Commit | Line | Data |
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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> | |
1781f7f5 | 23 | #include <net/udp.h> |
17926a79 DH |
24 | #include "ar-internal.h" |
25 | ||
26 | unsigned long rxrpc_ack_timeout = 1; | |
27 | ||
28 | const 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 | */ | |
42 | int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb, | |
43 | bool force, bool terminal) | |
44 | { | |
45 | struct rxrpc_skb_priv *sp; | |
651350d1 | 46 | struct rxrpc_sock *rx = call->socket; |
17926a79 DH |
47 | 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 | ||
651350d1 | 69 | sk = &rx->sk; |
17926a79 DH |
70 | |
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 | ||
17926a79 DH |
94 | if (terminal) { |
95 | _debug("<<<< TERMINAL MESSAGE >>>>"); | |
96 | set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags); | |
97 | } | |
98 | ||
651350d1 DH |
99 | /* 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 | } | |
17926a79 DH |
118 | skb = NULL; |
119 | } else { | |
120 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
121 | } | |
122 | ret = 0; | |
123 | ||
124 | out: | |
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 | */ | |
141 | static 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); | |
68c708fd | 172 | if (__test_and_set_bit(ackbit, call->ackr_window)) { |
17926a79 DH |
173 | _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); | |
68c708fd | 181 | __clear_bit(ackbit, call->ackr_window); |
17926a79 DH |
182 | 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) { | |
68c708fd | 219 | __clear_bit(ackbit, call->ackr_window); |
17926a79 DH |
220 | 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)) | |
651350d1 | 242 | rxrpc_queue_call(call); |
17926a79 DH |
243 | 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 | ||
252 | protocol_error: | |
253 | ret = -EBADMSG; | |
254 | out: | |
255 | spin_unlock(&call->lock); | |
256 | _leave(" = %d", ret); | |
257 | return ret; | |
258 | ||
259 | discard_and_ack: | |
260 | _debug("discard and ACK packet %p", skb); | |
261 | __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); | |
262 | discard: | |
263 | spin_unlock(&call->lock); | |
264 | rxrpc_free_skb(skb); | |
265 | _leave(" = 0 [discarded]"); | |
266 | return 0; | |
267 | ||
268 | enqueue_and_ack: | |
269 | __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); | |
270 | enqueue_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) | |
651350d1 | 277 | rxrpc_queue_call(call); |
17926a79 DH |
278 | 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 | */ | |
287 | static 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 | */ | |
317 | void 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); | |
651350d1 | 370 | rxrpc_queue_call(call); |
17926a79 DH |
371 | } |
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); | |
651350d1 | 385 | rxrpc_queue_call(call); |
17926a79 DH |
386 | 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); | |
651350d1 | 429 | rxrpc_queue_call(call); |
17926a79 DH |
430 | skb = NULL; |
431 | } | |
432 | read_unlock_bh(&call->state_lock); | |
433 | goto free_packet; | |
434 | } | |
435 | ||
436 | protocol_error: | |
437 | _debug("protocol error"); | |
438 | write_lock_bh(&call->state_lock); | |
439 | protocol_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); | |
651350d1 | 444 | rxrpc_queue_call(call); |
17926a79 DH |
445 | } |
446 | free_packet_unlock: | |
447 | write_unlock_bh(&call->state_lock); | |
448 | free_packet: | |
449 | rxrpc_free_skb(skb); | |
450 | done: | |
451 | _leave(""); | |
452 | } | |
453 | ||
454 | /* | |
455 | * split up a jumbo data packet | |
456 | */ | |
457 | static 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 | ||
507 | protocol_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); | |
651350d1 | 516 | rxrpc_queue_call(call); |
17926a79 DH |
517 | } |
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 | */ | |
526 | static 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)) | |
651350d1 | 552 | rxrpc_queue_call(call); |
17926a79 DH |
553 | 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 | ||
574 | call_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 | ||
592 | dead_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 && | |
ae445d17 | 598 | sp->hdr.seq == cpu_to_be32(1)) { |
17926a79 DH |
599 | _debug("incoming call"); |
600 | skb_queue_tail(&conn->trans->local->accept_queue, skb); | |
651350d1 | 601 | rxrpc_queue_work(&conn->trans->local->acceptor); |
17926a79 DH |
602 | 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 | */ | |
614 | found_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); | |
651350d1 | 640 | rxrpc_queue_call(call); |
17926a79 DH |
641 | |
642 | free_unlock: | |
643 | read_unlock(&call->state_lock); | |
644 | read_unlock_bh(&conn->lock); | |
645 | rxrpc_free_skb(skb); | |
646 | done: | |
647 | _leave(""); | |
648 | } | |
649 | ||
650 | /* | |
651 | * post connection-level events to the connection | |
652 | * - this includes challenges, responses and some aborts | |
653 | */ | |
654 | static 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); | |
651350d1 | 661 | rxrpc_queue_conn(conn); |
17926a79 DH |
662 | } |
663 | ||
664 | /* | |
665 | * handle data received on the local endpoint | |
666 | * - may be called in interrupt context | |
667 | */ | |
668 | void 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); | |
1781f7f5 | 711 | UDP_INC_STATS_BH(UDP_MIB_INERRORS, 0); |
17926a79 DH |
712 | _leave(" [CSUM failed]"); |
713 | return; | |
714 | } | |
715 | ||
1781f7f5 HX |
716 | UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, 0); |
717 | ||
17926a79 DH |
718 | /* 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 | ||
773 | cant_route_call: | |
774 | _debug("can't route call"); | |
775 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED && | |
776 | sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { | |
ae445d17 | 777 | if (sp->hdr.seq == cpu_to_be32(1)) { |
17926a79 DH |
778 | _debug("first packet"); |
779 | skb_queue_tail(&local->accept_queue, skb); | |
651350d1 | 780 | rxrpc_queue_work(&local->acceptor); |
17926a79 DH |
781 | 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 | ||
796 | bad_message: | |
797 | skb->priority = RX_PROTOCOL_ERROR; | |
798 | rxrpc_reject_packet(local, skb); | |
799 | rxrpc_put_local(local); | |
800 | _leave(" [badmsg]"); | |
801 | } |