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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 | ||
22 | static unsigned rxrpc_ack_defer = 1; | |
23 | ||
36cbd3dc | 24 | static const char *const rxrpc_acks[] = { |
17926a79 DH |
25 | "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY", "IDL", |
26 | "-?-" | |
27 | }; | |
28 | ||
29 | static const s8 rxrpc_ack_priority[] = { | |
30 | [0] = 0, | |
31 | [RXRPC_ACK_DELAY] = 1, | |
32 | [RXRPC_ACK_REQUESTED] = 2, | |
33 | [RXRPC_ACK_IDLE] = 3, | |
34 | [RXRPC_ACK_PING_RESPONSE] = 4, | |
35 | [RXRPC_ACK_DUPLICATE] = 5, | |
36 | [RXRPC_ACK_OUT_OF_SEQUENCE] = 6, | |
37 | [RXRPC_ACK_EXCEEDS_WINDOW] = 7, | |
38 | [RXRPC_ACK_NOSPACE] = 8, | |
39 | }; | |
40 | ||
41 | /* | |
42 | * propose an ACK be sent | |
43 | */ | |
4e36a95e | 44 | void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
17926a79 DH |
45 | __be32 serial, bool immediate) |
46 | { | |
47 | unsigned long expiry; | |
48 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
49 | ||
50 | ASSERTCMP(prior, >, 0); | |
51 | ||
52 | _enter("{%d},%s,%%%x,%u", | |
53 | call->debug_id, rxrpc_acks[ack_reason], ntohl(serial), | |
54 | immediate); | |
55 | ||
56 | if (prior < rxrpc_ack_priority[call->ackr_reason]) { | |
57 | if (immediate) | |
58 | goto cancel_timer; | |
59 | return; | |
60 | } | |
61 | ||
62 | /* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial | |
63 | * numbers */ | |
64 | if (prior == rxrpc_ack_priority[call->ackr_reason]) { | |
65 | if (prior <= 4) | |
66 | call->ackr_serial = serial; | |
67 | if (immediate) | |
68 | goto cancel_timer; | |
69 | return; | |
70 | } | |
71 | ||
72 | call->ackr_reason = ack_reason; | |
73 | call->ackr_serial = serial; | |
74 | ||
75 | switch (ack_reason) { | |
76 | case RXRPC_ACK_DELAY: | |
77 | _debug("run delay timer"); | |
78 | call->ack_timer.expires = jiffies + rxrpc_ack_timeout * HZ; | |
79 | add_timer(&call->ack_timer); | |
80 | return; | |
81 | ||
82 | case RXRPC_ACK_IDLE: | |
83 | if (!immediate) { | |
84 | _debug("run defer timer"); | |
85 | expiry = 1; | |
86 | goto run_timer; | |
87 | } | |
88 | goto cancel_timer; | |
89 | ||
90 | case RXRPC_ACK_REQUESTED: | |
91 | if (!rxrpc_ack_defer) | |
92 | goto cancel_timer; | |
93 | if (!immediate || serial == cpu_to_be32(1)) { | |
94 | _debug("run defer timer"); | |
95 | expiry = rxrpc_ack_defer; | |
96 | goto run_timer; | |
97 | } | |
98 | ||
99 | default: | |
100 | _debug("immediate ACK"); | |
101 | goto cancel_timer; | |
102 | } | |
103 | ||
104 | run_timer: | |
105 | expiry += jiffies; | |
106 | if (!timer_pending(&call->ack_timer) || | |
107 | time_after(call->ack_timer.expires, expiry)) | |
108 | mod_timer(&call->ack_timer, expiry); | |
109 | return; | |
110 | ||
111 | cancel_timer: | |
112 | _debug("cancel timer %%%u", ntohl(serial)); | |
113 | try_to_del_timer_sync(&call->ack_timer); | |
114 | read_lock_bh(&call->state_lock); | |
115 | if (call->state <= RXRPC_CALL_COMPLETE && | |
116 | !test_and_set_bit(RXRPC_CALL_ACK, &call->events)) | |
651350d1 | 117 | rxrpc_queue_call(call); |
17926a79 DH |
118 | read_unlock_bh(&call->state_lock); |
119 | } | |
120 | ||
121 | /* | |
122 | * propose an ACK be sent, locking the call structure | |
123 | */ | |
4e36a95e | 124 | void rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
17926a79 DH |
125 | __be32 serial, bool immediate) |
126 | { | |
127 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
128 | ||
129 | if (prior > rxrpc_ack_priority[call->ackr_reason]) { | |
130 | spin_lock_bh(&call->lock); | |
131 | __rxrpc_propose_ACK(call, ack_reason, serial, immediate); | |
132 | spin_unlock_bh(&call->lock); | |
133 | } | |
134 | } | |
135 | ||
136 | /* | |
137 | * set the resend timer | |
138 | */ | |
139 | static void rxrpc_set_resend(struct rxrpc_call *call, u8 resend, | |
140 | unsigned long resend_at) | |
141 | { | |
142 | read_lock_bh(&call->state_lock); | |
143 | if (call->state >= RXRPC_CALL_COMPLETE) | |
144 | resend = 0; | |
145 | ||
146 | if (resend & 1) { | |
147 | _debug("SET RESEND"); | |
148 | set_bit(RXRPC_CALL_RESEND, &call->events); | |
149 | } | |
150 | ||
151 | if (resend & 2) { | |
152 | _debug("MODIFY RESEND TIMER"); | |
153 | set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
154 | mod_timer(&call->resend_timer, resend_at); | |
155 | } else { | |
156 | _debug("KILL RESEND TIMER"); | |
157 | del_timer_sync(&call->resend_timer); | |
158 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); | |
159 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
160 | } | |
161 | read_unlock_bh(&call->state_lock); | |
162 | } | |
163 | ||
164 | /* | |
165 | * resend packets | |
166 | */ | |
167 | static void rxrpc_resend(struct rxrpc_call *call) | |
168 | { | |
169 | struct rxrpc_skb_priv *sp; | |
170 | struct rxrpc_header *hdr; | |
171 | struct sk_buff *txb; | |
172 | unsigned long *p_txb, resend_at; | |
173 | int loop, stop; | |
174 | u8 resend; | |
175 | ||
176 | _enter("{%d,%d,%d,%d},", | |
177 | call->acks_hard, call->acks_unacked, | |
178 | atomic_read(&call->sequence), | |
179 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
180 | ||
181 | stop = 0; | |
182 | resend = 0; | |
183 | resend_at = 0; | |
184 | ||
185 | for (loop = call->acks_tail; | |
186 | loop != call->acks_head || stop; | |
187 | loop = (loop + 1) & (call->acks_winsz - 1) | |
188 | ) { | |
189 | p_txb = call->acks_window + loop; | |
190 | smp_read_barrier_depends(); | |
191 | if (*p_txb & 1) | |
192 | continue; | |
193 | ||
194 | txb = (struct sk_buff *) *p_txb; | |
195 | sp = rxrpc_skb(txb); | |
196 | ||
197 | if (sp->need_resend) { | |
198 | sp->need_resend = 0; | |
199 | ||
200 | /* each Tx packet has a new serial number */ | |
201 | sp->hdr.serial = | |
202 | htonl(atomic_inc_return(&call->conn->serial)); | |
203 | ||
204 | hdr = (struct rxrpc_header *) txb->head; | |
205 | hdr->serial = sp->hdr.serial; | |
206 | ||
207 | _proto("Tx DATA %%%u { #%d }", | |
208 | ntohl(sp->hdr.serial), ntohl(sp->hdr.seq)); | |
209 | if (rxrpc_send_packet(call->conn->trans, txb) < 0) { | |
210 | stop = 0; | |
211 | sp->resend_at = jiffies + 3; | |
212 | } else { | |
213 | sp->resend_at = | |
214 | jiffies + rxrpc_resend_timeout * HZ; | |
215 | } | |
216 | } | |
217 | ||
218 | if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
219 | sp->need_resend = 1; | |
220 | resend |= 1; | |
221 | } else if (resend & 2) { | |
222 | if (time_before(sp->resend_at, resend_at)) | |
223 | resend_at = sp->resend_at; | |
224 | } else { | |
225 | resend_at = sp->resend_at; | |
226 | resend |= 2; | |
227 | } | |
228 | } | |
229 | ||
230 | rxrpc_set_resend(call, resend, resend_at); | |
231 | _leave(""); | |
232 | } | |
233 | ||
234 | /* | |
235 | * handle resend timer expiry | |
236 | */ | |
237 | static void rxrpc_resend_timer(struct rxrpc_call *call) | |
238 | { | |
239 | struct rxrpc_skb_priv *sp; | |
240 | struct sk_buff *txb; | |
241 | unsigned long *p_txb, resend_at; | |
242 | int loop; | |
243 | u8 resend; | |
244 | ||
245 | _enter("%d,%d,%d", | |
246 | call->acks_tail, call->acks_unacked, call->acks_head); | |
247 | ||
3b5bac2b DH |
248 | if (call->state >= RXRPC_CALL_COMPLETE) |
249 | return; | |
250 | ||
17926a79 DH |
251 | resend = 0; |
252 | resend_at = 0; | |
253 | ||
254 | for (loop = call->acks_unacked; | |
255 | loop != call->acks_head; | |
256 | loop = (loop + 1) & (call->acks_winsz - 1) | |
257 | ) { | |
258 | p_txb = call->acks_window + loop; | |
259 | smp_read_barrier_depends(); | |
260 | txb = (struct sk_buff *) (*p_txb & ~1); | |
261 | sp = rxrpc_skb(txb); | |
262 | ||
263 | ASSERT(!(*p_txb & 1)); | |
264 | ||
265 | if (sp->need_resend) { | |
266 | ; | |
267 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
268 | sp->need_resend = 1; | |
269 | resend |= 1; | |
270 | } else if (resend & 2) { | |
271 | if (time_before(sp->resend_at, resend_at)) | |
272 | resend_at = sp->resend_at; | |
273 | } else { | |
274 | resend_at = sp->resend_at; | |
275 | resend |= 2; | |
276 | } | |
277 | } | |
278 | ||
279 | rxrpc_set_resend(call, resend, resend_at); | |
280 | _leave(""); | |
281 | } | |
282 | ||
283 | /* | |
284 | * process soft ACKs of our transmitted packets | |
285 | * - these indicate packets the peer has or has not received, but hasn't yet | |
286 | * given to the consumer, and so can still be discarded and re-requested | |
287 | */ | |
288 | static int rxrpc_process_soft_ACKs(struct rxrpc_call *call, | |
289 | struct rxrpc_ackpacket *ack, | |
290 | struct sk_buff *skb) | |
291 | { | |
292 | struct rxrpc_skb_priv *sp; | |
293 | struct sk_buff *txb; | |
294 | unsigned long *p_txb, resend_at; | |
295 | int loop; | |
296 | u8 sacks[RXRPC_MAXACKS], resend; | |
297 | ||
298 | _enter("{%d,%d},{%d},", | |
299 | call->acks_hard, | |
300 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz), | |
301 | ack->nAcks); | |
302 | ||
303 | if (skb_copy_bits(skb, 0, sacks, ack->nAcks) < 0) | |
304 | goto protocol_error; | |
305 | ||
306 | resend = 0; | |
307 | resend_at = 0; | |
308 | for (loop = 0; loop < ack->nAcks; loop++) { | |
309 | p_txb = call->acks_window; | |
310 | p_txb += (call->acks_tail + loop) & (call->acks_winsz - 1); | |
311 | smp_read_barrier_depends(); | |
312 | txb = (struct sk_buff *) (*p_txb & ~1); | |
313 | sp = rxrpc_skb(txb); | |
314 | ||
315 | switch (sacks[loop]) { | |
316 | case RXRPC_ACK_TYPE_ACK: | |
317 | sp->need_resend = 0; | |
318 | *p_txb |= 1; | |
319 | break; | |
320 | case RXRPC_ACK_TYPE_NACK: | |
321 | sp->need_resend = 1; | |
322 | *p_txb &= ~1; | |
323 | resend = 1; | |
324 | break; | |
325 | default: | |
326 | _debug("Unsupported ACK type %d", sacks[loop]); | |
327 | goto protocol_error; | |
328 | } | |
329 | } | |
330 | ||
331 | smp_mb(); | |
332 | call->acks_unacked = (call->acks_tail + loop) & (call->acks_winsz - 1); | |
333 | ||
334 | /* anything not explicitly ACK'd is implicitly NACK'd, but may just not | |
335 | * have been received or processed yet by the far end */ | |
336 | for (loop = call->acks_unacked; | |
337 | loop != call->acks_head; | |
338 | loop = (loop + 1) & (call->acks_winsz - 1) | |
339 | ) { | |
340 | p_txb = call->acks_window + loop; | |
341 | smp_read_barrier_depends(); | |
342 | txb = (struct sk_buff *) (*p_txb & ~1); | |
343 | sp = rxrpc_skb(txb); | |
344 | ||
345 | if (*p_txb & 1) { | |
346 | /* packet must have been discarded */ | |
347 | sp->need_resend = 1; | |
348 | *p_txb &= ~1; | |
349 | resend |= 1; | |
350 | } else if (sp->need_resend) { | |
351 | ; | |
352 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
353 | sp->need_resend = 1; | |
354 | resend |= 1; | |
355 | } else if (resend & 2) { | |
356 | if (time_before(sp->resend_at, resend_at)) | |
357 | resend_at = sp->resend_at; | |
358 | } else { | |
359 | resend_at = sp->resend_at; | |
360 | resend |= 2; | |
361 | } | |
362 | } | |
363 | ||
364 | rxrpc_set_resend(call, resend, resend_at); | |
365 | _leave(" = 0"); | |
366 | return 0; | |
367 | ||
368 | protocol_error: | |
369 | _leave(" = -EPROTO"); | |
370 | return -EPROTO; | |
371 | } | |
372 | ||
373 | /* | |
374 | * discard hard-ACK'd packets from the Tx window | |
375 | */ | |
376 | static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard) | |
377 | { | |
378 | struct rxrpc_skb_priv *sp; | |
379 | unsigned long _skb; | |
380 | int tail = call->acks_tail, old_tail; | |
381 | int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz); | |
382 | ||
383 | _enter("{%u,%u},%u", call->acks_hard, win, hard); | |
384 | ||
385 | ASSERTCMP(hard - call->acks_hard, <=, win); | |
386 | ||
387 | while (call->acks_hard < hard) { | |
388 | smp_read_barrier_depends(); | |
389 | _skb = call->acks_window[tail] & ~1; | |
390 | sp = rxrpc_skb((struct sk_buff *) _skb); | |
391 | rxrpc_free_skb((struct sk_buff *) _skb); | |
392 | old_tail = tail; | |
393 | tail = (tail + 1) & (call->acks_winsz - 1); | |
394 | call->acks_tail = tail; | |
395 | if (call->acks_unacked == old_tail) | |
396 | call->acks_unacked = tail; | |
397 | call->acks_hard++; | |
398 | } | |
399 | ||
400 | wake_up(&call->tx_waitq); | |
401 | } | |
402 | ||
403 | /* | |
404 | * clear the Tx window in the event of a failure | |
405 | */ | |
406 | static void rxrpc_clear_tx_window(struct rxrpc_call *call) | |
407 | { | |
408 | rxrpc_rotate_tx_window(call, atomic_read(&call->sequence)); | |
409 | } | |
410 | ||
411 | /* | |
412 | * drain the out of sequence received packet queue into the packet Rx queue | |
413 | */ | |
414 | static int rxrpc_drain_rx_oos_queue(struct rxrpc_call *call) | |
415 | { | |
416 | struct rxrpc_skb_priv *sp; | |
417 | struct sk_buff *skb; | |
418 | bool terminal; | |
419 | int ret; | |
420 | ||
421 | _enter("{%d,%d}", call->rx_data_post, call->rx_first_oos); | |
422 | ||
423 | spin_lock_bh(&call->lock); | |
424 | ||
425 | ret = -ECONNRESET; | |
426 | if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
427 | goto socket_unavailable; | |
428 | ||
429 | skb = skb_dequeue(&call->rx_oos_queue); | |
430 | if (skb) { | |
431 | sp = rxrpc_skb(skb); | |
432 | ||
433 | _debug("drain OOS packet %d [%d]", | |
434 | ntohl(sp->hdr.seq), call->rx_first_oos); | |
435 | ||
436 | if (ntohl(sp->hdr.seq) != call->rx_first_oos) { | |
437 | skb_queue_head(&call->rx_oos_queue, skb); | |
438 | call->rx_first_oos = ntohl(rxrpc_skb(skb)->hdr.seq); | |
439 | _debug("requeue %p {%u}", skb, call->rx_first_oos); | |
440 | } else { | |
441 | skb->mark = RXRPC_SKB_MARK_DATA; | |
442 | terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && | |
443 | !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); | |
444 | ret = rxrpc_queue_rcv_skb(call, skb, true, terminal); | |
445 | BUG_ON(ret < 0); | |
446 | _debug("drain #%u", call->rx_data_post); | |
447 | call->rx_data_post++; | |
448 | ||
449 | /* find out what the next packet is */ | |
450 | skb = skb_peek(&call->rx_oos_queue); | |
451 | if (skb) | |
452 | call->rx_first_oos = | |
453 | ntohl(rxrpc_skb(skb)->hdr.seq); | |
454 | else | |
455 | call->rx_first_oos = 0; | |
456 | _debug("peek %p {%u}", skb, call->rx_first_oos); | |
457 | } | |
458 | } | |
459 | ||
460 | ret = 0; | |
461 | socket_unavailable: | |
462 | spin_unlock_bh(&call->lock); | |
463 | _leave(" = %d", ret); | |
464 | return ret; | |
465 | } | |
466 | ||
467 | /* | |
468 | * insert an out of sequence packet into the buffer | |
469 | */ | |
470 | static void rxrpc_insert_oos_packet(struct rxrpc_call *call, | |
471 | struct sk_buff *skb) | |
472 | { | |
473 | struct rxrpc_skb_priv *sp, *psp; | |
474 | struct sk_buff *p; | |
475 | u32 seq; | |
476 | ||
477 | sp = rxrpc_skb(skb); | |
478 | seq = ntohl(sp->hdr.seq); | |
479 | _enter(",,{%u}", seq); | |
480 | ||
481 | skb->destructor = rxrpc_packet_destructor; | |
482 | ASSERTCMP(sp->call, ==, NULL); | |
483 | sp->call = call; | |
484 | rxrpc_get_call(call); | |
485 | ||
486 | /* insert into the buffer in sequence order */ | |
487 | spin_lock_bh(&call->lock); | |
488 | ||
489 | skb_queue_walk(&call->rx_oos_queue, p) { | |
490 | psp = rxrpc_skb(p); | |
491 | if (ntohl(psp->hdr.seq) > seq) { | |
492 | _debug("insert oos #%u before #%u", | |
493 | seq, ntohl(psp->hdr.seq)); | |
494 | skb_insert(p, skb, &call->rx_oos_queue); | |
495 | goto inserted; | |
496 | } | |
497 | } | |
498 | ||
499 | _debug("append oos #%u", seq); | |
500 | skb_queue_tail(&call->rx_oos_queue, skb); | |
501 | inserted: | |
502 | ||
503 | /* we might now have a new front to the queue */ | |
504 | if (call->rx_first_oos == 0 || seq < call->rx_first_oos) | |
505 | call->rx_first_oos = seq; | |
506 | ||
507 | read_lock(&call->state_lock); | |
508 | if (call->state < RXRPC_CALL_COMPLETE && | |
509 | call->rx_data_post == call->rx_first_oos) { | |
510 | _debug("drain rx oos now"); | |
511 | set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events); | |
512 | } | |
513 | read_unlock(&call->state_lock); | |
514 | ||
515 | spin_unlock_bh(&call->lock); | |
516 | _leave(" [stored #%u]", call->rx_first_oos); | |
517 | } | |
518 | ||
519 | /* | |
520 | * clear the Tx window on final ACK reception | |
521 | */ | |
522 | static void rxrpc_zap_tx_window(struct rxrpc_call *call) | |
523 | { | |
524 | struct rxrpc_skb_priv *sp; | |
525 | struct sk_buff *skb; | |
526 | unsigned long _skb, *acks_window; | |
4e36a95e | 527 | u8 winsz = call->acks_winsz; |
17926a79 DH |
528 | int tail; |
529 | ||
530 | acks_window = call->acks_window; | |
531 | call->acks_window = NULL; | |
532 | ||
533 | while (CIRC_CNT(call->acks_head, call->acks_tail, winsz) > 0) { | |
534 | tail = call->acks_tail; | |
535 | smp_read_barrier_depends(); | |
536 | _skb = acks_window[tail] & ~1; | |
537 | smp_mb(); | |
538 | call->acks_tail = (call->acks_tail + 1) & (winsz - 1); | |
539 | ||
540 | skb = (struct sk_buff *) _skb; | |
541 | sp = rxrpc_skb(skb); | |
542 | _debug("+++ clear Tx %u", ntohl(sp->hdr.seq)); | |
543 | rxrpc_free_skb(skb); | |
544 | } | |
545 | ||
546 | kfree(acks_window); | |
547 | } | |
548 | ||
224711df DH |
549 | /* |
550 | * process the extra information that may be appended to an ACK packet | |
551 | */ | |
552 | static void rxrpc_extract_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, | |
553 | unsigned latest, int nAcks) | |
554 | { | |
555 | struct rxrpc_ackinfo ackinfo; | |
556 | struct rxrpc_peer *peer; | |
557 | unsigned mtu; | |
558 | ||
559 | if (skb_copy_bits(skb, nAcks + 3, &ackinfo, sizeof(ackinfo)) < 0) { | |
560 | _leave(" [no ackinfo]"); | |
561 | return; | |
562 | } | |
563 | ||
564 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
565 | latest, | |
566 | ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU), | |
567 | ntohl(ackinfo.rwind), ntohl(ackinfo.jumbo_max)); | |
568 | ||
569 | mtu = min(ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU)); | |
570 | ||
571 | peer = call->conn->trans->peer; | |
572 | if (mtu < peer->maxdata) { | |
573 | spin_lock_bh(&peer->lock); | |
574 | peer->maxdata = mtu; | |
575 | peer->mtu = mtu + peer->hdrsize; | |
576 | spin_unlock_bh(&peer->lock); | |
577 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
578 | } | |
579 | } | |
580 | ||
17926a79 DH |
581 | /* |
582 | * process packets in the reception queue | |
583 | */ | |
584 | static int rxrpc_process_rx_queue(struct rxrpc_call *call, | |
585 | u32 *_abort_code) | |
586 | { | |
587 | struct rxrpc_ackpacket ack; | |
588 | struct rxrpc_skb_priv *sp; | |
589 | struct sk_buff *skb; | |
590 | bool post_ACK; | |
591 | int latest; | |
592 | u32 hard, tx; | |
593 | ||
594 | _enter(""); | |
595 | ||
596 | process_further: | |
597 | skb = skb_dequeue(&call->rx_queue); | |
598 | if (!skb) | |
599 | return -EAGAIN; | |
600 | ||
601 | _net("deferred skb %p", skb); | |
602 | ||
603 | sp = rxrpc_skb(skb); | |
604 | ||
605 | _debug("process %s [st %d]", rxrpc_pkts[sp->hdr.type], call->state); | |
606 | ||
607 | post_ACK = false; | |
608 | ||
609 | switch (sp->hdr.type) { | |
610 | /* data packets that wind up here have been received out of | |
611 | * order, need security processing or are jumbo packets */ | |
612 | case RXRPC_PACKET_TYPE_DATA: | |
613 | _proto("OOSQ DATA %%%u { #%u }", | |
614 | ntohl(sp->hdr.serial), ntohl(sp->hdr.seq)); | |
615 | ||
616 | /* secured packets must be verified and possibly decrypted */ | |
617 | if (rxrpc_verify_packet(call, skb, _abort_code) < 0) | |
618 | goto protocol_error; | |
619 | ||
620 | rxrpc_insert_oos_packet(call, skb); | |
621 | goto process_further; | |
622 | ||
623 | /* partial ACK to process */ | |
624 | case RXRPC_PACKET_TYPE_ACK: | |
625 | if (skb_copy_bits(skb, 0, &ack, sizeof(ack)) < 0) { | |
626 | _debug("extraction failure"); | |
627 | goto protocol_error; | |
628 | } | |
629 | if (!skb_pull(skb, sizeof(ack))) | |
630 | BUG(); | |
631 | ||
632 | latest = ntohl(sp->hdr.serial); | |
633 | hard = ntohl(ack.firstPacket); | |
634 | tx = atomic_read(&call->sequence); | |
635 | ||
636 | _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", | |
637 | latest, | |
638 | ntohs(ack.maxSkew), | |
639 | hard, | |
640 | ntohl(ack.previousPacket), | |
641 | ntohl(ack.serial), | |
642 | rxrpc_acks[ack.reason], | |
643 | ack.nAcks); | |
644 | ||
224711df DH |
645 | rxrpc_extract_ackinfo(call, skb, latest, ack.nAcks); |
646 | ||
17926a79 DH |
647 | if (ack.reason == RXRPC_ACK_PING) { |
648 | _proto("Rx ACK %%%u PING Request", latest); | |
649 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, | |
650 | sp->hdr.serial, true); | |
651 | } | |
652 | ||
653 | /* discard any out-of-order or duplicate ACKs */ | |
654 | if (latest - call->acks_latest <= 0) { | |
655 | _debug("discard ACK %d <= %d", | |
656 | latest, call->acks_latest); | |
657 | goto discard; | |
658 | } | |
659 | call->acks_latest = latest; | |
660 | ||
661 | if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
662 | call->state != RXRPC_CALL_CLIENT_AWAIT_REPLY && | |
663 | call->state != RXRPC_CALL_SERVER_SEND_REPLY && | |
664 | call->state != RXRPC_CALL_SERVER_AWAIT_ACK) | |
665 | goto discard; | |
666 | ||
667 | _debug("Tx=%d H=%u S=%d", tx, call->acks_hard, call->state); | |
668 | ||
669 | if (hard > 0) { | |
670 | if (hard - 1 > tx) { | |
671 | _debug("hard-ACK'd packet %d not transmitted" | |
672 | " (%d top)", | |
673 | hard - 1, tx); | |
674 | goto protocol_error; | |
675 | } | |
676 | ||
677 | if ((call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY || | |
678 | call->state == RXRPC_CALL_SERVER_AWAIT_ACK) && | |
679 | hard > tx) | |
680 | goto all_acked; | |
681 | ||
682 | smp_rmb(); | |
683 | rxrpc_rotate_tx_window(call, hard - 1); | |
684 | } | |
685 | ||
686 | if (ack.nAcks > 0) { | |
687 | if (hard - 1 + ack.nAcks > tx) { | |
688 | _debug("soft-ACK'd packet %d+%d not" | |
689 | " transmitted (%d top)", | |
690 | hard - 1, ack.nAcks, tx); | |
691 | goto protocol_error; | |
692 | } | |
693 | ||
694 | if (rxrpc_process_soft_ACKs(call, &ack, skb) < 0) | |
695 | goto protocol_error; | |
696 | } | |
697 | goto discard; | |
698 | ||
699 | /* complete ACK to process */ | |
700 | case RXRPC_PACKET_TYPE_ACKALL: | |
701 | goto all_acked; | |
702 | ||
703 | /* abort and busy are handled elsewhere */ | |
704 | case RXRPC_PACKET_TYPE_BUSY: | |
705 | case RXRPC_PACKET_TYPE_ABORT: | |
706 | BUG(); | |
707 | ||
708 | /* connection level events - also handled elsewhere */ | |
709 | case RXRPC_PACKET_TYPE_CHALLENGE: | |
710 | case RXRPC_PACKET_TYPE_RESPONSE: | |
711 | case RXRPC_PACKET_TYPE_DEBUG: | |
712 | BUG(); | |
713 | } | |
714 | ||
715 | /* if we've had a hard ACK that covers all the packets we've sent, then | |
716 | * that ends that phase of the operation */ | |
717 | all_acked: | |
718 | write_lock_bh(&call->state_lock); | |
719 | _debug("ack all %d", call->state); | |
720 | ||
721 | switch (call->state) { | |
722 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
723 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
724 | break; | |
725 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
726 | _debug("srv complete"); | |
727 | call->state = RXRPC_CALL_COMPLETE; | |
728 | post_ACK = true; | |
729 | break; | |
730 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
731 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
732 | goto protocol_error_unlock; /* can't occur yet */ | |
733 | default: | |
734 | write_unlock_bh(&call->state_lock); | |
735 | goto discard; /* assume packet left over from earlier phase */ | |
736 | } | |
737 | ||
738 | write_unlock_bh(&call->state_lock); | |
739 | ||
740 | /* if all the packets we sent are hard-ACK'd, then we can discard | |
741 | * whatever we've got left */ | |
742 | _debug("clear Tx %d", | |
743 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
744 | ||
745 | del_timer_sync(&call->resend_timer); | |
746 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
747 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); | |
748 | ||
749 | if (call->acks_window) | |
750 | rxrpc_zap_tx_window(call); | |
751 | ||
752 | if (post_ACK) { | |
753 | /* post the final ACK message for userspace to pick up */ | |
754 | _debug("post ACK"); | |
755 | skb->mark = RXRPC_SKB_MARK_FINAL_ACK; | |
756 | sp->call = call; | |
757 | rxrpc_get_call(call); | |
758 | spin_lock_bh(&call->lock); | |
759 | if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0) | |
760 | BUG(); | |
761 | spin_unlock_bh(&call->lock); | |
762 | goto process_further; | |
763 | } | |
764 | ||
765 | discard: | |
766 | rxrpc_free_skb(skb); | |
767 | goto process_further; | |
768 | ||
769 | protocol_error_unlock: | |
770 | write_unlock_bh(&call->state_lock); | |
771 | protocol_error: | |
772 | rxrpc_free_skb(skb); | |
773 | _leave(" = -EPROTO"); | |
774 | return -EPROTO; | |
775 | } | |
776 | ||
777 | /* | |
778 | * post a message to the socket Rx queue for recvmsg() to pick up | |
779 | */ | |
780 | static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error, | |
781 | bool fatal) | |
782 | { | |
783 | struct rxrpc_skb_priv *sp; | |
784 | struct sk_buff *skb; | |
785 | int ret; | |
786 | ||
787 | _enter("{%d,%lx},%u,%u,%d", | |
788 | call->debug_id, call->flags, mark, error, fatal); | |
789 | ||
790 | /* remove timers and things for fatal messages */ | |
791 | if (fatal) { | |
792 | del_timer_sync(&call->resend_timer); | |
793 | del_timer_sync(&call->ack_timer); | |
794 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
795 | } | |
796 | ||
797 | if (mark != RXRPC_SKB_MARK_NEW_CALL && | |
798 | !test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
799 | _leave("[no userid]"); | |
800 | return 0; | |
801 | } | |
802 | ||
803 | if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { | |
804 | skb = alloc_skb(0, GFP_NOFS); | |
805 | if (!skb) | |
806 | return -ENOMEM; | |
807 | ||
808 | rxrpc_new_skb(skb); | |
809 | ||
810 | skb->mark = mark; | |
811 | ||
812 | sp = rxrpc_skb(skb); | |
813 | memset(sp, 0, sizeof(*sp)); | |
814 | sp->error = error; | |
815 | sp->call = call; | |
816 | rxrpc_get_call(call); | |
817 | ||
818 | spin_lock_bh(&call->lock); | |
819 | ret = rxrpc_queue_rcv_skb(call, skb, true, fatal); | |
820 | spin_unlock_bh(&call->lock); | |
163e3cb7 | 821 | BUG_ON(ret < 0); |
17926a79 DH |
822 | } |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
827 | /* | |
828 | * handle background processing of incoming call packets and ACK / abort | |
829 | * generation | |
830 | */ | |
831 | void rxrpc_process_call(struct work_struct *work) | |
832 | { | |
833 | struct rxrpc_call *call = | |
834 | container_of(work, struct rxrpc_call, processor); | |
835 | struct rxrpc_ackpacket ack; | |
836 | struct rxrpc_ackinfo ackinfo; | |
837 | struct rxrpc_header hdr; | |
838 | struct msghdr msg; | |
839 | struct kvec iov[5]; | |
840 | unsigned long bits; | |
224711df | 841 | __be32 data, pad; |
17926a79 | 842 | size_t len; |
224711df | 843 | int genbit, loop, nbit, ioc, ret, mtu; |
17926a79 DH |
844 | u32 abort_code = RX_PROTOCOL_ERROR; |
845 | u8 *acks = NULL; | |
846 | ||
847 | //printk("\n--------------------\n"); | |
848 | _enter("{%d,%s,%lx} [%lu]", | |
849 | call->debug_id, rxrpc_call_states[call->state], call->events, | |
850 | (jiffies - call->creation_jif) / (HZ / 10)); | |
851 | ||
852 | if (test_and_set_bit(RXRPC_CALL_PROC_BUSY, &call->flags)) { | |
853 | _debug("XXXXXXXXXXXXX RUNNING ON MULTIPLE CPUS XXXXXXXXXXXXX"); | |
854 | return; | |
855 | } | |
856 | ||
857 | /* there's a good chance we're going to have to send a message, so set | |
858 | * one up in advance */ | |
859 | msg.msg_name = &call->conn->trans->peer->srx.transport.sin; | |
860 | msg.msg_namelen = sizeof(call->conn->trans->peer->srx.transport.sin); | |
861 | msg.msg_control = NULL; | |
862 | msg.msg_controllen = 0; | |
863 | msg.msg_flags = 0; | |
864 | ||
865 | hdr.epoch = call->conn->epoch; | |
866 | hdr.cid = call->cid; | |
867 | hdr.callNumber = call->call_id; | |
868 | hdr.seq = 0; | |
869 | hdr.type = RXRPC_PACKET_TYPE_ACK; | |
870 | hdr.flags = call->conn->out_clientflag; | |
871 | hdr.userStatus = 0; | |
872 | hdr.securityIndex = call->conn->security_ix; | |
873 | hdr._rsvd = 0; | |
874 | hdr.serviceId = call->conn->service_id; | |
875 | ||
876 | memset(iov, 0, sizeof(iov)); | |
877 | iov[0].iov_base = &hdr; | |
878 | iov[0].iov_len = sizeof(hdr); | |
879 | ||
880 | /* deal with events of a final nature */ | |
881 | if (test_bit(RXRPC_CALL_RELEASE, &call->events)) { | |
882 | rxrpc_release_call(call); | |
883 | clear_bit(RXRPC_CALL_RELEASE, &call->events); | |
884 | } | |
885 | ||
886 | if (test_bit(RXRPC_CALL_RCVD_ERROR, &call->events)) { | |
887 | int error; | |
888 | ||
889 | clear_bit(RXRPC_CALL_CONN_ABORT, &call->events); | |
890 | clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events); | |
891 | clear_bit(RXRPC_CALL_ABORT, &call->events); | |
892 | ||
893 | error = call->conn->trans->peer->net_error; | |
894 | _debug("post net error %d", error); | |
895 | ||
896 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NET_ERROR, | |
897 | error, true) < 0) | |
898 | goto no_mem; | |
899 | clear_bit(RXRPC_CALL_RCVD_ERROR, &call->events); | |
900 | goto kill_ACKs; | |
901 | } | |
902 | ||
903 | if (test_bit(RXRPC_CALL_CONN_ABORT, &call->events)) { | |
904 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); | |
905 | ||
906 | clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events); | |
907 | clear_bit(RXRPC_CALL_ABORT, &call->events); | |
908 | ||
909 | _debug("post conn abort"); | |
910 | ||
911 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
912 | call->conn->error, true) < 0) | |
913 | goto no_mem; | |
914 | clear_bit(RXRPC_CALL_CONN_ABORT, &call->events); | |
915 | goto kill_ACKs; | |
916 | } | |
917 | ||
918 | if (test_bit(RXRPC_CALL_REJECT_BUSY, &call->events)) { | |
919 | hdr.type = RXRPC_PACKET_TYPE_BUSY; | |
920 | genbit = RXRPC_CALL_REJECT_BUSY; | |
921 | goto send_message; | |
922 | } | |
923 | ||
924 | if (test_bit(RXRPC_CALL_ABORT, &call->events)) { | |
925 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); | |
926 | ||
927 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
928 | ECONNABORTED, true) < 0) | |
929 | goto no_mem; | |
930 | hdr.type = RXRPC_PACKET_TYPE_ABORT; | |
931 | data = htonl(call->abort_code); | |
932 | iov[1].iov_base = &data; | |
933 | iov[1].iov_len = sizeof(data); | |
934 | genbit = RXRPC_CALL_ABORT; | |
935 | goto send_message; | |
936 | } | |
937 | ||
938 | if (test_bit(RXRPC_CALL_ACK_FINAL, &call->events)) { | |
17926a79 | 939 | genbit = RXRPC_CALL_ACK_FINAL; |
224711df DH |
940 | |
941 | ack.bufferSpace = htons(8); | |
942 | ack.maxSkew = 0; | |
943 | ack.serial = 0; | |
944 | ack.reason = RXRPC_ACK_IDLE; | |
945 | ack.nAcks = 0; | |
946 | call->ackr_reason = 0; | |
947 | ||
948 | spin_lock_bh(&call->lock); | |
949 | ack.serial = call->ackr_serial; | |
950 | ack.previousPacket = call->ackr_prev_seq; | |
951 | ack.firstPacket = htonl(call->rx_data_eaten + 1); | |
952 | spin_unlock_bh(&call->lock); | |
953 | ||
954 | pad = 0; | |
955 | ||
956 | iov[1].iov_base = &ack; | |
957 | iov[1].iov_len = sizeof(ack); | |
958 | iov[2].iov_base = &pad; | |
959 | iov[2].iov_len = 3; | |
960 | iov[3].iov_base = &ackinfo; | |
961 | iov[3].iov_len = sizeof(ackinfo); | |
962 | goto send_ACK; | |
17926a79 DH |
963 | } |
964 | ||
965 | if (call->events & ((1 << RXRPC_CALL_RCVD_BUSY) | | |
966 | (1 << RXRPC_CALL_RCVD_ABORT)) | |
967 | ) { | |
968 | u32 mark; | |
969 | ||
970 | if (test_bit(RXRPC_CALL_RCVD_ABORT, &call->events)) | |
971 | mark = RXRPC_SKB_MARK_REMOTE_ABORT; | |
972 | else | |
973 | mark = RXRPC_SKB_MARK_BUSY; | |
974 | ||
975 | _debug("post abort/busy"); | |
976 | rxrpc_clear_tx_window(call); | |
977 | if (rxrpc_post_message(call, mark, ECONNABORTED, true) < 0) | |
978 | goto no_mem; | |
979 | ||
980 | clear_bit(RXRPC_CALL_RCVD_BUSY, &call->events); | |
981 | clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events); | |
982 | goto kill_ACKs; | |
983 | } | |
984 | ||
985 | if (test_and_clear_bit(RXRPC_CALL_RCVD_ACKALL, &call->events)) { | |
986 | _debug("do implicit ackall"); | |
987 | rxrpc_clear_tx_window(call); | |
988 | } | |
989 | ||
990 | if (test_bit(RXRPC_CALL_LIFE_TIMER, &call->events)) { | |
991 | write_lock_bh(&call->state_lock); | |
992 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
993 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
994 | call->abort_code = RX_CALL_TIMEOUT; | |
995 | set_bit(RXRPC_CALL_ABORT, &call->events); | |
996 | } | |
997 | write_unlock_bh(&call->state_lock); | |
998 | ||
999 | _debug("post timeout"); | |
1000 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
1001 | ETIME, true) < 0) | |
1002 | goto no_mem; | |
1003 | ||
1004 | clear_bit(RXRPC_CALL_LIFE_TIMER, &call->events); | |
1005 | goto kill_ACKs; | |
1006 | } | |
1007 | ||
1008 | /* deal with assorted inbound messages */ | |
1009 | if (!skb_queue_empty(&call->rx_queue)) { | |
1010 | switch (rxrpc_process_rx_queue(call, &abort_code)) { | |
1011 | case 0: | |
1012 | case -EAGAIN: | |
1013 | break; | |
1014 | case -ENOMEM: | |
1015 | goto no_mem; | |
1016 | case -EKEYEXPIRED: | |
1017 | case -EKEYREJECTED: | |
1018 | case -EPROTO: | |
1019 | rxrpc_abort_call(call, abort_code); | |
1020 | goto kill_ACKs; | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | /* handle resending */ | |
1025 | if (test_and_clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events)) | |
1026 | rxrpc_resend_timer(call); | |
1027 | if (test_and_clear_bit(RXRPC_CALL_RESEND, &call->events)) | |
1028 | rxrpc_resend(call); | |
1029 | ||
1030 | /* consider sending an ordinary ACK */ | |
1031 | if (test_bit(RXRPC_CALL_ACK, &call->events)) { | |
17926a79 DH |
1032 | _debug("send ACK: window: %d - %d { %lx }", |
1033 | call->rx_data_eaten, call->ackr_win_top, | |
1034 | call->ackr_window[0]); | |
1035 | ||
1036 | if (call->state > RXRPC_CALL_SERVER_ACK_REQUEST && | |
1037 | call->ackr_reason != RXRPC_ACK_PING_RESPONSE) { | |
1038 | /* ACK by sending reply DATA packet in this state */ | |
1039 | clear_bit(RXRPC_CALL_ACK, &call->events); | |
1040 | goto maybe_reschedule; | |
1041 | } | |
1042 | ||
1043 | genbit = RXRPC_CALL_ACK; | |
1044 | ||
1045 | acks = kzalloc(call->ackr_win_top - call->rx_data_eaten, | |
1046 | GFP_NOFS); | |
1047 | if (!acks) | |
1048 | goto no_mem; | |
1049 | ||
1050 | //hdr.flags = RXRPC_SLOW_START_OK; | |
1051 | ack.bufferSpace = htons(8); | |
1052 | ack.maxSkew = 0; | |
1053 | ack.serial = 0; | |
1054 | ack.reason = 0; | |
1055 | ||
17926a79 DH |
1056 | spin_lock_bh(&call->lock); |
1057 | ack.reason = call->ackr_reason; | |
1058 | ack.serial = call->ackr_serial; | |
1059 | ack.previousPacket = call->ackr_prev_seq; | |
1060 | ack.firstPacket = htonl(call->rx_data_eaten + 1); | |
1061 | ||
1062 | ack.nAcks = 0; | |
1063 | for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) { | |
1064 | nbit = loop * BITS_PER_LONG; | |
1065 | for (bits = call->ackr_window[loop]; bits; bits >>= 1 | |
1066 | ) { | |
1067 | _debug("- l=%d n=%d b=%lx", loop, nbit, bits); | |
1068 | if (bits & 1) { | |
1069 | acks[nbit] = RXRPC_ACK_TYPE_ACK; | |
1070 | ack.nAcks = nbit + 1; | |
1071 | } | |
1072 | nbit++; | |
1073 | } | |
1074 | } | |
1075 | call->ackr_reason = 0; | |
1076 | spin_unlock_bh(&call->lock); | |
1077 | ||
1078 | pad = 0; | |
1079 | ||
1080 | iov[1].iov_base = &ack; | |
1081 | iov[1].iov_len = sizeof(ack); | |
1082 | iov[2].iov_base = acks; | |
1083 | iov[2].iov_len = ack.nAcks; | |
1084 | iov[3].iov_base = &pad; | |
1085 | iov[3].iov_len = 3; | |
1086 | iov[4].iov_base = &ackinfo; | |
1087 | iov[4].iov_len = sizeof(ackinfo); | |
1088 | ||
1089 | switch (ack.reason) { | |
1090 | case RXRPC_ACK_REQUESTED: | |
1091 | case RXRPC_ACK_DUPLICATE: | |
1092 | case RXRPC_ACK_OUT_OF_SEQUENCE: | |
1093 | case RXRPC_ACK_EXCEEDS_WINDOW: | |
1094 | case RXRPC_ACK_NOSPACE: | |
1095 | case RXRPC_ACK_PING: | |
1096 | case RXRPC_ACK_PING_RESPONSE: | |
1097 | goto send_ACK_with_skew; | |
1098 | case RXRPC_ACK_DELAY: | |
1099 | case RXRPC_ACK_IDLE: | |
1100 | goto send_ACK; | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | /* handle completion of security negotiations on an incoming | |
1105 | * connection */ | |
1106 | if (test_and_clear_bit(RXRPC_CALL_SECURED, &call->events)) { | |
1107 | _debug("secured"); | |
1108 | spin_lock_bh(&call->lock); | |
1109 | ||
1110 | if (call->state == RXRPC_CALL_SERVER_SECURING) { | |
1111 | _debug("securing"); | |
1112 | write_lock(&call->conn->lock); | |
1113 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
1114 | !test_bit(RXRPC_CALL_RELEASE, &call->events)) { | |
1115 | _debug("not released"); | |
1116 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
1117 | list_move_tail(&call->accept_link, | |
1118 | &call->socket->acceptq); | |
1119 | } | |
1120 | write_unlock(&call->conn->lock); | |
1121 | read_lock(&call->state_lock); | |
1122 | if (call->state < RXRPC_CALL_COMPLETE) | |
1123 | set_bit(RXRPC_CALL_POST_ACCEPT, &call->events); | |
1124 | read_unlock(&call->state_lock); | |
1125 | } | |
1126 | ||
1127 | spin_unlock_bh(&call->lock); | |
1128 | if (!test_bit(RXRPC_CALL_POST_ACCEPT, &call->events)) | |
1129 | goto maybe_reschedule; | |
1130 | } | |
1131 | ||
1132 | /* post a notification of an acceptable connection to the app */ | |
1133 | if (test_bit(RXRPC_CALL_POST_ACCEPT, &call->events)) { | |
1134 | _debug("post accept"); | |
1135 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NEW_CALL, | |
1136 | 0, false) < 0) | |
1137 | goto no_mem; | |
1138 | clear_bit(RXRPC_CALL_POST_ACCEPT, &call->events); | |
1139 | goto maybe_reschedule; | |
1140 | } | |
1141 | ||
1142 | /* handle incoming call acceptance */ | |
1143 | if (test_and_clear_bit(RXRPC_CALL_ACCEPTED, &call->events)) { | |
1144 | _debug("accepted"); | |
1145 | ASSERTCMP(call->rx_data_post, ==, 0); | |
1146 | call->rx_data_post = 1; | |
1147 | read_lock_bh(&call->state_lock); | |
1148 | if (call->state < RXRPC_CALL_COMPLETE) | |
1149 | set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events); | |
1150 | read_unlock_bh(&call->state_lock); | |
1151 | } | |
1152 | ||
1153 | /* drain the out of sequence received packet queue into the packet Rx | |
1154 | * queue */ | |
1155 | if (test_and_clear_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events)) { | |
1156 | while (call->rx_data_post == call->rx_first_oos) | |
1157 | if (rxrpc_drain_rx_oos_queue(call) < 0) | |
1158 | break; | |
1159 | goto maybe_reschedule; | |
1160 | } | |
1161 | ||
1162 | /* other events may have been raised since we started checking */ | |
1163 | goto maybe_reschedule; | |
1164 | ||
1165 | send_ACK_with_skew: | |
1166 | ack.maxSkew = htons(atomic_read(&call->conn->hi_serial) - | |
1167 | ntohl(ack.serial)); | |
1168 | send_ACK: | |
224711df DH |
1169 | mtu = call->conn->trans->peer->if_mtu; |
1170 | mtu -= call->conn->trans->peer->hdrsize; | |
1171 | ackinfo.maxMTU = htonl(mtu); | |
1172 | ackinfo.rwind = htonl(32); | |
1173 | ||
1174 | /* permit the peer to send us jumbo packets if it wants to */ | |
1175 | ackinfo.rxMTU = htonl(5692); | |
1176 | ackinfo.jumbo_max = htonl(4); | |
1177 | ||
17926a79 DH |
1178 | hdr.serial = htonl(atomic_inc_return(&call->conn->serial)); |
1179 | _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", | |
1180 | ntohl(hdr.serial), | |
1181 | ntohs(ack.maxSkew), | |
1182 | ntohl(ack.firstPacket), | |
1183 | ntohl(ack.previousPacket), | |
1184 | ntohl(ack.serial), | |
1185 | rxrpc_acks[ack.reason], | |
1186 | ack.nAcks); | |
1187 | ||
1188 | del_timer_sync(&call->ack_timer); | |
1189 | if (ack.nAcks > 0) | |
1190 | set_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags); | |
1191 | goto send_message_2; | |
1192 | ||
1193 | send_message: | |
1194 | _debug("send message"); | |
1195 | ||
1196 | hdr.serial = htonl(atomic_inc_return(&call->conn->serial)); | |
1197 | _proto("Tx %s %%%u", rxrpc_pkts[hdr.type], ntohl(hdr.serial)); | |
1198 | send_message_2: | |
1199 | ||
1200 | len = iov[0].iov_len; | |
1201 | ioc = 1; | |
1202 | if (iov[4].iov_len) { | |
1203 | ioc = 5; | |
1204 | len += iov[4].iov_len; | |
1205 | len += iov[3].iov_len; | |
1206 | len += iov[2].iov_len; | |
1207 | len += iov[1].iov_len; | |
1208 | } else if (iov[3].iov_len) { | |
1209 | ioc = 4; | |
1210 | len += iov[3].iov_len; | |
1211 | len += iov[2].iov_len; | |
1212 | len += iov[1].iov_len; | |
1213 | } else if (iov[2].iov_len) { | |
1214 | ioc = 3; | |
1215 | len += iov[2].iov_len; | |
1216 | len += iov[1].iov_len; | |
1217 | } else if (iov[1].iov_len) { | |
1218 | ioc = 2; | |
1219 | len += iov[1].iov_len; | |
1220 | } | |
1221 | ||
1222 | ret = kernel_sendmsg(call->conn->trans->local->socket, | |
1223 | &msg, iov, ioc, len); | |
1224 | if (ret < 0) { | |
1225 | _debug("sendmsg failed: %d", ret); | |
1226 | read_lock_bh(&call->state_lock); | |
1227 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1228 | rxrpc_queue_call(call); |
17926a79 DH |
1229 | read_unlock_bh(&call->state_lock); |
1230 | goto error; | |
1231 | } | |
1232 | ||
1233 | switch (genbit) { | |
1234 | case RXRPC_CALL_ABORT: | |
1235 | clear_bit(genbit, &call->events); | |
1236 | clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events); | |
1237 | goto kill_ACKs; | |
1238 | ||
1239 | case RXRPC_CALL_ACK_FINAL: | |
1240 | write_lock_bh(&call->state_lock); | |
1241 | if (call->state == RXRPC_CALL_CLIENT_FINAL_ACK) | |
1242 | call->state = RXRPC_CALL_COMPLETE; | |
1243 | write_unlock_bh(&call->state_lock); | |
1244 | goto kill_ACKs; | |
1245 | ||
1246 | default: | |
1247 | clear_bit(genbit, &call->events); | |
1248 | switch (call->state) { | |
1249 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
1250 | case RXRPC_CALL_CLIENT_RECV_REPLY: | |
1251 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
1252 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
1253 | _debug("start ACK timer"); | |
1254 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, | |
1255 | call->ackr_serial, false); | |
1256 | default: | |
1257 | break; | |
1258 | } | |
1259 | goto maybe_reschedule; | |
1260 | } | |
1261 | ||
1262 | kill_ACKs: | |
1263 | del_timer_sync(&call->ack_timer); | |
1264 | if (test_and_clear_bit(RXRPC_CALL_ACK_FINAL, &call->events)) | |
1265 | rxrpc_put_call(call); | |
1266 | clear_bit(RXRPC_CALL_ACK, &call->events); | |
1267 | ||
1268 | maybe_reschedule: | |
1269 | if (call->events || !skb_queue_empty(&call->rx_queue)) { | |
1270 | read_lock_bh(&call->state_lock); | |
1271 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1272 | rxrpc_queue_call(call); |
17926a79 DH |
1273 | read_unlock_bh(&call->state_lock); |
1274 | } | |
1275 | ||
1276 | /* don't leave aborted connections on the accept queue */ | |
1277 | if (call->state >= RXRPC_CALL_COMPLETE && | |
1278 | !list_empty(&call->accept_link)) { | |
1279 | _debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }", | |
1280 | call, call->events, call->flags, | |
1281 | ntohl(call->conn->cid)); | |
1282 | ||
1283 | read_lock_bh(&call->state_lock); | |
1284 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
1285 | !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) | |
651350d1 | 1286 | rxrpc_queue_call(call); |
17926a79 DH |
1287 | read_unlock_bh(&call->state_lock); |
1288 | } | |
1289 | ||
1290 | error: | |
1291 | clear_bit(RXRPC_CALL_PROC_BUSY, &call->flags); | |
1292 | kfree(acks); | |
1293 | ||
1294 | /* because we don't want two CPUs both processing the work item for one | |
1295 | * call at the same time, we use a flag to note when it's busy; however | |
1296 | * this means there's a race between clearing the flag and setting the | |
1297 | * work pending bit and the work item being processed again */ | |
1298 | if (call->events && !work_pending(&call->processor)) { | |
1299 | _debug("jumpstart %x", ntohl(call->conn->cid)); | |
651350d1 | 1300 | rxrpc_queue_call(call); |
17926a79 DH |
1301 | } |
1302 | ||
1303 | _leave(""); | |
1304 | return; | |
1305 | ||
1306 | no_mem: | |
1307 | _debug("out of memory"); | |
1308 | goto maybe_reschedule; | |
1309 | } |