?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux/fpc-iii.git] / net / rxrpc / input.c
blob6fc61400337fb3e8a96658ed685efa9a8280f70e
1 /* RxRPC packet reception
2 *
3 * Copyright (C) 2007, 2016 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #include <linux/module.h>
15 #include <linux/net.h>
16 #include <linux/skbuff.h>
17 #include <linux/errqueue.h>
18 #include <linux/udp.h>
19 #include <linux/in.h>
20 #include <linux/in6.h>
21 #include <linux/icmp.h>
22 #include <linux/gfp.h>
23 #include <net/sock.h>
24 #include <net/af_rxrpc.h>
25 #include <net/ip.h>
26 #include <net/udp.h>
27 #include <net/net_namespace.h>
28 #include "ar-internal.h"
29
30 static void rxrpc_proto_abort(const char *why,
31 struct rxrpc_call *call, rxrpc_seq_t seq)
32 {
33 if (rxrpc_abort_call(why, call, seq, RX_PROTOCOL_ERROR, -EBADMSG)) {
34 set_bit(RXRPC_CALL_EV_ABORT, &call->events);
35 rxrpc_queue_call(call);
36 }
37 }
38
39 /*
40 * Do TCP-style congestion management [RFC 5681].
41 */
42 static void rxrpc_congestion_management(struct rxrpc_call *call,
43 struct sk_buff *skb,
44 struct rxrpc_ack_summary *summary,
45 rxrpc_serial_t acked_serial)
46 {
47 enum rxrpc_congest_change change = rxrpc_cong_no_change;
48 unsigned int cumulative_acks = call->cong_cumul_acks;
49 unsigned int cwnd = call->cong_cwnd;
50 bool resend = false;
51
52 summary->flight_size =
53 (call->tx_top - call->tx_hard_ack) - summary->nr_acks;
54
55 if (test_and_clear_bit(RXRPC_CALL_RETRANS_TIMEOUT, &call->flags)) {
56 summary->retrans_timeo = true;
57 call->cong_ssthresh = max_t(unsigned int,
58 summary->flight_size / 2, 2);
59 cwnd = 1;
60 if (cwnd >= call->cong_ssthresh &&
61 call->cong_mode == RXRPC_CALL_SLOW_START) {
62 call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE;
63 call->cong_tstamp = skb->tstamp;
64 cumulative_acks = 0;
65 }
66 }
67
68 cumulative_acks += summary->nr_new_acks;
69 cumulative_acks += summary->nr_rot_new_acks;
70 if (cumulative_acks > 255)
71 cumulative_acks = 255;
72
73 summary->mode = call->cong_mode;
74 summary->cwnd = call->cong_cwnd;
75 summary->ssthresh = call->cong_ssthresh;
76 summary->cumulative_acks = cumulative_acks;
77 summary->dup_acks = call->cong_dup_acks;
78
79 switch (call->cong_mode) {
80 case RXRPC_CALL_SLOW_START:
81 if (summary->nr_nacks > 0)
82 goto packet_loss_detected;
83 if (summary->cumulative_acks > 0)
84 cwnd += 1;
85 if (cwnd >= call->cong_ssthresh) {
86 call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE;
87 call->cong_tstamp = skb->tstamp;
88 }
89 goto out;
90
91 case RXRPC_CALL_CONGEST_AVOIDANCE:
92 if (summary->nr_nacks > 0)
93 goto packet_loss_detected;
94
95 /* We analyse the number of packets that get ACK'd per RTT
96 * period and increase the window if we managed to fill it.
97 */
98 if (call->peer->rtt_usage == 0)
99 goto out;
100 if (ktime_before(skb->tstamp,
101 ktime_add_ns(call->cong_tstamp,
102 call->peer->rtt)))
103 goto out_no_clear_ca;
104 change = rxrpc_cong_rtt_window_end;
105 call->cong_tstamp = skb->tstamp;
106 if (cumulative_acks >= cwnd)
107 cwnd++;
108 goto out;
109
110 case RXRPC_CALL_PACKET_LOSS:
111 if (summary->nr_nacks == 0)
112 goto resume_normality;
113
114 if (summary->new_low_nack) {
115 change = rxrpc_cong_new_low_nack;
116 call->cong_dup_acks = 1;
117 if (call->cong_extra > 1)
118 call->cong_extra = 1;
119 goto send_extra_data;
120 }
121
122 call->cong_dup_acks++;
123 if (call->cong_dup_acks < 3)
124 goto send_extra_data;
125
126 change = rxrpc_cong_begin_retransmission;
127 call->cong_mode = RXRPC_CALL_FAST_RETRANSMIT;
128 call->cong_ssthresh = max_t(unsigned int,
129 summary->flight_size / 2, 2);
130 cwnd = call->cong_ssthresh + 3;
131 call->cong_extra = 0;
132 call->cong_dup_acks = 0;
133 resend = true;
134 goto out;
135
136 case RXRPC_CALL_FAST_RETRANSMIT:
137 if (!summary->new_low_nack) {
138 if (summary->nr_new_acks == 0)
139 cwnd += 1;
140 call->cong_dup_acks++;
141 if (call->cong_dup_acks == 2) {
142 change = rxrpc_cong_retransmit_again;
143 call->cong_dup_acks = 0;
144 resend = true;
145 }
146 } else {
147 change = rxrpc_cong_progress;
148 cwnd = call->cong_ssthresh;
149 if (summary->nr_nacks == 0)
150 goto resume_normality;
151 }
152 goto out;
153
154 default:
155 BUG();
156 goto out;
157 }
158
159 resume_normality:
160 change = rxrpc_cong_cleared_nacks;
161 call->cong_dup_acks = 0;
162 call->cong_extra = 0;
163 call->cong_tstamp = skb->tstamp;
164 if (cwnd < call->cong_ssthresh)
165 call->cong_mode = RXRPC_CALL_SLOW_START;
166 else
167 call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE;
168 out:
169 cumulative_acks = 0;
170 out_no_clear_ca:
171 if (cwnd >= RXRPC_RXTX_BUFF_SIZE - 1)
172 cwnd = RXRPC_RXTX_BUFF_SIZE - 1;
173 call->cong_cwnd = cwnd;
174 call->cong_cumul_acks = cumulative_acks;
175 trace_rxrpc_congest(call, summary, acked_serial, change);
176 if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
177 rxrpc_queue_call(call);
178 return;
179
180 packet_loss_detected:
181 change = rxrpc_cong_saw_nack;
182 call->cong_mode = RXRPC_CALL_PACKET_LOSS;
183 call->cong_dup_acks = 0;
184 goto send_extra_data;
185
186 send_extra_data:
187 /* Send some previously unsent DATA if we have some to advance the ACK
188 * state.
189 */
190 if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] &
191 RXRPC_TX_ANNO_LAST ||
192 summary->nr_acks != call->tx_top - call->tx_hard_ack) {
193 call->cong_extra++;
194 wake_up(&call->waitq);
195 }
196 goto out_no_clear_ca;
197 }
198
199 /*
200 * Ping the other end to fill our RTT cache and to retrieve the rwind
201 * and MTU parameters.
202 */
203 static void rxrpc_send_ping(struct rxrpc_call *call, struct sk_buff *skb,
204 int skew)
205 {
206 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
207 ktime_t now = skb->tstamp;
208
209 if (call->peer->rtt_usage < 3 ||
210 ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), now))
211 rxrpc_propose_ACK(call, RXRPC_ACK_PING, skew, sp->hdr.serial,
212 true, true,
213 rxrpc_propose_ack_ping_for_params);
214 }
215
216 /*
217 * Apply a hard ACK by advancing the Tx window.
218 */
219 static void rxrpc_rotate_tx_window(struct rxrpc_call *call, rxrpc_seq_t to,
220 struct rxrpc_ack_summary *summary)
221 {
222 struct sk_buff *skb, *list = NULL;
223 int ix;
224 u8 annotation;
225
226 if (call->acks_lowest_nak == call->tx_hard_ack) {
227 call->acks_lowest_nak = to;
228 } else if (before_eq(call->acks_lowest_nak, to)) {
229 summary->new_low_nack = true;
230 call->acks_lowest_nak = to;
231 }
232
233 spin_lock(&call->lock);
234
235 while (before(call->tx_hard_ack, to)) {
236 call->tx_hard_ack++;
237 ix = call->tx_hard_ack & RXRPC_RXTX_BUFF_MASK;
238 skb = call->rxtx_buffer[ix];
239 annotation = call->rxtx_annotations[ix];
240 rxrpc_see_skb(skb, rxrpc_skb_tx_rotated);
241 call->rxtx_buffer[ix] = NULL;
242 call->rxtx_annotations[ix] = 0;
243 skb->next = list;
244 list = skb;
245
246 if (annotation & RXRPC_TX_ANNO_LAST)
247 set_bit(RXRPC_CALL_TX_LAST, &call->flags);
248 if ((annotation & RXRPC_TX_ANNO_MASK) != RXRPC_TX_ANNO_ACK)
249 summary->nr_rot_new_acks++;
250 }
251
252 spin_unlock(&call->lock);
253
254 trace_rxrpc_transmit(call, (test_bit(RXRPC_CALL_TX_LAST, &call->flags) ?
255 rxrpc_transmit_rotate_last :
256 rxrpc_transmit_rotate));
257 wake_up(&call->waitq);
258
259 while (list) {
260 skb = list;
261 list = skb->next;
262 skb->next = NULL;
263 rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
264 }
265 }
266
267 /*
268 * End the transmission phase of a call.
269 *
270 * This occurs when we get an ACKALL packet, the first DATA packet of a reply,
271 * or a final ACK packet.
272 */
273 static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun,
274 const char *abort_why)
275 {
276
277 ASSERT(test_bit(RXRPC_CALL_TX_LAST, &call->flags));
278
279 write_lock(&call->state_lock);
280
281 switch (call->state) {
282 case RXRPC_CALL_CLIENT_SEND_REQUEST:
283 case RXRPC_CALL_CLIENT_AWAIT_REPLY:
284 if (reply_begun)
285 call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
286 else
287 call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
288 break;
289
290 case RXRPC_CALL_SERVER_AWAIT_ACK:
291 __rxrpc_call_completed(call);
292 rxrpc_notify_socket(call);
293 break;
294
295 default:
296 goto bad_state;
297 }
298
299 write_unlock(&call->state_lock);
300 if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) {
301 trace_rxrpc_transmit(call, rxrpc_transmit_await_reply);
302 } else {
303 trace_rxrpc_transmit(call, rxrpc_transmit_end);
304 }
305 _leave(" = ok");
306 return true;
307
308 bad_state:
309 write_unlock(&call->state_lock);
310 kdebug("end_tx %s", rxrpc_call_states[call->state]);
311 rxrpc_proto_abort(abort_why, call, call->tx_top);
312 return false;
313 }
314
315 /*
316 * Begin the reply reception phase of a call.
317 */
318 static bool rxrpc_receiving_reply(struct rxrpc_call *call)
319 {
320 struct rxrpc_ack_summary summary = { 0 };
321 unsigned long now, timo;
322 rxrpc_seq_t top = READ_ONCE(call->tx_top);
323
324 if (call->ackr_reason) {
325 spin_lock_bh(&call->lock);
326 call->ackr_reason = 0;
327 spin_unlock_bh(&call->lock);
328 now = jiffies;
329 timo = now + MAX_JIFFY_OFFSET;
330 WRITE_ONCE(call->resend_at, timo);
331 WRITE_ONCE(call->ack_at, timo);
332 trace_rxrpc_timer(call, rxrpc_timer_init_for_reply, now);
333 }
334
335 if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags))
336 rxrpc_rotate_tx_window(call, top, &summary);
337 if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags)) {
338 rxrpc_proto_abort("TXL", call, top);
339 return false;
340 }
341 if (!rxrpc_end_tx_phase(call, true, "ETD"))
342 return false;
343 call->tx_phase = false;
344 return true;
345 }
346
347 /*
348 * Scan a jumbo packet to validate its structure and to work out how many
349 * subpackets it contains.
350 *
351 * A jumbo packet is a collection of consecutive packets glued together with
352 * little headers between that indicate how to change the initial header for
353 * each subpacket.
354 *
355 * RXRPC_JUMBO_PACKET must be set on all but the last subpacket - and all but
356 * the last are RXRPC_JUMBO_DATALEN in size. The last subpacket may be of any
357 * size.
358 */
359 static bool rxrpc_validate_jumbo(struct sk_buff *skb)
360 {
361 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
362 unsigned int offset = sizeof(struct rxrpc_wire_header);
363 unsigned int len = skb->len;
364 int nr_jumbo = 1;
365 u8 flags = sp->hdr.flags;
366
367 do {
368 nr_jumbo++;
369 if (len - offset < RXRPC_JUMBO_SUBPKTLEN)
370 goto protocol_error;
371 if (flags & RXRPC_LAST_PACKET)
372 goto protocol_error;
373 offset += RXRPC_JUMBO_DATALEN;
374 if (skb_copy_bits(skb, offset, &flags, 1) < 0)
375 goto protocol_error;
376 offset += sizeof(struct rxrpc_jumbo_header);
377 } while (flags & RXRPC_JUMBO_PACKET);
378
379 sp->nr_jumbo = nr_jumbo;
380 return true;
381
382 protocol_error:
383 return false;
384 }
385
386 /*
387 * Handle reception of a duplicate packet.
388 *
389 * We have to take care to avoid an attack here whereby we're given a series of
390 * jumbograms, each with a sequence number one before the preceding one and
391 * filled up to maximum UDP size. If they never send us the first packet in
392 * the sequence, they can cause us to have to hold on to around 2MiB of kernel
393 * space until the call times out.
394 *
395 * We limit the space usage by only accepting three duplicate jumbo packets per
396 * call. After that, we tell the other side we're no longer accepting jumbos
397 * (that information is encoded in the ACK packet).
398 */
399 static void rxrpc_input_dup_data(struct rxrpc_call *call, rxrpc_seq_t seq,
400 u8 annotation, bool *_jumbo_bad)
401 {
402 /* Discard normal packets that are duplicates. */
403 if (annotation == 0)
404 return;
405
406 /* Skip jumbo subpackets that are duplicates. When we've had three or
407 * more partially duplicate jumbo packets, we refuse to take any more
408 * jumbos for this call.
409 */
410 if (!*_jumbo_bad) {
411 call->nr_jumbo_bad++;
412 *_jumbo_bad = true;
413 }
414 }
415
416 /*
417 * Process a DATA packet, adding the packet to the Rx ring.
418 */
419 static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb,
420 u16 skew)
421 {
422 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
423 enum rxrpc_call_state state;
424 unsigned int offset = sizeof(struct rxrpc_wire_header);
425 unsigned int ix;
426 rxrpc_serial_t serial = sp->hdr.serial, ack_serial = 0;
427 rxrpc_seq_t seq = sp->hdr.seq, hard_ack;
428 bool immediate_ack = false, jumbo_bad = false, queued;
429 u16 len;
430 u8 ack = 0, flags, annotation = 0;
431
432 _enter("{%u,%u},{%u,%u}",
433 call->rx_hard_ack, call->rx_top, skb->len, seq);
434
435 _proto("Rx DATA %%%u { #%u f=%02x }",
436 sp->hdr.serial, seq, sp->hdr.flags);
437
438 state = READ_ONCE(call->state);
439 if (state >= RXRPC_CALL_COMPLETE)
440 return;
441
442 if (call->state == RXRPC_CALL_SERVER_RECV_REQUEST) {
443 unsigned long timo = READ_ONCE(call->next_req_timo);
444 unsigned long now, expect_req_by;
445
446 if (timo) {
447 now = jiffies;
448 expect_req_by = now + timo;
449 WRITE_ONCE(call->expect_req_by, expect_req_by);
450 rxrpc_reduce_call_timer(call, expect_req_by, now,
451 rxrpc_timer_set_for_idle);
452 }
453 }
454
455 /* Received data implicitly ACKs all of the request packets we sent
456 * when we're acting as a client.
457 */
458 if ((state == RXRPC_CALL_CLIENT_SEND_REQUEST ||
459 state == RXRPC_CALL_CLIENT_AWAIT_REPLY) &&
460 !rxrpc_receiving_reply(call))
461 return;
462
463 call->ackr_prev_seq = seq;
464
465 hard_ack = READ_ONCE(call->rx_hard_ack);
466 if (after(seq, hard_ack + call->rx_winsize)) {
467 ack = RXRPC_ACK_EXCEEDS_WINDOW;
468 ack_serial = serial;
469 goto ack;
470 }
471
472 flags = sp->hdr.flags;
473 if (flags & RXRPC_JUMBO_PACKET) {
474 if (call->nr_jumbo_bad > 3) {
475 ack = RXRPC_ACK_NOSPACE;
476 ack_serial = serial;
477 goto ack;
478 }
479 annotation = 1;
480 }
481
482 next_subpacket:
483 queued = false;
484 ix = seq & RXRPC_RXTX_BUFF_MASK;
485 len = skb->len;
486 if (flags & RXRPC_JUMBO_PACKET)
487 len = RXRPC_JUMBO_DATALEN;
488
489 if (flags & RXRPC_LAST_PACKET) {
490 if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) &&
491 seq != call->rx_top)
492 return rxrpc_proto_abort("LSN", call, seq);
493 } else {
494 if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) &&
495 after_eq(seq, call->rx_top))
496 return rxrpc_proto_abort("LSA", call, seq);
497 }
498
499 trace_rxrpc_rx_data(call, seq, serial, flags, annotation);
500 if (before_eq(seq, hard_ack)) {
501 ack = RXRPC_ACK_DUPLICATE;
502 ack_serial = serial;
503 goto skip;
504 }
505
506 if (flags & RXRPC_REQUEST_ACK && !ack) {
507 ack = RXRPC_ACK_REQUESTED;
508 ack_serial = serial;
509 }
510
511 if (call->rxtx_buffer[ix]) {
512 rxrpc_input_dup_data(call, seq, annotation, &jumbo_bad);
513 if (ack != RXRPC_ACK_DUPLICATE) {
514 ack = RXRPC_ACK_DUPLICATE;
515 ack_serial = serial;
516 }
517 immediate_ack = true;
518 goto skip;
519 }
520
521 /* Queue the packet. We use a couple of memory barriers here as need
522 * to make sure that rx_top is perceived to be set after the buffer
523 * pointer and that the buffer pointer is set after the annotation and
524 * the skb data.
525 *
526 * Barriers against rxrpc_recvmsg_data() and rxrpc_rotate_rx_window()
527 * and also rxrpc_fill_out_ack().
528 */
529 rxrpc_get_skb(skb, rxrpc_skb_rx_got);
530 call->rxtx_annotations[ix] = annotation;
531 smp_wmb();
532 call->rxtx_buffer[ix] = skb;
533 if (after(seq, call->rx_top)) {
534 smp_store_release(&call->rx_top, seq);
535 } else if (before(seq, call->rx_top)) {
536 /* Send an immediate ACK if we fill in a hole */
537 if (!ack) {
538 ack = RXRPC_ACK_DELAY;
539 ack_serial = serial;
540 }
541 immediate_ack = true;
542 }
543 if (flags & RXRPC_LAST_PACKET) {
544 set_bit(RXRPC_CALL_RX_LAST, &call->flags);
545 trace_rxrpc_receive(call, rxrpc_receive_queue_last, serial, seq);
546 } else {
547 trace_rxrpc_receive(call, rxrpc_receive_queue, serial, seq);
548 }
549 queued = true;
550
551 if (after_eq(seq, call->rx_expect_next)) {
552 if (after(seq, call->rx_expect_next)) {
553 _net("OOS %u > %u", seq, call->rx_expect_next);
554 ack = RXRPC_ACK_OUT_OF_SEQUENCE;
555 ack_serial = serial;
556 }
557 call->rx_expect_next = seq + 1;
558 }
559
560 skip:
561 offset += len;
562 if (flags & RXRPC_JUMBO_PACKET) {
563 if (skb_copy_bits(skb, offset, &flags, 1) < 0)
564 return rxrpc_proto_abort("XJF", call, seq);
565 offset += sizeof(struct rxrpc_jumbo_header);
566 seq++;
567 serial++;
568 annotation++;
569 if (flags & RXRPC_JUMBO_PACKET)
570 annotation |= RXRPC_RX_ANNO_JLAST;
571 if (after(seq, hard_ack + call->rx_winsize)) {
572 ack = RXRPC_ACK_EXCEEDS_WINDOW;
573 ack_serial = serial;
574 if (!jumbo_bad) {
575 call->nr_jumbo_bad++;
576 jumbo_bad = true;
577 }
578 goto ack;
579 }
580
581 _proto("Rx DATA Jumbo %%%u", serial);
582 goto next_subpacket;
583 }
584
585 if (queued && flags & RXRPC_LAST_PACKET && !ack) {
586 ack = RXRPC_ACK_DELAY;
587 ack_serial = serial;
588 }
589
590 ack:
591 if (ack)
592 rxrpc_propose_ACK(call, ack, skew, ack_serial,
593 immediate_ack, true,
594 rxrpc_propose_ack_input_data);
595
596 if (sp->hdr.seq == READ_ONCE(call->rx_hard_ack) + 1)
597 rxrpc_notify_socket(call);
598 _leave(" [queued]");
599 }
600
601 /*
602 * Process a requested ACK.
603 */
604 static void rxrpc_input_requested_ack(struct rxrpc_call *call,
605 ktime_t resp_time,
606 rxrpc_serial_t orig_serial,
607 rxrpc_serial_t ack_serial)
608 {
609 struct rxrpc_skb_priv *sp;
610 struct sk_buff *skb;
611 ktime_t sent_at;
612 int ix;
613
614 for (ix = 0; ix < RXRPC_RXTX_BUFF_SIZE; ix++) {
615 skb = call->rxtx_buffer[ix];
616 if (!skb)
617 continue;
618
619 sp = rxrpc_skb(skb);
620 if (sp->hdr.serial != orig_serial)
621 continue;
622 smp_rmb();
623 sent_at = skb->tstamp;
624 goto found;
625 }
626 return;
627
628 found:
629 rxrpc_peer_add_rtt(call, rxrpc_rtt_rx_requested_ack,
630 orig_serial, ack_serial, sent_at, resp_time);
631 }
632
633 /*
634 * Process the response to a ping that we sent to find out if we lost an ACK.
635 *
636 * If we got back a ping response that indicates a lower tx_top than what we
637 * had at the time of the ping transmission, we adjudge all the DATA packets
638 * sent between the response tx_top and the ping-time tx_top to have been lost.
639 */
640 static void rxrpc_input_check_for_lost_ack(struct rxrpc_call *call)
641 {
642 rxrpc_seq_t top, bottom, seq;
643 bool resend = false;
644
645 spin_lock_bh(&call->lock);
646
647 bottom = call->tx_hard_ack + 1;
648 top = call->acks_lost_top;
649 if (before(bottom, top)) {
650 for (seq = bottom; before_eq(seq, top); seq++) {
651 int ix = seq & RXRPC_RXTX_BUFF_MASK;
652 u8 annotation = call->rxtx_annotations[ix];
653 u8 anno_type = annotation & RXRPC_TX_ANNO_MASK;
654
655 if (anno_type != RXRPC_TX_ANNO_UNACK)
656 continue;
657 annotation &= ~RXRPC_TX_ANNO_MASK;
658 annotation |= RXRPC_TX_ANNO_RETRANS;
659 call->rxtx_annotations[ix] = annotation;
660 resend = true;
661 }
662 }
663
664 spin_unlock_bh(&call->lock);
665
666 if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
667 rxrpc_queue_call(call);
668 }
669
670 /*
671 * Process a ping response.
672 */
673 static void rxrpc_input_ping_response(struct rxrpc_call *call,
674 ktime_t resp_time,
675 rxrpc_serial_t orig_serial,
676 rxrpc_serial_t ack_serial)
677 {
678 rxrpc_serial_t ping_serial;
679 ktime_t ping_time;
680
681 ping_time = call->ping_time;
682 smp_rmb();
683 ping_serial = call->ping_serial;
684
685 if (orig_serial == call->acks_lost_ping)
686 rxrpc_input_check_for_lost_ack(call);
687
688 if (!test_bit(RXRPC_CALL_PINGING, &call->flags) ||
689 before(orig_serial, ping_serial))
690 return;
691 clear_bit(RXRPC_CALL_PINGING, &call->flags);
692 if (after(orig_serial, ping_serial))
693 return;
694
695 rxrpc_peer_add_rtt(call, rxrpc_rtt_rx_ping_response,
696 orig_serial, ack_serial, ping_time, resp_time);
697 }
698
699 /*
700 * Process the extra information that may be appended to an ACK packet
701 */
702 static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb,
703 struct rxrpc_ackinfo *ackinfo)
704 {
705 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
706 struct rxrpc_peer *peer;
707 unsigned int mtu;
708 bool wake = false;
709 u32 rwind = ntohl(ackinfo->rwind);
710
711 _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }",
712 sp->hdr.serial,
713 ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU),
714 rwind, ntohl(ackinfo->jumbo_max));
715
716 if (call->tx_winsize != rwind) {
717 if (rwind > RXRPC_RXTX_BUFF_SIZE - 1)
718 rwind = RXRPC_RXTX_BUFF_SIZE - 1;
719 if (rwind > call->tx_winsize)
720 wake = true;
721 trace_rxrpc_rx_rwind_change(call, sp->hdr.serial,
722 ntohl(ackinfo->rwind), wake);
723 call->tx_winsize = rwind;
724 }
725
726 if (call->cong_ssthresh > rwind)
727 call->cong_ssthresh = rwind;
728
729 mtu = min(ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU));
730
731 peer = call->peer;
732 if (mtu < peer->maxdata) {
733 spin_lock_bh(&peer->lock);
734 peer->maxdata = mtu;
735 peer->mtu = mtu + peer->hdrsize;
736 spin_unlock_bh(&peer->lock);
737 _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata);
738 }
739
740 if (wake)
741 wake_up(&call->waitq);
742 }
743
744 /*
745 * Process individual soft ACKs.
746 *
747 * Each ACK in the array corresponds to one packet and can be either an ACK or
748 * a NAK. If we get find an explicitly NAK'd packet we resend immediately;
749 * packets that lie beyond the end of the ACK list are scheduled for resend by
750 * the timer on the basis that the peer might just not have processed them at
751 * the time the ACK was sent.
752 */
753 static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks,
754 rxrpc_seq_t seq, int nr_acks,
755 struct rxrpc_ack_summary *summary)
756 {
757 int ix;
758 u8 annotation, anno_type;
759
760 for (; nr_acks > 0; nr_acks--, seq++) {
761 ix = seq & RXRPC_RXTX_BUFF_MASK;
762 annotation = call->rxtx_annotations[ix];
763 anno_type = annotation & RXRPC_TX_ANNO_MASK;
764 annotation &= ~RXRPC_TX_ANNO_MASK;
765 switch (*acks++) {
766 case RXRPC_ACK_TYPE_ACK:
767 summary->nr_acks++;
768 if (anno_type == RXRPC_TX_ANNO_ACK)
769 continue;
770 summary->nr_new_acks++;
771 call->rxtx_annotations[ix] =
772 RXRPC_TX_ANNO_ACK | annotation;
773 break;
774 case RXRPC_ACK_TYPE_NACK:
775 if (!summary->nr_nacks &&
776 call->acks_lowest_nak != seq) {
777 call->acks_lowest_nak = seq;
778 summary->new_low_nack = true;
779 }
780 summary->nr_nacks++;
781 if (anno_type == RXRPC_TX_ANNO_NAK)
782 continue;
783 summary->nr_new_nacks++;
784 if (anno_type == RXRPC_TX_ANNO_RETRANS)
785 continue;
786 call->rxtx_annotations[ix] =
787 RXRPC_TX_ANNO_NAK | annotation;
788 break;
789 default:
790 return rxrpc_proto_abort("SFT", call, 0);
791 }
792 }
793 }
794
795 /*
796 * Process an ACK packet.
797 *
798 * ack.firstPacket is the sequence number of the first soft-ACK'd/NAK'd packet
799 * in the ACK array. Anything before that is hard-ACK'd and may be discarded.
800 *
801 * A hard-ACK means that a packet has been processed and may be discarded; a
802 * soft-ACK means that the packet may be discarded and retransmission
803 * requested. A phase is complete when all packets are hard-ACK'd.
804 */
805 static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb,
806 u16 skew)
807 {
808 struct rxrpc_ack_summary summary = { 0 };
809 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
810 union {
811 struct rxrpc_ackpacket ack;
812 struct rxrpc_ackinfo info;
813 u8 acks[RXRPC_MAXACKS];
814 } buf;
815 rxrpc_serial_t acked_serial;
816 rxrpc_seq_t first_soft_ack, hard_ack;
817 int nr_acks, offset, ioffset;
818
819 _enter("");
820
821 offset = sizeof(struct rxrpc_wire_header);
822 if (skb_copy_bits(skb, offset, &buf.ack, sizeof(buf.ack)) < 0) {
823 _debug("extraction failure");
824 return rxrpc_proto_abort("XAK", call, 0);
825 }
826 offset += sizeof(buf.ack);
827
828 acked_serial = ntohl(buf.ack.serial);
829 first_soft_ack = ntohl(buf.ack.firstPacket);
830 hard_ack = first_soft_ack - 1;
831 nr_acks = buf.ack.nAcks;
832 summary.ack_reason = (buf.ack.reason < RXRPC_ACK__INVALID ?
833 buf.ack.reason : RXRPC_ACK__INVALID);
834
835 trace_rxrpc_rx_ack(call, sp->hdr.serial, acked_serial,
836 first_soft_ack, ntohl(buf.ack.previousPacket),
837 summary.ack_reason, nr_acks);
838
839 if (buf.ack.reason == RXRPC_ACK_PING_RESPONSE)
840 rxrpc_input_ping_response(call, skb->tstamp, acked_serial,
841 sp->hdr.serial);
842 if (buf.ack.reason == RXRPC_ACK_REQUESTED)
843 rxrpc_input_requested_ack(call, skb->tstamp, acked_serial,
844 sp->hdr.serial);
845
846 if (buf.ack.reason == RXRPC_ACK_PING) {
847 _proto("Rx ACK %%%u PING Request", sp->hdr.serial);
848 rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE,
849 skew, sp->hdr.serial, true, true,
850 rxrpc_propose_ack_respond_to_ping);
851 } else if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
852 rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED,
853 skew, sp->hdr.serial, true, true,
854 rxrpc_propose_ack_respond_to_ack);
855 }
856
857 ioffset = offset + nr_acks + 3;
858 if (skb->len >= ioffset + sizeof(buf.info)) {
859 if (skb_copy_bits(skb, ioffset, &buf.info, sizeof(buf.info)) < 0)
860 return rxrpc_proto_abort("XAI", call, 0);
861 rxrpc_input_ackinfo(call, skb, &buf.info);
862 }
863
864 if (first_soft_ack == 0)
865 return rxrpc_proto_abort("AK0", call, 0);
866
867 /* Ignore ACKs unless we are or have just been transmitting. */
868 switch (READ_ONCE(call->state)) {
869 case RXRPC_CALL_CLIENT_SEND_REQUEST:
870 case RXRPC_CALL_CLIENT_AWAIT_REPLY:
871 case RXRPC_CALL_SERVER_SEND_REPLY:
872 case RXRPC_CALL_SERVER_AWAIT_ACK:
873 break;
874 default:
875 return;
876 }
877
878 /* Discard any out-of-order or duplicate ACKs. */
879 if (before_eq(sp->hdr.serial, call->acks_latest)) {
880 _debug("discard ACK %d <= %d",
881 sp->hdr.serial, call->acks_latest);
882 return;
883 }
884 call->acks_latest_ts = skb->tstamp;
885 call->acks_latest = sp->hdr.serial;
886
887 if (before(hard_ack, call->tx_hard_ack) ||
888 after(hard_ack, call->tx_top))
889 return rxrpc_proto_abort("AKW", call, 0);
890 if (nr_acks > call->tx_top - hard_ack)
891 return rxrpc_proto_abort("AKN", call, 0);
892
893 if (after(hard_ack, call->tx_hard_ack))
894 rxrpc_rotate_tx_window(call, hard_ack, &summary);
895
896 if (nr_acks > 0) {
897 if (skb_copy_bits(skb, offset, buf.acks, nr_acks) < 0)
898 return rxrpc_proto_abort("XSA", call, 0);
899 rxrpc_input_soft_acks(call, buf.acks, first_soft_ack, nr_acks,
900 &summary);
901 }
902
903 if (test_bit(RXRPC_CALL_TX_LAST, &call->flags)) {
904 rxrpc_end_tx_phase(call, false, "ETA");
905 return;
906 }
907
908 if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] &
909 RXRPC_TX_ANNO_LAST &&
910 summary.nr_acks == call->tx_top - hard_ack &&
911 rxrpc_is_client_call(call))
912 rxrpc_propose_ACK(call, RXRPC_ACK_PING, skew, sp->hdr.serial,
913 false, true,
914 rxrpc_propose_ack_ping_for_lost_reply);
915
916 return rxrpc_congestion_management(call, skb, &summary, acked_serial);
917 }
918
919 /*
920 * Process an ACKALL packet.
921 */
922 static void rxrpc_input_ackall(struct rxrpc_call *call, struct sk_buff *skb)
923 {
924 struct rxrpc_ack_summary summary = { 0 };
925 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
926
927 _proto("Rx ACKALL %%%u", sp->hdr.serial);
928
929 rxrpc_rotate_tx_window(call, call->tx_top, &summary);
930 if (test_bit(RXRPC_CALL_TX_LAST, &call->flags))
931 rxrpc_end_tx_phase(call, false, "ETL");
932 }
933
934 /*
935 * Process an ABORT packet directed at a call.
936 */
937 static void rxrpc_input_abort(struct rxrpc_call *call, struct sk_buff *skb)
938 {
939 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
940 __be32 wtmp;
941 u32 abort_code = RX_CALL_DEAD;
942
943 _enter("");
944
945 if (skb->len >= 4 &&
946 skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
947 &wtmp, sizeof(wtmp)) >= 0)
948 abort_code = ntohl(wtmp);
949
950 trace_rxrpc_rx_abort(call, sp->hdr.serial, abort_code);
951
952 _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code);
953
954 if (rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
955 abort_code, -ECONNABORTED))
956 rxrpc_notify_socket(call);
957 }
958
959 /*
960 * Process an incoming call packet.
961 */
962 static void rxrpc_input_call_packet(struct rxrpc_call *call,
963 struct sk_buff *skb, u16 skew)
964 {
965 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
966 unsigned long timo;
967
968 _enter("%p,%p", call, skb);
969
970 timo = READ_ONCE(call->next_rx_timo);
971 if (timo) {
972 unsigned long now = jiffies, expect_rx_by;
973
974 expect_rx_by = jiffies + timo;
975 WRITE_ONCE(call->expect_rx_by, expect_rx_by);
976 rxrpc_reduce_call_timer(call, expect_rx_by, now,
977 rxrpc_timer_set_for_normal);
978 }
979
980 switch (sp->hdr.type) {
981 case RXRPC_PACKET_TYPE_DATA:
982 rxrpc_input_data(call, skb, skew);
983 break;
984
985 case RXRPC_PACKET_TYPE_ACK:
986 rxrpc_input_ack(call, skb, skew);
987 break;
988
989 case RXRPC_PACKET_TYPE_BUSY:
990 _proto("Rx BUSY %%%u", sp->hdr.serial);
991
992 /* Just ignore BUSY packets from the server; the retry and
993 * lifespan timers will take care of business. BUSY packets
994 * from the client don't make sense.
995 */
996 break;
997
998 case RXRPC_PACKET_TYPE_ABORT:
999 rxrpc_input_abort(call, skb);
1000 break;
1001
1002 case RXRPC_PACKET_TYPE_ACKALL:
1003 rxrpc_input_ackall(call, skb);
1004 break;
1005
1006 default:
1007 break;
1008 }
1009
1010 _leave("");
1011 }
1012
1013 /*
1014 * Handle a new call on a channel implicitly completing the preceding call on
1015 * that channel.
1016 *
1017 * TODO: If callNumber > call_id + 1, renegotiate security.
1018 */
1019 static void rxrpc_input_implicit_end_call(struct rxrpc_connection *conn,
1020 struct rxrpc_call *call)
1021 {
1022 switch (READ_ONCE(call->state)) {
1023 case RXRPC_CALL_SERVER_AWAIT_ACK:
1024 rxrpc_call_completed(call);
1025 break;
1026 case RXRPC_CALL_COMPLETE:
1027 break;
1028 default:
1029 if (rxrpc_abort_call("IMP", call, 0, RX_CALL_DEAD, -ESHUTDOWN)) {
1030 set_bit(RXRPC_CALL_EV_ABORT, &call->events);
1031 rxrpc_queue_call(call);
1032 }
1033 break;
1034 }
1035
1036 trace_rxrpc_improper_term(call);
1037 __rxrpc_disconnect_call(conn, call);
1038 rxrpc_notify_socket(call);
1039 }
1040
1041 /*
1042 * post connection-level events to the connection
1043 * - this includes challenges, responses, some aborts and call terminal packet
1044 * retransmission.
1045 */
1046 static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
1047 struct sk_buff *skb)
1048 {
1049 _enter("%p,%p", conn, skb);
1050
1051 skb_queue_tail(&conn->rx_queue, skb);
1052 rxrpc_queue_conn(conn);
1053 }
1054
1055 /*
1056 * post endpoint-level events to the local endpoint
1057 * - this includes debug and version messages
1058 */
1059 static void rxrpc_post_packet_to_local(struct rxrpc_local *local,
1060 struct sk_buff *skb)
1061 {
1062 _enter("%p,%p", local, skb);
1063
1064 skb_queue_tail(&local->event_queue, skb);
1065 rxrpc_queue_local(local);
1066 }
1067
1068 /*
1069 * put a packet up for transport-level abort
1070 */
1071 static void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
1072 {
1073 CHECK_SLAB_OKAY(&local->usage);
1074
1075 skb_queue_tail(&local->reject_queue, skb);
1076 rxrpc_queue_local(local);
1077 }
1078
1079 /*
1080 * Extract the wire header from a packet and translate the byte order.
1081 */
1082 static noinline
1083 int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb)
1084 {
1085 struct rxrpc_wire_header whdr;
1086
1087 /* dig out the RxRPC connection details */
1088 if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) {
1089 trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
1090 tracepoint_string("bad_hdr"));
1091 return -EBADMSG;
1092 }
1093
1094 memset(sp, 0, sizeof(*sp));
1095 sp->hdr.epoch = ntohl(whdr.epoch);
1096 sp->hdr.cid = ntohl(whdr.cid);
1097 sp->hdr.callNumber = ntohl(whdr.callNumber);
1098 sp->hdr.seq = ntohl(whdr.seq);
1099 sp->hdr.serial = ntohl(whdr.serial);
1100 sp->hdr.flags = whdr.flags;
1101 sp->hdr.type = whdr.type;
1102 sp->hdr.userStatus = whdr.userStatus;
1103 sp->hdr.securityIndex = whdr.securityIndex;
1104 sp->hdr._rsvd = ntohs(whdr._rsvd);
1105 sp->hdr.serviceId = ntohs(whdr.serviceId);
1106 return 0;
1107 }
1108
1109 /*
1110 * handle data received on the local endpoint
1111 * - may be called in interrupt context
1112 *
1113 * The socket is locked by the caller and this prevents the socket from being
1114 * shut down and the local endpoint from going away, thus sk_user_data will not
1115 * be cleared until this function returns.
1116 */
1117 void rxrpc_data_ready(struct sock *udp_sk)
1118 {
1119 struct rxrpc_connection *conn;
1120 struct rxrpc_channel *chan;
1121 struct rxrpc_call *call;
1122 struct rxrpc_skb_priv *sp;
1123 struct rxrpc_local *local = udp_sk->sk_user_data;
1124 struct sk_buff *skb;
1125 unsigned int channel;
1126 int ret, skew;
1127
1128 _enter("%p", udp_sk);
1129
1130 ASSERT(!irqs_disabled());
1131
1132 skb = skb_recv_udp(udp_sk, 0, 1, &ret);
1133 if (!skb) {
1134 if (ret == -EAGAIN)
1135 return;
1136 _debug("UDP socket error %d", ret);
1137 return;
1138 }
1139
1140 rxrpc_new_skb(skb, rxrpc_skb_rx_received);
1141
1142 _net("recv skb %p", skb);
1143
1144 /* we'll probably need to checksum it (didn't call sock_recvmsg) */
1145 if (skb_checksum_complete(skb)) {
1146 rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
1147 __UDP_INC_STATS(&init_net, UDP_MIB_INERRORS, 0);
1148 _leave(" [CSUM failed]");
1149 return;
1150 }
1151
1152 __UDP_INC_STATS(&init_net, UDP_MIB_INDATAGRAMS, 0);
1153
1154 /* The UDP protocol already released all skb resources;
1155 * we are free to add our own data there.
1156 */
1157 sp = rxrpc_skb(skb);
1158
1159 /* dig out the RxRPC connection details */
1160 if (rxrpc_extract_header(sp, skb) < 0)
1161 goto bad_message;
1162
1163 if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
1164 static int lose;
1165 if ((lose++ & 7) == 7) {
1166 trace_rxrpc_rx_lose(sp);
1167 rxrpc_lose_skb(skb, rxrpc_skb_rx_lost);
1168 return;
1169 }
1170 }
1171
1172 trace_rxrpc_rx_packet(sp);
1173
1174 _net("Rx RxRPC %s ep=%x call=%x:%x",
1175 sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
1176 sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber);
1177
1178 if (sp->hdr.type >= RXRPC_N_PACKET_TYPES ||
1179 !((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) {
1180 _proto("Rx Bad Packet Type %u", sp->hdr.type);
1181 goto bad_message;
1182 }
1183
1184 switch (sp->hdr.type) {
1185 case RXRPC_PACKET_TYPE_VERSION:
1186 rxrpc_post_packet_to_local(local, skb);
1187 goto out;
1188
1189 case RXRPC_PACKET_TYPE_BUSY:
1190 if (sp->hdr.flags & RXRPC_CLIENT_INITIATED)
1191 goto discard;
1192 /* Fall through */
1193
1194 case RXRPC_PACKET_TYPE_DATA:
1195 if (sp->hdr.callNumber == 0)
1196 goto bad_message;
1197 if (sp->hdr.flags & RXRPC_JUMBO_PACKET &&
1198 !rxrpc_validate_jumbo(skb))
1199 goto bad_message;
1200 break;
1201 }
1202
1203 rcu_read_lock();
1204
1205 conn = rxrpc_find_connection_rcu(local, skb);
1206 if (conn) {
1207 if (sp->hdr.securityIndex != conn->security_ix)
1208 goto wrong_security;
1209
1210 if (sp->hdr.serviceId != conn->service_id) {
1211 if (!test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) ||
1212 conn->service_id != conn->params.service_id)
1213 goto reupgrade;
1214 conn->service_id = sp->hdr.serviceId;
1215 }
1216
1217 if (sp->hdr.callNumber == 0) {
1218 /* Connection-level packet */
1219 _debug("CONN %p {%d}", conn, conn->debug_id);
1220 rxrpc_post_packet_to_conn(conn, skb);
1221 goto out_unlock;
1222 }
1223
1224 /* Note the serial number skew here */
1225 skew = (int)sp->hdr.serial - (int)conn->hi_serial;
1226 if (skew >= 0) {
1227 if (skew > 0)
1228 conn->hi_serial = sp->hdr.serial;
1229 } else {
1230 skew = -skew;
1231 skew = min(skew, 65535);
1232 }
1233
1234 /* Call-bound packets are routed by connection channel. */
1235 channel = sp->hdr.cid & RXRPC_CHANNELMASK;
1236 chan = &conn->channels[channel];
1237
1238 /* Ignore really old calls */
1239 if (sp->hdr.callNumber < chan->last_call)
1240 goto discard_unlock;
1241
1242 if (sp->hdr.callNumber == chan->last_call) {
1243 /* For the previous service call, if completed successfully, we
1244 * discard all further packets.
1245 */
1246 if (rxrpc_conn_is_service(conn) &&
1247 (chan->last_type == RXRPC_PACKET_TYPE_ACK ||
1248 sp->hdr.type == RXRPC_PACKET_TYPE_ABORT))
1249 goto discard_unlock;
1250
1251 /* But otherwise we need to retransmit the final packet from
1252 * data cached in the connection record.
1253 */
1254 rxrpc_post_packet_to_conn(conn, skb);
1255 goto out_unlock;
1256 }
1257
1258 call = rcu_dereference(chan->call);
1259
1260 if (sp->hdr.callNumber > chan->call_id) {
1261 if (!(sp->hdr.flags & RXRPC_CLIENT_INITIATED)) {
1262 rcu_read_unlock();
1263 goto reject_packet;
1264 }
1265 if (call)
1266 rxrpc_input_implicit_end_call(conn, call);
1267 call = NULL;
1268 }
1269
1270 if (call && sp->hdr.serviceId != call->service_id)
1271 call->service_id = sp->hdr.serviceId;
1272 } else {
1273 skew = 0;
1274 call = NULL;
1275 }
1276
1277 if (!call || atomic_read(&call->usage) == 0) {
1278 if (!(sp->hdr.type & RXRPC_CLIENT_INITIATED) ||
1279 sp->hdr.callNumber == 0 ||
1280 sp->hdr.type != RXRPC_PACKET_TYPE_DATA)
1281 goto bad_message_unlock;
1282 if (sp->hdr.seq != 1)
1283 goto discard_unlock;
1284 call = rxrpc_new_incoming_call(local, conn, skb);
1285 if (!call) {
1286 rcu_read_unlock();
1287 goto reject_packet;
1288 }
1289 rxrpc_send_ping(call, skb, skew);
1290 mutex_unlock(&call->user_mutex);
1291 }
1292
1293 rxrpc_input_call_packet(call, skb, skew);
1294 goto discard_unlock;
1295
1296 discard_unlock:
1297 rcu_read_unlock();
1298 discard:
1299 rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
1300 out:
1301 trace_rxrpc_rx_done(0, 0);
1302 return;
1303
1304 out_unlock:
1305 rcu_read_unlock();
1306 goto out;
1307
1308 wrong_security:
1309 rcu_read_unlock();
1310 trace_rxrpc_abort("SEC", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
1311 RXKADINCONSISTENCY, EBADMSG);
1312 skb->priority = RXKADINCONSISTENCY;
1313 goto post_abort;
1314
1315 reupgrade:
1316 rcu_read_unlock();
1317 trace_rxrpc_abort("UPG", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
1318 RX_PROTOCOL_ERROR, EBADMSG);
1319 goto protocol_error;
1320
1321 bad_message_unlock:
1322 rcu_read_unlock();
1323 bad_message:
1324 trace_rxrpc_abort("BAD", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
1325 RX_PROTOCOL_ERROR, EBADMSG);
1326 protocol_error:
1327 skb->priority = RX_PROTOCOL_ERROR;
1328 post_abort:
1329 skb->mark = RXRPC_SKB_MARK_LOCAL_ABORT;
1330 reject_packet:
1331 trace_rxrpc_rx_done(skb->mark, skb->priority);
1332 rxrpc_reject_packet(local, skb);
1333 _leave(" [badmsg]");
1334 }
Linux with added FPC-III support