | |
835 | hdr.securityIndex = call->conn->security_ix; | |
836 | hdr._rsvd = 0; | |
837 | hdr.serviceId = call->conn->service_id; | |
838 | ||
839 | memset(iov, 0, sizeof(iov)); | |
840 | iov[0].iov_base = &hdr; | |
841 | iov[0].iov_len = sizeof(hdr); | |
842 | ||
843 | /* deal with events of a final nature */ | |
844 | if (test_bit(RXRPC_CALL_RELEASE, &call->events)) { | |
845 | rxrpc_release_call(call); | |
846 | clear_bit(RXRPC_CALL_RELEASE, &call->events); | |
847 | } | |
848 | ||
849 | if (test_bit(RXRPC_CALL_RCVD_ERROR, &call->events)) { | |
850 | int error; | |
851 | ||
852 | clear_bit(RXRPC_CALL_CONN_ABORT, &call->events); | |
853 | clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events); | |
854 | clear_bit(RXRPC_CALL_ABORT, &call->events); | |
855 | ||
856 | error = call->conn->trans->peer->net_error; | |
857 | _debug("post net error %d", error); | |
858 | ||
859 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NET_ERROR, | |
860 | error, true) < 0) | |
861 | goto no_mem; | |
862 | clear_bit(RXRPC_CALL_RCVD_ERROR, &call->events); | |
863 | goto kill_ACKs; | |
864 | } | |
865 | ||
866 | if (test_bit(RXRPC_CALL_CONN_ABORT, &call->events)) { | |
867 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); | |
868 | ||
869 | clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events); | |
870 | clear_bit(RXRPC_CALL_ABORT, &call->events); | |
871 | ||
872 | _debug("post conn abort"); | |
873 | ||
874 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
875 | call->conn->error, true) < 0) | |
876 | goto no_mem; | |
877 | clear_bit(RXRPC_CALL_CONN_ABORT, &call->events); | |
878 | goto kill_ACKs; | |
879 | } | |
880 | ||
881 | if (test_bit(RXRPC_CALL_REJECT_BUSY, &call->events)) { | |
882 | hdr.type = RXRPC_PACKET_TYPE_BUSY; | |
883 | genbit = RXRPC_CALL_REJECT_BUSY; | |
884 | goto send_message; | |
885 | } | |
886 | ||
887 | if (test_bit(RXRPC_CALL_ABORT, &call->events)) { | |
888 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); | |
889 | ||
890 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
891 | ECONNABORTED, true) < 0) | |
892 | goto no_mem; | |
893 | hdr.type = RXRPC_PACKET_TYPE_ABORT; | |
894 | data = htonl(call->abort_code); | |
895 | iov[1].iov_base = &data; | |
896 | iov[1].iov_len = sizeof(data); | |
897 | genbit = RXRPC_CALL_ABORT; | |
898 | goto send_message; | |
899 | } | |
900 | ||
901 | if (test_bit(RXRPC_CALL_ACK_FINAL, &call->events)) { | |
902 | hdr.type = RXRPC_PACKET_TYPE_ACKALL; | |
903 | genbit = RXRPC_CALL_ACK_FINAL; | |
904 | goto send_message; | |
905 | } | |
906 | ||
907 | if (call->events & ((1 << RXRPC_CALL_RCVD_BUSY) | | |
908 | (1 << RXRPC_CALL_RCVD_ABORT)) | |
909 | ) { | |
910 | u32 mark; | |
911 | ||
912 | if (test_bit(RXRPC_CALL_RCVD_ABORT, &call->events)) | |
913 | mark = RXRPC_SKB_MARK_REMOTE_ABORT; | |
914 | else | |
915 | mark = RXRPC_SKB_MARK_BUSY; | |
916 | ||
917 | _debug("post abort/busy"); | |
918 | rxrpc_clear_tx_window(call); | |
919 | if (rxrpc_post_message(call, mark, ECONNABORTED, true) < 0) | |
920 | goto no_mem; | |
921 | ||
922 | clear_bit(RXRPC_CALL_RCVD_BUSY, &call->events); | |
923 | clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events); | |
924 | goto kill_ACKs; | |
925 | } | |
926 | ||
927 | if (test_and_clear_bit(RXRPC_CALL_RCVD_ACKALL, &call->events)) { | |
928 | _debug("do implicit ackall"); | |
929 | rxrpc_clear_tx_window(call); | |
930 | } | |
931 | ||
932 | if (test_bit(RXRPC_CALL_LIFE_TIMER, &call->events)) { | |
933 | write_lock_bh(&call->state_lock); | |
934 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
935 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
936 | call->abort_code = RX_CALL_TIMEOUT; | |
937 | set_bit(RXRPC_CALL_ABORT, &call->events); | |
938 | } | |
939 | write_unlock_bh(&call->state_lock); | |
940 | ||
941 | _debug("post timeout"); | |
942 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
943 | ETIME, true) < 0) | |
944 | goto no_mem; | |
945 | ||
946 | clear_bit(RXRPC_CALL_LIFE_TIMER, &call->events); | |
947 | goto kill_ACKs; | |
948 | } | |
949 | ||
950 | /* deal with assorted inbound messages */ | |
951 | if (!skb_queue_empty(&call->rx_queue)) { | |
952 | switch (rxrpc_process_rx_queue(call, &abort_code)) { | |
953 | case 0: | |
954 | case -EAGAIN: | |
955 | break; | |
956 | case -ENOMEM: | |
957 | goto no_mem; | |
958 | case -EKEYEXPIRED: | |
959 | case -EKEYREJECTED: | |
960 | case -EPROTO: | |
961 | rxrpc_abort_call(call, abort_code); | |
962 | goto kill_ACKs; | |
963 | } | |
964 | } | |
965 | ||
966 | /* handle resending */ | |
967 | if (test_and_clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events)) | |
968 | rxrpc_resend_timer(call); | |
969 | if (test_and_clear_bit(RXRPC_CALL_RESEND, &call->events)) | |
970 | rxrpc_resend(call); | |
971 | ||
972 | /* consider sending an ordinary ACK */ | |
973 | if (test_bit(RXRPC_CALL_ACK, &call->events)) { | |
974 | __be32 pad; | |
975 | ||
976 | _debug("send ACK: window: %d - %d { %lx }", | |
977 | call->rx_data_eaten, call->ackr_win_top, | |
978 | call->ackr_window[0]); | |
979 | ||
980 | if (call->state > RXRPC_CALL_SERVER_ACK_REQUEST && | |
981 | call->ackr_reason != RXRPC_ACK_PING_RESPONSE) { | |
982 | /* ACK by sending reply DATA packet in this state */ | |
983 | clear_bit(RXRPC_CALL_ACK, &call->events); | |
984 | goto maybe_reschedule; | |
985 | } | |
986 | ||
987 | genbit = RXRPC_CALL_ACK; | |
988 | ||
989 | acks = kzalloc(call->ackr_win_top - call->rx_data_eaten, | |
990 | GFP_NOFS); | |
991 | if (!acks) | |
992 | goto no_mem; | |
993 | ||
994 | //hdr.flags = RXRPC_SLOW_START_OK; | |
995 | ack.bufferSpace = htons(8); | |
996 | ack.maxSkew = 0; | |
997 | ack.serial = 0; | |
998 | ack.reason = 0; | |
999 | ||
1000 | ackinfo.rxMTU = htonl(5692); | |
1001 | // ackinfo.rxMTU = htonl(call->conn->trans->peer->maxdata); | |
1002 | ackinfo.maxMTU = htonl(call->conn->trans->peer->maxdata); | |
1003 | ackinfo.rwind = htonl(32); | |
1004 | ackinfo.jumbo_max = htonl(4); | |
1005 | ||
1006 | spin_lock_bh(&call->lock); | |
1007 | ack.reason = call->ackr_reason; | |
1008 | ack.serial = call->ackr_serial; | |
1009 | ack.previousPacket = call->ackr_prev_seq; | |
1010 | ack.firstPacket = htonl(call->rx_data_eaten + 1); | |
1011 | ||
1012 | ack.nAcks = 0; | |
1013 | for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) { | |
1014 | nbit = loop * BITS_PER_LONG; | |
1015 | for (bits = call->ackr_window[loop]; bits; bits >>= 1 | |
1016 | ) { | |
1017 | _debug("- l=%d n=%d b=%lx", loop, nbit, bits); | |
1018 | if (bits & 1) { | |
1019 | acks[nbit] = RXRPC_ACK_TYPE_ACK; | |
1020 | ack.nAcks = nbit + 1; | |
1021 | } | |
1022 | nbit++; | |
1023 | } | |
1024 | } | |
1025 | call->ackr_reason = 0; | |
1026 | spin_unlock_bh(&call->lock); | |
1027 | ||
1028 | pad = 0; | |
1029 | ||
1030 | iov[1].iov_base = &ack; | |
1031 | iov[1].iov_len = sizeof(ack); | |
1032 | iov[2].iov_base = acks; | |
1033 | iov[2].iov_len = ack.nAcks; | |
1034 | iov[3].iov_base = &pad; | |
1035 | iov[3].iov_len = 3; | |
1036 | iov[4].iov_base = &ackinfo; | |
1037 | iov[4].iov_len = sizeof(ackinfo); | |
1038 | ||
1039 | switch (ack.reason) { | |
1040 | case RXRPC_ACK_REQUESTED: | |
1041 | case RXRPC_ACK_DUPLICATE: | |
1042 | case RXRPC_ACK_OUT_OF_SEQUENCE: | |
1043 | case RXRPC_ACK_EXCEEDS_WINDOW: | |
1044 | case RXRPC_ACK_NOSPACE: | |
1045 | case RXRPC_ACK_PING: | |
1046 | case RXRPC_ACK_PING_RESPONSE: | |
1047 | goto send_ACK_with_skew; | |
1048 | case RXRPC_ACK_DELAY: | |
1049 | case RXRPC_ACK_IDLE: | |
1050 | goto send_ACK; | |
1051 | } | |
1052 | } | |
1053 | ||
1054 | /* handle completion of security negotiations on an incoming | |
1055 | * connection */ | |
1056 | if (test_and_clear_bit(RXRPC_CALL_SECURED, &call->events)) { | |
1057 | _debug("secured"); | |
1058 | spin_lock_bh(&call->lock); | |
1059 | ||
1060 | if (call->state == RXRPC_CALL_SERVER_SECURING) { | |
1061 | _debug("securing"); | |
1062 | write_lock(&call->conn->lock); | |
1063 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
1064 | !test_bit(RXRPC_CALL_RELEASE, &call->events)) { | |
1065 | _debug("not released"); | |
1066 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
1067 | list_move_tail(&call->accept_link, | |
1068 | &call->socket->acceptq); | |
1069 | } | |
1070 | write_unlock(&call->conn->lock); | |
1071 | read_lock(&call->state_lock); | |
1072 | if (call->state < RXRPC_CALL_COMPLETE) | |
1073 | set_bit(RXRPC_CALL_POST_ACCEPT, &call->events); | |
1074 | read_unlock(&call->state_lock); | |
1075 | } | |
1076 | ||
1077 | spin_unlock_bh(&call->lock); | |
1078 | if (!test_bit(RXRPC_CALL_POST_ACCEPT, &call->events)) | |
1079 | goto maybe_reschedule; | |
1080 | } | |
1081 | ||
1082 | /* post a notification of an acceptable connection to the app */ | |
1083 | if (test_bit(RXRPC_CALL_POST_ACCEPT, &call->events)) { | |
1084 | _debug("post accept"); | |
1085 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NEW_CALL, | |
1086 | 0, false) < 0) | |
1087 | goto no_mem; | |
1088 | clear_bit(RXRPC_CALL_POST_ACCEPT, &call->events); | |
1089 | goto maybe_reschedule; | |
1090 | } | |
1091 | ||
1092 | /* handle incoming call acceptance */ | |
1093 | if (test_and_clear_bit(RXRPC_CALL_ACCEPTED, &call->events)) { | |
1094 | _debug("accepted"); | |
1095 | ASSERTCMP(call->rx_data_post, ==, 0); | |
1096 | call->rx_data_post = 1; | |
1097 | read_lock_bh(&call->state_lock); | |
1098 | if (call->state < RXRPC_CALL_COMPLETE) | |
1099 | set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events); | |
1100 | read_unlock_bh(&call->state_lock); | |
1101 | } | |
1102 | ||
1103 | /* drain the out of sequence received packet queue into the packet Rx | |
1104 | * queue */ | |
1105 | if (test_and_clear_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events)) { | |
1106 | while (call->rx_data_post == call->rx_first_oos) | |
1107 | if (rxrpc_drain_rx_oos_queue(call) < 0) | |
1108 | break; | |
1109 | goto maybe_reschedule; | |
1110 | } | |
1111 | ||
1112 | /* other events may have been raised since we started checking */ | |
1113 | goto maybe_reschedule; | |
1114 | ||
1115 | send_ACK_with_skew: | |
1116 | ack.maxSkew = htons(atomic_read(&call->conn->hi_serial) - | |
1117 | ntohl(ack.serial)); | |
1118 | send_ACK: | |
1119 | hdr.serial = htonl(atomic_inc_return(&call->conn->serial)); | |
1120 | _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", | |
1121 | ntohl(hdr.serial), | |
1122 | ntohs(ack.maxSkew), | |
1123 | ntohl(ack.firstPacket), | |
1124 | ntohl(ack.previousPacket), | |
1125 | ntohl(ack.serial), | |
1126 | rxrpc_acks[ack.reason], | |
1127 | ack.nAcks); | |
1128 | ||
1129 | del_timer_sync(&call->ack_timer); | |
1130 | if (ack.nAcks > 0) | |
1131 | set_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags); | |
1132 | goto send_message_2; | |
1133 | ||
1134 | send_message: | |
1135 | _debug("send message"); | |
1136 | ||
1137 | hdr.serial = htonl(atomic_inc_return(&call->conn->serial)); | |
1138 | _proto("Tx %s %%%u", rxrpc_pkts[hdr.type], ntohl(hdr.serial)); | |
1139 | send_message_2: | |
1140 | ||
1141 | len = iov[0].iov_len; | |
1142 | ioc = 1; | |
1143 | if (iov[4].iov_len) { | |
1144 | ioc = 5; | |
1145 | len += iov[4].iov_len; | |
1146 | len += iov[3].iov_len; | |
1147 | len += iov[2].iov_len; | |
1148 | len += iov[1].iov_len; | |
1149 | } else if (iov[3].iov_len) { | |
1150 | ioc = 4; | |
1151 | len += iov[3].iov_len; | |
1152 | len += iov[2].iov_len; | |
1153 | len += iov[1].iov_len; | |
1154 | } else if (iov[2].iov_len) { | |
1155 | ioc = 3; | |
1156 | len += iov[2].iov_len; | |
1157 | len += iov[1].iov_len; | |
1158 | } else if (iov[1].iov_len) { | |
1159 | ioc = 2; | |
1160 | len += iov[1].iov_len; | |
1161 | } | |
1162 | ||
1163 | ret = kernel_sendmsg(call->conn->trans->local->socket, | |
1164 | &msg, iov, ioc, len); | |
1165 | if (ret < 0) { | |
1166 | _debug("sendmsg failed: %d", ret); | |
1167 | read_lock_bh(&call->state_lock); | |
1168 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1169 | rxrpc_queue_call(call); |
17926a79 DH |
1170 | read_unlock_bh(&call->state_lock); |
1171 | goto error; | |
1172 | } | |
1173 | ||
1174 | switch (genbit) { | |
1175 | case RXRPC_CALL_ABORT: | |
1176 | clear_bit(genbit, &call->events); | |
1177 | clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events); | |
1178 | goto kill_ACKs; | |
1179 | ||
1180 | case RXRPC_CALL_ACK_FINAL: | |
1181 | write_lock_bh(&call->state_lock); | |
1182 | if (call->state == RXRPC_CALL_CLIENT_FINAL_ACK) | |
1183 | call->state = RXRPC_CALL_COMPLETE; | |
1184 | write_unlock_bh(&call->state_lock); | |
1185 | goto kill_ACKs; | |
1186 | ||
1187 | default: | |
1188 | clear_bit(genbit, &call->events); | |
1189 | switch (call->state) { | |
1190 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
1191 | case RXRPC_CALL_CLIENT_RECV_REPLY: | |
1192 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
1193 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
1194 | _debug("start ACK timer"); | |
1195 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, | |
1196 | call->ackr_serial, false); | |
1197 | default: | |
1198 | break; | |
1199 | } | |
1200 | goto maybe_reschedule; | |
1201 | } | |
1202 | ||
1203 | kill_ACKs: | |
1204 | del_timer_sync(&call->ack_timer); | |
1205 | if (test_and_clear_bit(RXRPC_CALL_ACK_FINAL, &call->events)) | |
1206 | rxrpc_put_call(call); | |
1207 | clear_bit(RXRPC_CALL_ACK, &call->events); | |
1208 | ||
1209 | maybe_reschedule: | |
1210 | if (call->events || !skb_queue_empty(&call->rx_queue)) { | |
1211 | read_lock_bh(&call->state_lock); | |
1212 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1213 | rxrpc_queue_call(call); |
17926a79 DH |
1214 | read_unlock_bh(&call->state_lock); |
1215 | } | |
1216 | ||
1217 | /* don't leave aborted connections on the accept queue */ | |
1218 | if (call->state >= RXRPC_CALL_COMPLETE && | |
1219 | !list_empty(&call->accept_link)) { | |
1220 | _debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }", | |
1221 | call, call->events, call->flags, | |
1222 | ntohl(call->conn->cid)); | |
1223 | ||
1224 | read_lock_bh(&call->state_lock); | |
1225 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
1226 | !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) | |
651350d1 | 1227 | rxrpc_queue_call(call); |
17926a79 DH |
1228 | read_unlock_bh(&call->state_lock); |
1229 | } | |
1230 | ||
1231 | error: | |
1232 | clear_bit(RXRPC_CALL_PROC_BUSY, &call->flags); | |
1233 | kfree(acks); | |
1234 | ||
1235 | /* because we don't want two CPUs both processing the work item for one | |
1236 | * call at the same time, we use a flag to note when it's busy; however | |
1237 | * this means there's a race between clearing the flag and setting the | |
1238 | * work pending bit and the work item being processed again */ | |
1239 | if (call->events && !work_pending(&call->processor)) { | |
1240 | _debug("jumpstart %x", ntohl(call->conn->cid)); | |
651350d1 | 1241 | rxrpc_queue_call(call); |
17926a79 DH |
1242 | } |
1243 | ||
1244 | _leave(""); | |
1245 | return; | |
1246 | ||
1247 | no_mem: | |
1248 | _debug("out of memory"); | |
1249 | goto maybe_reschedule; | |
1250 | } |