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> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
17926a79 DH |
17 | #include <linux/udp.h> |
18 | #include <net/sock.h> | |
19 | #include <net/af_rxrpc.h> | |
20 | #include "ar-internal.h" | |
21 | ||
5873c083 DH |
22 | /* |
23 | * How long to wait before scheduling ACK generation after seeing a | |
24 | * packet with RXRPC_REQUEST_ACK set (in jiffies). | |
25 | */ | |
26 | unsigned rxrpc_requested_ack_delay = 1; | |
27 | ||
28 | /* | |
29 | * How long to wait before scheduling an ACK with subtype DELAY (in jiffies). | |
30 | * | |
31 | * We use this when we've received new data packets. If those packets aren't | |
32 | * all consumed within this time we will send a DELAY ACK if an ACK was not | |
33 | * requested to let the sender know it doesn't need to resend. | |
34 | */ | |
35 | unsigned rxrpc_soft_ack_delay = 1 * HZ; | |
36 | ||
37 | /* | |
38 | * How long to wait before scheduling an ACK with subtype IDLE (in jiffies). | |
39 | * | |
40 | * We use this when we've consumed some previously soft-ACK'd packets when | |
41 | * further packets aren't immediately received to decide when to send an IDLE | |
42 | * ACK let the other end know that it can free up its Tx buffer space. | |
43 | */ | |
9823f39a | 44 | unsigned rxrpc_idle_ack_delay = 0.5 * HZ; |
17926a79 | 45 | |
08d4d217 DC |
46 | static const char *rxrpc_acks(u8 reason) |
47 | { | |
48 | static const char *const str[] = { | |
49 | "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY", | |
50 | "IDL", "-?-" | |
51 | }; | |
52 | ||
53 | if (reason >= ARRAY_SIZE(str)) | |
54 | reason = ARRAY_SIZE(str) - 1; | |
55 | return str[reason]; | |
56 | } | |
17926a79 DH |
57 | |
58 | static const s8 rxrpc_ack_priority[] = { | |
59 | [0] = 0, | |
60 | [RXRPC_ACK_DELAY] = 1, | |
61 | [RXRPC_ACK_REQUESTED] = 2, | |
62 | [RXRPC_ACK_IDLE] = 3, | |
63 | [RXRPC_ACK_PING_RESPONSE] = 4, | |
64 | [RXRPC_ACK_DUPLICATE] = 5, | |
65 | [RXRPC_ACK_OUT_OF_SEQUENCE] = 6, | |
66 | [RXRPC_ACK_EXCEEDS_WINDOW] = 7, | |
67 | [RXRPC_ACK_NOSPACE] = 8, | |
68 | }; | |
69 | ||
70 | /* | |
71 | * propose an ACK be sent | |
72 | */ | |
4e36a95e | 73 | void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
17926a79 DH |
74 | __be32 serial, bool immediate) |
75 | { | |
76 | unsigned long expiry; | |
77 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
78 | ||
79 | ASSERTCMP(prior, >, 0); | |
80 | ||
81 | _enter("{%d},%s,%%%x,%u", | |
08d4d217 | 82 | call->debug_id, rxrpc_acks(ack_reason), ntohl(serial), |
17926a79 DH |
83 | immediate); |
84 | ||
85 | if (prior < rxrpc_ack_priority[call->ackr_reason]) { | |
86 | if (immediate) | |
87 | goto cancel_timer; | |
88 | return; | |
89 | } | |
90 | ||
91 | /* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial | |
92 | * numbers */ | |
93 | if (prior == rxrpc_ack_priority[call->ackr_reason]) { | |
94 | if (prior <= 4) | |
95 | call->ackr_serial = serial; | |
96 | if (immediate) | |
97 | goto cancel_timer; | |
98 | return; | |
99 | } | |
100 | ||
101 | call->ackr_reason = ack_reason; | |
102 | call->ackr_serial = serial; | |
103 | ||
104 | switch (ack_reason) { | |
105 | case RXRPC_ACK_DELAY: | |
106 | _debug("run delay timer"); | |
5873c083 DH |
107 | expiry = rxrpc_soft_ack_delay; |
108 | goto run_timer; | |
17926a79 DH |
109 | |
110 | case RXRPC_ACK_IDLE: | |
111 | if (!immediate) { | |
112 | _debug("run defer timer"); | |
5873c083 | 113 | expiry = rxrpc_idle_ack_delay; |
17926a79 DH |
114 | goto run_timer; |
115 | } | |
116 | goto cancel_timer; | |
117 | ||
118 | case RXRPC_ACK_REQUESTED: | |
5873c083 DH |
119 | expiry = rxrpc_requested_ack_delay; |
120 | if (!expiry) | |
17926a79 DH |
121 | goto cancel_timer; |
122 | if (!immediate || serial == cpu_to_be32(1)) { | |
123 | _debug("run defer timer"); | |
17926a79 DH |
124 | goto run_timer; |
125 | } | |
126 | ||
127 | default: | |
128 | _debug("immediate ACK"); | |
129 | goto cancel_timer; | |
130 | } | |
131 | ||
132 | run_timer: | |
133 | expiry += jiffies; | |
134 | if (!timer_pending(&call->ack_timer) || | |
135 | time_after(call->ack_timer.expires, expiry)) | |
136 | mod_timer(&call->ack_timer, expiry); | |
137 | return; | |
138 | ||
139 | cancel_timer: | |
140 | _debug("cancel timer %%%u", ntohl(serial)); | |
141 | try_to_del_timer_sync(&call->ack_timer); | |
142 | read_lock_bh(&call->state_lock); | |
143 | if (call->state <= RXRPC_CALL_COMPLETE && | |
144 | !test_and_set_bit(RXRPC_CALL_ACK, &call->events)) | |
651350d1 | 145 | rxrpc_queue_call(call); |
17926a79 DH |
146 | read_unlock_bh(&call->state_lock); |
147 | } | |
148 | ||
149 | /* | |
150 | * propose an ACK be sent, locking the call structure | |
151 | */ | |
4e36a95e | 152 | void rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
17926a79 DH |
153 | __be32 serial, bool immediate) |
154 | { | |
155 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
156 | ||
157 | if (prior > rxrpc_ack_priority[call->ackr_reason]) { | |
158 | spin_lock_bh(&call->lock); | |
159 | __rxrpc_propose_ACK(call, ack_reason, serial, immediate); | |
160 | spin_unlock_bh(&call->lock); | |
161 | } | |
162 | } | |
163 | ||
164 | /* | |
165 | * set the resend timer | |
166 | */ | |
167 | static void rxrpc_set_resend(struct rxrpc_call *call, u8 resend, | |
168 | unsigned long resend_at) | |
169 | { | |
170 | read_lock_bh(&call->state_lock); | |
171 | if (call->state >= RXRPC_CALL_COMPLETE) | |
172 | resend = 0; | |
173 | ||
174 | if (resend & 1) { | |
175 | _debug("SET RESEND"); | |
176 | set_bit(RXRPC_CALL_RESEND, &call->events); | |
177 | } | |
178 | ||
179 | if (resend & 2) { | |
180 | _debug("MODIFY RESEND TIMER"); | |
181 | set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
182 | mod_timer(&call->resend_timer, resend_at); | |
183 | } else { | |
184 | _debug("KILL RESEND TIMER"); | |
185 | del_timer_sync(&call->resend_timer); | |
186 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); | |
187 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
188 | } | |
189 | read_unlock_bh(&call->state_lock); | |
190 | } | |
191 | ||
192 | /* | |
193 | * resend packets | |
194 | */ | |
195 | static void rxrpc_resend(struct rxrpc_call *call) | |
196 | { | |
197 | struct rxrpc_skb_priv *sp; | |
198 | struct rxrpc_header *hdr; | |
199 | struct sk_buff *txb; | |
200 | unsigned long *p_txb, resend_at; | |
201 | int loop, stop; | |
202 | u8 resend; | |
203 | ||
204 | _enter("{%d,%d,%d,%d},", | |
205 | call->acks_hard, call->acks_unacked, | |
206 | atomic_read(&call->sequence), | |
207 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
208 | ||
209 | stop = 0; | |
210 | resend = 0; | |
211 | resend_at = 0; | |
212 | ||
213 | for (loop = call->acks_tail; | |
214 | loop != call->acks_head || stop; | |
215 | loop = (loop + 1) & (call->acks_winsz - 1) | |
216 | ) { | |
217 | p_txb = call->acks_window + loop; | |
218 | smp_read_barrier_depends(); | |
219 | if (*p_txb & 1) | |
220 | continue; | |
221 | ||
222 | txb = (struct sk_buff *) *p_txb; | |
223 | sp = rxrpc_skb(txb); | |
224 | ||
225 | if (sp->need_resend) { | |
3db1cd5c | 226 | sp->need_resend = false; |
17926a79 DH |
227 | |
228 | /* each Tx packet has a new serial number */ | |
229 | sp->hdr.serial = | |
230 | htonl(atomic_inc_return(&call->conn->serial)); | |
231 | ||
232 | hdr = (struct rxrpc_header *) txb->head; | |
233 | hdr->serial = sp->hdr.serial; | |
234 | ||
235 | _proto("Tx DATA %%%u { #%d }", | |
236 | ntohl(sp->hdr.serial), ntohl(sp->hdr.seq)); | |
237 | if (rxrpc_send_packet(call->conn->trans, txb) < 0) { | |
238 | stop = 0; | |
239 | sp->resend_at = jiffies + 3; | |
240 | } else { | |
241 | sp->resend_at = | |
242 | jiffies + rxrpc_resend_timeout * HZ; | |
243 | } | |
244 | } | |
245 | ||
246 | if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 247 | sp->need_resend = true; |
17926a79 DH |
248 | resend |= 1; |
249 | } else if (resend & 2) { | |
250 | if (time_before(sp->resend_at, resend_at)) | |
251 | resend_at = sp->resend_at; | |
252 | } else { | |
253 | resend_at = sp->resend_at; | |
254 | resend |= 2; | |
255 | } | |
256 | } | |
257 | ||
258 | rxrpc_set_resend(call, resend, resend_at); | |
259 | _leave(""); | |
260 | } | |
261 | ||
262 | /* | |
263 | * handle resend timer expiry | |
264 | */ | |
265 | static void rxrpc_resend_timer(struct rxrpc_call *call) | |
266 | { | |
267 | struct rxrpc_skb_priv *sp; | |
268 | struct sk_buff *txb; | |
269 | unsigned long *p_txb, resend_at; | |
270 | int loop; | |
271 | u8 resend; | |
272 | ||
273 | _enter("%d,%d,%d", | |
274 | call->acks_tail, call->acks_unacked, call->acks_head); | |
275 | ||
3b5bac2b DH |
276 | if (call->state >= RXRPC_CALL_COMPLETE) |
277 | return; | |
278 | ||
17926a79 DH |
279 | resend = 0; |
280 | resend_at = 0; | |
281 | ||
282 | for (loop = call->acks_unacked; | |
283 | loop != call->acks_head; | |
284 | loop = (loop + 1) & (call->acks_winsz - 1) | |
285 | ) { | |
286 | p_txb = call->acks_window + loop; | |
287 | smp_read_barrier_depends(); | |
288 | txb = (struct sk_buff *) (*p_txb & ~1); | |
289 | sp = rxrpc_skb(txb); | |
290 | ||
291 | ASSERT(!(*p_txb & 1)); | |
292 | ||
293 | if (sp->need_resend) { | |
294 | ; | |
295 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 296 | sp->need_resend = true; |
17926a79 DH |
297 | resend |= 1; |
298 | } else if (resend & 2) { | |
299 | if (time_before(sp->resend_at, resend_at)) | |
300 | resend_at = sp->resend_at; | |
301 | } else { | |
302 | resend_at = sp->resend_at; | |
303 | resend |= 2; | |
304 | } | |
305 | } | |
306 | ||
307 | rxrpc_set_resend(call, resend, resend_at); | |
308 | _leave(""); | |
309 | } | |
310 | ||
311 | /* | |
312 | * process soft ACKs of our transmitted packets | |
313 | * - these indicate packets the peer has or has not received, but hasn't yet | |
314 | * given to the consumer, and so can still be discarded and re-requested | |
315 | */ | |
316 | static int rxrpc_process_soft_ACKs(struct rxrpc_call *call, | |
317 | struct rxrpc_ackpacket *ack, | |
318 | struct sk_buff *skb) | |
319 | { | |
320 | struct rxrpc_skb_priv *sp; | |
321 | struct sk_buff *txb; | |
322 | unsigned long *p_txb, resend_at; | |
323 | int loop; | |
324 | u8 sacks[RXRPC_MAXACKS], resend; | |
325 | ||
326 | _enter("{%d,%d},{%d},", | |
327 | call->acks_hard, | |
328 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz), | |
329 | ack->nAcks); | |
330 | ||
331 | if (skb_copy_bits(skb, 0, sacks, ack->nAcks) < 0) | |
332 | goto protocol_error; | |
333 | ||
334 | resend = 0; | |
335 | resend_at = 0; | |
336 | for (loop = 0; loop < ack->nAcks; loop++) { | |
337 | p_txb = call->acks_window; | |
338 | p_txb += (call->acks_tail + loop) & (call->acks_winsz - 1); | |
339 | smp_read_barrier_depends(); | |
340 | txb = (struct sk_buff *) (*p_txb & ~1); | |
341 | sp = rxrpc_skb(txb); | |
342 | ||
343 | switch (sacks[loop]) { | |
344 | case RXRPC_ACK_TYPE_ACK: | |
3db1cd5c | 345 | sp->need_resend = false; |
17926a79 DH |
346 | *p_txb |= 1; |
347 | break; | |
348 | case RXRPC_ACK_TYPE_NACK: | |
3db1cd5c | 349 | sp->need_resend = true; |
17926a79 DH |
350 | *p_txb &= ~1; |
351 | resend = 1; | |
352 | break; | |
353 | default: | |
354 | _debug("Unsupported ACK type %d", sacks[loop]); | |
355 | goto protocol_error; | |
356 | } | |
357 | } | |
358 | ||
359 | smp_mb(); | |
360 | call->acks_unacked = (call->acks_tail + loop) & (call->acks_winsz - 1); | |
361 | ||
362 | /* anything not explicitly ACK'd is implicitly NACK'd, but may just not | |
363 | * have been received or processed yet by the far end */ | |
364 | for (loop = call->acks_unacked; | |
365 | loop != call->acks_head; | |
366 | loop = (loop + 1) & (call->acks_winsz - 1) | |
367 | ) { | |
368 | p_txb = call->acks_window + loop; | |
369 | smp_read_barrier_depends(); | |
370 | txb = (struct sk_buff *) (*p_txb & ~1); | |
371 | sp = rxrpc_skb(txb); | |
372 | ||
373 | if (*p_txb & 1) { | |
374 | /* packet must have been discarded */ | |
3db1cd5c | 375 | sp->need_resend = true; |
17926a79 DH |
376 | *p_txb &= ~1; |
377 | resend |= 1; | |
378 | } else if (sp->need_resend) { | |
379 | ; | |
380 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 381 | sp->need_resend = true; |
17926a79 DH |
382 | resend |= 1; |
383 | } else if (resend & 2) { | |
384 | if (time_before(sp->resend_at, resend_at)) | |
385 | resend_at = sp->resend_at; | |
386 | } else { | |
387 | resend_at = sp->resend_at; | |
388 | resend |= 2; | |
389 | } | |
390 | } | |
391 | ||
392 | rxrpc_set_resend(call, resend, resend_at); | |
393 | _leave(" = 0"); | |
394 | return 0; | |
395 | ||
396 | protocol_error: | |
397 | _leave(" = -EPROTO"); | |
398 | return -EPROTO; | |
399 | } | |
400 | ||
401 | /* | |
402 | * discard hard-ACK'd packets from the Tx window | |
403 | */ | |
404 | static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard) | |
405 | { | |
17926a79 DH |
406 | unsigned long _skb; |
407 | int tail = call->acks_tail, old_tail; | |
408 | int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz); | |
409 | ||
410 | _enter("{%u,%u},%u", call->acks_hard, win, hard); | |
411 | ||
412 | ASSERTCMP(hard - call->acks_hard, <=, win); | |
413 | ||
414 | while (call->acks_hard < hard) { | |
415 | smp_read_barrier_depends(); | |
416 | _skb = call->acks_window[tail] & ~1; | |
17926a79 DH |
417 | rxrpc_free_skb((struct sk_buff *) _skb); |
418 | old_tail = tail; | |
419 | tail = (tail + 1) & (call->acks_winsz - 1); | |
420 | call->acks_tail = tail; | |
421 | if (call->acks_unacked == old_tail) | |
422 | call->acks_unacked = tail; | |
423 | call->acks_hard++; | |
424 | } | |
425 | ||
426 | wake_up(&call->tx_waitq); | |
427 | } | |
428 | ||
429 | /* | |
430 | * clear the Tx window in the event of a failure | |
431 | */ | |
432 | static void rxrpc_clear_tx_window(struct rxrpc_call *call) | |
433 | { | |
434 | rxrpc_rotate_tx_window(call, atomic_read(&call->sequence)); | |
435 | } | |
436 | ||
437 | /* | |
438 | * drain the out of sequence received packet queue into the packet Rx queue | |
439 | */ | |
440 | static int rxrpc_drain_rx_oos_queue(struct rxrpc_call *call) | |
441 | { | |
442 | struct rxrpc_skb_priv *sp; | |
443 | struct sk_buff *skb; | |
444 | bool terminal; | |
445 | int ret; | |
446 | ||
447 | _enter("{%d,%d}", call->rx_data_post, call->rx_first_oos); | |
448 | ||
449 | spin_lock_bh(&call->lock); | |
450 | ||
451 | ret = -ECONNRESET; | |
452 | if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
453 | goto socket_unavailable; | |
454 | ||
455 | skb = skb_dequeue(&call->rx_oos_queue); | |
456 | if (skb) { | |
457 | sp = rxrpc_skb(skb); | |
458 | ||
459 | _debug("drain OOS packet %d [%d]", | |
460 | ntohl(sp->hdr.seq), call->rx_first_oos); | |
461 | ||
462 | if (ntohl(sp->hdr.seq) != call->rx_first_oos) { | |
463 | skb_queue_head(&call->rx_oos_queue, skb); | |
464 | call->rx_first_oos = ntohl(rxrpc_skb(skb)->hdr.seq); | |
465 | _debug("requeue %p {%u}", skb, call->rx_first_oos); | |
466 | } else { | |
467 | skb->mark = RXRPC_SKB_MARK_DATA; | |
468 | terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && | |
469 | !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); | |
470 | ret = rxrpc_queue_rcv_skb(call, skb, true, terminal); | |
471 | BUG_ON(ret < 0); | |
472 | _debug("drain #%u", call->rx_data_post); | |
473 | call->rx_data_post++; | |
474 | ||
475 | /* find out what the next packet is */ | |
476 | skb = skb_peek(&call->rx_oos_queue); | |
477 | if (skb) | |
478 | call->rx_first_oos = | |
479 | ntohl(rxrpc_skb(skb)->hdr.seq); | |
480 | else | |
481 | call->rx_first_oos = 0; | |
482 | _debug("peek %p {%u}", skb, call->rx_first_oos); | |
483 | } | |
484 | } | |
485 | ||
486 | ret = 0; | |
487 | socket_unavailable: | |
488 | spin_unlock_bh(&call->lock); | |
489 | _leave(" = %d", ret); | |
490 | return ret; | |
491 | } | |
492 | ||
493 | /* | |
494 | * insert an out of sequence packet into the buffer | |
495 | */ | |
496 | static void rxrpc_insert_oos_packet(struct rxrpc_call *call, | |
497 | struct sk_buff *skb) | |
498 | { | |
499 | struct rxrpc_skb_priv *sp, *psp; | |
500 | struct sk_buff *p; | |
501 | u32 seq; | |
502 | ||
503 | sp = rxrpc_skb(skb); | |
504 | seq = ntohl(sp->hdr.seq); | |
505 | _enter(",,{%u}", seq); | |
506 | ||
507 | skb->destructor = rxrpc_packet_destructor; | |
508 | ASSERTCMP(sp->call, ==, NULL); | |
509 | sp->call = call; | |
510 | rxrpc_get_call(call); | |
511 | ||
512 | /* insert into the buffer in sequence order */ | |
513 | spin_lock_bh(&call->lock); | |
514 | ||
515 | skb_queue_walk(&call->rx_oos_queue, p) { | |
516 | psp = rxrpc_skb(p); | |
517 | if (ntohl(psp->hdr.seq) > seq) { | |
518 | _debug("insert oos #%u before #%u", | |
519 | seq, ntohl(psp->hdr.seq)); | |
520 | skb_insert(p, skb, &call->rx_oos_queue); | |
521 | goto inserted; | |
522 | } | |
523 | } | |
524 | ||
525 | _debug("append oos #%u", seq); | |
526 | skb_queue_tail(&call->rx_oos_queue, skb); | |
527 | inserted: | |
528 | ||
529 | /* we might now have a new front to the queue */ | |
530 | if (call->rx_first_oos == 0 || seq < call->rx_first_oos) | |
531 | call->rx_first_oos = seq; | |
532 | ||
533 | read_lock(&call->state_lock); | |
534 | if (call->state < RXRPC_CALL_COMPLETE && | |
535 | call->rx_data_post == call->rx_first_oos) { | |
536 | _debug("drain rx oos now"); | |
537 | set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events); | |
538 | } | |
539 | read_unlock(&call->state_lock); | |
540 | ||
541 | spin_unlock_bh(&call->lock); | |
542 | _leave(" [stored #%u]", call->rx_first_oos); | |
543 | } | |
544 | ||
545 | /* | |
546 | * clear the Tx window on final ACK reception | |
547 | */ | |
548 | static void rxrpc_zap_tx_window(struct rxrpc_call *call) | |
549 | { | |
550 | struct rxrpc_skb_priv *sp; | |
551 | struct sk_buff *skb; | |
552 | unsigned long _skb, *acks_window; | |
4e36a95e | 553 | u8 winsz = call->acks_winsz; |
17926a79 DH |
554 | int tail; |
555 | ||
556 | acks_window = call->acks_window; | |
557 | call->acks_window = NULL; | |
558 | ||
559 | while (CIRC_CNT(call->acks_head, call->acks_tail, winsz) > 0) { | |
560 | tail = call->acks_tail; | |
561 | smp_read_barrier_depends(); | |
562 | _skb = acks_window[tail] & ~1; | |
563 | smp_mb(); | |
564 | call->acks_tail = (call->acks_tail + 1) & (winsz - 1); | |
565 | ||
566 | skb = (struct sk_buff *) _skb; | |
567 | sp = rxrpc_skb(skb); | |
568 | _debug("+++ clear Tx %u", ntohl(sp->hdr.seq)); | |
569 | rxrpc_free_skb(skb); | |
570 | } | |
571 | ||
572 | kfree(acks_window); | |
573 | } | |
574 | ||
224711df DH |
575 | /* |
576 | * process the extra information that may be appended to an ACK packet | |
577 | */ | |
578 | static void rxrpc_extract_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, | |
95c96174 | 579 | unsigned int latest, int nAcks) |
224711df DH |
580 | { |
581 | struct rxrpc_ackinfo ackinfo; | |
582 | struct rxrpc_peer *peer; | |
95c96174 | 583 | unsigned int mtu; |
224711df DH |
584 | |
585 | if (skb_copy_bits(skb, nAcks + 3, &ackinfo, sizeof(ackinfo)) < 0) { | |
586 | _leave(" [no ackinfo]"); | |
587 | return; | |
588 | } | |
589 | ||
590 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
591 | latest, | |
592 | ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU), | |
593 | ntohl(ackinfo.rwind), ntohl(ackinfo.jumbo_max)); | |
594 | ||
595 | mtu = min(ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU)); | |
596 | ||
597 | peer = call->conn->trans->peer; | |
598 | if (mtu < peer->maxdata) { | |
599 | spin_lock_bh(&peer->lock); | |
600 | peer->maxdata = mtu; | |
601 | peer->mtu = mtu + peer->hdrsize; | |
602 | spin_unlock_bh(&peer->lock); | |
603 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
604 | } | |
605 | } | |
606 | ||
17926a79 DH |
607 | /* |
608 | * process packets in the reception queue | |
609 | */ | |
610 | static int rxrpc_process_rx_queue(struct rxrpc_call *call, | |
611 | u32 *_abort_code) | |
612 | { | |
613 | struct rxrpc_ackpacket ack; | |
614 | struct rxrpc_skb_priv *sp; | |
615 | struct sk_buff *skb; | |
616 | bool post_ACK; | |
617 | int latest; | |
618 | u32 hard, tx; | |
619 | ||
620 | _enter(""); | |
621 | ||
622 | process_further: | |
623 | skb = skb_dequeue(&call->rx_queue); | |
624 | if (!skb) | |
625 | return -EAGAIN; | |
626 | ||
627 | _net("deferred skb %p", skb); | |
628 | ||
629 | sp = rxrpc_skb(skb); | |
630 | ||
631 | _debug("process %s [st %d]", rxrpc_pkts[sp->hdr.type], call->state); | |
632 | ||
633 | post_ACK = false; | |
634 | ||
635 | switch (sp->hdr.type) { | |
636 | /* data packets that wind up here have been received out of | |
637 | * order, need security processing or are jumbo packets */ | |
638 | case RXRPC_PACKET_TYPE_DATA: | |
639 | _proto("OOSQ DATA %%%u { #%u }", | |
640 | ntohl(sp->hdr.serial), ntohl(sp->hdr.seq)); | |
641 | ||
642 | /* secured packets must be verified and possibly decrypted */ | |
643 | if (rxrpc_verify_packet(call, skb, _abort_code) < 0) | |
644 | goto protocol_error; | |
645 | ||
646 | rxrpc_insert_oos_packet(call, skb); | |
647 | goto process_further; | |
648 | ||
649 | /* partial ACK to process */ | |
650 | case RXRPC_PACKET_TYPE_ACK: | |
651 | if (skb_copy_bits(skb, 0, &ack, sizeof(ack)) < 0) { | |
652 | _debug("extraction failure"); | |
653 | goto protocol_error; | |
654 | } | |
655 | if (!skb_pull(skb, sizeof(ack))) | |
656 | BUG(); | |
657 | ||
658 | latest = ntohl(sp->hdr.serial); | |
659 | hard = ntohl(ack.firstPacket); | |
660 | tx = atomic_read(&call->sequence); | |
661 | ||
662 | _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", | |
663 | latest, | |
664 | ntohs(ack.maxSkew), | |
665 | hard, | |
666 | ntohl(ack.previousPacket), | |
667 | ntohl(ack.serial), | |
08d4d217 | 668 | rxrpc_acks(ack.reason), |
17926a79 DH |
669 | ack.nAcks); |
670 | ||
224711df DH |
671 | rxrpc_extract_ackinfo(call, skb, latest, ack.nAcks); |
672 | ||
17926a79 DH |
673 | if (ack.reason == RXRPC_ACK_PING) { |
674 | _proto("Rx ACK %%%u PING Request", latest); | |
675 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, | |
676 | sp->hdr.serial, true); | |
677 | } | |
678 | ||
679 | /* discard any out-of-order or duplicate ACKs */ | |
680 | if (latest - call->acks_latest <= 0) { | |
681 | _debug("discard ACK %d <= %d", | |
682 | latest, call->acks_latest); | |
683 | goto discard; | |
684 | } | |
685 | call->acks_latest = latest; | |
686 | ||
687 | if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
688 | call->state != RXRPC_CALL_CLIENT_AWAIT_REPLY && | |
689 | call->state != RXRPC_CALL_SERVER_SEND_REPLY && | |
690 | call->state != RXRPC_CALL_SERVER_AWAIT_ACK) | |
691 | goto discard; | |
692 | ||
693 | _debug("Tx=%d H=%u S=%d", tx, call->acks_hard, call->state); | |
694 | ||
695 | if (hard > 0) { | |
696 | if (hard - 1 > tx) { | |
697 | _debug("hard-ACK'd packet %d not transmitted" | |
698 | " (%d top)", | |
699 | hard - 1, tx); | |
700 | goto protocol_error; | |
701 | } | |
702 | ||
703 | if ((call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY || | |
704 | call->state == RXRPC_CALL_SERVER_AWAIT_ACK) && | |
705 | hard > tx) | |
706 | goto all_acked; | |
707 | ||
708 | smp_rmb(); | |
709 | rxrpc_rotate_tx_window(call, hard - 1); | |
710 | } | |
711 | ||
712 | if (ack.nAcks > 0) { | |
713 | if (hard - 1 + ack.nAcks > tx) { | |
714 | _debug("soft-ACK'd packet %d+%d not" | |
715 | " transmitted (%d top)", | |
716 | hard - 1, ack.nAcks, tx); | |
717 | goto protocol_error; | |
718 | } | |
719 | ||
720 | if (rxrpc_process_soft_ACKs(call, &ack, skb) < 0) | |
721 | goto protocol_error; | |
722 | } | |
723 | goto discard; | |
724 | ||
725 | /* complete ACK to process */ | |
726 | case RXRPC_PACKET_TYPE_ACKALL: | |
727 | goto all_acked; | |
728 | ||
729 | /* abort and busy are handled elsewhere */ | |
730 | case RXRPC_PACKET_TYPE_BUSY: | |
731 | case RXRPC_PACKET_TYPE_ABORT: | |
732 | BUG(); | |
733 | ||
734 | /* connection level events - also handled elsewhere */ | |
735 | case RXRPC_PACKET_TYPE_CHALLENGE: | |
736 | case RXRPC_PACKET_TYPE_RESPONSE: | |
737 | case RXRPC_PACKET_TYPE_DEBUG: | |
738 | BUG(); | |
739 | } | |
740 | ||
741 | /* if we've had a hard ACK that covers all the packets we've sent, then | |
742 | * that ends that phase of the operation */ | |
743 | all_acked: | |
744 | write_lock_bh(&call->state_lock); | |
745 | _debug("ack all %d", call->state); | |
746 | ||
747 | switch (call->state) { | |
748 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
749 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
750 | break; | |
751 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
752 | _debug("srv complete"); | |
753 | call->state = RXRPC_CALL_COMPLETE; | |
754 | post_ACK = true; | |
755 | break; | |
756 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
757 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
758 | goto protocol_error_unlock; /* can't occur yet */ | |
759 | default: | |
760 | write_unlock_bh(&call->state_lock); | |
761 | goto discard; /* assume packet left over from earlier phase */ | |
762 | } | |
763 | ||
764 | write_unlock_bh(&call->state_lock); | |
765 | ||
766 | /* if all the packets we sent are hard-ACK'd, then we can discard | |
767 | * whatever we've got left */ | |
768 | _debug("clear Tx %d", | |
769 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
770 | ||
771 | del_timer_sync(&call->resend_timer); | |
772 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
773 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); | |
774 | ||
775 | if (call->acks_window) | |
776 | rxrpc_zap_tx_window(call); | |
777 | ||
778 | if (post_ACK) { | |
779 | /* post the final ACK message for userspace to pick up */ | |
780 | _debug("post ACK"); | |
781 | skb->mark = RXRPC_SKB_MARK_FINAL_ACK; | |
782 | sp->call = call; | |
783 | rxrpc_get_call(call); | |
784 | spin_lock_bh(&call->lock); | |
785 | if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0) | |
786 | BUG(); | |
787 | spin_unlock_bh(&call->lock); | |
788 | goto process_further; | |
789 | } | |
790 | ||
791 | discard: | |
792 | rxrpc_free_skb(skb); | |
793 | goto process_further; | |
794 | ||
795 | protocol_error_unlock: | |
796 | write_unlock_bh(&call->state_lock); | |
797 | protocol_error: | |
798 | rxrpc_free_skb(skb); | |
799 | _leave(" = -EPROTO"); | |
800 | return -EPROTO; | |
801 | } | |
802 | ||
803 | /* | |
804 | * post a message to the socket Rx queue for recvmsg() to pick up | |
805 | */ | |
806 | static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error, | |
807 | bool fatal) | |
808 | { | |
809 | struct rxrpc_skb_priv *sp; | |
810 | struct sk_buff *skb; | |
811 | int ret; | |
812 | ||
813 | _enter("{%d,%lx},%u,%u,%d", | |
814 | call->debug_id, call->flags, mark, error, fatal); | |
815 | ||
816 | /* remove timers and things for fatal messages */ | |
817 | if (fatal) { | |
818 | del_timer_sync(&call->resend_timer); | |
819 | del_timer_sync(&call->ack_timer); | |
820 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
821 | } | |
822 | ||
823 | if (mark != RXRPC_SKB_MARK_NEW_CALL && | |
824 | !test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
825 | _leave("[no userid]"); | |
826 | return 0; | |
827 | } | |
828 | ||
829 | if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { | |
830 | skb = alloc_skb(0, GFP_NOFS); | |
831 | if (!skb) | |
832 | return -ENOMEM; | |
833 | ||
834 | rxrpc_new_skb(skb); | |
835 | ||
836 | skb->mark = mark; | |
837 | ||
838 | sp = rxrpc_skb(skb); | |
839 | memset(sp, 0, sizeof(*sp)); | |
840 | sp->error = error; | |
841 | sp->call = call; | |
842 | rxrpc_get_call(call); | |
843 | ||
844 | spin_lock_bh(&call->lock); | |
845 | ret = rxrpc_queue_rcv_skb(call, skb, true, fatal); | |
846 | spin_unlock_bh(&call->lock); | |
163e3cb7 | 847 | BUG_ON(ret < 0); |
17926a79 DH |
848 | } |
849 | ||
850 | return 0; | |
851 | } | |
852 | ||
853 | /* | |
854 | * handle background processing of incoming call packets and ACK / abort | |
855 | * generation | |
856 | */ | |
857 | void rxrpc_process_call(struct work_struct *work) | |
858 | { | |
859 | struct rxrpc_call *call = | |
860 | container_of(work, struct rxrpc_call, processor); | |
861 | struct rxrpc_ackpacket ack; | |
862 | struct rxrpc_ackinfo ackinfo; | |
863 | struct rxrpc_header hdr; | |
864 | struct msghdr msg; | |
865 | struct kvec iov[5]; | |
866 | unsigned long bits; | |
224711df | 867 | __be32 data, pad; |
17926a79 | 868 | size_t len; |
224711df | 869 | int genbit, loop, nbit, ioc, ret, mtu; |
17926a79 DH |
870 | u32 abort_code = RX_PROTOCOL_ERROR; |
871 | u8 *acks = NULL; | |
872 | ||
873 | //printk("\n--------------------\n"); | |
874 | _enter("{%d,%s,%lx} [%lu]", | |
875 | call->debug_id, rxrpc_call_states[call->state], call->events, | |
876 | (jiffies - call->creation_jif) / (HZ / 10)); | |
877 | ||
878 | if (test_and_set_bit(RXRPC_CALL_PROC_BUSY, &call->flags)) { | |
879 | _debug("XXXXXXXXXXXXX RUNNING ON MULTIPLE CPUS XXXXXXXXXXXXX"); | |
880 | return; | |
881 | } | |
882 | ||
883 | /* there's a good chance we're going to have to send a message, so set | |
884 | * one up in advance */ | |
885 | msg.msg_name = &call->conn->trans->peer->srx.transport.sin; | |
886 | msg.msg_namelen = sizeof(call->conn->trans->peer->srx.transport.sin); | |
887 | msg.msg_control = NULL; | |
888 | msg.msg_controllen = 0; | |
889 | msg.msg_flags = 0; | |
890 | ||
891 | hdr.epoch = call->conn->epoch; | |
892 | hdr.cid = call->cid; | |
893 | hdr.callNumber = call->call_id; | |
894 | hdr.seq = 0; | |
895 | hdr.type = RXRPC_PACKET_TYPE_ACK; | |
896 | hdr.flags = call->conn->out_clientflag; | |
897 | hdr.userStatus = 0; | |
898 | hdr.securityIndex = call->conn->security_ix; | |
899 | hdr._rsvd = 0; | |
900 | hdr.serviceId = call->conn->service_id; | |
901 | ||
902 | memset(iov, 0, sizeof(iov)); | |
903 | iov[0].iov_base = &hdr; | |
904 | iov[0].iov_len = sizeof(hdr); | |
905 | ||
906 | /* deal with events of a final nature */ | |
907 | if (test_bit(RXRPC_CALL_RELEASE, &call->events)) { | |
908 | rxrpc_release_call(call); | |
909 | clear_bit(RXRPC_CALL_RELEASE, &call->events); | |
910 | } | |
911 | ||
912 | if (test_bit(RXRPC_CALL_RCVD_ERROR, &call->events)) { | |
913 | int error; | |
914 | ||
915 | clear_bit(RXRPC_CALL_CONN_ABORT, &call->events); | |
916 | clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events); | |
917 | clear_bit(RXRPC_CALL_ABORT, &call->events); | |
918 | ||
919 | error = call->conn->trans->peer->net_error; | |
920 | _debug("post net error %d", error); | |
921 | ||
922 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NET_ERROR, | |
923 | error, true) < 0) | |
924 | goto no_mem; | |
925 | clear_bit(RXRPC_CALL_RCVD_ERROR, &call->events); | |
926 | goto kill_ACKs; | |
927 | } | |
928 | ||
929 | if (test_bit(RXRPC_CALL_CONN_ABORT, &call->events)) { | |
930 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); | |
931 | ||
932 | clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events); | |
933 | clear_bit(RXRPC_CALL_ABORT, &call->events); | |
934 | ||
935 | _debug("post conn abort"); | |
936 | ||
937 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
938 | call->conn->error, true) < 0) | |
939 | goto no_mem; | |
940 | clear_bit(RXRPC_CALL_CONN_ABORT, &call->events); | |
941 | goto kill_ACKs; | |
942 | } | |
943 | ||
944 | if (test_bit(RXRPC_CALL_REJECT_BUSY, &call->events)) { | |
945 | hdr.type = RXRPC_PACKET_TYPE_BUSY; | |
946 | genbit = RXRPC_CALL_REJECT_BUSY; | |
947 | goto send_message; | |
948 | } | |
949 | ||
950 | if (test_bit(RXRPC_CALL_ABORT, &call->events)) { | |
951 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); | |
952 | ||
953 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
954 | ECONNABORTED, true) < 0) | |
955 | goto no_mem; | |
956 | hdr.type = RXRPC_PACKET_TYPE_ABORT; | |
957 | data = htonl(call->abort_code); | |
958 | iov[1].iov_base = &data; | |
959 | iov[1].iov_len = sizeof(data); | |
960 | genbit = RXRPC_CALL_ABORT; | |
961 | goto send_message; | |
962 | } | |
963 | ||
964 | if (test_bit(RXRPC_CALL_ACK_FINAL, &call->events)) { | |
17926a79 | 965 | genbit = RXRPC_CALL_ACK_FINAL; |
224711df DH |
966 | |
967 | ack.bufferSpace = htons(8); | |
968 | ack.maxSkew = 0; | |
969 | ack.serial = 0; | |
970 | ack.reason = RXRPC_ACK_IDLE; | |
971 | ack.nAcks = 0; | |
972 | call->ackr_reason = 0; | |
973 | ||
974 | spin_lock_bh(&call->lock); | |
975 | ack.serial = call->ackr_serial; | |
976 | ack.previousPacket = call->ackr_prev_seq; | |
977 | ack.firstPacket = htonl(call->rx_data_eaten + 1); | |
978 | spin_unlock_bh(&call->lock); | |
979 | ||
980 | pad = 0; | |
981 | ||
982 | iov[1].iov_base = &ack; | |
983 | iov[1].iov_len = sizeof(ack); | |
984 | iov[2].iov_base = &pad; | |
985 | iov[2].iov_len = 3; | |
986 | iov[3].iov_base = &ackinfo; | |
987 | iov[3].iov_len = sizeof(ackinfo); | |
988 | goto send_ACK; | |
17926a79 DH |
989 | } |
990 | ||
991 | if (call->events & ((1 << RXRPC_CALL_RCVD_BUSY) | | |
992 | (1 << RXRPC_CALL_RCVD_ABORT)) | |
993 | ) { | |
994 | u32 mark; | |
995 | ||
996 | if (test_bit(RXRPC_CALL_RCVD_ABORT, &call->events)) | |
997 | mark = RXRPC_SKB_MARK_REMOTE_ABORT; | |
998 | else | |
999 | mark = RXRPC_SKB_MARK_BUSY; | |
1000 | ||
1001 | _debug("post abort/busy"); | |
1002 | rxrpc_clear_tx_window(call); | |
1003 | if (rxrpc_post_message(call, mark, ECONNABORTED, true) < 0) | |
1004 | goto no_mem; | |
1005 | ||
1006 | clear_bit(RXRPC_CALL_RCVD_BUSY, &call->events); | |
1007 | clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events); | |
1008 | goto kill_ACKs; | |
1009 | } | |
1010 | ||
1011 | if (test_and_clear_bit(RXRPC_CALL_RCVD_ACKALL, &call->events)) { | |
1012 | _debug("do implicit ackall"); | |
1013 | rxrpc_clear_tx_window(call); | |
1014 | } | |
1015 | ||
1016 | if (test_bit(RXRPC_CALL_LIFE_TIMER, &call->events)) { | |
1017 | write_lock_bh(&call->state_lock); | |
1018 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
1019 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
1020 | call->abort_code = RX_CALL_TIMEOUT; | |
1021 | set_bit(RXRPC_CALL_ABORT, &call->events); | |
1022 | } | |
1023 | write_unlock_bh(&call->state_lock); | |
1024 | ||
1025 | _debug("post timeout"); | |
1026 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
1027 | ETIME, true) < 0) | |
1028 | goto no_mem; | |
1029 | ||
1030 | clear_bit(RXRPC_CALL_LIFE_TIMER, &call->events); | |
1031 | goto kill_ACKs; | |
1032 | } | |
1033 | ||
1034 | /* deal with assorted inbound messages */ | |
1035 | if (!skb_queue_empty(&call->rx_queue)) { | |
1036 | switch (rxrpc_process_rx_queue(call, &abort_code)) { | |
1037 | case 0: | |
1038 | case -EAGAIN: | |
1039 | break; | |
1040 | case -ENOMEM: | |
1041 | goto no_mem; | |
1042 | case -EKEYEXPIRED: | |
1043 | case -EKEYREJECTED: | |
1044 | case -EPROTO: | |
1045 | rxrpc_abort_call(call, abort_code); | |
1046 | goto kill_ACKs; | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | /* handle resending */ | |
1051 | if (test_and_clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events)) | |
1052 | rxrpc_resend_timer(call); | |
1053 | if (test_and_clear_bit(RXRPC_CALL_RESEND, &call->events)) | |
1054 | rxrpc_resend(call); | |
1055 | ||
1056 | /* consider sending an ordinary ACK */ | |
1057 | if (test_bit(RXRPC_CALL_ACK, &call->events)) { | |
17926a79 DH |
1058 | _debug("send ACK: window: %d - %d { %lx }", |
1059 | call->rx_data_eaten, call->ackr_win_top, | |
1060 | call->ackr_window[0]); | |
1061 | ||
1062 | if (call->state > RXRPC_CALL_SERVER_ACK_REQUEST && | |
1063 | call->ackr_reason != RXRPC_ACK_PING_RESPONSE) { | |
1064 | /* ACK by sending reply DATA packet in this state */ | |
1065 | clear_bit(RXRPC_CALL_ACK, &call->events); | |
1066 | goto maybe_reschedule; | |
1067 | } | |
1068 | ||
1069 | genbit = RXRPC_CALL_ACK; | |
1070 | ||
1071 | acks = kzalloc(call->ackr_win_top - call->rx_data_eaten, | |
1072 | GFP_NOFS); | |
1073 | if (!acks) | |
1074 | goto no_mem; | |
1075 | ||
1076 | //hdr.flags = RXRPC_SLOW_START_OK; | |
1077 | ack.bufferSpace = htons(8); | |
1078 | ack.maxSkew = 0; | |
1079 | ack.serial = 0; | |
1080 | ack.reason = 0; | |
1081 | ||
17926a79 DH |
1082 | spin_lock_bh(&call->lock); |
1083 | ack.reason = call->ackr_reason; | |
1084 | ack.serial = call->ackr_serial; | |
1085 | ack.previousPacket = call->ackr_prev_seq; | |
1086 | ack.firstPacket = htonl(call->rx_data_eaten + 1); | |
1087 | ||
1088 | ack.nAcks = 0; | |
1089 | for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) { | |
1090 | nbit = loop * BITS_PER_LONG; | |
1091 | for (bits = call->ackr_window[loop]; bits; bits >>= 1 | |
1092 | ) { | |
1093 | _debug("- l=%d n=%d b=%lx", loop, nbit, bits); | |
1094 | if (bits & 1) { | |
1095 | acks[nbit] = RXRPC_ACK_TYPE_ACK; | |
1096 | ack.nAcks = nbit + 1; | |
1097 | } | |
1098 | nbit++; | |
1099 | } | |
1100 | } | |
1101 | call->ackr_reason = 0; | |
1102 | spin_unlock_bh(&call->lock); | |
1103 | ||
1104 | pad = 0; | |
1105 | ||
1106 | iov[1].iov_base = &ack; | |
1107 | iov[1].iov_len = sizeof(ack); | |
1108 | iov[2].iov_base = acks; | |
1109 | iov[2].iov_len = ack.nAcks; | |
1110 | iov[3].iov_base = &pad; | |
1111 | iov[3].iov_len = 3; | |
1112 | iov[4].iov_base = &ackinfo; | |
1113 | iov[4].iov_len = sizeof(ackinfo); | |
1114 | ||
1115 | switch (ack.reason) { | |
1116 | case RXRPC_ACK_REQUESTED: | |
1117 | case RXRPC_ACK_DUPLICATE: | |
1118 | case RXRPC_ACK_OUT_OF_SEQUENCE: | |
1119 | case RXRPC_ACK_EXCEEDS_WINDOW: | |
1120 | case RXRPC_ACK_NOSPACE: | |
1121 | case RXRPC_ACK_PING: | |
1122 | case RXRPC_ACK_PING_RESPONSE: | |
1123 | goto send_ACK_with_skew; | |
1124 | case RXRPC_ACK_DELAY: | |
1125 | case RXRPC_ACK_IDLE: | |
1126 | goto send_ACK; | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | /* handle completion of security negotiations on an incoming | |
1131 | * connection */ | |
1132 | if (test_and_clear_bit(RXRPC_CALL_SECURED, &call->events)) { | |
1133 | _debug("secured"); | |
1134 | spin_lock_bh(&call->lock); | |
1135 | ||
1136 | if (call->state == RXRPC_CALL_SERVER_SECURING) { | |
1137 | _debug("securing"); | |
1138 | write_lock(&call->conn->lock); | |
1139 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
1140 | !test_bit(RXRPC_CALL_RELEASE, &call->events)) { | |
1141 | _debug("not released"); | |
1142 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
1143 | list_move_tail(&call->accept_link, | |
1144 | &call->socket->acceptq); | |
1145 | } | |
1146 | write_unlock(&call->conn->lock); | |
1147 | read_lock(&call->state_lock); | |
1148 | if (call->state < RXRPC_CALL_COMPLETE) | |
1149 | set_bit(RXRPC_CALL_POST_ACCEPT, &call->events); | |
1150 | read_unlock(&call->state_lock); | |
1151 | } | |
1152 | ||
1153 | spin_unlock_bh(&call->lock); | |
1154 | if (!test_bit(RXRPC_CALL_POST_ACCEPT, &call->events)) | |
1155 | goto maybe_reschedule; | |
1156 | } | |
1157 | ||
1158 | /* post a notification of an acceptable connection to the app */ | |
1159 | if (test_bit(RXRPC_CALL_POST_ACCEPT, &call->events)) { | |
1160 | _debug("post accept"); | |
1161 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NEW_CALL, | |
1162 | 0, false) < 0) | |
1163 | goto no_mem; | |
1164 | clear_bit(RXRPC_CALL_POST_ACCEPT, &call->events); | |
1165 | goto maybe_reschedule; | |
1166 | } | |
1167 | ||
1168 | /* handle incoming call acceptance */ | |
1169 | if (test_and_clear_bit(RXRPC_CALL_ACCEPTED, &call->events)) { | |
1170 | _debug("accepted"); | |
1171 | ASSERTCMP(call->rx_data_post, ==, 0); | |
1172 | call->rx_data_post = 1; | |
1173 | read_lock_bh(&call->state_lock); | |
1174 | if (call->state < RXRPC_CALL_COMPLETE) | |
1175 | set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events); | |
1176 | read_unlock_bh(&call->state_lock); | |
1177 | } | |
1178 | ||
1179 | /* drain the out of sequence received packet queue into the packet Rx | |
1180 | * queue */ | |
1181 | if (test_and_clear_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events)) { | |
1182 | while (call->rx_data_post == call->rx_first_oos) | |
1183 | if (rxrpc_drain_rx_oos_queue(call) < 0) | |
1184 | break; | |
1185 | goto maybe_reschedule; | |
1186 | } | |
1187 | ||
1188 | /* other events may have been raised since we started checking */ | |
1189 | goto maybe_reschedule; | |
1190 | ||
1191 | send_ACK_with_skew: | |
1192 | ack.maxSkew = htons(atomic_read(&call->conn->hi_serial) - | |
1193 | ntohl(ack.serial)); | |
1194 | send_ACK: | |
224711df DH |
1195 | mtu = call->conn->trans->peer->if_mtu; |
1196 | mtu -= call->conn->trans->peer->hdrsize; | |
1197 | ackinfo.maxMTU = htonl(mtu); | |
1198 | ackinfo.rwind = htonl(32); | |
1199 | ||
1200 | /* permit the peer to send us jumbo packets if it wants to */ | |
1201 | ackinfo.rxMTU = htonl(5692); | |
1202 | ackinfo.jumbo_max = htonl(4); | |
1203 | ||
17926a79 DH |
1204 | hdr.serial = htonl(atomic_inc_return(&call->conn->serial)); |
1205 | _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", | |
1206 | ntohl(hdr.serial), | |
1207 | ntohs(ack.maxSkew), | |
1208 | ntohl(ack.firstPacket), | |
1209 | ntohl(ack.previousPacket), | |
1210 | ntohl(ack.serial), | |
08d4d217 | 1211 | rxrpc_acks(ack.reason), |
17926a79 DH |
1212 | ack.nAcks); |
1213 | ||
1214 | del_timer_sync(&call->ack_timer); | |
1215 | if (ack.nAcks > 0) | |
1216 | set_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags); | |
1217 | goto send_message_2; | |
1218 | ||
1219 | send_message: | |
1220 | _debug("send message"); | |
1221 | ||
1222 | hdr.serial = htonl(atomic_inc_return(&call->conn->serial)); | |
1223 | _proto("Tx %s %%%u", rxrpc_pkts[hdr.type], ntohl(hdr.serial)); | |
1224 | send_message_2: | |
1225 | ||
1226 | len = iov[0].iov_len; | |
1227 | ioc = 1; | |
1228 | if (iov[4].iov_len) { | |
1229 | ioc = 5; | |
1230 | len += iov[4].iov_len; | |
1231 | len += iov[3].iov_len; | |
1232 | len += iov[2].iov_len; | |
1233 | len += iov[1].iov_len; | |
1234 | } else if (iov[3].iov_len) { | |
1235 | ioc = 4; | |
1236 | len += iov[3].iov_len; | |
1237 | len += iov[2].iov_len; | |
1238 | len += iov[1].iov_len; | |
1239 | } else if (iov[2].iov_len) { | |
1240 | ioc = 3; | |
1241 | len += iov[2].iov_len; | |
1242 | len += iov[1].iov_len; | |
1243 | } else if (iov[1].iov_len) { | |
1244 | ioc = 2; | |
1245 | len += iov[1].iov_len; | |
1246 | } | |
1247 | ||
1248 | ret = kernel_sendmsg(call->conn->trans->local->socket, | |
1249 | &msg, iov, ioc, len); | |
1250 | if (ret < 0) { | |
1251 | _debug("sendmsg failed: %d", ret); | |
1252 | read_lock_bh(&call->state_lock); | |
1253 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1254 | rxrpc_queue_call(call); |
17926a79 DH |
1255 | read_unlock_bh(&call->state_lock); |
1256 | goto error; | |
1257 | } | |
1258 | ||
1259 | switch (genbit) { | |
1260 | case RXRPC_CALL_ABORT: | |
1261 | clear_bit(genbit, &call->events); | |
1262 | clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events); | |
1263 | goto kill_ACKs; | |
1264 | ||
1265 | case RXRPC_CALL_ACK_FINAL: | |
1266 | write_lock_bh(&call->state_lock); | |
1267 | if (call->state == RXRPC_CALL_CLIENT_FINAL_ACK) | |
1268 | call->state = RXRPC_CALL_COMPLETE; | |
1269 | write_unlock_bh(&call->state_lock); | |
1270 | goto kill_ACKs; | |
1271 | ||
1272 | default: | |
1273 | clear_bit(genbit, &call->events); | |
1274 | switch (call->state) { | |
1275 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
1276 | case RXRPC_CALL_CLIENT_RECV_REPLY: | |
1277 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
1278 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
1279 | _debug("start ACK timer"); | |
1280 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, | |
1281 | call->ackr_serial, false); | |
1282 | default: | |
1283 | break; | |
1284 | } | |
1285 | goto maybe_reschedule; | |
1286 | } | |
1287 | ||
1288 | kill_ACKs: | |
1289 | del_timer_sync(&call->ack_timer); | |
1290 | if (test_and_clear_bit(RXRPC_CALL_ACK_FINAL, &call->events)) | |
1291 | rxrpc_put_call(call); | |
1292 | clear_bit(RXRPC_CALL_ACK, &call->events); | |
1293 | ||
1294 | maybe_reschedule: | |
1295 | if (call->events || !skb_queue_empty(&call->rx_queue)) { | |
1296 | read_lock_bh(&call->state_lock); | |
1297 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1298 | rxrpc_queue_call(call); |
17926a79 DH |
1299 | read_unlock_bh(&call->state_lock); |
1300 | } | |
1301 | ||
1302 | /* don't leave aborted connections on the accept queue */ | |
1303 | if (call->state >= RXRPC_CALL_COMPLETE && | |
1304 | !list_empty(&call->accept_link)) { | |
1305 | _debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }", | |
1306 | call, call->events, call->flags, | |
1307 | ntohl(call->conn->cid)); | |
1308 | ||
1309 | read_lock_bh(&call->state_lock); | |
1310 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
1311 | !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) | |
651350d1 | 1312 | rxrpc_queue_call(call); |
17926a79 DH |
1313 | read_unlock_bh(&call->state_lock); |
1314 | } | |
1315 | ||
1316 | error: | |
1317 | clear_bit(RXRPC_CALL_PROC_BUSY, &call->flags); | |
1318 | kfree(acks); | |
1319 | ||
1320 | /* because we don't want two CPUs both processing the work item for one | |
1321 | * call at the same time, we use a flag to note when it's busy; however | |
1322 | * this means there's a race between clearing the flag and setting the | |
1323 | * work pending bit and the work item being processed again */ | |
1324 | if (call->events && !work_pending(&call->processor)) { | |
1325 | _debug("jumpstart %x", ntohl(call->conn->cid)); | |
651350d1 | 1326 | rxrpc_queue_call(call); |
17926a79 DH |
1327 | } |
1328 | ||
1329 | _leave(""); | |
1330 | return; | |
1331 | ||
1332 | no_mem: | |
1333 | _debug("out of memory"); | |
1334 | goto maybe_reschedule; | |
1335 | } |