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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> | |
5a0e3ad6 | 20 | #include <linux/gfp.h> |
17926a79 DH |
21 | #include <net/sock.h> |
22 | #include <net/af_rxrpc.h> | |
23 | #include <net/ip.h> | |
1781f7f5 | 24 | #include <net/udp.h> |
0283328e | 25 | #include <net/net_namespace.h> |
17926a79 DH |
26 | #include "ar-internal.h" |
27 | ||
17926a79 DH |
28 | /* |
29 | * queue a packet for recvmsg to pass to userspace | |
30 | * - the caller must hold a lock on call->lock | |
31 | * - must not be called with interrupts disabled (sk_filter() disables BH's) | |
32 | * - eats the packet whether successful or not | |
33 | * - there must be just one reference to the packet, which the caller passes to | |
34 | * this function | |
35 | */ | |
36 | int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb, | |
37 | bool force, bool terminal) | |
38 | { | |
39 | struct rxrpc_skb_priv *sp; | |
651350d1 | 40 | struct rxrpc_sock *rx = call->socket; |
17926a79 | 41 | struct sock *sk; |
884cf705 | 42 | int ret; |
17926a79 DH |
43 | |
44 | _enter(",,%d,%d", force, terminal); | |
45 | ||
46 | ASSERT(!irqs_disabled()); | |
47 | ||
48 | sp = rxrpc_skb(skb); | |
49 | ASSERTCMP(sp->call, ==, call); | |
50 | ||
51 | /* if we've already posted the terminal message for a call, then we | |
52 | * don't post any more */ | |
53 | if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { | |
54 | _debug("already terminated"); | |
55 | ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE); | |
56 | skb->destructor = NULL; | |
57 | sp->call = NULL; | |
58 | rxrpc_put_call(call); | |
59 | rxrpc_free_skb(skb); | |
60 | return 0; | |
61 | } | |
62 | ||
651350d1 | 63 | sk = &rx->sk; |
17926a79 DH |
64 | |
65 | if (!force) { | |
66 | /* cast skb->rcvbuf to unsigned... It's pointless, but | |
67 | * reduces number of warnings when compiling with -W | |
68 | * --ANK */ | |
69 | // ret = -ENOBUFS; | |
70 | // if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
95c96174 | 71 | // (unsigned int) sk->sk_rcvbuf) |
17926a79 DH |
72 | // goto out; |
73 | ||
74 | ret = sk_filter(sk, skb); | |
75 | if (ret < 0) | |
76 | goto out; | |
77 | } | |
78 | ||
79 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
80 | if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) && | |
81 | !test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
82 | call->socket->sk.sk_state != RXRPC_CLOSE) { | |
83 | skb->destructor = rxrpc_packet_destructor; | |
84 | skb->dev = NULL; | |
85 | skb->sk = sk; | |
86 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
87 | ||
17926a79 DH |
88 | if (terminal) { |
89 | _debug("<<<< TERMINAL MESSAGE >>>>"); | |
90 | set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags); | |
91 | } | |
92 | ||
651350d1 DH |
93 | /* allow interception by a kernel service */ |
94 | if (rx->interceptor) { | |
95 | rx->interceptor(sk, call->user_call_ID, skb); | |
96 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
97 | } else { | |
651350d1 DH |
98 | _net("post skb %p", skb); |
99 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
100 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
101 | ||
102 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 103 | sk->sk_data_ready(sk); |
651350d1 | 104 | } |
17926a79 DH |
105 | skb = NULL; |
106 | } else { | |
107 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
108 | } | |
109 | ret = 0; | |
110 | ||
111 | out: | |
112 | /* release the socket buffer */ | |
113 | if (skb) { | |
114 | skb->destructor = NULL; | |
115 | sp->call = NULL; | |
116 | rxrpc_put_call(call); | |
117 | rxrpc_free_skb(skb); | |
118 | } | |
119 | ||
120 | _leave(" = %d", ret); | |
121 | return ret; | |
122 | } | |
123 | ||
124 | /* | |
125 | * process a DATA packet, posting the packet to the appropriate queue | |
126 | * - eats the packet if successful | |
127 | */ | |
128 | static int rxrpc_fast_process_data(struct rxrpc_call *call, | |
129 | struct sk_buff *skb, u32 seq) | |
130 | { | |
131 | struct rxrpc_skb_priv *sp; | |
132 | bool terminal; | |
133 | int ret, ackbit, ack; | |
134 | ||
135 | _enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq); | |
136 | ||
137 | sp = rxrpc_skb(skb); | |
138 | ASSERTCMP(sp->call, ==, NULL); | |
139 | ||
140 | spin_lock(&call->lock); | |
141 | ||
142 | if (call->state > RXRPC_CALL_COMPLETE) | |
143 | goto discard; | |
144 | ||
145 | ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post); | |
146 | ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv); | |
147 | ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten); | |
148 | ||
149 | if (seq < call->rx_data_post) { | |
150 | _debug("dup #%u [-%u]", seq, call->rx_data_post); | |
151 | ack = RXRPC_ACK_DUPLICATE; | |
152 | ret = -ENOBUFS; | |
153 | goto discard_and_ack; | |
154 | } | |
155 | ||
156 | /* we may already have the packet in the out of sequence queue */ | |
157 | ackbit = seq - (call->rx_data_eaten + 1); | |
158 | ASSERTCMP(ackbit, >=, 0); | |
68c708fd | 159 | if (__test_and_set_bit(ackbit, call->ackr_window)) { |
17926a79 DH |
160 | _debug("dup oos #%u [%u,%u]", |
161 | seq, call->rx_data_eaten, call->rx_data_post); | |
162 | ack = RXRPC_ACK_DUPLICATE; | |
163 | goto discard_and_ack; | |
164 | } | |
165 | ||
166 | if (seq >= call->ackr_win_top) { | |
167 | _debug("exceed #%u [%u]", seq, call->ackr_win_top); | |
68c708fd | 168 | __clear_bit(ackbit, call->ackr_window); |
17926a79 DH |
169 | ack = RXRPC_ACK_EXCEEDS_WINDOW; |
170 | goto discard_and_ack; | |
171 | } | |
172 | ||
173 | if (seq == call->rx_data_expect) { | |
174 | clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags); | |
175 | call->rx_data_expect++; | |
176 | } else if (seq > call->rx_data_expect) { | |
177 | _debug("oos #%u [%u]", seq, call->rx_data_expect); | |
178 | call->rx_data_expect = seq + 1; | |
179 | if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) { | |
180 | ack = RXRPC_ACK_OUT_OF_SEQUENCE; | |
181 | goto enqueue_and_ack; | |
182 | } | |
183 | goto enqueue_packet; | |
184 | } | |
185 | ||
186 | if (seq != call->rx_data_post) { | |
187 | _debug("ahead #%u [%u]", seq, call->rx_data_post); | |
188 | goto enqueue_packet; | |
189 | } | |
190 | ||
191 | if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags)) | |
192 | goto protocol_error; | |
193 | ||
194 | /* if the packet need security things doing to it, then it goes down | |
195 | * the slow path */ | |
e0e4d82f | 196 | if (call->conn->security_ix) |
17926a79 DH |
197 | goto enqueue_packet; |
198 | ||
199 | sp->call = call; | |
200 | rxrpc_get_call(call); | |
201 | terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && | |
202 | !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); | |
203 | ret = rxrpc_queue_rcv_skb(call, skb, false, terminal); | |
204 | if (ret < 0) { | |
205 | if (ret == -ENOMEM || ret == -ENOBUFS) { | |
68c708fd | 206 | __clear_bit(ackbit, call->ackr_window); |
17926a79 DH |
207 | ack = RXRPC_ACK_NOSPACE; |
208 | goto discard_and_ack; | |
209 | } | |
210 | goto out; | |
211 | } | |
212 | ||
213 | skb = NULL; | |
214 | ||
215 | _debug("post #%u", seq); | |
216 | ASSERTCMP(call->rx_data_post, ==, seq); | |
217 | call->rx_data_post++; | |
218 | ||
219 | if (sp->hdr.flags & RXRPC_LAST_PACKET) | |
220 | set_bit(RXRPC_CALL_RCVD_LAST, &call->flags); | |
221 | ||
222 | /* if we've reached an out of sequence packet then we need to drain | |
223 | * that queue into the socket Rx queue now */ | |
224 | if (call->rx_data_post == call->rx_first_oos) { | |
225 | _debug("drain rx oos now"); | |
226 | read_lock(&call->state_lock); | |
227 | if (call->state < RXRPC_CALL_COMPLETE && | |
4c198ad1 | 228 | !test_and_set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events)) |
651350d1 | 229 | rxrpc_queue_call(call); |
17926a79 DH |
230 | read_unlock(&call->state_lock); |
231 | } | |
232 | ||
233 | spin_unlock(&call->lock); | |
234 | atomic_inc(&call->ackr_not_idle); | |
235 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, sp->hdr.serial, false); | |
236 | _leave(" = 0 [posted]"); | |
237 | return 0; | |
238 | ||
239 | protocol_error: | |
240 | ret = -EBADMSG; | |
241 | out: | |
242 | spin_unlock(&call->lock); | |
243 | _leave(" = %d", ret); | |
244 | return ret; | |
245 | ||
246 | discard_and_ack: | |
247 | _debug("discard and ACK packet %p", skb); | |
248 | __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); | |
249 | discard: | |
250 | spin_unlock(&call->lock); | |
251 | rxrpc_free_skb(skb); | |
252 | _leave(" = 0 [discarded]"); | |
253 | return 0; | |
254 | ||
255 | enqueue_and_ack: | |
256 | __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); | |
257 | enqueue_packet: | |
258 | _net("defer skb %p", skb); | |
259 | spin_unlock(&call->lock); | |
260 | skb_queue_tail(&call->rx_queue, skb); | |
261 | atomic_inc(&call->ackr_not_idle); | |
262 | read_lock(&call->state_lock); | |
263 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 264 | rxrpc_queue_call(call); |
17926a79 DH |
265 | read_unlock(&call->state_lock); |
266 | _leave(" = 0 [queued]"); | |
267 | return 0; | |
268 | } | |
269 | ||
270 | /* | |
271 | * assume an implicit ACKALL of the transmission phase of a client socket upon | |
272 | * reception of the first reply packet | |
273 | */ | |
274 | static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial) | |
275 | { | |
276 | write_lock_bh(&call->state_lock); | |
277 | ||
278 | switch (call->state) { | |
279 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
280 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
281 | call->acks_latest = serial; | |
282 | ||
283 | _debug("implicit ACKALL %%%u", call->acks_latest); | |
4c198ad1 | 284 | set_bit(RXRPC_CALL_EV_RCVD_ACKALL, &call->events); |
17926a79 DH |
285 | write_unlock_bh(&call->state_lock); |
286 | ||
287 | if (try_to_del_timer_sync(&call->resend_timer) >= 0) { | |
4c198ad1 DH |
288 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
289 | clear_bit(RXRPC_CALL_EV_RESEND, &call->events); | |
17926a79 DH |
290 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
291 | } | |
292 | break; | |
293 | ||
294 | default: | |
295 | write_unlock_bh(&call->state_lock); | |
296 | break; | |
297 | } | |
298 | } | |
299 | ||
300 | /* | |
301 | * post an incoming packet to the nominated call to deal with | |
302 | * - must get rid of the sk_buff, either by freeing it or by queuing it | |
303 | */ | |
304 | void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb) | |
305 | { | |
306 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
0d12f8a4 DH |
307 | __be32 wtmp; |
308 | u32 hi_serial, abort_code; | |
17926a79 DH |
309 | |
310 | _enter("%p,%p", call, skb); | |
311 | ||
312 | ASSERT(!irqs_disabled()); | |
313 | ||
314 | #if 0 // INJECT RX ERROR | |
315 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { | |
316 | static int skip = 0; | |
317 | if (++skip == 3) { | |
318 | printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n"); | |
319 | skip = 0; | |
320 | goto free_packet; | |
321 | } | |
322 | } | |
323 | #endif | |
324 | ||
325 | /* track the latest serial number on this connection for ACK packet | |
326 | * information */ | |
17926a79 | 327 | hi_serial = atomic_read(&call->conn->hi_serial); |
0d12f8a4 | 328 | while (sp->hdr.serial > hi_serial) |
17926a79 | 329 | hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial, |
0d12f8a4 | 330 | sp->hdr.serial); |
17926a79 DH |
331 | |
332 | /* request ACK generation for any ACK or DATA packet that requests | |
333 | * it */ | |
334 | if (sp->hdr.flags & RXRPC_REQUEST_ACK) { | |
0d12f8a4 | 335 | _proto("ACK Requested on %%%u", sp->hdr.serial); |
9823f39a | 336 | rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial, false); |
17926a79 DH |
337 | } |
338 | ||
339 | switch (sp->hdr.type) { | |
340 | case RXRPC_PACKET_TYPE_ABORT: | |
341 | _debug("abort"); | |
342 | ||
0d12f8a4 | 343 | if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0) |
17926a79 DH |
344 | goto protocol_error; |
345 | ||
0d12f8a4 DH |
346 | abort_code = ntohl(wtmp); |
347 | _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code); | |
17926a79 DH |
348 | |
349 | write_lock_bh(&call->state_lock); | |
350 | if (call->state < RXRPC_CALL_COMPLETE) { | |
351 | call->state = RXRPC_CALL_REMOTELY_ABORTED; | |
dc44b3a0 | 352 | call->remote_abort = abort_code; |
4c198ad1 | 353 | set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); |
651350d1 | 354 | rxrpc_queue_call(call); |
17926a79 DH |
355 | } |
356 | goto free_packet_unlock; | |
357 | ||
358 | case RXRPC_PACKET_TYPE_BUSY: | |
0d12f8a4 | 359 | _proto("Rx BUSY %%%u", sp->hdr.serial); |
17926a79 DH |
360 | |
361 | if (call->conn->out_clientflag) | |
362 | goto protocol_error; | |
363 | ||
364 | write_lock_bh(&call->state_lock); | |
365 | switch (call->state) { | |
366 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
367 | call->state = RXRPC_CALL_SERVER_BUSY; | |
4c198ad1 | 368 | set_bit(RXRPC_CALL_EV_RCVD_BUSY, &call->events); |
651350d1 | 369 | rxrpc_queue_call(call); |
17926a79 DH |
370 | case RXRPC_CALL_SERVER_BUSY: |
371 | goto free_packet_unlock; | |
372 | default: | |
373 | goto protocol_error_locked; | |
374 | } | |
375 | ||
376 | default: | |
0d12f8a4 | 377 | _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], sp->hdr.serial); |
17926a79 DH |
378 | goto protocol_error; |
379 | ||
380 | case RXRPC_PACKET_TYPE_DATA: | |
0d12f8a4 | 381 | _proto("Rx DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq); |
17926a79 | 382 | |
0d12f8a4 | 383 | if (sp->hdr.seq == 0) |
17926a79 DH |
384 | goto protocol_error; |
385 | ||
386 | call->ackr_prev_seq = sp->hdr.seq; | |
387 | ||
388 | /* received data implicitly ACKs all of the request packets we | |
389 | * sent when we're acting as a client */ | |
390 | if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) | |
0d12f8a4 | 391 | rxrpc_assume_implicit_ackall(call, sp->hdr.serial); |
17926a79 | 392 | |
0d12f8a4 | 393 | switch (rxrpc_fast_process_data(call, skb, sp->hdr.seq)) { |
17926a79 DH |
394 | case 0: |
395 | skb = NULL; | |
396 | goto done; | |
397 | ||
398 | default: | |
399 | BUG(); | |
400 | ||
401 | /* data packet received beyond the last packet */ | |
402 | case -EBADMSG: | |
403 | goto protocol_error; | |
404 | } | |
405 | ||
10003453 | 406 | case RXRPC_PACKET_TYPE_ACKALL: |
17926a79 DH |
407 | case RXRPC_PACKET_TYPE_ACK: |
408 | /* ACK processing is done in process context */ | |
409 | read_lock_bh(&call->state_lock); | |
410 | if (call->state < RXRPC_CALL_DEAD) { | |
411 | skb_queue_tail(&call->rx_queue, skb); | |
651350d1 | 412 | rxrpc_queue_call(call); |
17926a79 DH |
413 | skb = NULL; |
414 | } | |
415 | read_unlock_bh(&call->state_lock); | |
416 | goto free_packet; | |
417 | } | |
418 | ||
419 | protocol_error: | |
420 | _debug("protocol error"); | |
421 | write_lock_bh(&call->state_lock); | |
422 | protocol_error_locked: | |
423 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
424 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
dc44b3a0 | 425 | call->local_abort = RX_PROTOCOL_ERROR; |
4c198ad1 | 426 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
651350d1 | 427 | rxrpc_queue_call(call); |
17926a79 DH |
428 | } |
429 | free_packet_unlock: | |
430 | write_unlock_bh(&call->state_lock); | |
431 | free_packet: | |
432 | rxrpc_free_skb(skb); | |
433 | done: | |
434 | _leave(""); | |
435 | } | |
436 | ||
437 | /* | |
438 | * split up a jumbo data packet | |
439 | */ | |
440 | static void rxrpc_process_jumbo_packet(struct rxrpc_call *call, | |
441 | struct sk_buff *jumbo) | |
442 | { | |
443 | struct rxrpc_jumbo_header jhdr; | |
444 | struct rxrpc_skb_priv *sp; | |
445 | struct sk_buff *part; | |
446 | ||
447 | _enter(",{%u,%u}", jumbo->data_len, jumbo->len); | |
448 | ||
449 | sp = rxrpc_skb(jumbo); | |
450 | ||
451 | do { | |
452 | sp->hdr.flags &= ~RXRPC_JUMBO_PACKET; | |
453 | ||
454 | /* make a clone to represent the first subpacket in what's left | |
455 | * of the jumbo packet */ | |
456 | part = skb_clone(jumbo, GFP_ATOMIC); | |
457 | if (!part) { | |
458 | /* simply ditch the tail in the event of ENOMEM */ | |
459 | pskb_trim(jumbo, RXRPC_JUMBO_DATALEN); | |
460 | break; | |
461 | } | |
462 | rxrpc_new_skb(part); | |
463 | ||
464 | pskb_trim(part, RXRPC_JUMBO_DATALEN); | |
465 | ||
466 | if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN)) | |
467 | goto protocol_error; | |
468 | ||
469 | if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0) | |
470 | goto protocol_error; | |
471 | if (!pskb_pull(jumbo, sizeof(jhdr))) | |
472 | BUG(); | |
473 | ||
0d12f8a4 DH |
474 | sp->hdr.seq += 1; |
475 | sp->hdr.serial += 1; | |
17926a79 DH |
476 | sp->hdr.flags = jhdr.flags; |
477 | sp->hdr._rsvd = jhdr._rsvd; | |
478 | ||
0d12f8a4 | 479 | _proto("Rx DATA Jumbo %%%u", sp->hdr.serial - 1); |
17926a79 DH |
480 | |
481 | rxrpc_fast_process_packet(call, part); | |
482 | part = NULL; | |
483 | ||
484 | } while (sp->hdr.flags & RXRPC_JUMBO_PACKET); | |
485 | ||
486 | rxrpc_fast_process_packet(call, jumbo); | |
487 | _leave(""); | |
488 | return; | |
489 | ||
490 | protocol_error: | |
491 | _debug("protocol error"); | |
492 | rxrpc_free_skb(part); | |
493 | rxrpc_free_skb(jumbo); | |
494 | write_lock_bh(&call->state_lock); | |
495 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
496 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
dc44b3a0 | 497 | call->local_abort = RX_PROTOCOL_ERROR; |
4c198ad1 | 498 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
651350d1 | 499 | rxrpc_queue_call(call); |
17926a79 DH |
500 | } |
501 | write_unlock_bh(&call->state_lock); | |
502 | _leave(""); | |
503 | } | |
504 | ||
505 | /* | |
506 | * post an incoming packet to the appropriate call/socket to deal with | |
507 | * - must get rid of the sk_buff, either by freeing it or by queuing it | |
508 | */ | |
7727640c | 509 | static void rxrpc_post_packet_to_call(struct rxrpc_call *call, |
17926a79 DH |
510 | struct sk_buff *skb) |
511 | { | |
512 | struct rxrpc_skb_priv *sp; | |
17926a79 | 513 | |
7727640c | 514 | _enter("%p,%p", call, skb); |
17926a79 DH |
515 | |
516 | sp = rxrpc_skb(skb); | |
517 | ||
17926a79 | 518 | _debug("extant call [%d]", call->state); |
17926a79 DH |
519 | |
520 | read_lock(&call->state_lock); | |
521 | switch (call->state) { | |
522 | case RXRPC_CALL_LOCALLY_ABORTED: | |
4c198ad1 | 523 | if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events)) { |
651350d1 | 524 | rxrpc_queue_call(call); |
7727640c TS |
525 | goto free_unlock; |
526 | } | |
17926a79 DH |
527 | case RXRPC_CALL_REMOTELY_ABORTED: |
528 | case RXRPC_CALL_NETWORK_ERROR: | |
529 | case RXRPC_CALL_DEAD: | |
7727640c TS |
530 | goto dead_call; |
531 | case RXRPC_CALL_COMPLETE: | |
532 | case RXRPC_CALL_CLIENT_FINAL_ACK: | |
533 | /* complete server call */ | |
534 | if (call->conn->in_clientflag) | |
535 | goto dead_call; | |
536 | /* resend last packet of a completed call */ | |
537 | _debug("final ack again"); | |
538 | rxrpc_get_call(call); | |
4c198ad1 | 539 | set_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events); |
7727640c | 540 | rxrpc_queue_call(call); |
17926a79 DH |
541 | goto free_unlock; |
542 | default: | |
543 | break; | |
544 | } | |
545 | ||
546 | read_unlock(&call->state_lock); | |
547 | rxrpc_get_call(call); | |
17926a79 DH |
548 | |
549 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
550 | sp->hdr.flags & RXRPC_JUMBO_PACKET) | |
551 | rxrpc_process_jumbo_packet(call, skb); | |
552 | else | |
553 | rxrpc_fast_process_packet(call, skb); | |
554 | ||
555 | rxrpc_put_call(call); | |
556 | goto done; | |
557 | ||
17926a79 | 558 | dead_call: |
b6f3a40c TS |
559 | if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) { |
560 | skb->priority = RX_CALL_DEAD; | |
7727640c TS |
561 | rxrpc_reject_packet(call->conn->trans->local, skb); |
562 | goto unlock; | |
17926a79 | 563 | } |
17926a79 | 564 | free_unlock: |
17926a79 | 565 | rxrpc_free_skb(skb); |
7727640c TS |
566 | unlock: |
567 | read_unlock(&call->state_lock); | |
17926a79 DH |
568 | done: |
569 | _leave(""); | |
570 | } | |
571 | ||
572 | /* | |
573 | * post connection-level events to the connection | |
574 | * - this includes challenges, responses and some aborts | |
575 | */ | |
576 | static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, | |
577 | struct sk_buff *skb) | |
578 | { | |
579 | _enter("%p,%p", conn, skb); | |
580 | ||
581 | atomic_inc(&conn->usage); | |
582 | skb_queue_tail(&conn->rx_queue, skb); | |
651350d1 | 583 | rxrpc_queue_conn(conn); |
17926a79 DH |
584 | } |
585 | ||
44ba0698 DH |
586 | /* |
587 | * post endpoint-level events to the local endpoint | |
588 | * - this includes debug and version messages | |
589 | */ | |
590 | static void rxrpc_post_packet_to_local(struct rxrpc_local *local, | |
591 | struct sk_buff *skb) | |
592 | { | |
593 | _enter("%p,%p", local, skb); | |
594 | ||
595 | atomic_inc(&local->usage); | |
596 | skb_queue_tail(&local->event_queue, skb); | |
597 | rxrpc_queue_work(&local->event_processor); | |
598 | } | |
599 | ||
0d12f8a4 DH |
600 | /* |
601 | * Extract the wire header from a packet and translate the byte order. | |
602 | */ | |
603 | static noinline | |
604 | int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb) | |
605 | { | |
606 | struct rxrpc_wire_header whdr; | |
607 | ||
608 | /* dig out the RxRPC connection details */ | |
4d0fc73e | 609 | if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) |
0d12f8a4 | 610 | return -EBADMSG; |
4d0fc73e | 611 | if (!pskb_pull(skb, sizeof(whdr))) |
0d12f8a4 DH |
612 | BUG(); |
613 | ||
614 | memset(sp, 0, sizeof(*sp)); | |
615 | sp->hdr.epoch = ntohl(whdr.epoch); | |
616 | sp->hdr.cid = ntohl(whdr.cid); | |
617 | sp->hdr.callNumber = ntohl(whdr.callNumber); | |
618 | sp->hdr.seq = ntohl(whdr.seq); | |
619 | sp->hdr.serial = ntohl(whdr.serial); | |
620 | sp->hdr.flags = whdr.flags; | |
621 | sp->hdr.type = whdr.type; | |
622 | sp->hdr.userStatus = whdr.userStatus; | |
623 | sp->hdr.securityIndex = whdr.securityIndex; | |
624 | sp->hdr._rsvd = ntohs(whdr._rsvd); | |
625 | sp->hdr.serviceId = ntohs(whdr.serviceId); | |
626 | return 0; | |
627 | } | |
628 | ||
7727640c TS |
629 | static struct rxrpc_connection *rxrpc_conn_from_local(struct rxrpc_local *local, |
630 | struct sk_buff *skb, | |
631 | struct rxrpc_skb_priv *sp) | |
632 | { | |
633 | struct rxrpc_peer *peer; | |
634 | struct rxrpc_transport *trans; | |
635 | struct rxrpc_connection *conn; | |
636 | ||
637 | peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr, | |
638 | udp_hdr(skb)->source); | |
639 | if (IS_ERR(peer)) | |
640 | goto cant_find_conn; | |
641 | ||
642 | trans = rxrpc_find_transport(local, peer); | |
643 | rxrpc_put_peer(peer); | |
644 | if (!trans) | |
645 | goto cant_find_conn; | |
646 | ||
647 | conn = rxrpc_find_connection(trans, &sp->hdr); | |
648 | rxrpc_put_transport(trans); | |
649 | if (!conn) | |
650 | goto cant_find_conn; | |
651 | ||
652 | return conn; | |
653 | cant_find_conn: | |
654 | return NULL; | |
655 | } | |
656 | ||
17926a79 DH |
657 | /* |
658 | * handle data received on the local endpoint | |
659 | * - may be called in interrupt context | |
660 | */ | |
676d2369 | 661 | void rxrpc_data_ready(struct sock *sk) |
17926a79 | 662 | { |
17926a79 DH |
663 | struct rxrpc_skb_priv *sp; |
664 | struct rxrpc_local *local; | |
17926a79 DH |
665 | struct sk_buff *skb; |
666 | int ret; | |
667 | ||
676d2369 | 668 | _enter("%p", sk); |
17926a79 DH |
669 | |
670 | ASSERT(!irqs_disabled()); | |
671 | ||
672 | read_lock_bh(&rxrpc_local_lock); | |
673 | local = sk->sk_user_data; | |
674 | if (local && atomic_read(&local->usage) > 0) | |
675 | rxrpc_get_local(local); | |
676 | else | |
677 | local = NULL; | |
678 | read_unlock_bh(&rxrpc_local_lock); | |
679 | if (!local) { | |
680 | _leave(" [local dead]"); | |
681 | return; | |
682 | } | |
683 | ||
684 | skb = skb_recv_datagram(sk, 0, 1, &ret); | |
685 | if (!skb) { | |
686 | rxrpc_put_local(local); | |
687 | if (ret == -EAGAIN) | |
688 | return; | |
689 | _debug("UDP socket error %d", ret); | |
690 | return; | |
691 | } | |
692 | ||
693 | rxrpc_new_skb(skb); | |
694 | ||
695 | _net("recv skb %p", skb); | |
696 | ||
697 | /* we'll probably need to checksum it (didn't call sock_recvmsg) */ | |
698 | if (skb_checksum_complete(skb)) { | |
699 | rxrpc_free_skb(skb); | |
700 | rxrpc_put_local(local); | |
0283328e | 701 | UDP_INC_STATS_BH(&init_net, UDP_MIB_INERRORS, 0); |
17926a79 DH |
702 | _leave(" [CSUM failed]"); |
703 | return; | |
704 | } | |
705 | ||
0283328e | 706 | UDP_INC_STATS_BH(&init_net, UDP_MIB_INDATAGRAMS, 0); |
1781f7f5 | 707 | |
0d12f8a4 DH |
708 | /* The socket buffer we have is owned by UDP, with UDP's data all over |
709 | * it, but we really want our own data there. | |
710 | */ | |
17926a79 DH |
711 | skb_orphan(skb); |
712 | sp = rxrpc_skb(skb); | |
17926a79 DH |
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 */ | |
0d12f8a4 | 718 | if (rxrpc_extract_header(sp, skb) < 0) |
17926a79 | 719 | goto bad_message; |
17926a79 DH |
720 | |
721 | _net("Rx RxRPC %s ep=%x call=%x:%x", | |
722 | sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient", | |
0d12f8a4 | 723 | sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber); |
17926a79 | 724 | |
351c1e64 DH |
725 | if (sp->hdr.type >= RXRPC_N_PACKET_TYPES || |
726 | !((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) { | |
17926a79 DH |
727 | _proto("Rx Bad Packet Type %u", sp->hdr.type); |
728 | goto bad_message; | |
729 | } | |
730 | ||
44ba0698 DH |
731 | if (sp->hdr.type == RXRPC_PACKET_TYPE_VERSION) { |
732 | rxrpc_post_packet_to_local(local, skb); | |
733 | goto out; | |
734 | } | |
735 | ||
17926a79 DH |
736 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && |
737 | (sp->hdr.callNumber == 0 || sp->hdr.seq == 0)) | |
738 | goto bad_message; | |
739 | ||
7727640c TS |
740 | if (sp->hdr.callNumber == 0) { |
741 | /* This is a connection-level packet. These should be | |
742 | * fairly rare, so the extra overhead of looking them up the | |
743 | * old-fashioned way doesn't really hurt */ | |
744 | struct rxrpc_connection *conn; | |
17926a79 | 745 | |
7727640c TS |
746 | conn = rxrpc_conn_from_local(local, skb, sp); |
747 | if (!conn) | |
748 | goto cant_route_call; | |
17926a79 | 749 | |
7727640c | 750 | _debug("CONN %p {%d}", conn, conn->debug_id); |
17926a79 | 751 | rxrpc_post_packet_to_conn(conn, skb); |
7727640c TS |
752 | rxrpc_put_connection(conn); |
753 | } else { | |
754 | struct rxrpc_call *call; | |
0d12f8a4 DH |
755 | |
756 | call = rxrpc_find_call_hash(&sp->hdr, local, | |
757 | AF_INET, &ip_hdr(skb)->saddr); | |
7727640c TS |
758 | if (call) |
759 | rxrpc_post_packet_to_call(call, skb); | |
760 | else | |
761 | goto cant_route_call; | |
762 | } | |
44ba0698 DH |
763 | |
764 | out: | |
17926a79 DH |
765 | rxrpc_put_local(local); |
766 | return; | |
767 | ||
768 | cant_route_call: | |
769 | _debug("can't route call"); | |
770 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED && | |
771 | sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { | |
0d12f8a4 | 772 | if (sp->hdr.seq == 1) { |
17926a79 DH |
773 | _debug("first packet"); |
774 | skb_queue_tail(&local->accept_queue, skb); | |
651350d1 | 775 | rxrpc_queue_work(&local->acceptor); |
17926a79 DH |
776 | rxrpc_put_local(local); |
777 | _leave(" [incoming]"); | |
778 | return; | |
779 | } | |
780 | skb->priority = RX_INVALID_OPERATION; | |
781 | } else { | |
782 | skb->priority = RX_CALL_DEAD; | |
783 | } | |
784 | ||
b6f3a40c TS |
785 | if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) { |
786 | _debug("reject type %d",sp->hdr.type); | |
787 | rxrpc_reject_packet(local, skb); | |
788 | } | |
17926a79 DH |
789 | rxrpc_put_local(local); |
790 | _leave(" [no call]"); | |
791 | return; | |
792 | ||
793 | bad_message: | |
794 | skb->priority = RX_PROTOCOL_ERROR; | |
795 | rxrpc_reject_packet(local, skb); | |
796 | rxrpc_put_local(local); | |
797 | _leave(" [badmsg]"); | |
798 | } |