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 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 DH |
14 | #include <linux/module.h> |
15 | #include <linux/net.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/errqueue.h> | |
18 | #include <linux/udp.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/in6.h> | |
21 | #include <linux/icmp.h> | |
5a0e3ad6 | 22 | #include <linux/gfp.h> |
17926a79 DH |
23 | #include <net/sock.h> |
24 | #include <net/af_rxrpc.h> | |
25 | #include <net/ip.h> | |
1781f7f5 | 26 | #include <net/udp.h> |
0283328e | 27 | #include <net/net_namespace.h> |
17926a79 DH |
28 | #include "ar-internal.h" |
29 | ||
17926a79 DH |
30 | /* |
31 | * queue a packet for recvmsg to pass to userspace | |
32 | * - the caller must hold a lock on call->lock | |
33 | * - must not be called with interrupts disabled (sk_filter() disables BH's) | |
34 | * - eats the packet whether successful or not | |
35 | * - there must be just one reference to the packet, which the caller passes to | |
36 | * this function | |
37 | */ | |
38 | int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb, | |
39 | bool force, bool terminal) | |
40 | { | |
41 | struct rxrpc_skb_priv *sp; | |
651350d1 | 42 | struct rxrpc_sock *rx = call->socket; |
17926a79 | 43 | struct sock *sk; |
884cf705 | 44 | int ret; |
17926a79 DH |
45 | |
46 | _enter(",,%d,%d", force, terminal); | |
47 | ||
48 | ASSERT(!irqs_disabled()); | |
49 | ||
50 | sp = rxrpc_skb(skb); | |
51 | ASSERTCMP(sp->call, ==, call); | |
52 | ||
53 | /* if we've already posted the terminal message for a call, then we | |
54 | * don't post any more */ | |
55 | if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { | |
56 | _debug("already terminated"); | |
57 | ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE); | |
58 | skb->destructor = NULL; | |
59 | sp->call = NULL; | |
60 | rxrpc_put_call(call); | |
61 | rxrpc_free_skb(skb); | |
62 | return 0; | |
63 | } | |
64 | ||
651350d1 | 65 | sk = &rx->sk; |
17926a79 DH |
66 | |
67 | if (!force) { | |
68 | /* cast skb->rcvbuf to unsigned... It's pointless, but | |
69 | * reduces number of warnings when compiling with -W | |
70 | * --ANK */ | |
71 | // ret = -ENOBUFS; | |
72 | // if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
95c96174 | 73 | // (unsigned int) sk->sk_rcvbuf) |
17926a79 DH |
74 | // goto out; |
75 | ||
76 | ret = sk_filter(sk, skb); | |
77 | if (ret < 0) | |
78 | goto out; | |
79 | } | |
80 | ||
81 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
82 | if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) && | |
83 | !test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
84 | call->socket->sk.sk_state != RXRPC_CLOSE) { | |
85 | skb->destructor = rxrpc_packet_destructor; | |
86 | skb->dev = NULL; | |
87 | skb->sk = sk; | |
88 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
89 | ||
17926a79 DH |
90 | if (terminal) { |
91 | _debug("<<<< TERMINAL MESSAGE >>>>"); | |
92 | set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags); | |
93 | } | |
94 | ||
651350d1 DH |
95 | /* allow interception by a kernel service */ |
96 | if (rx->interceptor) { | |
97 | rx->interceptor(sk, call->user_call_ID, skb); | |
98 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
99 | } else { | |
651350d1 DH |
100 | _net("post skb %p", skb); |
101 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
102 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
103 | ||
104 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 105 | sk->sk_data_ready(sk); |
651350d1 | 106 | } |
17926a79 DH |
107 | skb = NULL; |
108 | } else { | |
109 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
110 | } | |
111 | ret = 0; | |
112 | ||
113 | out: | |
114 | /* release the socket buffer */ | |
115 | if (skb) { | |
116 | skb->destructor = NULL; | |
117 | sp->call = NULL; | |
118 | rxrpc_put_call(call); | |
119 | rxrpc_free_skb(skb); | |
120 | } | |
121 | ||
122 | _leave(" = %d", ret); | |
123 | return ret; | |
124 | } | |
125 | ||
126 | /* | |
127 | * process a DATA packet, posting the packet to the appropriate queue | |
128 | * - eats the packet if successful | |
129 | */ | |
130 | static int rxrpc_fast_process_data(struct rxrpc_call *call, | |
131 | struct sk_buff *skb, u32 seq) | |
132 | { | |
133 | struct rxrpc_skb_priv *sp; | |
134 | bool terminal; | |
135 | int ret, ackbit, ack; | |
136 | ||
137 | _enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq); | |
138 | ||
139 | sp = rxrpc_skb(skb); | |
140 | ASSERTCMP(sp->call, ==, NULL); | |
141 | ||
142 | spin_lock(&call->lock); | |
143 | ||
144 | if (call->state > RXRPC_CALL_COMPLETE) | |
145 | goto discard; | |
146 | ||
147 | ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post); | |
148 | ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv); | |
149 | ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten); | |
150 | ||
151 | if (seq < call->rx_data_post) { | |
152 | _debug("dup #%u [-%u]", seq, call->rx_data_post); | |
153 | ack = RXRPC_ACK_DUPLICATE; | |
154 | ret = -ENOBUFS; | |
155 | goto discard_and_ack; | |
156 | } | |
157 | ||
158 | /* we may already have the packet in the out of sequence queue */ | |
159 | ackbit = seq - (call->rx_data_eaten + 1); | |
160 | ASSERTCMP(ackbit, >=, 0); | |
68c708fd | 161 | if (__test_and_set_bit(ackbit, call->ackr_window)) { |
17926a79 DH |
162 | _debug("dup oos #%u [%u,%u]", |
163 | seq, call->rx_data_eaten, call->rx_data_post); | |
164 | ack = RXRPC_ACK_DUPLICATE; | |
165 | goto discard_and_ack; | |
166 | } | |
167 | ||
168 | if (seq >= call->ackr_win_top) { | |
169 | _debug("exceed #%u [%u]", seq, call->ackr_win_top); | |
68c708fd | 170 | __clear_bit(ackbit, call->ackr_window); |
17926a79 DH |
171 | ack = RXRPC_ACK_EXCEEDS_WINDOW; |
172 | goto discard_and_ack; | |
173 | } | |
174 | ||
175 | if (seq == call->rx_data_expect) { | |
176 | clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags); | |
177 | call->rx_data_expect++; | |
178 | } else if (seq > call->rx_data_expect) { | |
179 | _debug("oos #%u [%u]", seq, call->rx_data_expect); | |
180 | call->rx_data_expect = seq + 1; | |
181 | if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) { | |
182 | ack = RXRPC_ACK_OUT_OF_SEQUENCE; | |
183 | goto enqueue_and_ack; | |
184 | } | |
185 | goto enqueue_packet; | |
186 | } | |
187 | ||
188 | if (seq != call->rx_data_post) { | |
189 | _debug("ahead #%u [%u]", seq, call->rx_data_post); | |
190 | goto enqueue_packet; | |
191 | } | |
192 | ||
193 | if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags)) | |
194 | goto protocol_error; | |
195 | ||
196 | /* if the packet need security things doing to it, then it goes down | |
197 | * the slow path */ | |
e0e4d82f | 198 | if (call->conn->security_ix) |
17926a79 DH |
199 | goto enqueue_packet; |
200 | ||
201 | sp->call = call; | |
202 | rxrpc_get_call(call); | |
203 | terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && | |
204 | !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); | |
205 | ret = rxrpc_queue_rcv_skb(call, skb, false, terminal); | |
206 | if (ret < 0) { | |
207 | if (ret == -ENOMEM || ret == -ENOBUFS) { | |
68c708fd | 208 | __clear_bit(ackbit, call->ackr_window); |
17926a79 DH |
209 | ack = RXRPC_ACK_NOSPACE; |
210 | goto discard_and_ack; | |
211 | } | |
212 | goto out; | |
213 | } | |
214 | ||
215 | skb = NULL; | |
216 | ||
217 | _debug("post #%u", seq); | |
218 | ASSERTCMP(call->rx_data_post, ==, seq); | |
219 | call->rx_data_post++; | |
220 | ||
221 | if (sp->hdr.flags & RXRPC_LAST_PACKET) | |
222 | set_bit(RXRPC_CALL_RCVD_LAST, &call->flags); | |
223 | ||
224 | /* if we've reached an out of sequence packet then we need to drain | |
225 | * that queue into the socket Rx queue now */ | |
226 | if (call->rx_data_post == call->rx_first_oos) { | |
227 | _debug("drain rx oos now"); | |
228 | read_lock(&call->state_lock); | |
229 | if (call->state < RXRPC_CALL_COMPLETE && | |
4c198ad1 | 230 | !test_and_set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events)) |
651350d1 | 231 | rxrpc_queue_call(call); |
17926a79 DH |
232 | read_unlock(&call->state_lock); |
233 | } | |
234 | ||
235 | spin_unlock(&call->lock); | |
236 | atomic_inc(&call->ackr_not_idle); | |
237 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, sp->hdr.serial, false); | |
238 | _leave(" = 0 [posted]"); | |
239 | return 0; | |
240 | ||
241 | protocol_error: | |
242 | ret = -EBADMSG; | |
243 | out: | |
244 | spin_unlock(&call->lock); | |
245 | _leave(" = %d", ret); | |
246 | return ret; | |
247 | ||
248 | discard_and_ack: | |
249 | _debug("discard and ACK packet %p", skb); | |
250 | __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); | |
251 | discard: | |
252 | spin_unlock(&call->lock); | |
253 | rxrpc_free_skb(skb); | |
254 | _leave(" = 0 [discarded]"); | |
255 | return 0; | |
256 | ||
257 | enqueue_and_ack: | |
258 | __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); | |
259 | enqueue_packet: | |
260 | _net("defer skb %p", skb); | |
261 | spin_unlock(&call->lock); | |
262 | skb_queue_tail(&call->rx_queue, skb); | |
263 | atomic_inc(&call->ackr_not_idle); | |
264 | read_lock(&call->state_lock); | |
265 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 266 | rxrpc_queue_call(call); |
17926a79 DH |
267 | read_unlock(&call->state_lock); |
268 | _leave(" = 0 [queued]"); | |
269 | return 0; | |
270 | } | |
271 | ||
272 | /* | |
273 | * assume an implicit ACKALL of the transmission phase of a client socket upon | |
274 | * reception of the first reply packet | |
275 | */ | |
276 | static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial) | |
277 | { | |
278 | write_lock_bh(&call->state_lock); | |
279 | ||
280 | switch (call->state) { | |
281 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
282 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
283 | call->acks_latest = serial; | |
284 | ||
285 | _debug("implicit ACKALL %%%u", call->acks_latest); | |
4c198ad1 | 286 | set_bit(RXRPC_CALL_EV_RCVD_ACKALL, &call->events); |
17926a79 DH |
287 | write_unlock_bh(&call->state_lock); |
288 | ||
289 | if (try_to_del_timer_sync(&call->resend_timer) >= 0) { | |
4c198ad1 DH |
290 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
291 | clear_bit(RXRPC_CALL_EV_RESEND, &call->events); | |
17926a79 DH |
292 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
293 | } | |
294 | break; | |
295 | ||
296 | default: | |
297 | write_unlock_bh(&call->state_lock); | |
298 | break; | |
299 | } | |
300 | } | |
301 | ||
302 | /* | |
303 | * post an incoming packet to the nominated call to deal with | |
304 | * - must get rid of the sk_buff, either by freeing it or by queuing it | |
305 | */ | |
306 | void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb) | |
307 | { | |
308 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
0d12f8a4 DH |
309 | __be32 wtmp; |
310 | u32 hi_serial, abort_code; | |
17926a79 DH |
311 | |
312 | _enter("%p,%p", call, skb); | |
313 | ||
314 | ASSERT(!irqs_disabled()); | |
315 | ||
316 | #if 0 // INJECT RX ERROR | |
317 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { | |
318 | static int skip = 0; | |
319 | if (++skip == 3) { | |
320 | printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n"); | |
321 | skip = 0; | |
322 | goto free_packet; | |
323 | } | |
324 | } | |
325 | #endif | |
326 | ||
327 | /* track the latest serial number on this connection for ACK packet | |
328 | * information */ | |
17926a79 | 329 | hi_serial = atomic_read(&call->conn->hi_serial); |
0d12f8a4 | 330 | while (sp->hdr.serial > hi_serial) |
17926a79 | 331 | hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial, |
0d12f8a4 | 332 | sp->hdr.serial); |
17926a79 DH |
333 | |
334 | /* request ACK generation for any ACK or DATA packet that requests | |
335 | * it */ | |
336 | if (sp->hdr.flags & RXRPC_REQUEST_ACK) { | |
0d12f8a4 | 337 | _proto("ACK Requested on %%%u", sp->hdr.serial); |
9823f39a | 338 | rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial, false); |
17926a79 DH |
339 | } |
340 | ||
341 | switch (sp->hdr.type) { | |
342 | case RXRPC_PACKET_TYPE_ABORT: | |
343 | _debug("abort"); | |
344 | ||
0d12f8a4 | 345 | if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0) |
17926a79 DH |
346 | goto protocol_error; |
347 | ||
0d12f8a4 DH |
348 | abort_code = ntohl(wtmp); |
349 | _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code); | |
17926a79 DH |
350 | |
351 | write_lock_bh(&call->state_lock); | |
352 | if (call->state < RXRPC_CALL_COMPLETE) { | |
353 | call->state = RXRPC_CALL_REMOTELY_ABORTED; | |
dc44b3a0 | 354 | call->remote_abort = abort_code; |
4c198ad1 | 355 | set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); |
651350d1 | 356 | rxrpc_queue_call(call); |
17926a79 DH |
357 | } |
358 | goto free_packet_unlock; | |
359 | ||
360 | case RXRPC_PACKET_TYPE_BUSY: | |
0d12f8a4 | 361 | _proto("Rx BUSY %%%u", sp->hdr.serial); |
17926a79 | 362 | |
19ffa01c | 363 | if (rxrpc_conn_is_service(call->conn)) |
17926a79 DH |
364 | goto protocol_error; |
365 | ||
366 | write_lock_bh(&call->state_lock); | |
367 | switch (call->state) { | |
368 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
369 | call->state = RXRPC_CALL_SERVER_BUSY; | |
4c198ad1 | 370 | set_bit(RXRPC_CALL_EV_RCVD_BUSY, &call->events); |
651350d1 | 371 | rxrpc_queue_call(call); |
17926a79 DH |
372 | case RXRPC_CALL_SERVER_BUSY: |
373 | goto free_packet_unlock; | |
374 | default: | |
375 | goto protocol_error_locked; | |
376 | } | |
377 | ||
378 | default: | |
0d12f8a4 | 379 | _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], sp->hdr.serial); |
17926a79 DH |
380 | goto protocol_error; |
381 | ||
382 | case RXRPC_PACKET_TYPE_DATA: | |
0d12f8a4 | 383 | _proto("Rx DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq); |
17926a79 | 384 | |
0d12f8a4 | 385 | if (sp->hdr.seq == 0) |
17926a79 DH |
386 | goto protocol_error; |
387 | ||
388 | call->ackr_prev_seq = sp->hdr.seq; | |
389 | ||
390 | /* received data implicitly ACKs all of the request packets we | |
391 | * sent when we're acting as a client */ | |
392 | if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) | |
0d12f8a4 | 393 | rxrpc_assume_implicit_ackall(call, sp->hdr.serial); |
17926a79 | 394 | |
0d12f8a4 | 395 | switch (rxrpc_fast_process_data(call, skb, sp->hdr.seq)) { |
17926a79 DH |
396 | case 0: |
397 | skb = NULL; | |
398 | goto done; | |
399 | ||
400 | default: | |
401 | BUG(); | |
402 | ||
403 | /* data packet received beyond the last packet */ | |
404 | case -EBADMSG: | |
405 | goto protocol_error; | |
406 | } | |
407 | ||
10003453 | 408 | case RXRPC_PACKET_TYPE_ACKALL: |
17926a79 DH |
409 | case RXRPC_PACKET_TYPE_ACK: |
410 | /* ACK processing is done in process context */ | |
411 | read_lock_bh(&call->state_lock); | |
412 | if (call->state < RXRPC_CALL_DEAD) { | |
413 | skb_queue_tail(&call->rx_queue, skb); | |
651350d1 | 414 | rxrpc_queue_call(call); |
17926a79 DH |
415 | skb = NULL; |
416 | } | |
417 | read_unlock_bh(&call->state_lock); | |
418 | goto free_packet; | |
419 | } | |
420 | ||
421 | protocol_error: | |
422 | _debug("protocol error"); | |
423 | write_lock_bh(&call->state_lock); | |
424 | protocol_error_locked: | |
425 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
426 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
dc44b3a0 | 427 | call->local_abort = RX_PROTOCOL_ERROR; |
4c198ad1 | 428 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
651350d1 | 429 | rxrpc_queue_call(call); |
17926a79 DH |
430 | } |
431 | free_packet_unlock: | |
432 | write_unlock_bh(&call->state_lock); | |
433 | free_packet: | |
434 | rxrpc_free_skb(skb); | |
435 | done: | |
436 | _leave(""); | |
437 | } | |
438 | ||
439 | /* | |
440 | * split up a jumbo data packet | |
441 | */ | |
442 | static void rxrpc_process_jumbo_packet(struct rxrpc_call *call, | |
443 | struct sk_buff *jumbo) | |
444 | { | |
445 | struct rxrpc_jumbo_header jhdr; | |
446 | struct rxrpc_skb_priv *sp; | |
447 | struct sk_buff *part; | |
448 | ||
449 | _enter(",{%u,%u}", jumbo->data_len, jumbo->len); | |
450 | ||
451 | sp = rxrpc_skb(jumbo); | |
452 | ||
453 | do { | |
454 | sp->hdr.flags &= ~RXRPC_JUMBO_PACKET; | |
455 | ||
456 | /* make a clone to represent the first subpacket in what's left | |
457 | * of the jumbo packet */ | |
458 | part = skb_clone(jumbo, GFP_ATOMIC); | |
459 | if (!part) { | |
460 | /* simply ditch the tail in the event of ENOMEM */ | |
461 | pskb_trim(jumbo, RXRPC_JUMBO_DATALEN); | |
462 | break; | |
463 | } | |
464 | rxrpc_new_skb(part); | |
465 | ||
466 | pskb_trim(part, RXRPC_JUMBO_DATALEN); | |
467 | ||
468 | if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN)) | |
469 | goto protocol_error; | |
470 | ||
471 | if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0) | |
472 | goto protocol_error; | |
473 | if (!pskb_pull(jumbo, sizeof(jhdr))) | |
474 | BUG(); | |
475 | ||
0d12f8a4 DH |
476 | sp->hdr.seq += 1; |
477 | sp->hdr.serial += 1; | |
17926a79 DH |
478 | sp->hdr.flags = jhdr.flags; |
479 | sp->hdr._rsvd = jhdr._rsvd; | |
480 | ||
0d12f8a4 | 481 | _proto("Rx DATA Jumbo %%%u", sp->hdr.serial - 1); |
17926a79 DH |
482 | |
483 | rxrpc_fast_process_packet(call, part); | |
484 | part = NULL; | |
485 | ||
486 | } while (sp->hdr.flags & RXRPC_JUMBO_PACKET); | |
487 | ||
488 | rxrpc_fast_process_packet(call, jumbo); | |
489 | _leave(""); | |
490 | return; | |
491 | ||
492 | protocol_error: | |
493 | _debug("protocol error"); | |
494 | rxrpc_free_skb(part); | |
495 | rxrpc_free_skb(jumbo); | |
496 | write_lock_bh(&call->state_lock); | |
497 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
498 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
dc44b3a0 | 499 | call->local_abort = RX_PROTOCOL_ERROR; |
4c198ad1 | 500 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
651350d1 | 501 | rxrpc_queue_call(call); |
17926a79 DH |
502 | } |
503 | write_unlock_bh(&call->state_lock); | |
504 | _leave(""); | |
505 | } | |
506 | ||
507 | /* | |
508 | * post an incoming packet to the appropriate call/socket to deal with | |
509 | * - must get rid of the sk_buff, either by freeing it or by queuing it | |
510 | */ | |
7727640c | 511 | static void rxrpc_post_packet_to_call(struct rxrpc_call *call, |
17926a79 DH |
512 | struct sk_buff *skb) |
513 | { | |
514 | struct rxrpc_skb_priv *sp; | |
17926a79 | 515 | |
7727640c | 516 | _enter("%p,%p", call, skb); |
17926a79 DH |
517 | |
518 | sp = rxrpc_skb(skb); | |
519 | ||
17926a79 | 520 | _debug("extant call [%d]", call->state); |
17926a79 DH |
521 | |
522 | read_lock(&call->state_lock); | |
523 | switch (call->state) { | |
524 | case RXRPC_CALL_LOCALLY_ABORTED: | |
4c198ad1 | 525 | if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events)) { |
651350d1 | 526 | rxrpc_queue_call(call); |
7727640c TS |
527 | goto free_unlock; |
528 | } | |
17926a79 DH |
529 | case RXRPC_CALL_REMOTELY_ABORTED: |
530 | case RXRPC_CALL_NETWORK_ERROR: | |
531 | case RXRPC_CALL_DEAD: | |
7727640c TS |
532 | goto dead_call; |
533 | case RXRPC_CALL_COMPLETE: | |
534 | case RXRPC_CALL_CLIENT_FINAL_ACK: | |
535 | /* complete server call */ | |
19ffa01c | 536 | if (rxrpc_conn_is_service(call->conn)) |
7727640c TS |
537 | goto dead_call; |
538 | /* resend last packet of a completed call */ | |
539 | _debug("final ack again"); | |
540 | rxrpc_get_call(call); | |
4c198ad1 | 541 | set_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events); |
7727640c | 542 | rxrpc_queue_call(call); |
17926a79 DH |
543 | goto free_unlock; |
544 | default: | |
545 | break; | |
546 | } | |
547 | ||
548 | read_unlock(&call->state_lock); | |
549 | rxrpc_get_call(call); | |
17926a79 DH |
550 | |
551 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
552 | sp->hdr.flags & RXRPC_JUMBO_PACKET) | |
553 | rxrpc_process_jumbo_packet(call, skb); | |
554 | else | |
555 | rxrpc_fast_process_packet(call, skb); | |
556 | ||
557 | rxrpc_put_call(call); | |
558 | goto done; | |
559 | ||
17926a79 | 560 | dead_call: |
b6f3a40c TS |
561 | if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) { |
562 | skb->priority = RX_CALL_DEAD; | |
85f32278 | 563 | rxrpc_reject_packet(call->conn->params.local, skb); |
7727640c | 564 | goto unlock; |
17926a79 | 565 | } |
17926a79 | 566 | free_unlock: |
17926a79 | 567 | rxrpc_free_skb(skb); |
7727640c TS |
568 | unlock: |
569 | read_unlock(&call->state_lock); | |
17926a79 DH |
570 | done: |
571 | _leave(""); | |
572 | } | |
573 | ||
574 | /* | |
575 | * post connection-level events to the connection | |
576 | * - this includes challenges, responses and some aborts | |
577 | */ | |
578 | static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, | |
579 | struct sk_buff *skb) | |
580 | { | |
581 | _enter("%p,%p", conn, skb); | |
582 | ||
583 | atomic_inc(&conn->usage); | |
584 | skb_queue_tail(&conn->rx_queue, skb); | |
651350d1 | 585 | rxrpc_queue_conn(conn); |
17926a79 DH |
586 | } |
587 | ||
44ba0698 DH |
588 | /* |
589 | * post endpoint-level events to the local endpoint | |
590 | * - this includes debug and version messages | |
591 | */ | |
592 | static void rxrpc_post_packet_to_local(struct rxrpc_local *local, | |
593 | struct sk_buff *skb) | |
594 | { | |
595 | _enter("%p,%p", local, skb); | |
596 | ||
44ba0698 | 597 | skb_queue_tail(&local->event_queue, skb); |
4f95dd78 | 598 | rxrpc_queue_work(&local->processor); |
44ba0698 DH |
599 | } |
600 | ||
0d12f8a4 DH |
601 | /* |
602 | * Extract the wire header from a packet and translate the byte order. | |
603 | */ | |
604 | static noinline | |
605 | int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb) | |
606 | { | |
607 | struct rxrpc_wire_header whdr; | |
608 | ||
609 | /* dig out the RxRPC connection details */ | |
4d0fc73e | 610 | if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) |
0d12f8a4 | 611 | return -EBADMSG; |
4d0fc73e | 612 | if (!pskb_pull(skb, sizeof(whdr))) |
0d12f8a4 DH |
613 | BUG(); |
614 | ||
615 | memset(sp, 0, sizeof(*sp)); | |
616 | sp->hdr.epoch = ntohl(whdr.epoch); | |
617 | sp->hdr.cid = ntohl(whdr.cid); | |
618 | sp->hdr.callNumber = ntohl(whdr.callNumber); | |
619 | sp->hdr.seq = ntohl(whdr.seq); | |
620 | sp->hdr.serial = ntohl(whdr.serial); | |
621 | sp->hdr.flags = whdr.flags; | |
622 | sp->hdr.type = whdr.type; | |
623 | sp->hdr.userStatus = whdr.userStatus; | |
624 | sp->hdr.securityIndex = whdr.securityIndex; | |
625 | sp->hdr._rsvd = ntohs(whdr._rsvd); | |
626 | sp->hdr.serviceId = ntohs(whdr.serviceId); | |
627 | return 0; | |
628 | } | |
629 | ||
7727640c | 630 | static struct rxrpc_connection *rxrpc_conn_from_local(struct rxrpc_local *local, |
42886ffe | 631 | struct sk_buff *skb) |
7727640c TS |
632 | { |
633 | struct rxrpc_peer *peer; | |
634 | struct rxrpc_transport *trans; | |
635 | struct rxrpc_connection *conn; | |
be6e6707 | 636 | struct sockaddr_rxrpc srx; |
7727640c | 637 | |
be6e6707 DH |
638 | rxrpc_get_addr_from_skb(local, skb, &srx); |
639 | rcu_read_lock(); | |
640 | peer = rxrpc_lookup_peer_rcu(local, &srx); | |
0e4699e4 | 641 | if (!peer) |
be6e6707 | 642 | goto cant_find_peer; |
7727640c TS |
643 | |
644 | trans = rxrpc_find_transport(local, peer); | |
be6e6707 | 645 | rcu_read_unlock(); |
7727640c TS |
646 | if (!trans) |
647 | goto cant_find_conn; | |
648 | ||
42886ffe | 649 | conn = rxrpc_find_connection(trans, skb); |
7727640c TS |
650 | rxrpc_put_transport(trans); |
651 | if (!conn) | |
652 | goto cant_find_conn; | |
653 | ||
654 | return conn; | |
be6e6707 DH |
655 | |
656 | cant_find_peer: | |
657 | rcu_read_unlock(); | |
7727640c TS |
658 | cant_find_conn: |
659 | return NULL; | |
660 | } | |
661 | ||
17926a79 DH |
662 | /* |
663 | * handle data received on the local endpoint | |
664 | * - may be called in interrupt context | |
4f95dd78 DH |
665 | * |
666 | * The socket is locked by the caller and this prevents the socket from being | |
667 | * shut down and the local endpoint from going away, thus sk_user_data will not | |
668 | * be cleared until this function returns. | |
17926a79 | 669 | */ |
676d2369 | 670 | void rxrpc_data_ready(struct sock *sk) |
17926a79 | 671 | { |
17926a79 | 672 | struct rxrpc_skb_priv *sp; |
4f95dd78 | 673 | struct rxrpc_local *local = sk->sk_user_data; |
17926a79 DH |
674 | struct sk_buff *skb; |
675 | int ret; | |
676 | ||
676d2369 | 677 | _enter("%p", sk); |
17926a79 DH |
678 | |
679 | ASSERT(!irqs_disabled()); | |
680 | ||
17926a79 DH |
681 | skb = skb_recv_datagram(sk, 0, 1, &ret); |
682 | if (!skb) { | |
17926a79 DH |
683 | if (ret == -EAGAIN) |
684 | return; | |
685 | _debug("UDP socket error %d", ret); | |
686 | return; | |
687 | } | |
688 | ||
689 | rxrpc_new_skb(skb); | |
690 | ||
691 | _net("recv skb %p", skb); | |
692 | ||
693 | /* we'll probably need to checksum it (didn't call sock_recvmsg) */ | |
694 | if (skb_checksum_complete(skb)) { | |
695 | rxrpc_free_skb(skb); | |
02c22347 | 696 | __UDP_INC_STATS(&init_net, UDP_MIB_INERRORS, 0); |
17926a79 DH |
697 | _leave(" [CSUM failed]"); |
698 | return; | |
699 | } | |
700 | ||
02c22347 | 701 | __UDP_INC_STATS(&init_net, UDP_MIB_INDATAGRAMS, 0); |
1781f7f5 | 702 | |
0d12f8a4 DH |
703 | /* The socket buffer we have is owned by UDP, with UDP's data all over |
704 | * it, but we really want our own data there. | |
705 | */ | |
17926a79 DH |
706 | skb_orphan(skb); |
707 | sp = rxrpc_skb(skb); | |
17926a79 DH |
708 | |
709 | _net("Rx UDP packet from %08x:%04hu", | |
710 | ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source)); | |
711 | ||
712 | /* dig out the RxRPC connection details */ | |
0d12f8a4 | 713 | if (rxrpc_extract_header(sp, skb) < 0) |
17926a79 | 714 | goto bad_message; |
17926a79 DH |
715 | |
716 | _net("Rx RxRPC %s ep=%x call=%x:%x", | |
717 | sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient", | |
0d12f8a4 | 718 | sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber); |
17926a79 | 719 | |
351c1e64 DH |
720 | if (sp->hdr.type >= RXRPC_N_PACKET_TYPES || |
721 | !((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) { | |
17926a79 DH |
722 | _proto("Rx Bad Packet Type %u", sp->hdr.type); |
723 | goto bad_message; | |
724 | } | |
725 | ||
44ba0698 DH |
726 | if (sp->hdr.type == RXRPC_PACKET_TYPE_VERSION) { |
727 | rxrpc_post_packet_to_local(local, skb); | |
728 | goto out; | |
729 | } | |
bc6e1ea3 | 730 | |
17926a79 DH |
731 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && |
732 | (sp->hdr.callNumber == 0 || sp->hdr.seq == 0)) | |
733 | goto bad_message; | |
734 | ||
7727640c TS |
735 | if (sp->hdr.callNumber == 0) { |
736 | /* This is a connection-level packet. These should be | |
737 | * fairly rare, so the extra overhead of looking them up the | |
738 | * old-fashioned way doesn't really hurt */ | |
739 | struct rxrpc_connection *conn; | |
17926a79 | 740 | |
42886ffe | 741 | conn = rxrpc_conn_from_local(local, skb); |
7727640c TS |
742 | if (!conn) |
743 | goto cant_route_call; | |
17926a79 | 744 | |
7727640c | 745 | _debug("CONN %p {%d}", conn, conn->debug_id); |
17926a79 | 746 | rxrpc_post_packet_to_conn(conn, skb); |
7727640c TS |
747 | rxrpc_put_connection(conn); |
748 | } else { | |
749 | struct rxrpc_call *call; | |
0d12f8a4 DH |
750 | |
751 | call = rxrpc_find_call_hash(&sp->hdr, local, | |
752 | AF_INET, &ip_hdr(skb)->saddr); | |
7727640c TS |
753 | if (call) |
754 | rxrpc_post_packet_to_call(call, skb); | |
755 | else | |
756 | goto cant_route_call; | |
757 | } | |
44ba0698 DH |
758 | |
759 | out: | |
17926a79 DH |
760 | return; |
761 | ||
762 | cant_route_call: | |
763 | _debug("can't route call"); | |
764 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED && | |
765 | sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { | |
0d12f8a4 | 766 | if (sp->hdr.seq == 1) { |
17926a79 DH |
767 | _debug("first packet"); |
768 | skb_queue_tail(&local->accept_queue, skb); | |
4f95dd78 | 769 | rxrpc_queue_work(&local->processor); |
17926a79 DH |
770 | _leave(" [incoming]"); |
771 | return; | |
772 | } | |
773 | skb->priority = RX_INVALID_OPERATION; | |
774 | } else { | |
775 | skb->priority = RX_CALL_DEAD; | |
776 | } | |
777 | ||
b6f3a40c TS |
778 | if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) { |
779 | _debug("reject type %d",sp->hdr.type); | |
780 | rxrpc_reject_packet(local, skb); | |
781 | } | |
17926a79 DH |
782 | _leave(" [no call]"); |
783 | return; | |
784 | ||
785 | bad_message: | |
786 | skb->priority = RX_PROTOCOL_ERROR; | |
787 | rxrpc_reject_packet(local, skb); | |
17926a79 DH |
788 | _leave(" [badmsg]"); |
789 | } |