Commit | Line | Data |
---|---|---|
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 | const char *rxrpc_pkts[] = { |
29 | "?00", | |
30 | "DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG", | |
44ba0698 | 31 | "?09", "?10", "?11", "?12", "VERSION", "?14", "?15" |
17926a79 DH |
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 | 47 | struct sock *sk; |
884cf705 | 48 | int ret; |
17926a79 DH |
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 >= | |
95c96174 | 77 | // (unsigned int) sk->sk_rcvbuf) |
17926a79 DH |
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 { | |
651350d1 DH |
104 | _net("post skb %p", skb); |
105 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
106 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
107 | ||
108 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 109 | sk->sk_data_ready(sk); |
651350d1 | 110 | } |
17926a79 DH |
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); | |
68c708fd | 165 | if (__test_and_set_bit(ackbit, call->ackr_window)) { |
17926a79 DH |
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); | |
68c708fd | 174 | __clear_bit(ackbit, call->ackr_window); |
17926a79 DH |
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) { | |
68c708fd | 212 | __clear_bit(ackbit, call->ackr_window); |
17926a79 DH |
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 && | |
4c198ad1 | 234 | !test_and_set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events)) |
651350d1 | 235 | rxrpc_queue_call(call); |
17926a79 DH |
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) | |
651350d1 | 270 | rxrpc_queue_call(call); |
17926a79 DH |
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); | |
4c198ad1 | 290 | set_bit(RXRPC_CALL_EV_RCVD_ACKALL, &call->events); |
17926a79 DH |
291 | write_unlock_bh(&call->state_lock); |
292 | ||
293 | if (try_to_del_timer_sync(&call->resend_timer) >= 0) { | |
4c198ad1 DH |
294 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
295 | clear_bit(RXRPC_CALL_EV_RESEND, &call->events); | |
17926a79 DH |
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); | |
0d12f8a4 DH |
313 | __be32 wtmp; |
314 | u32 hi_serial, abort_code; | |
17926a79 DH |
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 */ | |
17926a79 | 333 | hi_serial = atomic_read(&call->conn->hi_serial); |
0d12f8a4 | 334 | while (sp->hdr.serial > hi_serial) |
17926a79 | 335 | hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial, |
0d12f8a4 | 336 | sp->hdr.serial); |
17926a79 DH |
337 | |
338 | /* request ACK generation for any ACK or DATA packet that requests | |
339 | * it */ | |
340 | if (sp->hdr.flags & RXRPC_REQUEST_ACK) { | |
0d12f8a4 | 341 | _proto("ACK Requested on %%%u", sp->hdr.serial); |
9823f39a | 342 | rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial, false); |
17926a79 DH |
343 | } |
344 | ||
345 | switch (sp->hdr.type) { | |
346 | case RXRPC_PACKET_TYPE_ABORT: | |
347 | _debug("abort"); | |
348 | ||
0d12f8a4 | 349 | if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0) |
17926a79 DH |
350 | goto protocol_error; |
351 | ||
0d12f8a4 DH |
352 | abort_code = ntohl(wtmp); |
353 | _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code); | |
17926a79 DH |
354 | |
355 | write_lock_bh(&call->state_lock); | |
356 | if (call->state < RXRPC_CALL_COMPLETE) { | |
357 | call->state = RXRPC_CALL_REMOTELY_ABORTED; | |
358 | call->abort_code = abort_code; | |
4c198ad1 | 359 | set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); |
651350d1 | 360 | rxrpc_queue_call(call); |
17926a79 DH |
361 | } |
362 | goto free_packet_unlock; | |
363 | ||
364 | case RXRPC_PACKET_TYPE_BUSY: | |
0d12f8a4 | 365 | _proto("Rx BUSY %%%u", sp->hdr.serial); |
17926a79 DH |
366 | |
367 | if (call->conn->out_clientflag) | |
368 | goto protocol_error; | |
369 | ||
370 | write_lock_bh(&call->state_lock); | |
371 | switch (call->state) { | |
372 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
373 | call->state = RXRPC_CALL_SERVER_BUSY; | |
4c198ad1 | 374 | set_bit(RXRPC_CALL_EV_RCVD_BUSY, &call->events); |
651350d1 | 375 | rxrpc_queue_call(call); |
17926a79 DH |
376 | case RXRPC_CALL_SERVER_BUSY: |
377 | goto free_packet_unlock; | |
378 | default: | |
379 | goto protocol_error_locked; | |
380 | } | |
381 | ||
382 | default: | |
0d12f8a4 | 383 | _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], sp->hdr.serial); |
17926a79 DH |
384 | goto protocol_error; |
385 | ||
386 | case RXRPC_PACKET_TYPE_DATA: | |
0d12f8a4 | 387 | _proto("Rx DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq); |
17926a79 | 388 | |
0d12f8a4 | 389 | if (sp->hdr.seq == 0) |
17926a79 DH |
390 | goto protocol_error; |
391 | ||
392 | call->ackr_prev_seq = sp->hdr.seq; | |
393 | ||
394 | /* received data implicitly ACKs all of the request packets we | |
395 | * sent when we're acting as a client */ | |
396 | if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) | |
0d12f8a4 | 397 | rxrpc_assume_implicit_ackall(call, sp->hdr.serial); |
17926a79 | 398 | |
0d12f8a4 | 399 | switch (rxrpc_fast_process_data(call, skb, sp->hdr.seq)) { |
17926a79 DH |
400 | case 0: |
401 | skb = NULL; | |
402 | goto done; | |
403 | ||
404 | default: | |
405 | BUG(); | |
406 | ||
407 | /* data packet received beyond the last packet */ | |
408 | case -EBADMSG: | |
409 | goto protocol_error; | |
410 | } | |
411 | ||
10003453 | 412 | case RXRPC_PACKET_TYPE_ACKALL: |
17926a79 DH |
413 | case RXRPC_PACKET_TYPE_ACK: |
414 | /* ACK processing is done in process context */ | |
415 | read_lock_bh(&call->state_lock); | |
416 | if (call->state < RXRPC_CALL_DEAD) { | |
417 | skb_queue_tail(&call->rx_queue, skb); | |
651350d1 | 418 | rxrpc_queue_call(call); |
17926a79 DH |
419 | skb = NULL; |
420 | } | |
421 | read_unlock_bh(&call->state_lock); | |
422 | goto free_packet; | |
423 | } | |
424 | ||
425 | protocol_error: | |
426 | _debug("protocol error"); | |
427 | write_lock_bh(&call->state_lock); | |
428 | protocol_error_locked: | |
429 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
430 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
431 | call->abort_code = RX_PROTOCOL_ERROR; | |
4c198ad1 | 432 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
651350d1 | 433 | rxrpc_queue_call(call); |
17926a79 DH |
434 | } |
435 | free_packet_unlock: | |
436 | write_unlock_bh(&call->state_lock); | |
437 | free_packet: | |
438 | rxrpc_free_skb(skb); | |
439 | done: | |
440 | _leave(""); | |
441 | } | |
442 | ||
443 | /* | |
444 | * split up a jumbo data packet | |
445 | */ | |
446 | static void rxrpc_process_jumbo_packet(struct rxrpc_call *call, | |
447 | struct sk_buff *jumbo) | |
448 | { | |
449 | struct rxrpc_jumbo_header jhdr; | |
450 | struct rxrpc_skb_priv *sp; | |
451 | struct sk_buff *part; | |
452 | ||
453 | _enter(",{%u,%u}", jumbo->data_len, jumbo->len); | |
454 | ||
455 | sp = rxrpc_skb(jumbo); | |
456 | ||
457 | do { | |
458 | sp->hdr.flags &= ~RXRPC_JUMBO_PACKET; | |
459 | ||
460 | /* make a clone to represent the first subpacket in what's left | |
461 | * of the jumbo packet */ | |
462 | part = skb_clone(jumbo, GFP_ATOMIC); | |
463 | if (!part) { | |
464 | /* simply ditch the tail in the event of ENOMEM */ | |
465 | pskb_trim(jumbo, RXRPC_JUMBO_DATALEN); | |
466 | break; | |
467 | } | |
468 | rxrpc_new_skb(part); | |
469 | ||
470 | pskb_trim(part, RXRPC_JUMBO_DATALEN); | |
471 | ||
472 | if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN)) | |
473 | goto protocol_error; | |
474 | ||
475 | if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0) | |
476 | goto protocol_error; | |
477 | if (!pskb_pull(jumbo, sizeof(jhdr))) | |
478 | BUG(); | |
479 | ||
0d12f8a4 DH |
480 | sp->hdr.seq += 1; |
481 | sp->hdr.serial += 1; | |
17926a79 DH |
482 | sp->hdr.flags = jhdr.flags; |
483 | sp->hdr._rsvd = jhdr._rsvd; | |
484 | ||
0d12f8a4 | 485 | _proto("Rx DATA Jumbo %%%u", sp->hdr.serial - 1); |
17926a79 DH |
486 | |
487 | rxrpc_fast_process_packet(call, part); | |
488 | part = NULL; | |
489 | ||
490 | } while (sp->hdr.flags & RXRPC_JUMBO_PACKET); | |
491 | ||
492 | rxrpc_fast_process_packet(call, jumbo); | |
493 | _leave(""); | |
494 | return; | |
495 | ||
496 | protocol_error: | |
497 | _debug("protocol error"); | |
498 | rxrpc_free_skb(part); | |
499 | rxrpc_free_skb(jumbo); | |
500 | write_lock_bh(&call->state_lock); | |
501 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
502 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
503 | call->abort_code = RX_PROTOCOL_ERROR; | |
4c198ad1 | 504 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
651350d1 | 505 | rxrpc_queue_call(call); |
17926a79 DH |
506 | } |
507 | write_unlock_bh(&call->state_lock); | |
508 | _leave(""); | |
509 | } | |
510 | ||
511 | /* | |
512 | * post an incoming packet to the appropriate call/socket to deal with | |
513 | * - must get rid of the sk_buff, either by freeing it or by queuing it | |
514 | */ | |
7727640c | 515 | static void rxrpc_post_packet_to_call(struct rxrpc_call *call, |
17926a79 DH |
516 | struct sk_buff *skb) |
517 | { | |
518 | struct rxrpc_skb_priv *sp; | |
17926a79 | 519 | |
7727640c | 520 | _enter("%p,%p", call, skb); |
17926a79 DH |
521 | |
522 | sp = rxrpc_skb(skb); | |
523 | ||
17926a79 | 524 | _debug("extant call [%d]", call->state); |
17926a79 DH |
525 | |
526 | read_lock(&call->state_lock); | |
527 | switch (call->state) { | |
528 | case RXRPC_CALL_LOCALLY_ABORTED: | |
4c198ad1 | 529 | if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events)) { |
651350d1 | 530 | rxrpc_queue_call(call); |
7727640c TS |
531 | goto free_unlock; |
532 | } | |
17926a79 DH |
533 | case RXRPC_CALL_REMOTELY_ABORTED: |
534 | case RXRPC_CALL_NETWORK_ERROR: | |
535 | case RXRPC_CALL_DEAD: | |
7727640c TS |
536 | goto dead_call; |
537 | case RXRPC_CALL_COMPLETE: | |
538 | case RXRPC_CALL_CLIENT_FINAL_ACK: | |
539 | /* complete server call */ | |
540 | if (call->conn->in_clientflag) | |
541 | goto dead_call; | |
542 | /* resend last packet of a completed call */ | |
543 | _debug("final ack again"); | |
544 | rxrpc_get_call(call); | |
4c198ad1 | 545 | set_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events); |
7727640c | 546 | rxrpc_queue_call(call); |
17926a79 DH |
547 | goto free_unlock; |
548 | default: | |
549 | break; | |
550 | } | |
551 | ||
552 | read_unlock(&call->state_lock); | |
553 | rxrpc_get_call(call); | |
17926a79 DH |
554 | |
555 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
556 | sp->hdr.flags & RXRPC_JUMBO_PACKET) | |
557 | rxrpc_process_jumbo_packet(call, skb); | |
558 | else | |
559 | rxrpc_fast_process_packet(call, skb); | |
560 | ||
561 | rxrpc_put_call(call); | |
562 | goto done; | |
563 | ||
17926a79 | 564 | dead_call: |
b6f3a40c TS |
565 | if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) { |
566 | skb->priority = RX_CALL_DEAD; | |
7727640c TS |
567 | rxrpc_reject_packet(call->conn->trans->local, skb); |
568 | goto unlock; | |
17926a79 | 569 | } |
17926a79 | 570 | free_unlock: |
17926a79 | 571 | rxrpc_free_skb(skb); |
7727640c TS |
572 | unlock: |
573 | read_unlock(&call->state_lock); | |
17926a79 DH |
574 | done: |
575 | _leave(""); | |
576 | } | |
577 | ||
578 | /* | |
579 | * post connection-level events to the connection | |
580 | * - this includes challenges, responses and some aborts | |
581 | */ | |
582 | static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, | |
583 | struct sk_buff *skb) | |
584 | { | |
585 | _enter("%p,%p", conn, skb); | |
586 | ||
587 | atomic_inc(&conn->usage); | |
588 | skb_queue_tail(&conn->rx_queue, skb); | |
651350d1 | 589 | rxrpc_queue_conn(conn); |
17926a79 DH |
590 | } |
591 | ||
44ba0698 DH |
592 | /* |
593 | * post endpoint-level events to the local endpoint | |
594 | * - this includes debug and version messages | |
595 | */ | |
596 | static void rxrpc_post_packet_to_local(struct rxrpc_local *local, | |
597 | struct sk_buff *skb) | |
598 | { | |
599 | _enter("%p,%p", local, skb); | |
600 | ||
601 | atomic_inc(&local->usage); | |
602 | skb_queue_tail(&local->event_queue, skb); | |
603 | rxrpc_queue_work(&local->event_processor); | |
604 | } | |
605 | ||
0d12f8a4 DH |
606 | /* |
607 | * Extract the wire header from a packet and translate the byte order. | |
608 | */ | |
609 | static noinline | |
610 | int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb) | |
611 | { | |
612 | struct rxrpc_wire_header whdr; | |
613 | ||
614 | /* dig out the RxRPC connection details */ | |
615 | if (skb_copy_bits(skb, sizeof(struct udphdr), &whdr, sizeof(whdr)) < 0) | |
616 | return -EBADMSG; | |
617 | if (!pskb_pull(skb, sizeof(struct udphdr) + sizeof(whdr))) | |
618 | BUG(); | |
619 | ||
620 | memset(sp, 0, sizeof(*sp)); | |
621 | sp->hdr.epoch = ntohl(whdr.epoch); | |
622 | sp->hdr.cid = ntohl(whdr.cid); | |
623 | sp->hdr.callNumber = ntohl(whdr.callNumber); | |
624 | sp->hdr.seq = ntohl(whdr.seq); | |
625 | sp->hdr.serial = ntohl(whdr.serial); | |
626 | sp->hdr.flags = whdr.flags; | |
627 | sp->hdr.type = whdr.type; | |
628 | sp->hdr.userStatus = whdr.userStatus; | |
629 | sp->hdr.securityIndex = whdr.securityIndex; | |
630 | sp->hdr._rsvd = ntohs(whdr._rsvd); | |
631 | sp->hdr.serviceId = ntohs(whdr.serviceId); | |
632 | return 0; | |
633 | } | |
634 | ||
7727640c TS |
635 | static struct rxrpc_connection *rxrpc_conn_from_local(struct rxrpc_local *local, |
636 | struct sk_buff *skb, | |
637 | struct rxrpc_skb_priv *sp) | |
638 | { | |
639 | struct rxrpc_peer *peer; | |
640 | struct rxrpc_transport *trans; | |
641 | struct rxrpc_connection *conn; | |
642 | ||
643 | peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr, | |
644 | udp_hdr(skb)->source); | |
645 | if (IS_ERR(peer)) | |
646 | goto cant_find_conn; | |
647 | ||
648 | trans = rxrpc_find_transport(local, peer); | |
649 | rxrpc_put_peer(peer); | |
650 | if (!trans) | |
651 | goto cant_find_conn; | |
652 | ||
653 | conn = rxrpc_find_connection(trans, &sp->hdr); | |
654 | rxrpc_put_transport(trans); | |
655 | if (!conn) | |
656 | goto cant_find_conn; | |
657 | ||
658 | return conn; | |
659 | cant_find_conn: | |
660 | return NULL; | |
661 | } | |
662 | ||
17926a79 DH |
663 | /* |
664 | * handle data received on the local endpoint | |
665 | * - may be called in interrupt context | |
666 | */ | |
676d2369 | 667 | void rxrpc_data_ready(struct sock *sk) |
17926a79 | 668 | { |
17926a79 DH |
669 | struct rxrpc_skb_priv *sp; |
670 | struct rxrpc_local *local; | |
17926a79 DH |
671 | struct sk_buff *skb; |
672 | int ret; | |
673 | ||
676d2369 | 674 | _enter("%p", sk); |
17926a79 DH |
675 | |
676 | ASSERT(!irqs_disabled()); | |
677 | ||
678 | read_lock_bh(&rxrpc_local_lock); | |
679 | local = sk->sk_user_data; | |
680 | if (local && atomic_read(&local->usage) > 0) | |
681 | rxrpc_get_local(local); | |
682 | else | |
683 | local = NULL; | |
684 | read_unlock_bh(&rxrpc_local_lock); | |
685 | if (!local) { | |
686 | _leave(" [local dead]"); | |
687 | return; | |
688 | } | |
689 | ||
690 | skb = skb_recv_datagram(sk, 0, 1, &ret); | |
691 | if (!skb) { | |
692 | rxrpc_put_local(local); | |
693 | if (ret == -EAGAIN) | |
694 | return; | |
695 | _debug("UDP socket error %d", ret); | |
696 | return; | |
697 | } | |
698 | ||
699 | rxrpc_new_skb(skb); | |
700 | ||
701 | _net("recv skb %p", skb); | |
702 | ||
703 | /* we'll probably need to checksum it (didn't call sock_recvmsg) */ | |
704 | if (skb_checksum_complete(skb)) { | |
705 | rxrpc_free_skb(skb); | |
706 | rxrpc_put_local(local); | |
0283328e | 707 | UDP_INC_STATS_BH(&init_net, UDP_MIB_INERRORS, 0); |
17926a79 DH |
708 | _leave(" [CSUM failed]"); |
709 | return; | |
710 | } | |
711 | ||
0283328e | 712 | UDP_INC_STATS_BH(&init_net, UDP_MIB_INDATAGRAMS, 0); |
1781f7f5 | 713 | |
0d12f8a4 DH |
714 | /* The socket buffer we have is owned by UDP, with UDP's data all over |
715 | * it, but we really want our own data there. | |
716 | */ | |
17926a79 DH |
717 | skb_orphan(skb); |
718 | sp = rxrpc_skb(skb); | |
17926a79 DH |
719 | |
720 | _net("Rx UDP packet from %08x:%04hu", | |
721 | ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source)); | |
722 | ||
723 | /* dig out the RxRPC connection details */ | |
0d12f8a4 | 724 | if (rxrpc_extract_header(sp, skb) < 0) |
17926a79 | 725 | goto bad_message; |
17926a79 DH |
726 | |
727 | _net("Rx RxRPC %s ep=%x call=%x:%x", | |
728 | sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient", | |
0d12f8a4 | 729 | sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber); |
17926a79 | 730 | |
351c1e64 DH |
731 | if (sp->hdr.type >= RXRPC_N_PACKET_TYPES || |
732 | !((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) { | |
17926a79 DH |
733 | _proto("Rx Bad Packet Type %u", sp->hdr.type); |
734 | goto bad_message; | |
735 | } | |
736 | ||
44ba0698 DH |
737 | if (sp->hdr.type == RXRPC_PACKET_TYPE_VERSION) { |
738 | rxrpc_post_packet_to_local(local, skb); | |
739 | goto out; | |
740 | } | |
741 | ||
17926a79 DH |
742 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && |
743 | (sp->hdr.callNumber == 0 || sp->hdr.seq == 0)) | |
744 | goto bad_message; | |
745 | ||
7727640c TS |
746 | if (sp->hdr.callNumber == 0) { |
747 | /* This is a connection-level packet. These should be | |
748 | * fairly rare, so the extra overhead of looking them up the | |
749 | * old-fashioned way doesn't really hurt */ | |
750 | struct rxrpc_connection *conn; | |
17926a79 | 751 | |
7727640c TS |
752 | conn = rxrpc_conn_from_local(local, skb, sp); |
753 | if (!conn) | |
754 | goto cant_route_call; | |
17926a79 | 755 | |
7727640c | 756 | _debug("CONN %p {%d}", conn, conn->debug_id); |
17926a79 | 757 | rxrpc_post_packet_to_conn(conn, skb); |
7727640c TS |
758 | rxrpc_put_connection(conn); |
759 | } else { | |
760 | struct rxrpc_call *call; | |
0d12f8a4 DH |
761 | |
762 | call = rxrpc_find_call_hash(&sp->hdr, local, | |
763 | AF_INET, &ip_hdr(skb)->saddr); | |
7727640c TS |
764 | if (call) |
765 | rxrpc_post_packet_to_call(call, skb); | |
766 | else | |
767 | goto cant_route_call; | |
768 | } | |
44ba0698 DH |
769 | |
770 | out: | |
17926a79 DH |
771 | rxrpc_put_local(local); |
772 | return; | |
773 | ||
774 | cant_route_call: | |
775 | _debug("can't route call"); | |
776 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED && | |
777 | sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { | |
0d12f8a4 | 778 | if (sp->hdr.seq == 1) { |
17926a79 DH |
779 | _debug("first packet"); |
780 | skb_queue_tail(&local->accept_queue, skb); | |
651350d1 | 781 | rxrpc_queue_work(&local->acceptor); |
17926a79 DH |
782 | rxrpc_put_local(local); |
783 | _leave(" [incoming]"); | |
784 | return; | |
785 | } | |
786 | skb->priority = RX_INVALID_OPERATION; | |
787 | } else { | |
788 | skb->priority = RX_CALL_DEAD; | |
789 | } | |
790 | ||
b6f3a40c TS |
791 | if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) { |
792 | _debug("reject type %d",sp->hdr.type); | |
793 | rxrpc_reject_packet(local, skb); | |
794 | } | |
17926a79 DH |
795 | rxrpc_put_local(local); |
796 | _leave(" [no call]"); | |
797 | return; | |
798 | ||
799 | bad_message: | |
800 | skb->priority = RX_PROTOCOL_ERROR; | |
801 | rxrpc_reject_packet(local, skb); | |
802 | rxrpc_put_local(local); | |
803 | _leave(" [badmsg]"); | |
804 | } |