Commit | Line | Data |
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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 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 DH |
14 | #include <linux/module.h> |
15 | #include <linux/circ_buf.h> | |
16 | #include <linux/net.h> | |
17 | #include <linux/skbuff.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
17926a79 DH |
19 | #include <linux/udp.h> |
20 | #include <net/sock.h> | |
21 | #include <net/af_rxrpc.h> | |
22 | #include "ar-internal.h" | |
23 | ||
17926a79 DH |
24 | /* |
25 | * propose an ACK be sent | |
26 | */ | |
4e36a95e | 27 | void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
0d12f8a4 | 28 | u32 serial, bool immediate) |
17926a79 DH |
29 | { |
30 | unsigned long expiry; | |
31 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
32 | ||
33 | ASSERTCMP(prior, >, 0); | |
34 | ||
35 | _enter("{%d},%s,%%%x,%u", | |
0d12f8a4 | 36 | call->debug_id, rxrpc_acks(ack_reason), serial, immediate); |
17926a79 DH |
37 | |
38 | if (prior < rxrpc_ack_priority[call->ackr_reason]) { | |
39 | if (immediate) | |
40 | goto cancel_timer; | |
41 | return; | |
42 | } | |
43 | ||
44 | /* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial | |
45 | * numbers */ | |
46 | if (prior == rxrpc_ack_priority[call->ackr_reason]) { | |
47 | if (prior <= 4) | |
48 | call->ackr_serial = serial; | |
49 | if (immediate) | |
50 | goto cancel_timer; | |
51 | return; | |
52 | } | |
53 | ||
54 | call->ackr_reason = ack_reason; | |
55 | call->ackr_serial = serial; | |
56 | ||
57 | switch (ack_reason) { | |
58 | case RXRPC_ACK_DELAY: | |
59 | _debug("run delay timer"); | |
5873c083 DH |
60 | expiry = rxrpc_soft_ack_delay; |
61 | goto run_timer; | |
17926a79 DH |
62 | |
63 | case RXRPC_ACK_IDLE: | |
64 | if (!immediate) { | |
65 | _debug("run defer timer"); | |
5873c083 | 66 | expiry = rxrpc_idle_ack_delay; |
17926a79 DH |
67 | goto run_timer; |
68 | } | |
69 | goto cancel_timer; | |
70 | ||
71 | case RXRPC_ACK_REQUESTED: | |
5873c083 DH |
72 | expiry = rxrpc_requested_ack_delay; |
73 | if (!expiry) | |
17926a79 | 74 | goto cancel_timer; |
0d12f8a4 | 75 | if (!immediate || serial == 1) { |
17926a79 | 76 | _debug("run defer timer"); |
17926a79 DH |
77 | goto run_timer; |
78 | } | |
79 | ||
80 | default: | |
81 | _debug("immediate ACK"); | |
82 | goto cancel_timer; | |
83 | } | |
84 | ||
85 | run_timer: | |
86 | expiry += jiffies; | |
87 | if (!timer_pending(&call->ack_timer) || | |
88 | time_after(call->ack_timer.expires, expiry)) | |
89 | mod_timer(&call->ack_timer, expiry); | |
90 | return; | |
91 | ||
92 | cancel_timer: | |
0d12f8a4 | 93 | _debug("cancel timer %%%u", serial); |
17926a79 DH |
94 | try_to_del_timer_sync(&call->ack_timer); |
95 | read_lock_bh(&call->state_lock); | |
96 | if (call->state <= RXRPC_CALL_COMPLETE && | |
4c198ad1 | 97 | !test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events)) |
651350d1 | 98 | rxrpc_queue_call(call); |
17926a79 DH |
99 | read_unlock_bh(&call->state_lock); |
100 | } | |
101 | ||
102 | /* | |
103 | * propose an ACK be sent, locking the call structure | |
104 | */ | |
4e36a95e | 105 | void rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
0d12f8a4 | 106 | u32 serial, bool immediate) |
17926a79 DH |
107 | { |
108 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
109 | ||
110 | if (prior > rxrpc_ack_priority[call->ackr_reason]) { | |
111 | spin_lock_bh(&call->lock); | |
112 | __rxrpc_propose_ACK(call, ack_reason, serial, immediate); | |
113 | spin_unlock_bh(&call->lock); | |
114 | } | |
115 | } | |
116 | ||
117 | /* | |
118 | * set the resend timer | |
119 | */ | |
120 | static void rxrpc_set_resend(struct rxrpc_call *call, u8 resend, | |
121 | unsigned long resend_at) | |
122 | { | |
123 | read_lock_bh(&call->state_lock); | |
124 | if (call->state >= RXRPC_CALL_COMPLETE) | |
125 | resend = 0; | |
126 | ||
127 | if (resend & 1) { | |
128 | _debug("SET RESEND"); | |
4c198ad1 | 129 | set_bit(RXRPC_CALL_EV_RESEND, &call->events); |
17926a79 DH |
130 | } |
131 | ||
132 | if (resend & 2) { | |
133 | _debug("MODIFY RESEND TIMER"); | |
134 | set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
135 | mod_timer(&call->resend_timer, resend_at); | |
136 | } else { | |
137 | _debug("KILL RESEND TIMER"); | |
138 | del_timer_sync(&call->resend_timer); | |
4c198ad1 | 139 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
17926a79 DH |
140 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
141 | } | |
142 | read_unlock_bh(&call->state_lock); | |
143 | } | |
144 | ||
145 | /* | |
146 | * resend packets | |
147 | */ | |
148 | static void rxrpc_resend(struct rxrpc_call *call) | |
149 | { | |
0d12f8a4 | 150 | struct rxrpc_wire_header *whdr; |
17926a79 | 151 | struct rxrpc_skb_priv *sp; |
17926a79 DH |
152 | struct sk_buff *txb; |
153 | unsigned long *p_txb, resend_at; | |
c03ae533 FW |
154 | bool stop; |
155 | int loop; | |
17926a79 DH |
156 | u8 resend; |
157 | ||
158 | _enter("{%d,%d,%d,%d},", | |
159 | call->acks_hard, call->acks_unacked, | |
160 | atomic_read(&call->sequence), | |
161 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
162 | ||
c03ae533 | 163 | stop = false; |
17926a79 DH |
164 | resend = 0; |
165 | resend_at = 0; | |
166 | ||
167 | for (loop = call->acks_tail; | |
168 | loop != call->acks_head || stop; | |
169 | loop = (loop + 1) & (call->acks_winsz - 1) | |
170 | ) { | |
171 | p_txb = call->acks_window + loop; | |
172 | smp_read_barrier_depends(); | |
173 | if (*p_txb & 1) | |
174 | continue; | |
175 | ||
176 | txb = (struct sk_buff *) *p_txb; | |
177 | sp = rxrpc_skb(txb); | |
178 | ||
179 | if (sp->need_resend) { | |
3db1cd5c | 180 | sp->need_resend = false; |
17926a79 DH |
181 | |
182 | /* each Tx packet has a new serial number */ | |
0d12f8a4 | 183 | sp->hdr.serial = atomic_inc_return(&call->conn->serial); |
17926a79 | 184 | |
0d12f8a4 DH |
185 | whdr = (struct rxrpc_wire_header *)txb->head; |
186 | whdr->serial = htonl(sp->hdr.serial); | |
17926a79 DH |
187 | |
188 | _proto("Tx DATA %%%u { #%d }", | |
0d12f8a4 | 189 | sp->hdr.serial, sp->hdr.seq); |
17926a79 | 190 | if (rxrpc_send_packet(call->conn->trans, txb) < 0) { |
c03ae533 | 191 | stop = true; |
17926a79 DH |
192 | sp->resend_at = jiffies + 3; |
193 | } else { | |
194 | sp->resend_at = | |
765dd3bb | 195 | jiffies + rxrpc_resend_timeout; |
17926a79 DH |
196 | } |
197 | } | |
198 | ||
199 | if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 200 | sp->need_resend = true; |
17926a79 DH |
201 | resend |= 1; |
202 | } else if (resend & 2) { | |
203 | if (time_before(sp->resend_at, resend_at)) | |
204 | resend_at = sp->resend_at; | |
205 | } else { | |
206 | resend_at = sp->resend_at; | |
207 | resend |= 2; | |
208 | } | |
209 | } | |
210 | ||
211 | rxrpc_set_resend(call, resend, resend_at); | |
212 | _leave(""); | |
213 | } | |
214 | ||
215 | /* | |
216 | * handle resend timer expiry | |
217 | */ | |
218 | static void rxrpc_resend_timer(struct rxrpc_call *call) | |
219 | { | |
220 | struct rxrpc_skb_priv *sp; | |
221 | struct sk_buff *txb; | |
222 | unsigned long *p_txb, resend_at; | |
223 | int loop; | |
224 | u8 resend; | |
225 | ||
226 | _enter("%d,%d,%d", | |
227 | call->acks_tail, call->acks_unacked, call->acks_head); | |
228 | ||
3b5bac2b DH |
229 | if (call->state >= RXRPC_CALL_COMPLETE) |
230 | return; | |
231 | ||
17926a79 DH |
232 | resend = 0; |
233 | resend_at = 0; | |
234 | ||
235 | for (loop = call->acks_unacked; | |
236 | loop != call->acks_head; | |
237 | loop = (loop + 1) & (call->acks_winsz - 1) | |
238 | ) { | |
239 | p_txb = call->acks_window + loop; | |
240 | smp_read_barrier_depends(); | |
241 | txb = (struct sk_buff *) (*p_txb & ~1); | |
242 | sp = rxrpc_skb(txb); | |
243 | ||
244 | ASSERT(!(*p_txb & 1)); | |
245 | ||
246 | if (sp->need_resend) { | |
247 | ; | |
248 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 249 | sp->need_resend = true; |
17926a79 DH |
250 | resend |= 1; |
251 | } else if (resend & 2) { | |
252 | if (time_before(sp->resend_at, resend_at)) | |
253 | resend_at = sp->resend_at; | |
254 | } else { | |
255 | resend_at = sp->resend_at; | |
256 | resend |= 2; | |
257 | } | |
258 | } | |
259 | ||
260 | rxrpc_set_resend(call, resend, resend_at); | |
261 | _leave(""); | |
262 | } | |
263 | ||
264 | /* | |
265 | * process soft ACKs of our transmitted packets | |
266 | * - these indicate packets the peer has or has not received, but hasn't yet | |
267 | * given to the consumer, and so can still be discarded and re-requested | |
268 | */ | |
269 | static int rxrpc_process_soft_ACKs(struct rxrpc_call *call, | |
270 | struct rxrpc_ackpacket *ack, | |
271 | struct sk_buff *skb) | |
272 | { | |
273 | struct rxrpc_skb_priv *sp; | |
274 | struct sk_buff *txb; | |
275 | unsigned long *p_txb, resend_at; | |
276 | int loop; | |
277 | u8 sacks[RXRPC_MAXACKS], resend; | |
278 | ||
279 | _enter("{%d,%d},{%d},", | |
280 | call->acks_hard, | |
281 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz), | |
282 | ack->nAcks); | |
283 | ||
284 | if (skb_copy_bits(skb, 0, sacks, ack->nAcks) < 0) | |
285 | goto protocol_error; | |
286 | ||
287 | resend = 0; | |
288 | resend_at = 0; | |
289 | for (loop = 0; loop < ack->nAcks; loop++) { | |
290 | p_txb = call->acks_window; | |
291 | p_txb += (call->acks_tail + loop) & (call->acks_winsz - 1); | |
292 | smp_read_barrier_depends(); | |
293 | txb = (struct sk_buff *) (*p_txb & ~1); | |
294 | sp = rxrpc_skb(txb); | |
295 | ||
296 | switch (sacks[loop]) { | |
297 | case RXRPC_ACK_TYPE_ACK: | |
3db1cd5c | 298 | sp->need_resend = false; |
17926a79 DH |
299 | *p_txb |= 1; |
300 | break; | |
301 | case RXRPC_ACK_TYPE_NACK: | |
3db1cd5c | 302 | sp->need_resend = true; |
17926a79 DH |
303 | *p_txb &= ~1; |
304 | resend = 1; | |
305 | break; | |
306 | default: | |
307 | _debug("Unsupported ACK type %d", sacks[loop]); | |
308 | goto protocol_error; | |
309 | } | |
310 | } | |
311 | ||
312 | smp_mb(); | |
313 | call->acks_unacked = (call->acks_tail + loop) & (call->acks_winsz - 1); | |
314 | ||
315 | /* anything not explicitly ACK'd is implicitly NACK'd, but may just not | |
316 | * have been received or processed yet by the far end */ | |
317 | for (loop = call->acks_unacked; | |
318 | loop != call->acks_head; | |
319 | loop = (loop + 1) & (call->acks_winsz - 1) | |
320 | ) { | |
321 | p_txb = call->acks_window + loop; | |
322 | smp_read_barrier_depends(); | |
323 | txb = (struct sk_buff *) (*p_txb & ~1); | |
324 | sp = rxrpc_skb(txb); | |
325 | ||
326 | if (*p_txb & 1) { | |
327 | /* packet must have been discarded */ | |
3db1cd5c | 328 | sp->need_resend = true; |
17926a79 DH |
329 | *p_txb &= ~1; |
330 | resend |= 1; | |
331 | } else if (sp->need_resend) { | |
332 | ; | |
333 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 334 | sp->need_resend = true; |
17926a79 DH |
335 | resend |= 1; |
336 | } else if (resend & 2) { | |
337 | if (time_before(sp->resend_at, resend_at)) | |
338 | resend_at = sp->resend_at; | |
339 | } else { | |
340 | resend_at = sp->resend_at; | |
341 | resend |= 2; | |
342 | } | |
343 | } | |
344 | ||
345 | rxrpc_set_resend(call, resend, resend_at); | |
346 | _leave(" = 0"); | |
347 | return 0; | |
348 | ||
349 | protocol_error: | |
350 | _leave(" = -EPROTO"); | |
351 | return -EPROTO; | |
352 | } | |
353 | ||
354 | /* | |
355 | * discard hard-ACK'd packets from the Tx window | |
356 | */ | |
357 | static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard) | |
358 | { | |
17926a79 DH |
359 | unsigned long _skb; |
360 | int tail = call->acks_tail, old_tail; | |
361 | int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz); | |
362 | ||
8f7e6e75 | 363 | _enter("{%u,%u},%u", call->acks_hard, win, hard); |
17926a79 DH |
364 | |
365 | ASSERTCMP(hard - call->acks_hard, <=, win); | |
366 | ||
367 | while (call->acks_hard < hard) { | |
368 | smp_read_barrier_depends(); | |
369 | _skb = call->acks_window[tail] & ~1; | |
17926a79 DH |
370 | rxrpc_free_skb((struct sk_buff *) _skb); |
371 | old_tail = tail; | |
372 | tail = (tail + 1) & (call->acks_winsz - 1); | |
373 | call->acks_tail = tail; | |
374 | if (call->acks_unacked == old_tail) | |
375 | call->acks_unacked = tail; | |
376 | call->acks_hard++; | |
377 | } | |
378 | ||
379 | wake_up(&call->tx_waitq); | |
380 | } | |
381 | ||
382 | /* | |
383 | * clear the Tx window in the event of a failure | |
384 | */ | |
385 | static void rxrpc_clear_tx_window(struct rxrpc_call *call) | |
386 | { | |
387 | rxrpc_rotate_tx_window(call, atomic_read(&call->sequence)); | |
388 | } | |
389 | ||
390 | /* | |
391 | * drain the out of sequence received packet queue into the packet Rx queue | |
392 | */ | |
393 | static int rxrpc_drain_rx_oos_queue(struct rxrpc_call *call) | |
394 | { | |
395 | struct rxrpc_skb_priv *sp; | |
396 | struct sk_buff *skb; | |
397 | bool terminal; | |
398 | int ret; | |
399 | ||
400 | _enter("{%d,%d}", call->rx_data_post, call->rx_first_oos); | |
401 | ||
402 | spin_lock_bh(&call->lock); | |
403 | ||
404 | ret = -ECONNRESET; | |
405 | if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
406 | goto socket_unavailable; | |
407 | ||
408 | skb = skb_dequeue(&call->rx_oos_queue); | |
409 | if (skb) { | |
410 | sp = rxrpc_skb(skb); | |
411 | ||
412 | _debug("drain OOS packet %d [%d]", | |
0d12f8a4 | 413 | sp->hdr.seq, call->rx_first_oos); |
17926a79 | 414 | |
0d12f8a4 | 415 | if (sp->hdr.seq != call->rx_first_oos) { |
17926a79 | 416 | skb_queue_head(&call->rx_oos_queue, skb); |
0d12f8a4 | 417 | call->rx_first_oos = rxrpc_skb(skb)->hdr.seq; |
17926a79 DH |
418 | _debug("requeue %p {%u}", skb, call->rx_first_oos); |
419 | } else { | |
420 | skb->mark = RXRPC_SKB_MARK_DATA; | |
421 | terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && | |
422 | !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); | |
423 | ret = rxrpc_queue_rcv_skb(call, skb, true, terminal); | |
424 | BUG_ON(ret < 0); | |
425 | _debug("drain #%u", call->rx_data_post); | |
426 | call->rx_data_post++; | |
427 | ||
428 | /* find out what the next packet is */ | |
429 | skb = skb_peek(&call->rx_oos_queue); | |
430 | if (skb) | |
0d12f8a4 | 431 | call->rx_first_oos = rxrpc_skb(skb)->hdr.seq; |
17926a79 DH |
432 | else |
433 | call->rx_first_oos = 0; | |
434 | _debug("peek %p {%u}", skb, call->rx_first_oos); | |
435 | } | |
436 | } | |
437 | ||
438 | ret = 0; | |
439 | socket_unavailable: | |
440 | spin_unlock_bh(&call->lock); | |
441 | _leave(" = %d", ret); | |
442 | return ret; | |
443 | } | |
444 | ||
445 | /* | |
446 | * insert an out of sequence packet into the buffer | |
447 | */ | |
448 | static void rxrpc_insert_oos_packet(struct rxrpc_call *call, | |
449 | struct sk_buff *skb) | |
450 | { | |
451 | struct rxrpc_skb_priv *sp, *psp; | |
452 | struct sk_buff *p; | |
453 | u32 seq; | |
454 | ||
455 | sp = rxrpc_skb(skb); | |
0d12f8a4 | 456 | seq = sp->hdr.seq; |
17926a79 DH |
457 | _enter(",,{%u}", seq); |
458 | ||
459 | skb->destructor = rxrpc_packet_destructor; | |
460 | ASSERTCMP(sp->call, ==, NULL); | |
461 | sp->call = call; | |
462 | rxrpc_get_call(call); | |
463 | ||
464 | /* insert into the buffer in sequence order */ | |
465 | spin_lock_bh(&call->lock); | |
466 | ||
467 | skb_queue_walk(&call->rx_oos_queue, p) { | |
468 | psp = rxrpc_skb(p); | |
0d12f8a4 DH |
469 | if (psp->hdr.seq > seq) { |
470 | _debug("insert oos #%u before #%u", seq, psp->hdr.seq); | |
17926a79 DH |
471 | skb_insert(p, skb, &call->rx_oos_queue); |
472 | goto inserted; | |
473 | } | |
474 | } | |
475 | ||
476 | _debug("append oos #%u", seq); | |
477 | skb_queue_tail(&call->rx_oos_queue, skb); | |
478 | inserted: | |
479 | ||
480 | /* we might now have a new front to the queue */ | |
481 | if (call->rx_first_oos == 0 || seq < call->rx_first_oos) | |
482 | call->rx_first_oos = seq; | |
483 | ||
484 | read_lock(&call->state_lock); | |
485 | if (call->state < RXRPC_CALL_COMPLETE && | |
486 | call->rx_data_post == call->rx_first_oos) { | |
487 | _debug("drain rx oos now"); | |
4c198ad1 | 488 | set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events); |
17926a79 DH |
489 | } |
490 | read_unlock(&call->state_lock); | |
491 | ||
492 | spin_unlock_bh(&call->lock); | |
493 | _leave(" [stored #%u]", call->rx_first_oos); | |
494 | } | |
495 | ||
496 | /* | |
497 | * clear the Tx window on final ACK reception | |
498 | */ | |
499 | static void rxrpc_zap_tx_window(struct rxrpc_call *call) | |
500 | { | |
501 | struct rxrpc_skb_priv *sp; | |
502 | struct sk_buff *skb; | |
503 | unsigned long _skb, *acks_window; | |
4e36a95e | 504 | u8 winsz = call->acks_winsz; |
17926a79 DH |
505 | int tail; |
506 | ||
507 | acks_window = call->acks_window; | |
508 | call->acks_window = NULL; | |
509 | ||
510 | while (CIRC_CNT(call->acks_head, call->acks_tail, winsz) > 0) { | |
511 | tail = call->acks_tail; | |
512 | smp_read_barrier_depends(); | |
513 | _skb = acks_window[tail] & ~1; | |
514 | smp_mb(); | |
515 | call->acks_tail = (call->acks_tail + 1) & (winsz - 1); | |
516 | ||
517 | skb = (struct sk_buff *) _skb; | |
518 | sp = rxrpc_skb(skb); | |
0d12f8a4 | 519 | _debug("+++ clear Tx %u", sp->hdr.seq); |
17926a79 DH |
520 | rxrpc_free_skb(skb); |
521 | } | |
522 | ||
523 | kfree(acks_window); | |
524 | } | |
525 | ||
224711df DH |
526 | /* |
527 | * process the extra information that may be appended to an ACK packet | |
528 | */ | |
529 | static void rxrpc_extract_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, | |
95c96174 | 530 | unsigned int latest, int nAcks) |
224711df DH |
531 | { |
532 | struct rxrpc_ackinfo ackinfo; | |
533 | struct rxrpc_peer *peer; | |
95c96174 | 534 | unsigned int mtu; |
224711df DH |
535 | |
536 | if (skb_copy_bits(skb, nAcks + 3, &ackinfo, sizeof(ackinfo)) < 0) { | |
537 | _leave(" [no ackinfo]"); | |
538 | return; | |
539 | } | |
540 | ||
541 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
542 | latest, | |
543 | ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU), | |
544 | ntohl(ackinfo.rwind), ntohl(ackinfo.jumbo_max)); | |
545 | ||
546 | mtu = min(ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU)); | |
547 | ||
548 | peer = call->conn->trans->peer; | |
549 | if (mtu < peer->maxdata) { | |
550 | spin_lock_bh(&peer->lock); | |
551 | peer->maxdata = mtu; | |
552 | peer->mtu = mtu + peer->hdrsize; | |
553 | spin_unlock_bh(&peer->lock); | |
554 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
555 | } | |
556 | } | |
557 | ||
17926a79 DH |
558 | /* |
559 | * process packets in the reception queue | |
560 | */ | |
561 | static int rxrpc_process_rx_queue(struct rxrpc_call *call, | |
562 | u32 *_abort_code) | |
563 | { | |
564 | struct rxrpc_ackpacket ack; | |
565 | struct rxrpc_skb_priv *sp; | |
566 | struct sk_buff *skb; | |
567 | bool post_ACK; | |
568 | int latest; | |
569 | u32 hard, tx; | |
570 | ||
571 | _enter(""); | |
572 | ||
573 | process_further: | |
574 | skb = skb_dequeue(&call->rx_queue); | |
575 | if (!skb) | |
576 | return -EAGAIN; | |
577 | ||
578 | _net("deferred skb %p", skb); | |
579 | ||
580 | sp = rxrpc_skb(skb); | |
581 | ||
582 | _debug("process %s [st %d]", rxrpc_pkts[sp->hdr.type], call->state); | |
583 | ||
584 | post_ACK = false; | |
585 | ||
586 | switch (sp->hdr.type) { | |
587 | /* data packets that wind up here have been received out of | |
588 | * order, need security processing or are jumbo packets */ | |
589 | case RXRPC_PACKET_TYPE_DATA: | |
0d12f8a4 | 590 | _proto("OOSQ DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq); |
17926a79 DH |
591 | |
592 | /* secured packets must be verified and possibly decrypted */ | |
e0e4d82f DH |
593 | if (call->conn->security->verify_packet(call, skb, |
594 | _abort_code) < 0) | |
17926a79 DH |
595 | goto protocol_error; |
596 | ||
597 | rxrpc_insert_oos_packet(call, skb); | |
598 | goto process_further; | |
599 | ||
600 | /* partial ACK to process */ | |
601 | case RXRPC_PACKET_TYPE_ACK: | |
602 | if (skb_copy_bits(skb, 0, &ack, sizeof(ack)) < 0) { | |
603 | _debug("extraction failure"); | |
604 | goto protocol_error; | |
605 | } | |
606 | if (!skb_pull(skb, sizeof(ack))) | |
607 | BUG(); | |
608 | ||
0d12f8a4 | 609 | latest = sp->hdr.serial; |
17926a79 DH |
610 | hard = ntohl(ack.firstPacket); |
611 | tx = atomic_read(&call->sequence); | |
612 | ||
613 | _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", | |
614 | latest, | |
615 | ntohs(ack.maxSkew), | |
616 | hard, | |
617 | ntohl(ack.previousPacket), | |
618 | ntohl(ack.serial), | |
08d4d217 | 619 | rxrpc_acks(ack.reason), |
17926a79 DH |
620 | ack.nAcks); |
621 | ||
224711df DH |
622 | rxrpc_extract_ackinfo(call, skb, latest, ack.nAcks); |
623 | ||
17926a79 DH |
624 | if (ack.reason == RXRPC_ACK_PING) { |
625 | _proto("Rx ACK %%%u PING Request", latest); | |
626 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, | |
627 | sp->hdr.serial, true); | |
628 | } | |
629 | ||
630 | /* discard any out-of-order or duplicate ACKs */ | |
631 | if (latest - call->acks_latest <= 0) { | |
632 | _debug("discard ACK %d <= %d", | |
633 | latest, call->acks_latest); | |
634 | goto discard; | |
635 | } | |
636 | call->acks_latest = latest; | |
637 | ||
638 | if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
639 | call->state != RXRPC_CALL_CLIENT_AWAIT_REPLY && | |
640 | call->state != RXRPC_CALL_SERVER_SEND_REPLY && | |
641 | call->state != RXRPC_CALL_SERVER_AWAIT_ACK) | |
642 | goto discard; | |
643 | ||
644 | _debug("Tx=%d H=%u S=%d", tx, call->acks_hard, call->state); | |
645 | ||
646 | if (hard > 0) { | |
647 | if (hard - 1 > tx) { | |
648 | _debug("hard-ACK'd packet %d not transmitted" | |
649 | " (%d top)", | |
650 | hard - 1, tx); | |
651 | goto protocol_error; | |
652 | } | |
653 | ||
654 | if ((call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY || | |
655 | call->state == RXRPC_CALL_SERVER_AWAIT_ACK) && | |
33c40e24 DH |
656 | hard > tx) { |
657 | call->acks_hard = tx; | |
17926a79 | 658 | goto all_acked; |
33c40e24 | 659 | } |
17926a79 DH |
660 | |
661 | smp_rmb(); | |
662 | rxrpc_rotate_tx_window(call, hard - 1); | |
663 | } | |
664 | ||
665 | if (ack.nAcks > 0) { | |
666 | if (hard - 1 + ack.nAcks > tx) { | |
667 | _debug("soft-ACK'd packet %d+%d not" | |
668 | " transmitted (%d top)", | |
669 | hard - 1, ack.nAcks, tx); | |
670 | goto protocol_error; | |
671 | } | |
672 | ||
673 | if (rxrpc_process_soft_ACKs(call, &ack, skb) < 0) | |
674 | goto protocol_error; | |
675 | } | |
676 | goto discard; | |
677 | ||
678 | /* complete ACK to process */ | |
679 | case RXRPC_PACKET_TYPE_ACKALL: | |
680 | goto all_acked; | |
681 | ||
682 | /* abort and busy are handled elsewhere */ | |
683 | case RXRPC_PACKET_TYPE_BUSY: | |
684 | case RXRPC_PACKET_TYPE_ABORT: | |
685 | BUG(); | |
686 | ||
687 | /* connection level events - also handled elsewhere */ | |
688 | case RXRPC_PACKET_TYPE_CHALLENGE: | |
689 | case RXRPC_PACKET_TYPE_RESPONSE: | |
690 | case RXRPC_PACKET_TYPE_DEBUG: | |
691 | BUG(); | |
692 | } | |
693 | ||
694 | /* if we've had a hard ACK that covers all the packets we've sent, then | |
695 | * that ends that phase of the operation */ | |
696 | all_acked: | |
697 | write_lock_bh(&call->state_lock); | |
698 | _debug("ack all %d", call->state); | |
699 | ||
700 | switch (call->state) { | |
701 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
702 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
703 | break; | |
704 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
705 | _debug("srv complete"); | |
706 | call->state = RXRPC_CALL_COMPLETE; | |
707 | post_ACK = true; | |
708 | break; | |
709 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
710 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
711 | goto protocol_error_unlock; /* can't occur yet */ | |
712 | default: | |
713 | write_unlock_bh(&call->state_lock); | |
714 | goto discard; /* assume packet left over from earlier phase */ | |
715 | } | |
716 | ||
717 | write_unlock_bh(&call->state_lock); | |
718 | ||
719 | /* if all the packets we sent are hard-ACK'd, then we can discard | |
720 | * whatever we've got left */ | |
721 | _debug("clear Tx %d", | |
722 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
723 | ||
724 | del_timer_sync(&call->resend_timer); | |
725 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
4c198ad1 | 726 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
17926a79 DH |
727 | |
728 | if (call->acks_window) | |
729 | rxrpc_zap_tx_window(call); | |
730 | ||
731 | if (post_ACK) { | |
732 | /* post the final ACK message for userspace to pick up */ | |
733 | _debug("post ACK"); | |
734 | skb->mark = RXRPC_SKB_MARK_FINAL_ACK; | |
735 | sp->call = call; | |
736 | rxrpc_get_call(call); | |
737 | spin_lock_bh(&call->lock); | |
738 | if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0) | |
739 | BUG(); | |
740 | spin_unlock_bh(&call->lock); | |
741 | goto process_further; | |
742 | } | |
743 | ||
744 | discard: | |
745 | rxrpc_free_skb(skb); | |
746 | goto process_further; | |
747 | ||
748 | protocol_error_unlock: | |
749 | write_unlock_bh(&call->state_lock); | |
750 | protocol_error: | |
751 | rxrpc_free_skb(skb); | |
752 | _leave(" = -EPROTO"); | |
753 | return -EPROTO; | |
754 | } | |
755 | ||
756 | /* | |
757 | * post a message to the socket Rx queue for recvmsg() to pick up | |
758 | */ | |
759 | static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error, | |
760 | bool fatal) | |
761 | { | |
762 | struct rxrpc_skb_priv *sp; | |
763 | struct sk_buff *skb; | |
764 | int ret; | |
765 | ||
766 | _enter("{%d,%lx},%u,%u,%d", | |
767 | call->debug_id, call->flags, mark, error, fatal); | |
768 | ||
769 | /* remove timers and things for fatal messages */ | |
770 | if (fatal) { | |
771 | del_timer_sync(&call->resend_timer); | |
772 | del_timer_sync(&call->ack_timer); | |
773 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
774 | } | |
775 | ||
776 | if (mark != RXRPC_SKB_MARK_NEW_CALL && | |
777 | !test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
778 | _leave("[no userid]"); | |
779 | return 0; | |
780 | } | |
781 | ||
782 | if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { | |
783 | skb = alloc_skb(0, GFP_NOFS); | |
784 | if (!skb) | |
785 | return -ENOMEM; | |
786 | ||
787 | rxrpc_new_skb(skb); | |
788 | ||
789 | skb->mark = mark; | |
790 | ||
791 | sp = rxrpc_skb(skb); | |
792 | memset(sp, 0, sizeof(*sp)); | |
793 | sp->error = error; | |
794 | sp->call = call; | |
795 | rxrpc_get_call(call); | |
796 | ||
797 | spin_lock_bh(&call->lock); | |
798 | ret = rxrpc_queue_rcv_skb(call, skb, true, fatal); | |
799 | spin_unlock_bh(&call->lock); | |
163e3cb7 | 800 | BUG_ON(ret < 0); |
17926a79 DH |
801 | } |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
806 | /* | |
807 | * handle background processing of incoming call packets and ACK / abort | |
808 | * generation | |
809 | */ | |
810 | void rxrpc_process_call(struct work_struct *work) | |
811 | { | |
812 | struct rxrpc_call *call = | |
813 | container_of(work, struct rxrpc_call, processor); | |
0d12f8a4 | 814 | struct rxrpc_wire_header whdr; |
17926a79 DH |
815 | struct rxrpc_ackpacket ack; |
816 | struct rxrpc_ackinfo ackinfo; | |
17926a79 DH |
817 | struct msghdr msg; |
818 | struct kvec iov[5]; | |
5b8848d1 | 819 | enum rxrpc_call_event genbit; |
17926a79 | 820 | unsigned long bits; |
224711df | 821 | __be32 data, pad; |
17926a79 | 822 | size_t len; |
5b8848d1 | 823 | int loop, nbit, ioc, ret, mtu; |
0d12f8a4 | 824 | u32 serial, abort_code = RX_PROTOCOL_ERROR; |
17926a79 DH |
825 | u8 *acks = NULL; |
826 | ||
827 | //printk("\n--------------------\n"); | |
828 | _enter("{%d,%s,%lx} [%lu]", | |
829 | call->debug_id, rxrpc_call_states[call->state], call->events, | |
830 | (jiffies - call->creation_jif) / (HZ / 10)); | |
831 | ||
832 | if (test_and_set_bit(RXRPC_CALL_PROC_BUSY, &call->flags)) { | |
833 | _debug("XXXXXXXXXXXXX RUNNING ON MULTIPLE CPUS XXXXXXXXXXXXX"); | |
834 | return; | |
835 | } | |
836 | ||
837 | /* there's a good chance we're going to have to send a message, so set | |
838 | * one up in advance */ | |
6dd050f8 DH |
839 | msg.msg_name = &call->conn->trans->peer->srx.transport; |
840 | msg.msg_namelen = call->conn->trans->peer->srx.transport_len; | |
17926a79 DH |
841 | msg.msg_control = NULL; |
842 | msg.msg_controllen = 0; | |
843 | msg.msg_flags = 0; | |
844 | ||
0d12f8a4 DH |
845 | whdr.epoch = htonl(call->conn->epoch); |
846 | whdr.cid = htonl(call->cid); | |
847 | whdr.callNumber = htonl(call->call_id); | |
848 | whdr.seq = 0; | |
849 | whdr.type = RXRPC_PACKET_TYPE_ACK; | |
850 | whdr.flags = call->conn->out_clientflag; | |
851 | whdr.userStatus = 0; | |
852 | whdr.securityIndex = call->conn->security_ix; | |
853 | whdr._rsvd = 0; | |
854 | whdr.serviceId = htons(call->service_id); | |
17926a79 DH |
855 | |
856 | memset(iov, 0, sizeof(iov)); | |
0d12f8a4 DH |
857 | iov[0].iov_base = &whdr; |
858 | iov[0].iov_len = sizeof(whdr); | |
17926a79 DH |
859 | |
860 | /* deal with events of a final nature */ | |
4c198ad1 | 861 | if (test_bit(RXRPC_CALL_EV_RELEASE, &call->events)) { |
17926a79 | 862 | rxrpc_release_call(call); |
4c198ad1 | 863 | clear_bit(RXRPC_CALL_EV_RELEASE, &call->events); |
17926a79 DH |
864 | } |
865 | ||
4c198ad1 | 866 | if (test_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events)) { |
17926a79 DH |
867 | int error; |
868 | ||
4c198ad1 DH |
869 | clear_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events); |
870 | clear_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events); | |
871 | clear_bit(RXRPC_CALL_EV_ABORT, &call->events); | |
17926a79 DH |
872 | |
873 | error = call->conn->trans->peer->net_error; | |
874 | _debug("post net error %d", error); | |
875 | ||
876 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NET_ERROR, | |
877 | error, true) < 0) | |
878 | goto no_mem; | |
4c198ad1 | 879 | clear_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events); |
17926a79 DH |
880 | goto kill_ACKs; |
881 | } | |
882 | ||
4c198ad1 | 883 | if (test_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events)) { |
17926a79 DH |
884 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); |
885 | ||
4c198ad1 DH |
886 | clear_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events); |
887 | clear_bit(RXRPC_CALL_EV_ABORT, &call->events); | |
17926a79 DH |
888 | |
889 | _debug("post conn abort"); | |
890 | ||
891 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
892 | call->conn->error, true) < 0) | |
893 | goto no_mem; | |
4c198ad1 | 894 | clear_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events); |
17926a79 DH |
895 | goto kill_ACKs; |
896 | } | |
897 | ||
4c198ad1 | 898 | if (test_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events)) { |
0d12f8a4 | 899 | whdr.type = RXRPC_PACKET_TYPE_BUSY; |
4c198ad1 | 900 | genbit = RXRPC_CALL_EV_REJECT_BUSY; |
17926a79 DH |
901 | goto send_message; |
902 | } | |
903 | ||
4c198ad1 | 904 | if (test_bit(RXRPC_CALL_EV_ABORT, &call->events)) { |
17926a79 DH |
905 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); |
906 | ||
907 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
908 | ECONNABORTED, true) < 0) | |
909 | goto no_mem; | |
0d12f8a4 | 910 | whdr.type = RXRPC_PACKET_TYPE_ABORT; |
dc44b3a0 | 911 | data = htonl(call->local_abort); |
17926a79 DH |
912 | iov[1].iov_base = &data; |
913 | iov[1].iov_len = sizeof(data); | |
4c198ad1 | 914 | genbit = RXRPC_CALL_EV_ABORT; |
17926a79 DH |
915 | goto send_message; |
916 | } | |
917 | ||
4c198ad1 DH |
918 | if (test_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events)) { |
919 | genbit = RXRPC_CALL_EV_ACK_FINAL; | |
224711df DH |
920 | |
921 | ack.bufferSpace = htons(8); | |
922 | ack.maxSkew = 0; | |
923 | ack.serial = 0; | |
924 | ack.reason = RXRPC_ACK_IDLE; | |
925 | ack.nAcks = 0; | |
926 | call->ackr_reason = 0; | |
927 | ||
928 | spin_lock_bh(&call->lock); | |
0d12f8a4 DH |
929 | ack.serial = htonl(call->ackr_serial); |
930 | ack.previousPacket = htonl(call->ackr_prev_seq); | |
931 | ack.firstPacket = htonl(call->rx_data_eaten + 1); | |
224711df DH |
932 | spin_unlock_bh(&call->lock); |
933 | ||
934 | pad = 0; | |
935 | ||
936 | iov[1].iov_base = &ack; | |
937 | iov[1].iov_len = sizeof(ack); | |
938 | iov[2].iov_base = &pad; | |
939 | iov[2].iov_len = 3; | |
940 | iov[3].iov_base = &ackinfo; | |
941 | iov[3].iov_len = sizeof(ackinfo); | |
942 | goto send_ACK; | |
17926a79 DH |
943 | } |
944 | ||
4c198ad1 DH |
945 | if (call->events & ((1 << RXRPC_CALL_EV_RCVD_BUSY) | |
946 | (1 << RXRPC_CALL_EV_RCVD_ABORT)) | |
17926a79 DH |
947 | ) { |
948 | u32 mark; | |
949 | ||
4c198ad1 | 950 | if (test_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events)) |
17926a79 DH |
951 | mark = RXRPC_SKB_MARK_REMOTE_ABORT; |
952 | else | |
953 | mark = RXRPC_SKB_MARK_BUSY; | |
954 | ||
955 | _debug("post abort/busy"); | |
956 | rxrpc_clear_tx_window(call); | |
957 | if (rxrpc_post_message(call, mark, ECONNABORTED, true) < 0) | |
958 | goto no_mem; | |
959 | ||
4c198ad1 DH |
960 | clear_bit(RXRPC_CALL_EV_RCVD_BUSY, &call->events); |
961 | clear_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); | |
17926a79 DH |
962 | goto kill_ACKs; |
963 | } | |
964 | ||
4c198ad1 | 965 | if (test_and_clear_bit(RXRPC_CALL_EV_RCVD_ACKALL, &call->events)) { |
17926a79 DH |
966 | _debug("do implicit ackall"); |
967 | rxrpc_clear_tx_window(call); | |
968 | } | |
969 | ||
4c198ad1 | 970 | if (test_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events)) { |
17926a79 DH |
971 | write_lock_bh(&call->state_lock); |
972 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
973 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
dc44b3a0 | 974 | call->local_abort = RX_CALL_TIMEOUT; |
4c198ad1 | 975 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
17926a79 DH |
976 | } |
977 | write_unlock_bh(&call->state_lock); | |
978 | ||
979 | _debug("post timeout"); | |
980 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
981 | ETIME, true) < 0) | |
982 | goto no_mem; | |
983 | ||
4c198ad1 | 984 | clear_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events); |
17926a79 DH |
985 | goto kill_ACKs; |
986 | } | |
987 | ||
988 | /* deal with assorted inbound messages */ | |
989 | if (!skb_queue_empty(&call->rx_queue)) { | |
990 | switch (rxrpc_process_rx_queue(call, &abort_code)) { | |
991 | case 0: | |
992 | case -EAGAIN: | |
993 | break; | |
994 | case -ENOMEM: | |
995 | goto no_mem; | |
996 | case -EKEYEXPIRED: | |
997 | case -EKEYREJECTED: | |
998 | case -EPROTO: | |
999 | rxrpc_abort_call(call, abort_code); | |
1000 | goto kill_ACKs; | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | /* handle resending */ | |
4c198ad1 | 1005 | if (test_and_clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events)) |
17926a79 | 1006 | rxrpc_resend_timer(call); |
4c198ad1 | 1007 | if (test_and_clear_bit(RXRPC_CALL_EV_RESEND, &call->events)) |
17926a79 DH |
1008 | rxrpc_resend(call); |
1009 | ||
1010 | /* consider sending an ordinary ACK */ | |
4c198ad1 | 1011 | if (test_bit(RXRPC_CALL_EV_ACK, &call->events)) { |
17926a79 DH |
1012 | _debug("send ACK: window: %d - %d { %lx }", |
1013 | call->rx_data_eaten, call->ackr_win_top, | |
1014 | call->ackr_window[0]); | |
1015 | ||
1016 | if (call->state > RXRPC_CALL_SERVER_ACK_REQUEST && | |
1017 | call->ackr_reason != RXRPC_ACK_PING_RESPONSE) { | |
1018 | /* ACK by sending reply DATA packet in this state */ | |
4c198ad1 | 1019 | clear_bit(RXRPC_CALL_EV_ACK, &call->events); |
17926a79 DH |
1020 | goto maybe_reschedule; |
1021 | } | |
1022 | ||
4c198ad1 | 1023 | genbit = RXRPC_CALL_EV_ACK; |
17926a79 DH |
1024 | |
1025 | acks = kzalloc(call->ackr_win_top - call->rx_data_eaten, | |
1026 | GFP_NOFS); | |
1027 | if (!acks) | |
1028 | goto no_mem; | |
1029 | ||
1030 | //hdr.flags = RXRPC_SLOW_START_OK; | |
1031 | ack.bufferSpace = htons(8); | |
1032 | ack.maxSkew = 0; | |
17926a79 | 1033 | |
17926a79 | 1034 | spin_lock_bh(&call->lock); |
0d12f8a4 DH |
1035 | ack.reason = call->ackr_reason; |
1036 | ack.serial = htonl(call->ackr_serial); | |
1037 | ack.previousPacket = htonl(call->ackr_prev_seq); | |
17926a79 DH |
1038 | ack.firstPacket = htonl(call->rx_data_eaten + 1); |
1039 | ||
1040 | ack.nAcks = 0; | |
1041 | for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) { | |
1042 | nbit = loop * BITS_PER_LONG; | |
1043 | for (bits = call->ackr_window[loop]; bits; bits >>= 1 | |
1044 | ) { | |
1045 | _debug("- l=%d n=%d b=%lx", loop, nbit, bits); | |
1046 | if (bits & 1) { | |
1047 | acks[nbit] = RXRPC_ACK_TYPE_ACK; | |
1048 | ack.nAcks = nbit + 1; | |
1049 | } | |
1050 | nbit++; | |
1051 | } | |
1052 | } | |
1053 | call->ackr_reason = 0; | |
1054 | spin_unlock_bh(&call->lock); | |
1055 | ||
1056 | pad = 0; | |
1057 | ||
1058 | iov[1].iov_base = &ack; | |
1059 | iov[1].iov_len = sizeof(ack); | |
1060 | iov[2].iov_base = acks; | |
1061 | iov[2].iov_len = ack.nAcks; | |
1062 | iov[3].iov_base = &pad; | |
1063 | iov[3].iov_len = 3; | |
1064 | iov[4].iov_base = &ackinfo; | |
1065 | iov[4].iov_len = sizeof(ackinfo); | |
1066 | ||
1067 | switch (ack.reason) { | |
1068 | case RXRPC_ACK_REQUESTED: | |
1069 | case RXRPC_ACK_DUPLICATE: | |
1070 | case RXRPC_ACK_OUT_OF_SEQUENCE: | |
1071 | case RXRPC_ACK_EXCEEDS_WINDOW: | |
1072 | case RXRPC_ACK_NOSPACE: | |
1073 | case RXRPC_ACK_PING: | |
1074 | case RXRPC_ACK_PING_RESPONSE: | |
1075 | goto send_ACK_with_skew; | |
1076 | case RXRPC_ACK_DELAY: | |
1077 | case RXRPC_ACK_IDLE: | |
1078 | goto send_ACK; | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | /* handle completion of security negotiations on an incoming | |
1083 | * connection */ | |
4c198ad1 | 1084 | if (test_and_clear_bit(RXRPC_CALL_EV_SECURED, &call->events)) { |
17926a79 DH |
1085 | _debug("secured"); |
1086 | spin_lock_bh(&call->lock); | |
1087 | ||
1088 | if (call->state == RXRPC_CALL_SERVER_SECURING) { | |
1089 | _debug("securing"); | |
1090 | write_lock(&call->conn->lock); | |
1091 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
4c198ad1 | 1092 | !test_bit(RXRPC_CALL_EV_RELEASE, &call->events)) { |
17926a79 DH |
1093 | _debug("not released"); |
1094 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
1095 | list_move_tail(&call->accept_link, | |
1096 | &call->socket->acceptq); | |
1097 | } | |
1098 | write_unlock(&call->conn->lock); | |
1099 | read_lock(&call->state_lock); | |
1100 | if (call->state < RXRPC_CALL_COMPLETE) | |
4c198ad1 | 1101 | set_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events); |
17926a79 DH |
1102 | read_unlock(&call->state_lock); |
1103 | } | |
1104 | ||
1105 | spin_unlock_bh(&call->lock); | |
4c198ad1 | 1106 | if (!test_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events)) |
17926a79 DH |
1107 | goto maybe_reschedule; |
1108 | } | |
1109 | ||
1110 | /* post a notification of an acceptable connection to the app */ | |
4c198ad1 | 1111 | if (test_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events)) { |
17926a79 DH |
1112 | _debug("post accept"); |
1113 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NEW_CALL, | |
1114 | 0, false) < 0) | |
1115 | goto no_mem; | |
4c198ad1 | 1116 | clear_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events); |
17926a79 DH |
1117 | goto maybe_reschedule; |
1118 | } | |
1119 | ||
1120 | /* handle incoming call acceptance */ | |
4c198ad1 | 1121 | if (test_and_clear_bit(RXRPC_CALL_EV_ACCEPTED, &call->events)) { |
17926a79 DH |
1122 | _debug("accepted"); |
1123 | ASSERTCMP(call->rx_data_post, ==, 0); | |
1124 | call->rx_data_post = 1; | |
1125 | read_lock_bh(&call->state_lock); | |
1126 | if (call->state < RXRPC_CALL_COMPLETE) | |
4c198ad1 | 1127 | set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events); |
17926a79 DH |
1128 | read_unlock_bh(&call->state_lock); |
1129 | } | |
1130 | ||
1131 | /* drain the out of sequence received packet queue into the packet Rx | |
1132 | * queue */ | |
4c198ad1 | 1133 | if (test_and_clear_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events)) { |
17926a79 DH |
1134 | while (call->rx_data_post == call->rx_first_oos) |
1135 | if (rxrpc_drain_rx_oos_queue(call) < 0) | |
1136 | break; | |
1137 | goto maybe_reschedule; | |
1138 | } | |
1139 | ||
1140 | /* other events may have been raised since we started checking */ | |
1141 | goto maybe_reschedule; | |
1142 | ||
1143 | send_ACK_with_skew: | |
1144 | ack.maxSkew = htons(atomic_read(&call->conn->hi_serial) - | |
1145 | ntohl(ack.serial)); | |
1146 | send_ACK: | |
224711df DH |
1147 | mtu = call->conn->trans->peer->if_mtu; |
1148 | mtu -= call->conn->trans->peer->hdrsize; | |
1149 | ackinfo.maxMTU = htonl(mtu); | |
817913d8 | 1150 | ackinfo.rwind = htonl(rxrpc_rx_window_size); |
224711df DH |
1151 | |
1152 | /* permit the peer to send us jumbo packets if it wants to */ | |
817913d8 DH |
1153 | ackinfo.rxMTU = htonl(rxrpc_rx_mtu); |
1154 | ackinfo.jumbo_max = htonl(rxrpc_rx_jumbo_max); | |
224711df | 1155 | |
0d12f8a4 DH |
1156 | serial = atomic_inc_return(&call->conn->serial); |
1157 | whdr.serial = htonl(serial); | |
17926a79 | 1158 | _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", |
0d12f8a4 | 1159 | serial, |
17926a79 DH |
1160 | ntohs(ack.maxSkew), |
1161 | ntohl(ack.firstPacket), | |
1162 | ntohl(ack.previousPacket), | |
1163 | ntohl(ack.serial), | |
08d4d217 | 1164 | rxrpc_acks(ack.reason), |
17926a79 DH |
1165 | ack.nAcks); |
1166 | ||
1167 | del_timer_sync(&call->ack_timer); | |
1168 | if (ack.nAcks > 0) | |
1169 | set_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags); | |
1170 | goto send_message_2; | |
1171 | ||
1172 | send_message: | |
1173 | _debug("send message"); | |
1174 | ||
0d12f8a4 DH |
1175 | serial = atomic_inc_return(&call->conn->serial); |
1176 | whdr.serial = htonl(serial); | |
1177 | _proto("Tx %s %%%u", rxrpc_pkts[whdr.type], serial); | |
17926a79 DH |
1178 | send_message_2: |
1179 | ||
1180 | len = iov[0].iov_len; | |
1181 | ioc = 1; | |
1182 | if (iov[4].iov_len) { | |
1183 | ioc = 5; | |
1184 | len += iov[4].iov_len; | |
1185 | len += iov[3].iov_len; | |
1186 | len += iov[2].iov_len; | |
1187 | len += iov[1].iov_len; | |
1188 | } else if (iov[3].iov_len) { | |
1189 | ioc = 4; | |
1190 | len += iov[3].iov_len; | |
1191 | len += iov[2].iov_len; | |
1192 | len += iov[1].iov_len; | |
1193 | } else if (iov[2].iov_len) { | |
1194 | ioc = 3; | |
1195 | len += iov[2].iov_len; | |
1196 | len += iov[1].iov_len; | |
1197 | } else if (iov[1].iov_len) { | |
1198 | ioc = 2; | |
1199 | len += iov[1].iov_len; | |
1200 | } | |
1201 | ||
1202 | ret = kernel_sendmsg(call->conn->trans->local->socket, | |
1203 | &msg, iov, ioc, len); | |
1204 | if (ret < 0) { | |
1205 | _debug("sendmsg failed: %d", ret); | |
1206 | read_lock_bh(&call->state_lock); | |
1207 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1208 | rxrpc_queue_call(call); |
17926a79 DH |
1209 | read_unlock_bh(&call->state_lock); |
1210 | goto error; | |
1211 | } | |
1212 | ||
1213 | switch (genbit) { | |
4c198ad1 | 1214 | case RXRPC_CALL_EV_ABORT: |
17926a79 | 1215 | clear_bit(genbit, &call->events); |
4c198ad1 | 1216 | clear_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); |
17926a79 DH |
1217 | goto kill_ACKs; |
1218 | ||
4c198ad1 | 1219 | case RXRPC_CALL_EV_ACK_FINAL: |
17926a79 DH |
1220 | write_lock_bh(&call->state_lock); |
1221 | if (call->state == RXRPC_CALL_CLIENT_FINAL_ACK) | |
1222 | call->state = RXRPC_CALL_COMPLETE; | |
1223 | write_unlock_bh(&call->state_lock); | |
1224 | goto kill_ACKs; | |
1225 | ||
1226 | default: | |
1227 | clear_bit(genbit, &call->events); | |
1228 | switch (call->state) { | |
1229 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
1230 | case RXRPC_CALL_CLIENT_RECV_REPLY: | |
1231 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
1232 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
1233 | _debug("start ACK timer"); | |
1234 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, | |
1235 | call->ackr_serial, false); | |
1236 | default: | |
1237 | break; | |
1238 | } | |
1239 | goto maybe_reschedule; | |
1240 | } | |
1241 | ||
1242 | kill_ACKs: | |
1243 | del_timer_sync(&call->ack_timer); | |
4c198ad1 | 1244 | if (test_and_clear_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events)) |
17926a79 | 1245 | rxrpc_put_call(call); |
4c198ad1 | 1246 | clear_bit(RXRPC_CALL_EV_ACK, &call->events); |
17926a79 DH |
1247 | |
1248 | maybe_reschedule: | |
1249 | if (call->events || !skb_queue_empty(&call->rx_queue)) { | |
1250 | read_lock_bh(&call->state_lock); | |
1251 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1252 | rxrpc_queue_call(call); |
17926a79 DH |
1253 | read_unlock_bh(&call->state_lock); |
1254 | } | |
1255 | ||
1256 | /* don't leave aborted connections on the accept queue */ | |
1257 | if (call->state >= RXRPC_CALL_COMPLETE && | |
1258 | !list_empty(&call->accept_link)) { | |
1259 | _debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }", | |
0d12f8a4 | 1260 | call, call->events, call->flags, call->conn->cid); |
17926a79 DH |
1261 | |
1262 | read_lock_bh(&call->state_lock); | |
1263 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
4c198ad1 | 1264 | !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) |
651350d1 | 1265 | rxrpc_queue_call(call); |
17926a79 DH |
1266 | read_unlock_bh(&call->state_lock); |
1267 | } | |
1268 | ||
1269 | error: | |
1270 | clear_bit(RXRPC_CALL_PROC_BUSY, &call->flags); | |
1271 | kfree(acks); | |
1272 | ||
1273 | /* because we don't want two CPUs both processing the work item for one | |
1274 | * call at the same time, we use a flag to note when it's busy; however | |
1275 | * this means there's a race between clearing the flag and setting the | |
1276 | * work pending bit and the work item being processed again */ | |
1277 | if (call->events && !work_pending(&call->processor)) { | |
0d12f8a4 | 1278 | _debug("jumpstart %x", call->conn->cid); |
651350d1 | 1279 | rxrpc_queue_call(call); |
17926a79 DH |
1280 | } |
1281 | ||
1282 | _leave(""); | |
1283 | return; | |
1284 | ||
1285 | no_mem: | |
1286 | _debug("out of memory"); | |
1287 | goto maybe_reschedule; | |
1288 | } |