blob: f8a699e929628d6293363092df50313f6ad5a8b2 [file] [log] [blame]
David Howells17926a72007-04-26 15:48:28 -07001/* 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>
Herbert Xu1781f7f2007-12-11 11:30:32 -080023#include <net/udp.h>
David Howells17926a72007-04-26 15:48:28 -070024#include "ar-internal.h"
25
26unsigned long rxrpc_ack_timeout = 1;
27
28const char *rxrpc_pkts[] = {
29 "?00",
30 "DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
31 "?09", "?10", "?11", "?12", "?13", "?14", "?15"
32};
33
34/*
35 * queue a packet for recvmsg to pass to userspace
36 * - the caller must hold a lock on call->lock
37 * - must not be called with interrupts disabled (sk_filter() disables BH's)
38 * - eats the packet whether successful or not
39 * - there must be just one reference to the packet, which the caller passes to
40 * this function
41 */
42int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb,
43 bool force, bool terminal)
44{
45 struct rxrpc_skb_priv *sp;
David Howells651350d2007-04-26 15:50:17 -070046 struct rxrpc_sock *rx = call->socket;
David Howells17926a72007-04-26 15:48:28 -070047 struct sock *sk;
48 int skb_len, ret;
49
50 _enter(",,%d,%d", force, terminal);
51
52 ASSERT(!irqs_disabled());
53
54 sp = rxrpc_skb(skb);
55 ASSERTCMP(sp->call, ==, call);
56
57 /* if we've already posted the terminal message for a call, then we
58 * don't post any more */
59 if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) {
60 _debug("already terminated");
61 ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE);
62 skb->destructor = NULL;
63 sp->call = NULL;
64 rxrpc_put_call(call);
65 rxrpc_free_skb(skb);
66 return 0;
67 }
68
David Howells651350d2007-04-26 15:50:17 -070069 sk = &rx->sk;
David Howells17926a72007-04-26 15:48:28 -070070
71 if (!force) {
72 /* cast skb->rcvbuf to unsigned... It's pointless, but
73 * reduces number of warnings when compiling with -W
74 * --ANK */
75// ret = -ENOBUFS;
76// if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
77// (unsigned) sk->sk_rcvbuf)
78// goto out;
79
80 ret = sk_filter(sk, skb);
81 if (ret < 0)
82 goto out;
83 }
84
85 spin_lock_bh(&sk->sk_receive_queue.lock);
86 if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) &&
87 !test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
88 call->socket->sk.sk_state != RXRPC_CLOSE) {
89 skb->destructor = rxrpc_packet_destructor;
90 skb->dev = NULL;
91 skb->sk = sk;
92 atomic_add(skb->truesize, &sk->sk_rmem_alloc);
93
David Howells17926a72007-04-26 15:48:28 -070094 if (terminal) {
95 _debug("<<<< TERMINAL MESSAGE >>>>");
96 set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags);
97 }
98
David Howells651350d2007-04-26 15:50:17 -070099 /* allow interception by a kernel service */
100 if (rx->interceptor) {
101 rx->interceptor(sk, call->user_call_ID, skb);
102 spin_unlock_bh(&sk->sk_receive_queue.lock);
103 } else {
104
105 /* Cache the SKB length before we tack it onto the
106 * receive queue. Once it is added it no longer
107 * belongs to us and may be freed by other threads of
108 * control pulling packets from the queue */
109 skb_len = skb->len;
110
111 _net("post skb %p", skb);
112 __skb_queue_tail(&sk->sk_receive_queue, skb);
113 spin_unlock_bh(&sk->sk_receive_queue.lock);
114
115 if (!sock_flag(sk, SOCK_DEAD))
116 sk->sk_data_ready(sk, skb_len);
117 }
David Howells17926a72007-04-26 15:48:28 -0700118 skb = NULL;
119 } else {
120 spin_unlock_bh(&sk->sk_receive_queue.lock);
121 }
122 ret = 0;
123
124out:
125 /* release the socket buffer */
126 if (skb) {
127 skb->destructor = NULL;
128 sp->call = NULL;
129 rxrpc_put_call(call);
130 rxrpc_free_skb(skb);
131 }
132
133 _leave(" = %d", ret);
134 return ret;
135}
136
137/*
138 * process a DATA packet, posting the packet to the appropriate queue
139 * - eats the packet if successful
140 */
141static int rxrpc_fast_process_data(struct rxrpc_call *call,
142 struct sk_buff *skb, u32 seq)
143{
144 struct rxrpc_skb_priv *sp;
145 bool terminal;
146 int ret, ackbit, ack;
147
148 _enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq);
149
150 sp = rxrpc_skb(skb);
151 ASSERTCMP(sp->call, ==, NULL);
152
153 spin_lock(&call->lock);
154
155 if (call->state > RXRPC_CALL_COMPLETE)
156 goto discard;
157
158 ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post);
159 ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv);
160 ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten);
161
162 if (seq < call->rx_data_post) {
163 _debug("dup #%u [-%u]", seq, call->rx_data_post);
164 ack = RXRPC_ACK_DUPLICATE;
165 ret = -ENOBUFS;
166 goto discard_and_ack;
167 }
168
169 /* we may already have the packet in the out of sequence queue */
170 ackbit = seq - (call->rx_data_eaten + 1);
171 ASSERTCMP(ackbit, >=, 0);
David S. Miller68c708f2007-04-26 20:20:21 -0700172 if (__test_and_set_bit(ackbit, call->ackr_window)) {
David Howells17926a72007-04-26 15:48:28 -0700173 _debug("dup oos #%u [%u,%u]",
174 seq, call->rx_data_eaten, call->rx_data_post);
175 ack = RXRPC_ACK_DUPLICATE;
176 goto discard_and_ack;
177 }
178
179 if (seq >= call->ackr_win_top) {
180 _debug("exceed #%u [%u]", seq, call->ackr_win_top);
David S. Miller68c708f2007-04-26 20:20:21 -0700181 __clear_bit(ackbit, call->ackr_window);
David Howells17926a72007-04-26 15:48:28 -0700182 ack = RXRPC_ACK_EXCEEDS_WINDOW;
183 goto discard_and_ack;
184 }
185
186 if (seq == call->rx_data_expect) {
187 clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags);
188 call->rx_data_expect++;
189 } else if (seq > call->rx_data_expect) {
190 _debug("oos #%u [%u]", seq, call->rx_data_expect);
191 call->rx_data_expect = seq + 1;
192 if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) {
193 ack = RXRPC_ACK_OUT_OF_SEQUENCE;
194 goto enqueue_and_ack;
195 }
196 goto enqueue_packet;
197 }
198
199 if (seq != call->rx_data_post) {
200 _debug("ahead #%u [%u]", seq, call->rx_data_post);
201 goto enqueue_packet;
202 }
203
204 if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags))
205 goto protocol_error;
206
207 /* if the packet need security things doing to it, then it goes down
208 * the slow path */
209 if (call->conn->security)
210 goto enqueue_packet;
211
212 sp->call = call;
213 rxrpc_get_call(call);
214 terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) &&
215 !(sp->hdr.flags & RXRPC_CLIENT_INITIATED));
216 ret = rxrpc_queue_rcv_skb(call, skb, false, terminal);
217 if (ret < 0) {
218 if (ret == -ENOMEM || ret == -ENOBUFS) {
David S. Miller68c708f2007-04-26 20:20:21 -0700219 __clear_bit(ackbit, call->ackr_window);
David Howells17926a72007-04-26 15:48:28 -0700220 ack = RXRPC_ACK_NOSPACE;
221 goto discard_and_ack;
222 }
223 goto out;
224 }
225
226 skb = NULL;
227
228 _debug("post #%u", seq);
229 ASSERTCMP(call->rx_data_post, ==, seq);
230 call->rx_data_post++;
231
232 if (sp->hdr.flags & RXRPC_LAST_PACKET)
233 set_bit(RXRPC_CALL_RCVD_LAST, &call->flags);
234
235 /* if we've reached an out of sequence packet then we need to drain
236 * that queue into the socket Rx queue now */
237 if (call->rx_data_post == call->rx_first_oos) {
238 _debug("drain rx oos now");
239 read_lock(&call->state_lock);
240 if (call->state < RXRPC_CALL_COMPLETE &&
241 !test_and_set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events))
David Howells651350d2007-04-26 15:50:17 -0700242 rxrpc_queue_call(call);
David Howells17926a72007-04-26 15:48:28 -0700243 read_unlock(&call->state_lock);
244 }
245
246 spin_unlock(&call->lock);
247 atomic_inc(&call->ackr_not_idle);
248 rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, sp->hdr.serial, false);
249 _leave(" = 0 [posted]");
250 return 0;
251
252protocol_error:
253 ret = -EBADMSG;
254out:
255 spin_unlock(&call->lock);
256 _leave(" = %d", ret);
257 return ret;
258
259discard_and_ack:
260 _debug("discard and ACK packet %p", skb);
261 __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true);
262discard:
263 spin_unlock(&call->lock);
264 rxrpc_free_skb(skb);
265 _leave(" = 0 [discarded]");
266 return 0;
267
268enqueue_and_ack:
269 __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true);
270enqueue_packet:
271 _net("defer skb %p", skb);
272 spin_unlock(&call->lock);
273 skb_queue_tail(&call->rx_queue, skb);
274 atomic_inc(&call->ackr_not_idle);
275 read_lock(&call->state_lock);
276 if (call->state < RXRPC_CALL_DEAD)
David Howells651350d2007-04-26 15:50:17 -0700277 rxrpc_queue_call(call);
David Howells17926a72007-04-26 15:48:28 -0700278 read_unlock(&call->state_lock);
279 _leave(" = 0 [queued]");
280 return 0;
281}
282
283/*
284 * assume an implicit ACKALL of the transmission phase of a client socket upon
285 * reception of the first reply packet
286 */
287static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial)
288{
289 write_lock_bh(&call->state_lock);
290
291 switch (call->state) {
292 case RXRPC_CALL_CLIENT_AWAIT_REPLY:
293 call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
294 call->acks_latest = serial;
295
296 _debug("implicit ACKALL %%%u", call->acks_latest);
297 set_bit(RXRPC_CALL_RCVD_ACKALL, &call->events);
298 write_unlock_bh(&call->state_lock);
299
300 if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
301 clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
302 clear_bit(RXRPC_CALL_RESEND, &call->events);
303 clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
304 }
305 break;
306
307 default:
308 write_unlock_bh(&call->state_lock);
309 break;
310 }
311}
312
313/*
314 * post an incoming packet to the nominated call to deal with
315 * - must get rid of the sk_buff, either by freeing it or by queuing it
316 */
317void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb)
318{
319 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
320 __be32 _abort_code;
321 u32 serial, hi_serial, seq, abort_code;
322
323 _enter("%p,%p", call, skb);
324
325 ASSERT(!irqs_disabled());
326
327#if 0 // INJECT RX ERROR
328 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
329 static int skip = 0;
330 if (++skip == 3) {
331 printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n");
332 skip = 0;
333 goto free_packet;
334 }
335 }
336#endif
337
338 /* track the latest serial number on this connection for ACK packet
339 * information */
340 serial = ntohl(sp->hdr.serial);
341 hi_serial = atomic_read(&call->conn->hi_serial);
342 while (serial > hi_serial)
343 hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial,
344 serial);
345
346 /* request ACK generation for any ACK or DATA packet that requests
347 * it */
348 if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
349 _proto("ACK Requested on %%%u", serial);
350 rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial,
351 !(sp->hdr.flags & RXRPC_MORE_PACKETS));
352 }
353
354 switch (sp->hdr.type) {
355 case RXRPC_PACKET_TYPE_ABORT:
356 _debug("abort");
357
358 if (skb_copy_bits(skb, 0, &_abort_code,
359 sizeof(_abort_code)) < 0)
360 goto protocol_error;
361
362 abort_code = ntohl(_abort_code);
363 _proto("Rx ABORT %%%u { %x }", serial, abort_code);
364
365 write_lock_bh(&call->state_lock);
366 if (call->state < RXRPC_CALL_COMPLETE) {
367 call->state = RXRPC_CALL_REMOTELY_ABORTED;
368 call->abort_code = abort_code;
369 set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
David Howells651350d2007-04-26 15:50:17 -0700370 rxrpc_queue_call(call);
David Howells17926a72007-04-26 15:48:28 -0700371 }
372 goto free_packet_unlock;
373
374 case RXRPC_PACKET_TYPE_BUSY:
375 _proto("Rx BUSY %%%u", serial);
376
377 if (call->conn->out_clientflag)
378 goto protocol_error;
379
380 write_lock_bh(&call->state_lock);
381 switch (call->state) {
382 case RXRPC_CALL_CLIENT_SEND_REQUEST:
383 call->state = RXRPC_CALL_SERVER_BUSY;
384 set_bit(RXRPC_CALL_RCVD_BUSY, &call->events);
David Howells651350d2007-04-26 15:50:17 -0700385 rxrpc_queue_call(call);
David Howells17926a72007-04-26 15:48:28 -0700386 case RXRPC_CALL_SERVER_BUSY:
387 goto free_packet_unlock;
388 default:
389 goto protocol_error_locked;
390 }
391
392 default:
393 _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], serial);
394 goto protocol_error;
395
396 case RXRPC_PACKET_TYPE_DATA:
397 seq = ntohl(sp->hdr.seq);
398
399 _proto("Rx DATA %%%u { #%u }", serial, seq);
400
401 if (seq == 0)
402 goto protocol_error;
403
404 call->ackr_prev_seq = sp->hdr.seq;
405
406 /* received data implicitly ACKs all of the request packets we
407 * sent when we're acting as a client */
408 if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
409 rxrpc_assume_implicit_ackall(call, serial);
410
411 switch (rxrpc_fast_process_data(call, skb, seq)) {
412 case 0:
413 skb = NULL;
414 goto done;
415
416 default:
417 BUG();
418
419 /* data packet received beyond the last packet */
420 case -EBADMSG:
421 goto protocol_error;
422 }
423
424 case RXRPC_PACKET_TYPE_ACK:
425 /* ACK processing is done in process context */
426 read_lock_bh(&call->state_lock);
427 if (call->state < RXRPC_CALL_DEAD) {
428 skb_queue_tail(&call->rx_queue, skb);
David Howells651350d2007-04-26 15:50:17 -0700429 rxrpc_queue_call(call);
David Howells17926a72007-04-26 15:48:28 -0700430 skb = NULL;
431 }
432 read_unlock_bh(&call->state_lock);
433 goto free_packet;
434 }
435
436protocol_error:
437 _debug("protocol error");
438 write_lock_bh(&call->state_lock);
439protocol_error_locked:
440 if (call->state <= RXRPC_CALL_COMPLETE) {
441 call->state = RXRPC_CALL_LOCALLY_ABORTED;
442 call->abort_code = RX_PROTOCOL_ERROR;
443 set_bit(RXRPC_CALL_ABORT, &call->events);
David Howells651350d2007-04-26 15:50:17 -0700444 rxrpc_queue_call(call);
David Howells17926a72007-04-26 15:48:28 -0700445 }
446free_packet_unlock:
447 write_unlock_bh(&call->state_lock);
448free_packet:
449 rxrpc_free_skb(skb);
450done:
451 _leave("");
452}
453
454/*
455 * split up a jumbo data packet
456 */
457static void rxrpc_process_jumbo_packet(struct rxrpc_call *call,
458 struct sk_buff *jumbo)
459{
460 struct rxrpc_jumbo_header jhdr;
461 struct rxrpc_skb_priv *sp;
462 struct sk_buff *part;
463
464 _enter(",{%u,%u}", jumbo->data_len, jumbo->len);
465
466 sp = rxrpc_skb(jumbo);
467
468 do {
469 sp->hdr.flags &= ~RXRPC_JUMBO_PACKET;
470
471 /* make a clone to represent the first subpacket in what's left
472 * of the jumbo packet */
473 part = skb_clone(jumbo, GFP_ATOMIC);
474 if (!part) {
475 /* simply ditch the tail in the event of ENOMEM */
476 pskb_trim(jumbo, RXRPC_JUMBO_DATALEN);
477 break;
478 }
479 rxrpc_new_skb(part);
480
481 pskb_trim(part, RXRPC_JUMBO_DATALEN);
482
483 if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN))
484 goto protocol_error;
485
486 if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0)
487 goto protocol_error;
488 if (!pskb_pull(jumbo, sizeof(jhdr)))
489 BUG();
490
491 sp->hdr.seq = htonl(ntohl(sp->hdr.seq) + 1);
492 sp->hdr.serial = htonl(ntohl(sp->hdr.serial) + 1);
493 sp->hdr.flags = jhdr.flags;
494 sp->hdr._rsvd = jhdr._rsvd;
495
496 _proto("Rx DATA Jumbo %%%u", ntohl(sp->hdr.serial) - 1);
497
498 rxrpc_fast_process_packet(call, part);
499 part = NULL;
500
501 } while (sp->hdr.flags & RXRPC_JUMBO_PACKET);
502
503 rxrpc_fast_process_packet(call, jumbo);
504 _leave("");
505 return;
506
507protocol_error:
508 _debug("protocol error");
509 rxrpc_free_skb(part);
510 rxrpc_free_skb(jumbo);
511 write_lock_bh(&call->state_lock);
512 if (call->state <= RXRPC_CALL_COMPLETE) {
513 call->state = RXRPC_CALL_LOCALLY_ABORTED;
514 call->abort_code = RX_PROTOCOL_ERROR;
515 set_bit(RXRPC_CALL_ABORT, &call->events);
David Howells651350d2007-04-26 15:50:17 -0700516 rxrpc_queue_call(call);
David Howells17926a72007-04-26 15:48:28 -0700517 }
518 write_unlock_bh(&call->state_lock);
519 _leave("");
520}
521
522/*
523 * post an incoming packet to the appropriate call/socket to deal with
524 * - must get rid of the sk_buff, either by freeing it or by queuing it
525 */
526static void rxrpc_post_packet_to_call(struct rxrpc_connection *conn,
527 struct sk_buff *skb)
528{
529 struct rxrpc_skb_priv *sp;
530 struct rxrpc_call *call;
531 struct rb_node *p;
532 __be32 call_id;
533
534 _enter("%p,%p", conn, skb);
535
536 read_lock_bh(&conn->lock);
537
538 sp = rxrpc_skb(skb);
539
540 /* look at extant calls by channel number first */
541 call = conn->channels[ntohl(sp->hdr.cid) & RXRPC_CHANNELMASK];
542 if (!call || call->call_id != sp->hdr.callNumber)
543 goto call_not_extant;
544
545 _debug("extant call [%d]", call->state);
546 ASSERTCMP(call->conn, ==, conn);
547
548 read_lock(&call->state_lock);
549 switch (call->state) {
550 case RXRPC_CALL_LOCALLY_ABORTED:
551 if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
David Howells651350d2007-04-26 15:50:17 -0700552 rxrpc_queue_call(call);
David Howells17926a72007-04-26 15:48:28 -0700553 case RXRPC_CALL_REMOTELY_ABORTED:
554 case RXRPC_CALL_NETWORK_ERROR:
555 case RXRPC_CALL_DEAD:
556 goto free_unlock;
557 default:
558 break;
559 }
560
561 read_unlock(&call->state_lock);
562 rxrpc_get_call(call);
563 read_unlock_bh(&conn->lock);
564
565 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
566 sp->hdr.flags & RXRPC_JUMBO_PACKET)
567 rxrpc_process_jumbo_packet(call, skb);
568 else
569 rxrpc_fast_process_packet(call, skb);
570
571 rxrpc_put_call(call);
572 goto done;
573
574call_not_extant:
575 /* search the completed calls in case what we're dealing with is
576 * there */
577 _debug("call not extant");
578
579 call_id = sp->hdr.callNumber;
580 p = conn->calls.rb_node;
581 while (p) {
582 call = rb_entry(p, struct rxrpc_call, conn_node);
583
584 if (call_id < call->call_id)
585 p = p->rb_left;
586 else if (call_id > call->call_id)
587 p = p->rb_right;
588 else
589 goto found_completed_call;
590 }
591
592dead_call:
593 /* it's a either a really old call that we no longer remember or its a
594 * new incoming call */
595 read_unlock_bh(&conn->lock);
596
597 if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
YOSHIFUJI Hideakiae445d12007-12-12 03:55:22 +0900598 sp->hdr.seq == cpu_to_be32(1)) {
David Howells17926a72007-04-26 15:48:28 -0700599 _debug("incoming call");
600 skb_queue_tail(&conn->trans->local->accept_queue, skb);
David Howells651350d2007-04-26 15:50:17 -0700601 rxrpc_queue_work(&conn->trans->local->acceptor);
David Howells17926a72007-04-26 15:48:28 -0700602 goto done;
603 }
604
605 _debug("dead call");
606 skb->priority = RX_CALL_DEAD;
607 rxrpc_reject_packet(conn->trans->local, skb);
608 goto done;
609
610 /* resend last packet of a completed call
611 * - client calls may have been aborted or ACK'd
612 * - server calls may have been aborted
613 */
614found_completed_call:
615 _debug("completed call");
616
617 if (atomic_read(&call->usage) == 0)
618 goto dead_call;
619
620 /* synchronise any state changes */
621 read_lock(&call->state_lock);
622 ASSERTIFCMP(call->state != RXRPC_CALL_CLIENT_FINAL_ACK,
623 call->state, >=, RXRPC_CALL_COMPLETE);
624
625 if (call->state == RXRPC_CALL_LOCALLY_ABORTED ||
626 call->state == RXRPC_CALL_REMOTELY_ABORTED ||
627 call->state == RXRPC_CALL_DEAD) {
628 read_unlock(&call->state_lock);
629 goto dead_call;
630 }
631
632 if (call->conn->in_clientflag) {
633 read_unlock(&call->state_lock);
634 goto dead_call; /* complete server call */
635 }
636
637 _debug("final ack again");
638 rxrpc_get_call(call);
639 set_bit(RXRPC_CALL_ACK_FINAL, &call->events);
David Howells651350d2007-04-26 15:50:17 -0700640 rxrpc_queue_call(call);
David Howells17926a72007-04-26 15:48:28 -0700641
642free_unlock:
643 read_unlock(&call->state_lock);
644 read_unlock_bh(&conn->lock);
645 rxrpc_free_skb(skb);
646done:
647 _leave("");
648}
649
650/*
651 * post connection-level events to the connection
652 * - this includes challenges, responses and some aborts
653 */
654static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
655 struct sk_buff *skb)
656{
657 _enter("%p,%p", conn, skb);
658
659 atomic_inc(&conn->usage);
660 skb_queue_tail(&conn->rx_queue, skb);
David Howells651350d2007-04-26 15:50:17 -0700661 rxrpc_queue_conn(conn);
David Howells17926a72007-04-26 15:48:28 -0700662}
663
664/*
665 * handle data received on the local endpoint
666 * - may be called in interrupt context
667 */
668void rxrpc_data_ready(struct sock *sk, int count)
669{
670 struct rxrpc_connection *conn;
671 struct rxrpc_transport *trans;
672 struct rxrpc_skb_priv *sp;
673 struct rxrpc_local *local;
674 struct rxrpc_peer *peer;
675 struct sk_buff *skb;
676 int ret;
677
678 _enter("%p, %d", sk, count);
679
680 ASSERT(!irqs_disabled());
681
682 read_lock_bh(&rxrpc_local_lock);
683 local = sk->sk_user_data;
684 if (local && atomic_read(&local->usage) > 0)
685 rxrpc_get_local(local);
686 else
687 local = NULL;
688 read_unlock_bh(&rxrpc_local_lock);
689 if (!local) {
690 _leave(" [local dead]");
691 return;
692 }
693
694 skb = skb_recv_datagram(sk, 0, 1, &ret);
695 if (!skb) {
696 rxrpc_put_local(local);
697 if (ret == -EAGAIN)
698 return;
699 _debug("UDP socket error %d", ret);
700 return;
701 }
702
703 rxrpc_new_skb(skb);
704
705 _net("recv skb %p", skb);
706
707 /* we'll probably need to checksum it (didn't call sock_recvmsg) */
708 if (skb_checksum_complete(skb)) {
709 rxrpc_free_skb(skb);
710 rxrpc_put_local(local);
Herbert Xu1781f7f2007-12-11 11:30:32 -0800711 UDP_INC_STATS_BH(UDP_MIB_INERRORS, 0);
David Howells17926a72007-04-26 15:48:28 -0700712 _leave(" [CSUM failed]");
713 return;
714 }
715
Herbert Xu1781f7f2007-12-11 11:30:32 -0800716 UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, 0);
717
David Howells17926a72007-04-26 15:48:28 -0700718 /* the socket buffer we have is owned by UDP, with UDP's data all over
719 * it, but we really want our own */
720 skb_orphan(skb);
721 sp = rxrpc_skb(skb);
722 memset(sp, 0, sizeof(*sp));
723
724 _net("Rx UDP packet from %08x:%04hu",
725 ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));
726
727 /* dig out the RxRPC connection details */
728 if (skb_copy_bits(skb, sizeof(struct udphdr), &sp->hdr,
729 sizeof(sp->hdr)) < 0)
730 goto bad_message;
731 if (!pskb_pull(skb, sizeof(struct udphdr) + sizeof(sp->hdr)))
732 BUG();
733
734 _net("Rx RxRPC %s ep=%x call=%x:%x",
735 sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
736 ntohl(sp->hdr.epoch),
737 ntohl(sp->hdr.cid),
738 ntohl(sp->hdr.callNumber));
739
740 if (sp->hdr.type == 0 || sp->hdr.type >= RXRPC_N_PACKET_TYPES) {
741 _proto("Rx Bad Packet Type %u", sp->hdr.type);
742 goto bad_message;
743 }
744
745 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
746 (sp->hdr.callNumber == 0 || sp->hdr.seq == 0))
747 goto bad_message;
748
749 peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr, udp_hdr(skb)->source);
750 if (IS_ERR(peer))
751 goto cant_route_call;
752
753 trans = rxrpc_find_transport(local, peer);
754 rxrpc_put_peer(peer);
755 if (!trans)
756 goto cant_route_call;
757
758 conn = rxrpc_find_connection(trans, &sp->hdr);
759 rxrpc_put_transport(trans);
760 if (!conn)
761 goto cant_route_call;
762
763 _debug("CONN %p {%d}", conn, conn->debug_id);
764
765 if (sp->hdr.callNumber == 0)
766 rxrpc_post_packet_to_conn(conn, skb);
767 else
768 rxrpc_post_packet_to_call(conn, skb);
769 rxrpc_put_connection(conn);
770 rxrpc_put_local(local);
771 return;
772
773cant_route_call:
774 _debug("can't route call");
775 if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
776 sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
YOSHIFUJI Hideakiae445d12007-12-12 03:55:22 +0900777 if (sp->hdr.seq == cpu_to_be32(1)) {
David Howells17926a72007-04-26 15:48:28 -0700778 _debug("first packet");
779 skb_queue_tail(&local->accept_queue, skb);
David Howells651350d2007-04-26 15:50:17 -0700780 rxrpc_queue_work(&local->acceptor);
David Howells17926a72007-04-26 15:48:28 -0700781 rxrpc_put_local(local);
782 _leave(" [incoming]");
783 return;
784 }
785 skb->priority = RX_INVALID_OPERATION;
786 } else {
787 skb->priority = RX_CALL_DEAD;
788 }
789
790 _debug("reject");
791 rxrpc_reject_packet(local, skb);
792 rxrpc_put_local(local);
793 _leave(" [no call]");
794 return;
795
796bad_message:
797 skb->priority = RX_PROTOCOL_ERROR;
798 rxrpc_reject_packet(local, skb);
799 rxrpc_put_local(local);
800 _leave(" [badmsg]");
801}