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17926a79 DH |
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 | ||
25 | unsigned long rxrpc_ack_timeout = 1; | |
26 | ||
27 | const 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 | */ | |
41 | int 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 sock *sk; | |
46 | int skb_len, ret; | |
47 | ||
48 | _enter(",,%d,%d", force, terminal); | |
49 | ||
50 | ASSERT(!irqs_disabled()); | |
51 | ||
52 | sp = rxrpc_skb(skb); | |
53 | ASSERTCMP(sp->call, ==, call); | |
54 | ||
55 | /* if we've already posted the terminal message for a call, then we | |
56 | * don't post any more */ | |
57 | if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { | |
58 | _debug("already terminated"); | |
59 | ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE); | |
60 | skb->destructor = NULL; | |
61 | sp->call = NULL; | |
62 | rxrpc_put_call(call); | |
63 | rxrpc_free_skb(skb); | |
64 | return 0; | |
65 | } | |
66 | ||
67 | sk = &call->socket->sk; | |
68 | ||
69 | if (!force) { | |
70 | /* cast skb->rcvbuf to unsigned... It's pointless, but | |
71 | * reduces number of warnings when compiling with -W | |
72 | * --ANK */ | |
73 | // ret = -ENOBUFS; | |
74 | // if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
75 | // (unsigned) sk->sk_rcvbuf) | |
76 | // goto out; | |
77 | ||
78 | ret = sk_filter(sk, skb); | |
79 | if (ret < 0) | |
80 | goto out; | |
81 | } | |
82 | ||
83 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
84 | if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) && | |
85 | !test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
86 | call->socket->sk.sk_state != RXRPC_CLOSE) { | |
87 | skb->destructor = rxrpc_packet_destructor; | |
88 | skb->dev = NULL; | |
89 | skb->sk = sk; | |
90 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
91 | ||
92 | /* Cache the SKB length before we tack it onto the receive | |
93 | * queue. Once it is added it no longer belongs to us and | |
94 | * may be freed by other threads of control pulling packets | |
95 | * from the queue. | |
96 | */ | |
97 | skb_len = skb->len; | |
98 | ||
99 | _net("post skb %p", skb); | |
100 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
101 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
102 | ||
103 | if (!sock_flag(sk, SOCK_DEAD)) | |
104 | sk->sk_data_ready(sk, skb_len); | |
105 | ||
106 | if (terminal) { | |
107 | _debug("<<<< TERMINAL MESSAGE >>>>"); | |
108 | set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags); | |
109 | } | |
110 | ||
111 | skb = NULL; | |
112 | } else { | |
113 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
114 | } | |
115 | ret = 0; | |
116 | ||
117 | out: | |
118 | /* release the socket buffer */ | |
119 | if (skb) { | |
120 | skb->destructor = NULL; | |
121 | sp->call = NULL; | |
122 | rxrpc_put_call(call); | |
123 | rxrpc_free_skb(skb); | |
124 | } | |
125 | ||
126 | _leave(" = %d", ret); | |
127 | return ret; | |
128 | } | |
129 | ||
130 | /* | |
131 | * process a DATA packet, posting the packet to the appropriate queue | |
132 | * - eats the packet if successful | |
133 | */ | |
134 | static int rxrpc_fast_process_data(struct rxrpc_call *call, | |
135 | struct sk_buff *skb, u32 seq) | |
136 | { | |
137 | struct rxrpc_skb_priv *sp; | |
138 | bool terminal; | |
139 | int ret, ackbit, ack; | |
140 | ||
141 | _enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq); | |
142 | ||
143 | sp = rxrpc_skb(skb); | |
144 | ASSERTCMP(sp->call, ==, NULL); | |
145 | ||
146 | spin_lock(&call->lock); | |
147 | ||
148 | if (call->state > RXRPC_CALL_COMPLETE) | |
149 | goto discard; | |
150 | ||
151 | ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post); | |
152 | ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv); | |
153 | ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten); | |
154 | ||
155 | if (seq < call->rx_data_post) { | |
156 | _debug("dup #%u [-%u]", seq, call->rx_data_post); | |
157 | ack = RXRPC_ACK_DUPLICATE; | |
158 | ret = -ENOBUFS; | |
159 | goto discard_and_ack; | |
160 | } | |
161 | ||
162 | /* we may already have the packet in the out of sequence queue */ | |
163 | ackbit = seq - (call->rx_data_eaten + 1); | |
164 | ASSERTCMP(ackbit, >=, 0); | |
165 | if (__test_and_set_bit(ackbit, &call->ackr_window)) { | |
166 | _debug("dup oos #%u [%u,%u]", | |
167 | seq, call->rx_data_eaten, call->rx_data_post); | |
168 | ack = RXRPC_ACK_DUPLICATE; | |
169 | goto discard_and_ack; | |
170 | } | |
171 | ||
172 | if (seq >= call->ackr_win_top) { | |
173 | _debug("exceed #%u [%u]", seq, call->ackr_win_top); | |
174 | __clear_bit(ackbit, &call->ackr_window); | |
175 | ack = RXRPC_ACK_EXCEEDS_WINDOW; | |
176 | goto discard_and_ack; | |
177 | } | |
178 | ||
179 | if (seq == call->rx_data_expect) { | |
180 | clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags); | |
181 | call->rx_data_expect++; | |
182 | } else if (seq > call->rx_data_expect) { | |
183 | _debug("oos #%u [%u]", seq, call->rx_data_expect); | |
184 | call->rx_data_expect = seq + 1; | |
185 | if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) { | |
186 | ack = RXRPC_ACK_OUT_OF_SEQUENCE; | |
187 | goto enqueue_and_ack; | |
188 | } | |
189 | goto enqueue_packet; | |
190 | } | |
191 | ||
192 | if (seq != call->rx_data_post) { | |
193 | _debug("ahead #%u [%u]", seq, call->rx_data_post); | |
194 | goto enqueue_packet; | |
195 | } | |
196 | ||
197 | if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags)) | |
198 | goto protocol_error; | |
199 | ||
200 | /* if the packet need security things doing to it, then it goes down | |
201 | * the slow path */ | |
202 | if (call->conn->security) | |
203 | goto enqueue_packet; | |
204 | ||
205 | sp->call = call; | |
206 | rxrpc_get_call(call); | |
207 | terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && | |
208 | !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); | |
209 | ret = rxrpc_queue_rcv_skb(call, skb, false, terminal); | |
210 | if (ret < 0) { | |
211 | if (ret == -ENOMEM || ret == -ENOBUFS) { | |
212 | __clear_bit(ackbit, &call->ackr_window); | |
213 | ack = RXRPC_ACK_NOSPACE; | |
214 | goto discard_and_ack; | |
215 | } | |
216 | goto out; | |
217 | } | |
218 | ||
219 | skb = NULL; | |
220 | ||
221 | _debug("post #%u", seq); | |
222 | ASSERTCMP(call->rx_data_post, ==, seq); | |
223 | call->rx_data_post++; | |
224 | ||
225 | if (sp->hdr.flags & RXRPC_LAST_PACKET) | |
226 | set_bit(RXRPC_CALL_RCVD_LAST, &call->flags); | |
227 | ||
228 | /* if we've reached an out of sequence packet then we need to drain | |
229 | * that queue into the socket Rx queue now */ | |
230 | if (call->rx_data_post == call->rx_first_oos) { | |
231 | _debug("drain rx oos now"); | |
232 | read_lock(&call->state_lock); | |
233 | if (call->state < RXRPC_CALL_COMPLETE && | |
234 | !test_and_set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events)) | |
235 | schedule_work(&call->processor); | |
236 | read_unlock(&call->state_lock); | |
237 | } | |
238 | ||
239 | spin_unlock(&call->lock); | |
240 | atomic_inc(&call->ackr_not_idle); | |
241 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, sp->hdr.serial, false); | |
242 | _leave(" = 0 [posted]"); | |
243 | return 0; | |
244 | ||
245 | protocol_error: | |
246 | ret = -EBADMSG; | |
247 | out: | |
248 | spin_unlock(&call->lock); | |
249 | _leave(" = %d", ret); | |
250 | return ret; | |
251 | ||
252 | discard_and_ack: | |
253 | _debug("discard and ACK packet %p", skb); | |
254 | __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); | |
255 | discard: | |
256 | spin_unlock(&call->lock); | |
257 | rxrpc_free_skb(skb); | |
258 | _leave(" = 0 [discarded]"); | |
259 | return 0; | |
260 | ||
261 | enqueue_and_ack: | |
262 | __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); | |
263 | enqueue_packet: | |
264 | _net("defer skb %p", skb); | |
265 | spin_unlock(&call->lock); | |
266 | skb_queue_tail(&call->rx_queue, skb); | |
267 | atomic_inc(&call->ackr_not_idle); | |
268 | read_lock(&call->state_lock); | |
269 | if (call->state < RXRPC_CALL_DEAD) | |
270 | schedule_work(&call->processor); | |
271 | read_unlock(&call->state_lock); | |
272 | _leave(" = 0 [queued]"); | |
273 | return 0; | |
274 | } | |
275 | ||
276 | /* | |
277 | * assume an implicit ACKALL of the transmission phase of a client socket upon | |
278 | * reception of the first reply packet | |
279 | */ | |
280 | static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial) | |
281 | { | |
282 | write_lock_bh(&call->state_lock); | |
283 | ||
284 | switch (call->state) { | |
285 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
286 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
287 | call->acks_latest = serial; | |
288 | ||
289 | _debug("implicit ACKALL %%%u", call->acks_latest); | |
290 | set_bit(RXRPC_CALL_RCVD_ACKALL, &call->events); | |
291 | write_unlock_bh(&call->state_lock); | |
292 | ||
293 | if (try_to_del_timer_sync(&call->resend_timer) >= 0) { | |
294 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); | |
295 | clear_bit(RXRPC_CALL_RESEND, &call->events); | |
296 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
297 | } | |
298 | break; | |
299 | ||
300 | default: | |
301 | write_unlock_bh(&call->state_lock); | |
302 | break; | |
303 | } | |
304 | } | |
305 | ||
306 | /* | |
307 | * post an incoming packet to the nominated call to deal with | |
308 | * - must get rid of the sk_buff, either by freeing it or by queuing it | |
309 | */ | |
310 | void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb) | |
311 | { | |
312 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
313 | __be32 _abort_code; | |
314 | u32 serial, hi_serial, seq, abort_code; | |
315 | ||
316 | _enter("%p,%p", call, skb); | |
317 | ||
318 | ASSERT(!irqs_disabled()); | |
319 | ||
320 | #if 0 // INJECT RX ERROR | |
321 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { | |
322 | static int skip = 0; | |
323 | if (++skip == 3) { | |
324 | printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n"); | |
325 | skip = 0; | |
326 | goto free_packet; | |
327 | } | |
328 | } | |
329 | #endif | |
330 | ||
331 | /* track the latest serial number on this connection for ACK packet | |
332 | * information */ | |
333 | serial = ntohl(sp->hdr.serial); | |
334 | hi_serial = atomic_read(&call->conn->hi_serial); | |
335 | while (serial > hi_serial) | |
336 | hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial, | |
337 | serial); | |
338 | ||
339 | /* request ACK generation for any ACK or DATA packet that requests | |
340 | * it */ | |
341 | if (sp->hdr.flags & RXRPC_REQUEST_ACK) { | |
342 | _proto("ACK Requested on %%%u", serial); | |
343 | rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial, | |
344 | !(sp->hdr.flags & RXRPC_MORE_PACKETS)); | |
345 | } | |
346 | ||
347 | switch (sp->hdr.type) { | |
348 | case RXRPC_PACKET_TYPE_ABORT: | |
349 | _debug("abort"); | |
350 | ||
351 | if (skb_copy_bits(skb, 0, &_abort_code, | |
352 | sizeof(_abort_code)) < 0) | |
353 | goto protocol_error; | |
354 | ||
355 | abort_code = ntohl(_abort_code); | |
356 | _proto("Rx ABORT %%%u { %x }", serial, abort_code); | |
357 | ||
358 | write_lock_bh(&call->state_lock); | |
359 | if (call->state < RXRPC_CALL_COMPLETE) { | |
360 | call->state = RXRPC_CALL_REMOTELY_ABORTED; | |
361 | call->abort_code = abort_code; | |
362 | set_bit(RXRPC_CALL_RCVD_ABORT, &call->events); | |
363 | schedule_work(&call->processor); | |
364 | } | |
365 | goto free_packet_unlock; | |
366 | ||
367 | case RXRPC_PACKET_TYPE_BUSY: | |
368 | _proto("Rx BUSY %%%u", serial); | |
369 | ||
370 | if (call->conn->out_clientflag) | |
371 | goto protocol_error; | |
372 | ||
373 | write_lock_bh(&call->state_lock); | |
374 | switch (call->state) { | |
375 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
376 | call->state = RXRPC_CALL_SERVER_BUSY; | |
377 | set_bit(RXRPC_CALL_RCVD_BUSY, &call->events); | |
378 | schedule_work(&call->processor); | |
379 | case RXRPC_CALL_SERVER_BUSY: | |
380 | goto free_packet_unlock; | |
381 | default: | |
382 | goto protocol_error_locked; | |
383 | } | |
384 | ||
385 | default: | |
386 | _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], serial); | |
387 | goto protocol_error; | |
388 | ||
389 | case RXRPC_PACKET_TYPE_DATA: | |
390 | seq = ntohl(sp->hdr.seq); | |
391 | ||
392 | _proto("Rx DATA %%%u { #%u }", serial, seq); | |
393 | ||
394 | if (seq == 0) | |
395 | goto protocol_error; | |
396 | ||
397 | call->ackr_prev_seq = sp->hdr.seq; | |
398 | ||
399 | /* received data implicitly ACKs all of the request packets we | |
400 | * sent when we're acting as a client */ | |
401 | if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) | |
402 | rxrpc_assume_implicit_ackall(call, serial); | |
403 | ||
404 | switch (rxrpc_fast_process_data(call, skb, seq)) { | |
405 | case 0: | |
406 | skb = NULL; | |
407 | goto done; | |
408 | ||
409 | default: | |
410 | BUG(); | |
411 | ||
412 | /* data packet received beyond the last packet */ | |
413 | case -EBADMSG: | |
414 | goto protocol_error; | |
415 | } | |
416 | ||
417 | case RXRPC_PACKET_TYPE_ACK: | |
418 | /* ACK processing is done in process context */ | |
419 | read_lock_bh(&call->state_lock); | |
420 | if (call->state < RXRPC_CALL_DEAD) { | |
421 | skb_queue_tail(&call->rx_queue, skb); | |
422 | schedule_work(&call->processor); | |
423 | skb = NULL; | |
424 | } | |
425 | read_unlock_bh(&call->state_lock); | |
426 | goto free_packet; | |
427 | } | |
428 | ||
429 | protocol_error: | |
430 | _debug("protocol error"); | |
431 | write_lock_bh(&call->state_lock); | |
432 | protocol_error_locked: | |
433 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
434 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
435 | call->abort_code = RX_PROTOCOL_ERROR; | |
436 | set_bit(RXRPC_CALL_ABORT, &call->events); | |
437 | schedule_work(&call->processor); | |
438 | } | |
439 | free_packet_unlock: | |
440 | write_unlock_bh(&call->state_lock); | |
441 | free_packet: | |
442 | rxrpc_free_skb(skb); | |
443 | done: | |
444 | _leave(""); | |
445 | } | |
446 | ||
447 | /* | |
448 | * split up a jumbo data packet | |
449 | */ | |
450 | static void rxrpc_process_jumbo_packet(struct rxrpc_call *call, | |
451 | struct sk_buff *jumbo) | |
452 | { | |
453 | struct rxrpc_jumbo_header jhdr; | |
454 | struct rxrpc_skb_priv *sp; | |
455 | struct sk_buff *part; | |
456 | ||
457 | _enter(",{%u,%u}", jumbo->data_len, jumbo->len); | |
458 | ||
459 | sp = rxrpc_skb(jumbo); | |
460 | ||
461 | do { | |
462 | sp->hdr.flags &= ~RXRPC_JUMBO_PACKET; | |
463 | ||
464 | /* make a clone to represent the first subpacket in what's left | |
465 | * of the jumbo packet */ | |
466 | part = skb_clone(jumbo, GFP_ATOMIC); | |
467 | if (!part) { | |
468 | /* simply ditch the tail in the event of ENOMEM */ | |
469 | pskb_trim(jumbo, RXRPC_JUMBO_DATALEN); | |
470 | break; | |
471 | } | |
472 | rxrpc_new_skb(part); | |
473 | ||
474 | pskb_trim(part, RXRPC_JUMBO_DATALEN); | |
475 | ||
476 | if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN)) | |
477 | goto protocol_error; | |
478 | ||
479 | if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0) | |
480 | goto protocol_error; | |
481 | if (!pskb_pull(jumbo, sizeof(jhdr))) | |
482 | BUG(); | |
483 | ||
484 | sp->hdr.seq = htonl(ntohl(sp->hdr.seq) + 1); | |
485 | sp->hdr.serial = htonl(ntohl(sp->hdr.serial) + 1); | |
486 | sp->hdr.flags = jhdr.flags; | |
487 | sp->hdr._rsvd = jhdr._rsvd; | |
488 | ||
489 | _proto("Rx DATA Jumbo %%%u", ntohl(sp->hdr.serial) - 1); | |
490 | ||
491 | rxrpc_fast_process_packet(call, part); | |
492 | part = NULL; | |
493 | ||
494 | } while (sp->hdr.flags & RXRPC_JUMBO_PACKET); | |
495 | ||
496 | rxrpc_fast_process_packet(call, jumbo); | |
497 | _leave(""); | |
498 | return; | |
499 | ||
500 | protocol_error: | |
501 | _debug("protocol error"); | |
502 | rxrpc_free_skb(part); | |
503 | rxrpc_free_skb(jumbo); | |
504 | write_lock_bh(&call->state_lock); | |
505 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
506 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
507 | call->abort_code = RX_PROTOCOL_ERROR; | |
508 | set_bit(RXRPC_CALL_ABORT, &call->events); | |
509 | schedule_work(&call->processor); | |
510 | } | |
511 | write_unlock_bh(&call->state_lock); | |
512 | _leave(""); | |
513 | } | |
514 | ||
515 | /* | |
516 | * post an incoming packet to the appropriate call/socket to deal with | |
517 | * - must get rid of the sk_buff, either by freeing it or by queuing it | |
518 | */ | |
519 | static void rxrpc_post_packet_to_call(struct rxrpc_connection *conn, | |
520 | struct sk_buff *skb) | |
521 | { | |
522 | struct rxrpc_skb_priv *sp; | |
523 | struct rxrpc_call *call; | |
524 | struct rb_node *p; | |
525 | __be32 call_id; | |
526 | ||
527 | _enter("%p,%p", conn, skb); | |
528 | ||
529 | read_lock_bh(&conn->lock); | |
530 | ||
531 | sp = rxrpc_skb(skb); | |
532 | ||
533 | /* look at extant calls by channel number first */ | |
534 | call = conn->channels[ntohl(sp->hdr.cid) & RXRPC_CHANNELMASK]; | |
535 | if (!call || call->call_id != sp->hdr.callNumber) | |
536 | goto call_not_extant; | |
537 | ||
538 | _debug("extant call [%d]", call->state); | |
539 | ASSERTCMP(call->conn, ==, conn); | |
540 | ||
541 | read_lock(&call->state_lock); | |
542 | switch (call->state) { | |
543 | case RXRPC_CALL_LOCALLY_ABORTED: | |
544 | if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events)) | |
545 | schedule_work(&call->processor); | |
546 | case RXRPC_CALL_REMOTELY_ABORTED: | |
547 | case RXRPC_CALL_NETWORK_ERROR: | |
548 | case RXRPC_CALL_DEAD: | |
549 | goto free_unlock; | |
550 | default: | |
551 | break; | |
552 | } | |
553 | ||
554 | read_unlock(&call->state_lock); | |
555 | rxrpc_get_call(call); | |
556 | read_unlock_bh(&conn->lock); | |
557 | ||
558 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
559 | sp->hdr.flags & RXRPC_JUMBO_PACKET) | |
560 | rxrpc_process_jumbo_packet(call, skb); | |
561 | else | |
562 | rxrpc_fast_process_packet(call, skb); | |
563 | ||
564 | rxrpc_put_call(call); | |
565 | goto done; | |
566 | ||
567 | call_not_extant: | |
568 | /* search the completed calls in case what we're dealing with is | |
569 | * there */ | |
570 | _debug("call not extant"); | |
571 | ||
572 | call_id = sp->hdr.callNumber; | |
573 | p = conn->calls.rb_node; | |
574 | while (p) { | |
575 | call = rb_entry(p, struct rxrpc_call, conn_node); | |
576 | ||
577 | if (call_id < call->call_id) | |
578 | p = p->rb_left; | |
579 | else if (call_id > call->call_id) | |
580 | p = p->rb_right; | |
581 | else | |
582 | goto found_completed_call; | |
583 | } | |
584 | ||
585 | dead_call: | |
586 | /* it's a either a really old call that we no longer remember or its a | |
587 | * new incoming call */ | |
588 | read_unlock_bh(&conn->lock); | |
589 | ||
590 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED && | |
591 | sp->hdr.seq == __constant_cpu_to_be32(1)) { | |
592 | _debug("incoming call"); | |
593 | skb_queue_tail(&conn->trans->local->accept_queue, skb); | |
594 | schedule_work(&conn->trans->local->acceptor); | |
595 | goto done; | |
596 | } | |
597 | ||
598 | _debug("dead call"); | |
599 | skb->priority = RX_CALL_DEAD; | |
600 | rxrpc_reject_packet(conn->trans->local, skb); | |
601 | goto done; | |
602 | ||
603 | /* resend last packet of a completed call | |
604 | * - client calls may have been aborted or ACK'd | |
605 | * - server calls may have been aborted | |
606 | */ | |
607 | found_completed_call: | |
608 | _debug("completed call"); | |
609 | ||
610 | if (atomic_read(&call->usage) == 0) | |
611 | goto dead_call; | |
612 | ||
613 | /* synchronise any state changes */ | |
614 | read_lock(&call->state_lock); | |
615 | ASSERTIFCMP(call->state != RXRPC_CALL_CLIENT_FINAL_ACK, | |
616 | call->state, >=, RXRPC_CALL_COMPLETE); | |
617 | ||
618 | if (call->state == RXRPC_CALL_LOCALLY_ABORTED || | |
619 | call->state == RXRPC_CALL_REMOTELY_ABORTED || | |
620 | call->state == RXRPC_CALL_DEAD) { | |
621 | read_unlock(&call->state_lock); | |
622 | goto dead_call; | |
623 | } | |
624 | ||
625 | if (call->conn->in_clientflag) { | |
626 | read_unlock(&call->state_lock); | |
627 | goto dead_call; /* complete server call */ | |
628 | } | |
629 | ||
630 | _debug("final ack again"); | |
631 | rxrpc_get_call(call); | |
632 | set_bit(RXRPC_CALL_ACK_FINAL, &call->events); | |
633 | schedule_work(&call->processor); | |
634 | ||
635 | free_unlock: | |
636 | read_unlock(&call->state_lock); | |
637 | read_unlock_bh(&conn->lock); | |
638 | rxrpc_free_skb(skb); | |
639 | done: | |
640 | _leave(""); | |
641 | } | |
642 | ||
643 | /* | |
644 | * post connection-level events to the connection | |
645 | * - this includes challenges, responses and some aborts | |
646 | */ | |
647 | static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, | |
648 | struct sk_buff *skb) | |
649 | { | |
650 | _enter("%p,%p", conn, skb); | |
651 | ||
652 | atomic_inc(&conn->usage); | |
653 | skb_queue_tail(&conn->rx_queue, skb); | |
654 | schedule_work(&conn->processor); | |
655 | } | |
656 | ||
657 | /* | |
658 | * handle data received on the local endpoint | |
659 | * - may be called in interrupt context | |
660 | */ | |
661 | void rxrpc_data_ready(struct sock *sk, int count) | |
662 | { | |
663 | struct rxrpc_connection *conn; | |
664 | struct rxrpc_transport *trans; | |
665 | struct rxrpc_skb_priv *sp; | |
666 | struct rxrpc_local *local; | |
667 | struct rxrpc_peer *peer; | |
668 | struct sk_buff *skb; | |
669 | int ret; | |
670 | ||
671 | _enter("%p, %d", sk, count); | |
672 | ||
673 | ASSERT(!irqs_disabled()); | |
674 | ||
675 | read_lock_bh(&rxrpc_local_lock); | |
676 | local = sk->sk_user_data; | |
677 | if (local && atomic_read(&local->usage) > 0) | |
678 | rxrpc_get_local(local); | |
679 | else | |
680 | local = NULL; | |
681 | read_unlock_bh(&rxrpc_local_lock); | |
682 | if (!local) { | |
683 | _leave(" [local dead]"); | |
684 | return; | |
685 | } | |
686 | ||
687 | skb = skb_recv_datagram(sk, 0, 1, &ret); | |
688 | if (!skb) { | |
689 | rxrpc_put_local(local); | |
690 | if (ret == -EAGAIN) | |
691 | return; | |
692 | _debug("UDP socket error %d", ret); | |
693 | return; | |
694 | } | |
695 | ||
696 | rxrpc_new_skb(skb); | |
697 | ||
698 | _net("recv skb %p", skb); | |
699 | ||
700 | /* we'll probably need to checksum it (didn't call sock_recvmsg) */ | |
701 | if (skb_checksum_complete(skb)) { | |
702 | rxrpc_free_skb(skb); | |
703 | rxrpc_put_local(local); | |
704 | _leave(" [CSUM failed]"); | |
705 | return; | |
706 | } | |
707 | ||
708 | /* the socket buffer we have is owned by UDP, with UDP's data all over | |
709 | * it, but we really want our own */ | |
710 | skb_orphan(skb); | |
711 | sp = rxrpc_skb(skb); | |
712 | memset(sp, 0, sizeof(*sp)); | |
713 | ||
714 | _net("Rx UDP packet from %08x:%04hu", | |
715 | ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source)); | |
716 | ||
717 | /* dig out the RxRPC connection details */ | |
718 | if (skb_copy_bits(skb, sizeof(struct udphdr), &sp->hdr, | |
719 | sizeof(sp->hdr)) < 0) | |
720 | goto bad_message; | |
721 | if (!pskb_pull(skb, sizeof(struct udphdr) + sizeof(sp->hdr))) | |
722 | BUG(); | |
723 | ||
724 | _net("Rx RxRPC %s ep=%x call=%x:%x", | |
725 | sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient", | |
726 | ntohl(sp->hdr.epoch), | |
727 | ntohl(sp->hdr.cid), | |
728 | ntohl(sp->hdr.callNumber)); | |
729 | ||
730 | if (sp->hdr.type == 0 || sp->hdr.type >= RXRPC_N_PACKET_TYPES) { | |
731 | _proto("Rx Bad Packet Type %u", sp->hdr.type); | |
732 | goto bad_message; | |
733 | } | |
734 | ||
735 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
736 | (sp->hdr.callNumber == 0 || sp->hdr.seq == 0)) | |
737 | goto bad_message; | |
738 | ||
739 | peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr, udp_hdr(skb)->source); | |
740 | if (IS_ERR(peer)) | |
741 | goto cant_route_call; | |
742 | ||
743 | trans = rxrpc_find_transport(local, peer); | |
744 | rxrpc_put_peer(peer); | |
745 | if (!trans) | |
746 | goto cant_route_call; | |
747 | ||
748 | conn = rxrpc_find_connection(trans, &sp->hdr); | |
749 | rxrpc_put_transport(trans); | |
750 | if (!conn) | |
751 | goto cant_route_call; | |
752 | ||
753 | _debug("CONN %p {%d}", conn, conn->debug_id); | |
754 | ||
755 | if (sp->hdr.callNumber == 0) | |
756 | rxrpc_post_packet_to_conn(conn, skb); | |
757 | else | |
758 | rxrpc_post_packet_to_call(conn, skb); | |
759 | rxrpc_put_connection(conn); | |
760 | rxrpc_put_local(local); | |
761 | return; | |
762 | ||
763 | cant_route_call: | |
764 | _debug("can't route call"); | |
765 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED && | |
766 | sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { | |
767 | if (sp->hdr.seq == __constant_cpu_to_be32(1)) { | |
768 | _debug("first packet"); | |
769 | skb_queue_tail(&local->accept_queue, skb); | |
770 | schedule_work(&local->acceptor); | |
771 | rxrpc_put_local(local); | |
772 | _leave(" [incoming]"); | |
773 | return; | |
774 | } | |
775 | skb->priority = RX_INVALID_OPERATION; | |
776 | } else { | |
777 | skb->priority = RX_CALL_DEAD; | |
778 | } | |
779 | ||
780 | _debug("reject"); | |
781 | rxrpc_reject_packet(local, skb); | |
782 | rxrpc_put_local(local); | |
783 | _leave(" [no call]"); | |
784 | return; | |
785 | ||
786 | bad_message: | |
787 | skb->priority = RX_PROTOCOL_ERROR; | |
788 | rxrpc_reject_packet(local, skb); | |
789 | rxrpc_put_local(local); | |
790 | _leave(" [badmsg]"); | |
791 | } |