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-rw-r--r--net/rxrpc/ar-input.c797
1 files changed, 797 insertions, 0 deletions
diff --git a/net/rxrpc/ar-input.c b/net/rxrpc/ar-input.c
new file mode 100644
index 000000000000..91b5bbb003e2
--- /dev/null
+++ b/net/rxrpc/ar-input.c
@@ -0,0 +1,797 @@
1/* RxRPC packet 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/net.h>
14#include <linux/skbuff.h>
15#include <linux/errqueue.h>
16#include <linux/udp.h>
17#include <linux/in.h>
18#include <linux/in6.h>
19#include <linux/icmp.h>
20#include <net/sock.h>
21#include <net/af_rxrpc.h>
22#include <net/ip.h>
23#include "ar-internal.h"
24
25unsigned long rxrpc_ack_timeout = 1;
26
27const char *rxrpc_pkts[] = {
28 "?00",
29 "DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
30 "?09", "?10", "?11", "?12", "?13", "?14", "?15"
31};
32
33/*
34 * queue a packet for recvmsg to pass to userspace
35 * - the caller must hold a lock on call->lock
36 * - must not be called with interrupts disabled (sk_filter() disables BH's)
37 * - eats the packet whether successful or not
38 * - there must be just one reference to the packet, which the caller passes to
39 * this function
40 */
41int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb,
42 bool force, bool terminal)
43{
44 struct rxrpc_skb_priv *sp;
45 struct rxrpc_sock *rx = call->socket;
46 struct sock *sk;
47 int skb_len, ret;
48
49 _enter(",,%d,%d", force, terminal);
50
51 ASSERT(!irqs_disabled());
52
53 sp = rxrpc_skb(skb);
54 ASSERTCMP(sp->call, ==, call);
55
56 /* if we've already posted the terminal message for a call, then we
57 * don't post any more */
58 if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) {
59 _debug("already terminated");
60 ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE);
61 skb->destructor = NULL;
62 sp->call = NULL;
63 rxrpc_put_call(call);
64 rxrpc_free_skb(skb);
65 return 0;
66 }
67
68 sk = &rx->sk;
69
70 if (!force) {
71 /* cast skb->rcvbuf to unsigned... It's pointless, but
72 * reduces number of warnings when compiling with -W
73 * --ANK */
74// ret = -ENOBUFS;
75// if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
76// (unsigned) sk->sk_rcvbuf)
77// goto out;
78
79 ret = sk_filter(sk, skb);
80 if (ret < 0)
81 goto out;
82 }
83
84 spin_lock_bh(&sk->sk_receive_queue.lock);
85 if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) &&
86 !test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
87 call->socket->sk.sk_state != RXRPC_CLOSE) {
88 skb->destructor = rxrpc_packet_destructor;
89 skb->dev = NULL;
90 skb->sk = sk;
91 atomic_add(skb->truesize, &sk->sk_rmem_alloc);
92
93 if (terminal) {
94 _debug("<<<< TERMINAL MESSAGE >>>>");
95 set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags);
96 }
97
98 /* allow interception by a kernel service */
99 if (rx->interceptor) {
100 rx->interceptor(sk, call->user_call_ID, skb);
101 spin_unlock_bh(&sk->sk_receive_queue.lock);
102 } else {
103
104 /* Cache the SKB length before we tack it onto the
105 * receive queue. Once it is added it no longer
106 * belongs to us and may be freed by other threads of
107 * control pulling packets from the queue */
108 skb_len = skb->len;
109
110 _net("post skb %p", skb);
111 __skb_queue_tail(&sk->sk_receive_queue, skb);
112 spin_unlock_bh(&sk->sk_receive_queue.lock);
113
114 if (!sock_flag(sk, SOCK_DEAD))
115 sk->sk_data_ready(sk, skb_len);
116 }
117 skb = NULL;
118 } else {
119 spin_unlock_bh(&sk->sk_receive_queue.lock);
120 }
121 ret = 0;
122
123out:
124 /* release the socket buffer */
125 if (skb) {
126 skb->destructor = NULL;
127 sp->call = NULL;
128 rxrpc_put_call(call);
129 rxrpc_free_skb(skb);
130 }
131
132 _leave(" = %d", ret);
133 return ret;
134}
135
136/*
137 * process a DATA packet, posting the packet to the appropriate queue
138 * - eats the packet if successful
139 */
140static int rxrpc_fast_process_data(struct rxrpc_call *call,
141 struct sk_buff *skb, u32 seq)
142{
143 struct rxrpc_skb_priv *sp;
144 bool terminal;
145 int ret, ackbit, ack;
146
147 _enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq);
148
149 sp = rxrpc_skb(skb);
150 ASSERTCMP(sp->call, ==, NULL);
151
152 spin_lock(&call->lock);
153
154 if (call->state > RXRPC_CALL_COMPLETE)
155 goto discard;
156
157 ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post);
158 ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv);
159 ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten);
160
161 if (seq < call->rx_data_post) {
162 _debug("dup #%u [-%u]", seq, call->rx_data_post);
163 ack = RXRPC_ACK_DUPLICATE;
164 ret = -ENOBUFS;
165 goto discard_and_ack;
166 }
167
168 /* we may already have the packet in the out of sequence queue */
169 ackbit = seq - (call->rx_data_eaten + 1);
170 ASSERTCMP(ackbit, >=, 0);
171 if (__test_and_set_bit(ackbit, call->ackr_window)) {
172 _debug("dup oos #%u [%u,%u]",
173 seq, call->rx_data_eaten, call->rx_data_post);
174 ack = RXRPC_ACK_DUPLICATE;
175 goto discard_and_ack;
176 }
177
178 if (seq >= call->ackr_win_top) {
179 _debug("exceed #%u [%u]", seq, call->ackr_win_top);
180 __clear_bit(ackbit, call->ackr_window);
181 ack = RXRPC_ACK_EXCEEDS_WINDOW;
182 goto discard_and_ack;
183 }
184
185 if (seq == call->rx_data_expect) {
186 clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags);
187 call->rx_data_expect++;
188 } else if (seq > call->rx_data_expect) {
189 _debug("oos #%u [%u]", seq, call->rx_data_expect);
190 call->rx_data_expect = seq + 1;
191 if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) {
192 ack = RXRPC_ACK_OUT_OF_SEQUENCE;
193 goto enqueue_and_ack;
194 }
195 goto enqueue_packet;
196 }
197
198 if (seq != call->rx_data_post) {
199 _debug("ahead #%u [%u]", seq, call->rx_data_post);
200 goto enqueue_packet;
201 }
202
203 if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags))
204 goto protocol_error;
205
206 /* if the packet need security things doing to it, then it goes down
207 * the slow path */
208 if (call->conn->security)
209 goto enqueue_packet;
210
211 sp->call = call;
212 rxrpc_get_call(call);
213 terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) &&
214 !(sp->hdr.flags & RXRPC_CLIENT_INITIATED));
215 ret = rxrpc_queue_rcv_skb(call, skb, false, terminal);
216 if (ret < 0) {
217 if (ret == -ENOMEM || ret == -ENOBUFS) {
218 __clear_bit(ackbit, call->ackr_window);
219 ack = RXRPC_ACK_NOSPACE;
220 goto discard_and_ack;
221 }
222 goto out;
223 }
224
225 skb = NULL;
226
227 _debug("post #%u", seq);
228 ASSERTCMP(call->rx_data_post, ==, seq);
229 call->rx_data_post++;
230
231 if (sp->hdr.flags & RXRPC_LAST_PACKET)
232 set_bit(RXRPC_CALL_RCVD_LAST, &call->flags);
233
234 /* if we've reached an out of sequence packet then we need to drain
235 * that queue into the socket Rx queue now */
236 if (call->rx_data_post == call->rx_first_oos) {
237 _debug("drain rx oos now");
238 read_lock(&call->state_lock);
239 if (call->state < RXRPC_CALL_COMPLETE &&
240 !test_and_set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events))
241 rxrpc_queue_call(call);
242 read_unlock(&call->state_lock);
243 }
244
245 spin_unlock(&call->lock);
246 atomic_inc(&call->ackr_not_idle);
247 rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, sp->hdr.serial, false);
248 _leave(" = 0 [posted]");
249 return 0;
250
251protocol_error:
252 ret = -EBADMSG;
253out:
254 spin_unlock(&call->lock);
255 _leave(" = %d", ret);
256 return ret;
257
258discard_and_ack:
259 _debug("discard and ACK packet %p", skb);
260 __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true);
261discard:
262 spin_unlock(&call->lock);
263 rxrpc_free_skb(skb);
264 _leave(" = 0 [discarded]");
265 return 0;
266
267enqueue_and_ack:
268 __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true);
269enqueue_packet:
270 _net("defer skb %p", skb);
271 spin_unlock(&call->lock);
272 skb_queue_tail(&call->rx_queue, skb);
273 atomic_inc(&call->ackr_not_idle);
274 read_lock(&call->state_lock);
275 if (call->state < RXRPC_CALL_DEAD)
276 rxrpc_queue_call(call);
277 read_unlock(&call->state_lock);
278 _leave(" = 0 [queued]");
279 return 0;
280}
281
282/*
283 * assume an implicit ACKALL of the transmission phase of a client socket upon
284 * reception of the first reply packet
285 */
286static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial)
287{
288 write_lock_bh(&call->state_lock);
289
290 switch (call->state) {
291 case RXRPC_CALL_CLIENT_AWAIT_REPLY:
292 call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
293 call->acks_latest = serial;
294
295 _debug("implicit ACKALL %%%u", call->acks_latest);
296 set_bit(RXRPC_CALL_RCVD_ACKALL, &call->events);
297 write_unlock_bh(&call->state_lock);
298
299 if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
300 clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
301 clear_bit(RXRPC_CALL_RESEND, &call->events);
302 clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
303 }
304 break;
305
306 default:
307 write_unlock_bh(&call->state_lock);
308 break;
309 }
310}
311
312/*
313 * post an incoming packet to the nominated call to deal with
314 * - must get rid of the sk_buff, either by freeing it or by queuing it
315 */
316void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb)
317{
318 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
319 __be32 _abort_code;
320 u32 serial, hi_serial, seq, abort_code;
321
322 _enter("%p,%p", call, skb);
323
324 ASSERT(!irqs_disabled());
325
326#if 0 // INJECT RX ERROR
327 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
328 static int skip = 0;
329 if (++skip == 3) {
330 printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n");
331 skip = 0;
332 goto free_packet;
333 }
334 }
335#endif
336
337 /* track the latest serial number on this connection for ACK packet
338 * information */
339 serial = ntohl(sp->hdr.serial);
340 hi_serial = atomic_read(&call->conn->hi_serial);
341 while (serial > hi_serial)
342 hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial,
343 serial);
344
345 /* request ACK generation for any ACK or DATA packet that requests
346 * it */
347 if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
348 _proto("ACK Requested on %%%u", serial);
349 rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial,
350 !(sp->hdr.flags & RXRPC_MORE_PACKETS));
351 }
352
353 switch (sp->hdr.type) {
354 case RXRPC_PACKET_TYPE_ABORT:
355 _debug("abort");
356
357 if (skb_copy_bits(skb, 0, &_abort_code,
358 sizeof(_abort_code)) < 0)
359 goto protocol_error;
360
361 abort_code = ntohl(_abort_code);
362 _proto("Rx ABORT %%%u { %x }", serial, abort_code);
363
364 write_lock_bh(&call->state_lock);
365 if (call->state < RXRPC_CALL_COMPLETE) {
366 call->state = RXRPC_CALL_REMOTELY_ABORTED;
367 call->abort_code = abort_code;
368 set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
369 rxrpc_queue_call(call);
370 }
371 goto free_packet_unlock;
372
373 case RXRPC_PACKET_TYPE_BUSY:
374 _proto("Rx BUSY %%%u", serial);
375
376 if (call->conn->out_clientflag)
377 goto protocol_error;
378
379 write_lock_bh(&call->state_lock);
380 switch (call->state) {
381 case RXRPC_CALL_CLIENT_SEND_REQUEST:
382 call->state = RXRPC_CALL_SERVER_BUSY;
383 set_bit(RXRPC_CALL_RCVD_BUSY, &call->events);
384 rxrpc_queue_call(call);
385 case RXRPC_CALL_SERVER_BUSY:
386 goto free_packet_unlock;
387 default:
388 goto protocol_error_locked;
389 }
390
391 default:
392 _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], serial);
393 goto protocol_error;
394
395 case RXRPC_PACKET_TYPE_DATA:
396 seq = ntohl(sp->hdr.seq);
397
398 _proto("Rx DATA %%%u { #%u }", serial, seq);
399
400 if (seq == 0)
401 goto protocol_error;
402
403 call->ackr_prev_seq = sp->hdr.seq;
404
405 /* received data implicitly ACKs all of the request packets we
406 * sent when we're acting as a client */
407 if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
408 rxrpc_assume_implicit_ackall(call, serial);
409
410 switch (rxrpc_fast_process_data(call, skb, seq)) {
411 case 0:
412 skb = NULL;
413 goto done;
414
415 default:
416 BUG();
417
418 /* data packet received beyond the last packet */
419 case -EBADMSG:
420 goto protocol_error;
421 }
422
423 case RXRPC_PACKET_TYPE_ACK:
424 /* ACK processing is done in process context */
425 read_lock_bh(&call->state_lock);
426 if (call->state < RXRPC_CALL_DEAD) {
427 skb_queue_tail(&call->rx_queue, skb);
428 rxrpc_queue_call(call);
429 skb = NULL;
430 }
431 read_unlock_bh(&call->state_lock);
432 goto free_packet;
433 }
434
435protocol_error:
436 _debug("protocol error");
437 write_lock_bh(&call->state_lock);
438protocol_error_locked:
439 if (call->state <= RXRPC_CALL_COMPLETE) {
440 call->state = RXRPC_CALL_LOCALLY_ABORTED;
441 call->abort_code = RX_PROTOCOL_ERROR;
442 set_bit(RXRPC_CALL_ABORT, &call->events);
443 rxrpc_queue_call(call);
444 }
445free_packet_unlock:
446 write_unlock_bh(&call->state_lock);
447free_packet:
448 rxrpc_free_skb(skb);
449done:
450 _leave("");
451}
452
453/*
454 * split up a jumbo data packet
455 */
456static void rxrpc_process_jumbo_packet(struct rxrpc_call *call,
457 struct sk_buff *jumbo)
458{
459 struct rxrpc_jumbo_header jhdr;
460 struct rxrpc_skb_priv *sp;
461 struct sk_buff *part;
462
463 _enter(",{%u,%u}", jumbo->data_len, jumbo->len);
464
465 sp = rxrpc_skb(jumbo);
466
467 do {
468 sp->hdr.flags &= ~RXRPC_JUMBO_PACKET;
469
470 /* make a clone to represent the first subpacket in what's left
471 * of the jumbo packet */
472 part = skb_clone(jumbo, GFP_ATOMIC);
473 if (!part) {
474 /* simply ditch the tail in the event of ENOMEM */
475 pskb_trim(jumbo, RXRPC_JUMBO_DATALEN);
476 break;
477 }
478 rxrpc_new_skb(part);
479
480 pskb_trim(part, RXRPC_JUMBO_DATALEN);
481
482 if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN))
483 goto protocol_error;
484
485 if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0)
486 goto protocol_error;
487 if (!pskb_pull(jumbo, sizeof(jhdr)))
488 BUG();
489
490 sp->hdr.seq = htonl(ntohl(sp->hdr.seq) + 1);
491 sp->hdr.serial = htonl(ntohl(sp->hdr.serial) + 1);
492 sp->hdr.flags = jhdr.flags;
493 sp->hdr._rsvd = jhdr._rsvd;
494
495 _proto("Rx DATA Jumbo %%%u", ntohl(sp->hdr.serial) - 1);
496
497 rxrpc_fast_process_packet(call, part);
498 part = NULL;
499
500 } while (sp->hdr.flags & RXRPC_JUMBO_PACKET);
501
502 rxrpc_fast_process_packet(call, jumbo);
503 _leave("");
504 return;
505
506protocol_error:
507 _debug("protocol error");
508 rxrpc_free_skb(part);
509 rxrpc_free_skb(jumbo);
510 write_lock_bh(&call->state_lock);
511 if (call->state <= RXRPC_CALL_COMPLETE) {
512 call->state = RXRPC_CALL_LOCALLY_ABORTED;
513 call->abort_code = RX_PROTOCOL_ERROR;
514 set_bit(RXRPC_CALL_ABORT, &call->events);
515 rxrpc_queue_call(call);
516 }
517 write_unlock_bh(&call->state_lock);
518 _leave("");
519}
520
521/*
522 * post an incoming packet to the appropriate call/socket to deal with
523 * - must get rid of the sk_buff, either by freeing it or by queuing it
524 */
525static void rxrpc_post_packet_to_call(struct rxrpc_connection *conn,
526 struct sk_buff *skb)
527{
528 struct rxrpc_skb_priv *sp;
529 struct rxrpc_call *call;
530 struct rb_node *p;
531 __be32 call_id;
532
533 _enter("%p,%p", conn, skb);
534
535 read_lock_bh(&conn->lock);
536
537 sp = rxrpc_skb(skb);
538
539 /* look at extant calls by channel number first */
540 call = conn->channels[ntohl(sp->hdr.cid) & RXRPC_CHANNELMASK];
541 if (!call || call->call_id != sp->hdr.callNumber)
542 goto call_not_extant;
543
544 _debug("extant call [%d]", call->state);
545 ASSERTCMP(call->conn, ==, conn);
546
547 read_lock(&call->state_lock);
548 switch (call->state) {
549 case RXRPC_CALL_LOCALLY_ABORTED:
550 if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
551 rxrpc_queue_call(call);
552 case RXRPC_CALL_REMOTELY_ABORTED:
553 case RXRPC_CALL_NETWORK_ERROR:
554 case RXRPC_CALL_DEAD:
555 goto free_unlock;
556 default:
557 break;
558 }
559
560 read_unlock(&call->state_lock);
561 rxrpc_get_call(call);
562 read_unlock_bh(&conn->lock);
563
564 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
565 sp->hdr.flags & RXRPC_JUMBO_PACKET)
566 rxrpc_process_jumbo_packet(call, skb);
567 else
568 rxrpc_fast_process_packet(call, skb);
569
570 rxrpc_put_call(call);
571 goto done;
572
573call_not_extant:
574 /* search the completed calls in case what we're dealing with is
575 * there */
576 _debug("call not extant");
577
578 call_id = sp->hdr.callNumber;
579 p = conn->calls.rb_node;
580 while (p) {
581 call = rb_entry(p, struct rxrpc_call, conn_node);
582
583 if (call_id < call->call_id)
584 p = p->rb_left;
585 else if (call_id > call->call_id)
586 p = p->rb_right;
587 else
588 goto found_completed_call;
589 }
590
591dead_call:
592 /* it's a either a really old call that we no longer remember or its a
593 * new incoming call */
594 read_unlock_bh(&conn->lock);
595
596 if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
597 sp->hdr.seq == __constant_cpu_to_be32(1)) {
598 _debug("incoming call");
599 skb_queue_tail(&conn->trans->local->accept_queue, skb);
600 rxrpc_queue_work(&conn->trans->local->acceptor);
601 goto done;
602 }
603
604 _debug("dead call");
605 skb->priority = RX_CALL_DEAD;
606 rxrpc_reject_packet(conn->trans->local, skb);
607 goto done;
608
609 /* resend last packet of a completed call
610 * - client calls may have been aborted or ACK'd
611 * - server calls may have been aborted
612 */
613found_completed_call:
614 _debug("completed call");
615
616 if (atomic_read(&call->usage) == 0)
617 goto dead_call;
618
619 /* synchronise any state changes */
620 read_lock(&call->state_lock);
621 ASSERTIFCMP(call->state != RXRPC_CALL_CLIENT_FINAL_ACK,
622 call->state, >=, RXRPC_CALL_COMPLETE);
623
624 if (call->state == RXRPC_CALL_LOCALLY_ABORTED ||
625 call->state == RXRPC_CALL_REMOTELY_ABORTED ||
626 call->state == RXRPC_CALL_DEAD) {
627 read_unlock(&call->state_lock);
628 goto dead_call;
629 }
630
631 if (call->conn->in_clientflag) {
632 read_unlock(&call->state_lock);
633 goto dead_call; /* complete server call */
634 }
635
636 _debug("final ack again");
637 rxrpc_get_call(call);
638 set_bit(RXRPC_CALL_ACK_FINAL, &call->events);
639 rxrpc_queue_call(call);
640
641free_unlock:
642 read_unlock(&call->state_lock);
643 read_unlock_bh(&conn->lock);
644 rxrpc_free_skb(skb);
645done:
646 _leave("");
647}
648
649/*
650 * post connection-level events to the connection
651 * - this includes challenges, responses and some aborts
652 */
653static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
654 struct sk_buff *skb)
655{
656 _enter("%p,%p", conn, skb);
657
658 atomic_inc(&conn->usage);
659 skb_queue_tail(&conn->rx_queue, skb);
660 rxrpc_queue_conn(conn);
661}
662
663/*
664 * handle data received on the local endpoint
665 * - may be called in interrupt context
666 */
667void rxrpc_data_ready(struct sock *sk, int count)
668{
669 struct rxrpc_connection *conn;
670 struct rxrpc_transport *trans;
671 struct rxrpc_skb_priv *sp;
672 struct rxrpc_local *local;
673 struct rxrpc_peer *peer;
674 struct sk_buff *skb;
675 int ret;
676
677 _enter("%p, %d", sk, count);
678
679 ASSERT(!irqs_disabled());
680
681 read_lock_bh(&rxrpc_local_lock);
682 local = sk->sk_user_data;
683 if (local && atomic_read(&local->usage) > 0)
684 rxrpc_get_local(local);
685 else
686 local = NULL;
687 read_unlock_bh(&rxrpc_local_lock);
688 if (!local) {
689 _leave(" [local dead]");
690 return;
691 }
692
693 skb = skb_recv_datagram(sk, 0, 1, &ret);
694 if (!skb) {
695 rxrpc_put_local(local);
696 if (ret == -EAGAIN)
697 return;
698 _debug("UDP socket error %d", ret);
699 return;
700 }
701
702 rxrpc_new_skb(skb);
703
704 _net("recv skb %p", skb);
705
706 /* we'll probably need to checksum it (didn't call sock_recvmsg) */
707 if (skb_checksum_complete(skb)) {
708 rxrpc_free_skb(skb);
709 rxrpc_put_local(local);
710 _leave(" [CSUM failed]");
711 return;
712 }
713
714 /* the socket buffer we have is owned by UDP, with UDP's data all over
715 * it, but we really want our own */
716 skb_orphan(skb);
717 sp = rxrpc_skb(skb);
718 memset(sp, 0, sizeof(*sp));
719
720 _net("Rx UDP packet from %08x:%04hu",
721 ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));
722
723 /* dig out the RxRPC connection details */
724 if (skb_copy_bits(skb, sizeof(struct udphdr), &sp->hdr,
725 sizeof(sp->hdr)) < 0)
726 goto bad_message;
727 if (!pskb_pull(skb, sizeof(struct udphdr) + sizeof(sp->hdr)))
728 BUG();
729
730 _net("Rx RxRPC %s ep=%x call=%x:%x",
731 sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
732 ntohl(sp->hdr.epoch),
733 ntohl(sp->hdr.cid),
734 ntohl(sp->hdr.callNumber));
735
736 if (sp->hdr.type == 0 || sp->hdr.type >= RXRPC_N_PACKET_TYPES) {
737 _proto("Rx Bad Packet Type %u", sp->hdr.type);
738 goto bad_message;
739 }
740
741 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
742 (sp->hdr.callNumber == 0 || sp->hdr.seq == 0))
743 goto bad_message;
744
745 peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr, udp_hdr(skb)->source);
746 if (IS_ERR(peer))
747 goto cant_route_call;
748
749 trans = rxrpc_find_transport(local, peer);
750 rxrpc_put_peer(peer);
751 if (!trans)
752 goto cant_route_call;
753
754 conn = rxrpc_find_connection(trans, &sp->hdr);
755 rxrpc_put_transport(trans);
756 if (!conn)
757 goto cant_route_call;
758
759 _debug("CONN %p {%d}", conn, conn->debug_id);
760
761 if (sp->hdr.callNumber == 0)
762 rxrpc_post_packet_to_conn(conn, skb);
763 else
764 rxrpc_post_packet_to_call(conn, skb);
765 rxrpc_put_connection(conn);
766 rxrpc_put_local(local);
767 return;
768
769cant_route_call:
770 _debug("can't route call");
771 if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
772 sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
773 if (sp->hdr.seq == __constant_cpu_to_be32(1)) {
774 _debug("first packet");
775 skb_queue_tail(&local->accept_queue, skb);
776 rxrpc_queue_work(&local->acceptor);
777 rxrpc_put_local(local);
778 _leave(" [incoming]");
779 return;
780 }
781 skb->priority = RX_INVALID_OPERATION;
782 } else {
783 skb->priority = RX_CALL_DEAD;
784 }
785
786 _debug("reject");
787 rxrpc_reject_packet(local, skb);
788 rxrpc_put_local(local);
789 _leave(" [no call]");
790 return;
791
792bad_message:
793 skb->priority = RX_PROTOCOL_ERROR;
794 rxrpc_reject_packet(local, skb);
795 rxrpc_put_local(local);
796 _leave(" [badmsg]");
797}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-22 23:47:08 -0500